About EDGAR Online | Login
 
The following is an excerpt from a DEF 14A SEC Filing, filed by SAFECO TAX EXEMPT BOND TRUST on 11/8/2004.
Next Section Next Section Previous Section Previous Section
SAFECO TAX EXEMPT BOND TRUST - DEF 14A - 20041108 - PROPOSAL_1

PROPOSAL 1(a)

Approval of Agreement and Plan of Reorganization

SUMMARY

The following is a summary of more complete information appearing later in this Proxy Statement/Prospectus or incorporated herein. You should read carefully the entire Proxy Statement/Prospectus, including the form of Agreement and Plan of Reorganization attached as EXHIBIT A-2, because it contains details that are not in the summary.

The Investor Class shares to be issued in the Reorganization will convert to Class A shares after two years. Class A shares will have higher expenses per share than Investor Class shares due to the Rule 12b-1 Plan. In addition, although Pioneer has agreed to limit the expenses attributable to Investor Class shares, Pioneer is not required to limit the expenses attributable to Class A shares.

In the table below, if a row extends across the entire table, the policy disclosed applies to both your Safeco Fund and the Pioneer Fund.

Comparison of Safeco California Tax-Free Income Fund to Pioneer California Tax Free Income Fund

------------------------------------------------------------------------------------------------------------------------------------
                            Safeco California Tax-Free Income Fund           Pioneer California Tax Free Income Fund
------------------------------------------------------------------------------------------------------------------------------------
------------------------------------------------------------------------------------------------------------------------------------
 Business                  A series of Safeco Tax-Exempt Bond Trust, a    A newly organized series of Pioneer Series
                           diversified open-end management investment     Trust II, an open-end management investment
                           company organized as a Delaware statutory      company registered under the Investment
                           trust.                                         Company Act and organized as a Delaware
                                                                          statutory trust.
------------------------------------------------------------------------------------------------------------------------------------
 Net assets as of          $82.4 million                                  None. The Pioneer California Tax Free Income
 June 30, 2004                                                            Fund is newly organized and does not expect to
                                                                          commence investment operations until the
                                                                          Reorganization occurs.
------------------------------------------------------------------------------------------------------------------------------------
 Investment advisers and   Investment adviser (until August 2, 2004):     Investment adviser:
 portfolio managers        SAM                                            Pioneer

                           Portfolio Managers (until August 2, 2004):     Portfolio Managers:
                           Stephen C. Bauer (since 1983)                  Day-to-day management of the Fund's
                           President and Director, SAM                    portfolio will be the responsibility of a team of
                                                                          fixed income portfolio managers led by
                           Mary Metastasio (since 2003)                   Kenneth J. Taubes.
                           Vice President, SAM
                                                                          Mr. Taubes joined Pioneer as a senior vice
                           Currently Pioneer is investment adviser to     president in September 1998 and has been an
                           Safeco California Tax-Free Income Fund. The    investment professional since 1982.
                           Portfolio Managers of Pioneer California Tax
                           Fund, as indicated in the next column,
                           currently manage your Safeco Fund.
------------------------------------------------------------------------------------------------------------------------------------
 Investment objective      Each Fund seeks to provide as high a level of current interest income exempt from federal income
                           tax and California state personal income tax as is consistent with the relative stability of
                           capital.
------------------------------------------------------------------------------------------------------------------------------------

8

------------------------------------------------------------------------------------------------------------------------------------
                             Safeco California Tax-Free Income Fund             Pioneer California Tax Free Income Fund
------------------------------------------------------------------------------------------------------------------------------------
 Primary investments     To achieve its investment objective, each Fund invests primarily in investment-grade municipal
                         bonds issued by the state of California or its political subdivisions and having average maturities
                         of 15 years or longer. Under normal circumstances, each Fund invests:

                         o At least 80% of its assets in securities the interest on which is exempt from federal income tax
                           and California personal income tax
                         o At least 65% of its assets in investment-grade municipal bonds with a maturity of more than
                           one year
------------------------------------------------------------------------------------------------------------------------------------
                                                                            Pioneer California Tax Free Income Fund's
                                                                            investments may have fixed or variable
                                                                            principal payments and all types of interest
                                                                            rate payment and reset terms, including
                                                                            fixed and floating rates, inverse floating
                                                                            rate, zero coupon, contingent, deferred and
                                                                            payment in kind and auction rate features.

                                                                            Pioneer California Tax Free Income Fund
                                                                            may invest in tax-exempt securities of
                                                                            issuers located outside the state of
                                                                            California. The Fund will not invest in
                                                                            securities the interest on which is a tax
                                                                            preference item for purposes of the federal
                                                                            alternative minimum tax.

                                                                            Pioneer California Tax Free Income Fund
                                                                            may invest in municipal securities of any
                                                                            maturity, although under normal
                                                                            circumstances it is anticipated that the Fund
                                                                            will generally invest in longer-term
                                                                            investments. Municipal securities with
                                                                            longer maturities are generally more volatile
                                                                            than other fixed income securities with
                                                                            shorter maturities.
------------------------------------------------------------------------------------------------------------------------------------
 Investment strategies   When evaluating a bond to buy, SAM                 Pioneer considers both broad economic
                         considered among other things:                     factors and issuer specific factors in selecting
                                                                            a portfolio designed to achieve the Fund's
                         o Yield                                            investment objective. In assessing the
                         o Maturity                                         appropriate maturity and rating weighting of
                         o Structural features such as an issuer's right    the Fund's portfolio, Pioneer considers a
                           to buy the bond back at a stated price (a        variety of factors that are expected to
                           "call") or the Fund's right to require the       influence economic activity and interest rates.
                           issuer to buy the bond back at a stated price    These factors include fundamental economic
                           (a "put")                                        indicators, such as the rates of economic
                         o Credit quality (including the underlying rating  growth and inflation, Federal Reserve
                           of insured bonds)                                monetary policy and the relative value of the
                         o The project the issuer is financing              U.S. dollar compared to other currencies.
                         o The original offering price
                         o The amount of discount off or premium on         Once Pioneer determines the preferable portfolio
                           the stated principal amount of the bond          characteristics, Pioneer selects individual
                           represented by the price offered                 securities based upon the terms of the securities
                         o Whether the bond appears to offer the best       (such as yields compared to U.S. Treasuries or
                           overall value when compared to other             comparable issues), liquidity and rating and
                           available bonds                                  issuer diversification.
------------------------------------------------------------------------------------------------------------------------------------

9

------------------------------------------------------------------------------------------------------------------------------------
                              Safeco California Tax-Free Income Fund              Pioneer California Tax Free Income Fund
------------------------------------------------------------------------------------------------------------------------------------
 Investment strategies
 (continued)              SAM historically favored long-term maturity          Pioneer also employs due diligence and
                          bonds in essential services that offer a             fundamental research, an evaluation of the
                          significant degree of protection against issuer      issuer based on its financial statements and
                          repurchase rights prior to maturity and good         operations, to assess an issuer's credit quality,
                          value relative to their peers. SAM may use the       taking into account financial condition, future
                          rating services provided by Moody's, S&P, or         capital needs and potential for change in
                          Fitch. Bond ratings indicate an issuer's financial   rating. In making these portfolio decisions,
                          strength and ability to meet its debt obligations.   Pioneer relies on the knowledge, experience
                                                                               and judgment of its staff who have access to
                          Safeco California Tax-Free Income Fund sold          a wide variety of research.
                          bonds when:
                          o They become fully valued
                          o More attractively valued bonds become
                          available;
                          o Cash is needed to meet shareholder
                          redemptions

                          Because it often takes years for attractive
                          relative valuations to be recognized by the
                          municipal securities market, turnover of the
                          Fund's portfolio can be low.
------------------------------------------------------------------------------------------------------------------------------------
 Other investments        Safeco California Tax-Free Income Fund will          Pioneer California Tax Free Income Fund may
                          limit its investment in municipal obligations the    invest up to 20% of its net assets in securities
                          interest on which is payable from the revenues       of other investment companies, investment
                          of similar types of projects to less than 25% of     grade commercial paper, U.S. government
                          each Funds' total assets. As a matter of             securities, U.S. or foreign bank instruments and
                          operating policy, "similar types of projects"        repurchase agreements.
                          may include sports, convention or trade show
                          facilities; airports or mass transportation;         Pioneer California Tax Free Income Fund may
                          sewage or solid waste disposal facilities; or air    invest up to 10% of its net assets in debt
                          and water pollution control projects.                securities rated below investment grade or, if
                                                                               unrated, of equivalent quality as determined by
                          Safeco California Tax-Free Income Fund may           Pioneer. Debt securities rated below investment
                          invest in any of the following short-term,           grade are commonly referred to as "junk
                          tax-exempt obligations: municipal notes of           bonds" and are considered speculative. Below
                          issuers rated, at the time of the purchase,          investment grade debt securities involve greater
                          within one of the three highest grades               risk of loss, are subject to greater price
                          assigned by a nationally recognized statistical      volatility and are less liquid, especially during
                          rating organization ("NRSRO"); unrated               periods of economic uncertainty or change,
                          municipal notes offered by issuers having            than higher quality debt securities.
                          outstanding municipal bonds rated within one
                          of the three highest grades assigned by an           Pioneer California Tax Free Income Fund may
                          NRSRO; notes issued by or on behalf of               invest up to 10% of its net assets in inverse
                          municipal issuers that are guaranteed by the         floating rate obligations (a type of derivative
                          U.S. government; tax-exempt commercial paper         instrument). Inverse floating rate obligations
                          assigned one of the two highest grades by an         represent interests in tax-exempt bonds. The
                          NRSRO; certificates of deposit issued by banks       interest rate on inverse floating rate
                          with assets of $1,000,000,000 or more; and           obligations will generally decrease as short-
                          municipal obligations that have a maturity of        term interest rates increase, and increase as
                          one year or less from the date of purchase.          short-term rates decrease. Due to their
------------------------------------------------------------------------------------------------------------------------------------

10

------------------------------------------------------------------------------------------------------------------------------------
                                     Safeco California Tax-Free Income Fund              Pioneer California Tax Free Income Fund
------------------------------------------------------------------------------------------------------------------------------------
 Other investments (continued)   Safeco California Tax-Free Income Fund may           leveraged structure, the sensitivity of the
                                 invest in obligations of the U.S. government,        market value of an inverse floating rate
                                 its agencies or instrumentalities or in qualified    obligation to changes in interest rates is
                                 repurchase agreements, the net interest on           generally greater than a comparable
                                 which is taxable for federal income tax              long-term bond issued by the same
                                 purposes.                                            municipality and with similar credit
                                                                                      quality, redemption and maturity
                                                                                      provisions. Inverse floating rate
                                                                                      obligations may be volatile and involve
                                                                                      leverage risk.
------------------------------------------------------------------------------------------------------------------------------------
 Temporary defensive             Safeco California Tax-Free Income Fund may           Pioneer California Tax Free Income Fund may
 strategies                      hold cash or as a temporary defensive                invest all or part of its assets in
                                 measure when market conditions so warrant.           securities with remaining maturities of
                                                                                      less than one year, cash equivalents or may
                                                                                      hold cash.
------------------------------------------------------------------------------------------------------------------------------------
 Diversification                 Each Fund is diversified for the purpose of the Investment Company Act, and each Fund is
                                 subject to diversification requirements under the Internal Revenue Code of 1986, as amended
                                 ("the Code").
------------------------------------------------------------------------------------------------------------------------------------
 Industry concentration          Each Fund will not make investments that will result in the concentration (as that term may be
                                 defined in the Investment Company Act, any rule or order thereunder, or SEC staff interpretation
                                 thereof) of its investments in the securities of issuers primarily engaged in the same industry,
                                 provided that this restriction does not limit each Fund from investing in obligations issued or
                                 guaranteed by the U.S. government, its agencies or instrumentalities.
------------------------------------------------------------------------------------------------------------------------------------
 Restricted and illiquid         If immediately after and as a result of such         Pioneer California Tax Free Income Fund
 securities                      action the value of the following securities, in     will not invest more than 10% of its net
                                 the aggregate, would exceed 10% of Safeco            assets in illiquid and other securities
                                 California Tax-Free Income Fund's net assets,        that are not readily marketable. Repurchase
                                 the Fund will not (i) purchase securities for        agreements maturing in more than seven days
                                 which there is no readily available market, (ii)     will be included for purposes of the
                                 purchase time deposits maturing in more than         foregoing limit. Securities subject to
                                 seven days, (iii) purchase over-the-counter          restrictions on resale under the 1933 Act,
                                 (OTC) options or hold assets set aside to cover      are considered illiquid unless they are
                                 OTC options written by the Fund, (iv) enter into     eligible for resale pursuant to Rule 144A
                                 repurchase agreements maturing in more than          or another exemption from the registration
                                 seven days, or (v) invest in interests in real       requirements of the 1933 Act and are
                                 estate investment trusts which are not readily       determined to be liquid by Pioneer.
                                 marketable or interests in real estate limited
                                 partnerships which are not listed or traded on
                                 the NASDAQ Stock Market.
------------------------------------------------------------------------------------------------------------------------------------
 Borrowing                       Safeco California Tax-Free Income Fund may           Pioneer California Tax Free Income Fund may
                                 borrow money (i) from banks or (ii) by engaging      not borrow money, except on a temporary
                                 in reverse repurchase agreements.                    basis and to the extent permitted by
                                                                                      applicable law, as amended and interpreted
                                                                                      or modified from time to time by any
                                                                                      regulatory authority having jurisdiction.
                                                                                      Under current regulatory requirements, the
                                                                                      Fund may: (a) borrow from banks or through
                                                                                      reverse repurchase agreements in an amount
                                                                                      up to 33 1/3% of the fund's total assets
                                                                                      (including the amount borrowed); (b) borrow
                                                                                      up to an additional 5%
------------------------------------------------------------------------------------------------------------------------------------

11

------------------------------------------------------------------------------------------------------------------------------------
                                      Safeco California Tax-Free Income Fund                Pioneer California Tax Free Income Fund
------------------------------------------------------------------------------------------------------------------------------------
 Borrowing (continued)                                                                   of the fund's assets for temporary
                                                                                         purposes; (c) obtain such short-term
                                                                                         credits as are necessary for the clearance
                                                                                         of portfolio transactions; (d) purchase
                                                                                         securities on margin to the extent
                                                                                         permitted by applicable law; and (e) engage
                                                                                         in transactions in mortgage dollar rolls
                                                                                         that are accounted for as financings.
------------------------------------------------------------------------------------------------------------------------------------
 Lending                         Safeco California Tax-Free Income Fund may              Pioneer California Tax Free Income Fund may
                                 lend securities to qualified institutional investors    not make loans, except that the Fund may
                                 with a value of up to 33% of the Fund's total           (i) lend portfolio securities in accordance
                                 assets.                                                 with the Fund's investment policies, (ii)
                                                                                         enter into repurchase agreements, (iii)
                                                                                         purchase all or a portion of an issue of
                                                                                         publicly distributed debt securities, bank
                                                                                         loan participation interests, bank
                                                                                         certificates of deposit, bankers'
                                                                                         acceptances, debentures or other
                                                                                         securities, whether or not the purchase is
                                                                                         made upon the original issuance of the
                                                                                         securities, (iv) participate in a credit
                                                                                         facility whereby the Fund may directly lend
                                                                                         to and borrow money from other affiliated
                                                                                         funds to the extent permitted under the
                                                                                         Investment Company Act or an exemption
                                                                                         therefrom, and (v) make loans in any other
                                                                                         manner consistent with applicable law, as
                                                                                         amended and interpreted or modified from
                                                                                         time to time by any regulatory authority
                                                                                         having jurisdiction.
------------------------------------------------------------------------------------------------------------------------------------
 Derivative instruments          Safeco California Tax-Free Income Fund may              Pioneer California Tax Free Income Fund may
                                 not purchase securities on margin. However,             use futures and options on securities,
                                 the Fund may (i) obtain short-term credits as           indices and currencies, forward currency
                                 necessary to clear its purchases and sales of           exchange contracts and other derivatives.
                                 securities, and (ii) make margin deposits in            The Fund does not use derivatives as a
                                 connection with its use of financial options and        primary investment technique and generally
                                 futures, forward and spot currency contracts,           limits their use to hedging. However, the
                                 swap transactions and other financial contracts         Fund may use derivatives for a variety of
                                 or derivative instruments.                              non-principal purposes, including:

                                                                                         o As a hedge against adverse changes in
                                                                                           stock market prices, interest rates or
                                                                                           currency exchange rates
                                                                                         o As a substitute for purchasing or selling
                                                                                           securities
                                                                                         o To increase the Fund's return as a non-
                                                                                           hedging strategy that may be considered
                                                                                           speculative
------------------------------------------------------------------------------------------------------------------------------------
 Other investment policies and   As described above, the Funds have substantially similar principal investment strategies and
 restrictions                    policies. Certain of the non-principal investment policies and restrictions are different. For a
                                 more complete discussion of each Fund's other investment policies and fundamental and non-
                                 fundamental investment restrictions, see the SAI.
------------------------------------------------------------------------------------------------------------------------------------

12

------------------------------------------------------------------------------------------------------------------------------------
                                   Safeco California Tax-Free Income Fund            Pioneer California Tax Free Income Fund
------------------------------------------------------------------------------------------------------------------------------------
                                                               Buying, Sellingand Exchange Shares
------------------------------------------------------------------------------------------------------------------------------------
 Sales charges               Purchases under $1,000,000 of Class A shares      The Investor Class shares of Pioneer California
                             of Safeco California Tax-Free Income Fund are     Tax Free Income Fund you receive in the
                             subject to a 4.50% front-end sales charge.        Reorganization will not be subject to any
                                                                               sales charge. Moreover, if you own shares
                             A contingent deferred sales charge of up to       in your own name as of the closing of the
                             5.00% if you redeem Class B shares within six     Reorganization (i.e., not in the name of a
                             years of purchase.                                broker or other intermediary) or own shares in
                                                                               the name of an omnibus account provider as
                             A contingent deferred sales charge of up to       of the closing of the Reorganization that
                             1.00% if you redeem Class C shares within         agrees with the Pioneer Fund to distinguish
                             one year of purchase.                             beneficial holders in the same manner and
                                                                               maintain your account, you may purchase
                             Purchases of Investor Class shares of the Fund    Class A shares of Pioneer California Tax Free
                             are not subject to a sales load.                  Income Fund and Class A shares of any fund
                                                                               in the Pioneer family of funds through such
                             The Fund assesses a mandatory redemption          account in the future without paying any
                             fee of 2%, as a percentage of the amount          sales charge.
                             redeemed or exchanged, on Class A and
                             Investor Class shares held less than 30 days.     Except as described above, Class A shares of
                                                                               Pioneer California Tax Free Income Fund are
                                                                               subject to a front-end sales charge of up
                                                                               to 4.50%.
------------------------------------------------------------------------------------------------------------------------------------
 Management and other fees   Safeco California Tax-Free Income Fund pays       Pioneer California Tax Free Income Fund will
                             an advisory fee on a monthly basis at an          pay Pioneer an advisory fee as follows: 0.50%
                             annual rate as follows:                           of the fund's average daily net assets on the
                                                                               first $250 million, 0.45% on assets greater
                             $0-$250,000,000:                  0.50 of 1%      than $250 million to $750 million and 0.40%
                             $250,000,001-$750,000,000:        0.45 of 1%      on assets greater than $750 million. The fee is
                             Over $750,000,00:                 0.40 of 1%      computed daily and paid monthly.

                             SAM serves as administrator and fund              In addition, the Fund will reimburse Pioneer for
                             accounting agent for Safeco California Tax-Free   certain fund accounting and legal expenses
                             Income Fund. The Fund pays SAM an                 incurred on behalf of the Fund and pays a
                             administrative services fee of 0.05% of the       separate shareholder servicing/transfer agency
                             Fund's average daily net assets up to the first   fee to Pioneer Investment Management
                             $200,000,000 and 0.01% of its net assets          Shareholder Services, Inc. ("PIMSS"), an
                             thereafter, and an accounting fee of 0.04%        affiliate of Pioneer.
                             of the Fund's average daily net assets up to
                             the first $200,000,000 and 0.01% of its net       Pioneer has agreed until the second anniversary
                             assets thereafter.                                of the closing of the Reorganization to limit the
                                                                               expenses (excluding extraordinary expenses) of
                             During its most recent fiscal year, Safeco        the Investor Class to 0.63% of the average daily
                             California Tax-Free Income Fund paid aggregate    net assets attributable to the Investor Class.
                             advisory and administration fees at an average
                             rate of 0.59% of average daily net assets.        The Investor Class shares to be issued in the
                                                                               Reorganization will convert to Class A shares
                             SAM had contractually agreed until April 30,      after two years. Class A shares will have
                             2009, to pay certain fund operating expenses      higher expenses per share than Investor Class
                             (but not all of the operating expenses of the     shares due to the Rule 12b-1 Plan. In
                             Fund) that exceeded the rate of 0.40% per         addition, although Pioneer has agreed to limit
                             annum of the Fund's average daily net assets.
------------------------------------------------------------------------------------------------------------------------------------

13

------------------------------------------------------------------------------------------------------------------------------------
                                Safeco California Tax-Free Income Fund            Pioneer California Tax Free Income Fund
------------------------------------------------------------------------------------------------------------------------------------
 Management and other fees   This arrangement included all Fund operating      the expenses attributable to Investor Class
 (continued)                 expenses except management fees, Rule 12b-1       shares, Pioneer is not required to limit the
                             fees, brokerage commissions, interest, and        expenses attributable to Class A shares.
                             extraordinary expenses.

                             In 2003, SAM began voluntarily reimbursing the
                             Fund to the extent that its total expenses
                             exceeded the rate of 0.86% per annum of the
                             Fund's average daily net assets for Class A
                             shares, 1.61% per annum for Class B and Class
                             C shares, and 0.63% per annum for Investor
                             Class shares.

                             For the fiscal year ended December 31, 2003,
                             the Fund's annual operating expenses for
                             Class A shares were 1.06%. After giving effect
                             to the voluntary expense reimbursement, the
                             operating expenses for Class A shares
                             were 0.86%.

                             For the fiscal year ended December 31, 2003,
                             the Fund's annual operating expenses for Class
                             B shares were 1.76%. After giving effect to
                             the voluntary expense reimbursement, the
                             operating expenses for Class B shares
                             were 1.61%.

                             For the fiscal year ended December 31, 2003,
                             the Fund's annual operating expenses for Class
                             C shares, after giving effect to the contractual
                             expense reimbursement, were 1.90%, and
                             without giving effect to the expense limitation
                             were 4.09%. After giving effect to the voluntary
                             expense reimbursement, the operating
                             expenses for Class C shares were 1.61%.

                             For the fiscal year ended December 31, 2003,
                             the Fund's annual operating expenses for
                             Investor Class shares were 0.75%. After giving
                             effect to the voluntary expense reimbursement,
                             the operating expenses for Investor Class
                             shares were 0.63%.
------------------------------------------------------------------------------------------------------------------------------------
 Distribution and service    Investor Class shares of the Pioneer Fund are not subject to a Rule 12b-1 fee. Pioneer Investor
 (12b-1) fee                 Class shares will convert into Class A shares after two years. Class A shares of each Fund are
                             subject to a Rule 12b-1 fee equal to 0.25% annually of average daily net assets.
------------------------------------------------------------------------------------------------------------------------------------

14

------------------------------------------------------------------------------------------------------------------------------------
                          Safeco California Tax-Free Income Fund             Pioneer California Tax Free Income Fund
------------------------------------------------------------------------------------------------------------------------------------
 Buying shares        You may buy shares of Safeco California             You may buy shares from any investment firm
                      Tax-Free Income Fund directly through Safeco        that has a sales agreement with PFD, Pioneer
                      Securities, the Fund's principal underwriter or     California Tax Free Income Fund's distributor.
                      through brokers, registered investment              Existing shareholders of Safeco California
                      advisers, banks and other financial institutions    Tax-Free Income Fund who own shares in their
                      that have entered into selling agreements with      own name as of the closing of the
                      the Fund's principal underwriter, as described      Reorganization (i.e., not in the name of a
                      in the Fund's prospectus.                           broker or other intermediary) or own shares in
                                                                          the name of an omnibus account provider as of
                      Certain account transactions may be done            the closing of the Reorganization that agrees
                      by telephone.                                       with the Pioneer Fund to distinguish beneficial
                                                                          holders in the same manner and who maintain
                                                                          their accounts may buy shares of any fund in
                                                                          the Pioneer family of funds through such
                                                                          accounts in the future without paying sales
                                                                          charges.

                                                                          If the account is established in the
                                                                          shareholder's own name, shareholders may
                                                                          also purchase additional shares of Pioneer
                                                                          California Tax Free Income Fund by telephone
                                                                          or online.
------------------------------------------------------------------------------------------------------------------------------------
 Exchange privilege   There are no sales charges on shares you            You may exchange shares of Pioneer
                      acquire through dividend reinvestment or other      California Tax Free Income Fund without
                      fund distributions.                                 incurring any fee on the exchange with the
                                                                          more than 62 other Pioneer Funds. Your
                      Certain account transactions may be done by         exchange would be for Class A shares, which
                      telephone.                                          would be subject to a Rule 12b-1 fee. An
                                                                          exchange generally is treated as a sale and a
                                                                          new purchase of shares for federal income
                                                                          tax purposes.

                                                                          If the account is established in the
                                                                          shareholder's own name, shareholders may
                                                                          also exchange shares of Pioneer California Tax
                                                                          Free Income Fund for shares of other Pioneer
                                                                          Funds by telephone or online.
------------------------------------------------------------------------------------------------------------------------------------
 Selling shares       Investor Class shares will be sold at net asset value per share next calculated after the Fund
                      receives your request in good order.
------------------------------------------------------------------------------------------------------------------------------------
                      You may sell your shares by contacting Safeco       Normally, your investment firm will send your
                      California Tax-Free Income Fund directly in         request to sell shares to PIMSS. You can also
                      writing or by contacting a financial intermediary   sell your shares by contacting the Fund directly
                      as described in the Fund's prospectus.              if your account is registered in your name.
                                                                          If the account is established in the shareholder's
                                                                          own name, shareholders may also redeem
                                                                          shares of Pioneer California Tax Free Income
                                                                          Fund by telephone or online.
------------------------------------------------------------------------------------------------------------------------------------

15

Comparison of Principal Risks of Investing in the Funds

Because each Fund has a similar investment objective, primary investment policies and strategies, the Funds are subject to the same principal risks. You could lose money on your investment or not make as much as if you invested elsewhere if:

o Interest rates go up, causing the value of the Fund's investments to decline

o The issuer of a security owned by the Fund defaults on its obligation to pay principal and/or interest or has its credit rating downgraded

o New federal or state legislation adversely affects the tax-exempt status of securities held by either Fund or the financial ability of municipalities to repay these obligations

o The issuer of a security owned by either Fund may not be able to make timely payments because of a general economic downturn or increased governmental costs

o Because the Funds concentrate their investments in a single state, there may be more fluctuation in the value of its securities than is the case for mutual funds whose portfolios are more geographically diverse.

o Because both Funds invest primarily in securities issued by California and its municipalities, they are more vulnerable to unfavorable developments in California than are funds that invest in municipal securities of many states. Unfavorable developments in any economic sector may adversely affect the overall California municipal market

o The investment adviser's judgment about the credit quality, attractiveness or relative value of a particular security proves to be incorrect

The Investor Class shares to be issued in the Reorganization will convert to Class A shares after two years. Class A shares will have higher expenses per share than Investor Class shares due to the Rule 12b-1 Plan. In addition, although Pioneer has agreed to limit the expenses attributable to Investor Class shares, Pioneer is not required to limit the expenses attributable to Class A shares.

Investing in mutual fund shares is not the same as making a bank deposit. Your investment is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in either Fund.

Past Performance

Set forth below is performance information for Safeco California Tax-Free Income Fund. The bar charts show how Safeco California Tax-Free Income Fund's total return (not including any deduction for sales charges) has varied from year to year for each full calendar year. The tables show average annual total return (before and after taxes) for Safeco California Tax-Free Income Fund over time for each class of shares (including deductions for sales charges, if applicable) compared with a broad-based securities market index. The bar chart gives an indication of the risks of investing in Safeco California Tax-Free Income Fund, including the fact that you could incur a loss and experience volatility of returns year to year. Past performance before and after taxes does not indicate future results. Because Pioneer California Tax Free Income Fund is a newly organized mutual fund, it has no past performance.

Safeco California Tax-Free Income Fund -- Investor Class Calendar Year Total Returns*

[TABULAR REPRESENTATION OF BAR CHART]

'94               -9.20
'95               26.14
'96                2.53
'97               11.55
'98                6.19
'99               -9.18
'00               18.79
'01                4.12
'02                8.76
'03                4.97

* During the period shown in the bar chart, Safeco California Tax-Free Income Fund's highest quarterly return was 10.59% for the quarter ended March 31, 1995, and the lowest quarterly return was -6.16% for the quarter ended March 31, 1994.

16

Safeco California Tax-Free Income Fund Average Annual Total Returns as of December 31, 2003

----------------------------------------------------------------------------------------------------
                                                                    1 Year      5 Years     10 Years
----------------------------------------------------------------------------------------------------
 Safeco California Tax-Free Income Fund, Class A shares
----------------------------------------------------------------------------------------------------
 Return Before Taxes                                                  0.05%       3.84%       5.25%
----------------------------------------------------------------------------------------------------
 Return After Taxes on Distributions(1)                              -0.01%       3.74%       5.07%
----------------------------------------------------------------------------------------------------
 Return After Taxes on Distributions and Sale of Fund Shares(1)       1.51%       3.85%       5.07%
----------------------------------------------------------------------------------------------------
 Safeco California Tax-Free Income Fund, Class B shares
----------------------------------------------------------------------------------------------------
 Return Before Taxes                                                 -1.04%       3.68%       5.26%
----------------------------------------------------------------------------------------------------
 Safeco California Tax-Free Income Fund, Class C shares
----------------------------------------------------------------------------------------------------
 Return Before Taxes                                                  2.97%       4.02%       5.16%
----------------------------------------------------------------------------------------------------
 Safeco California Tax-Free Income Fund, Investor Class shares
----------------------------------------------------------------------------------------------------
 Return Before Taxes                                                  4.97%       5.10%       5.96%
----------------------------------------------------------------------------------------------------
 Return After Taxes on Distributions(1)                               4.91%       5.00%       5.78%
----------------------------------------------------------------------------------------------------
 Return After Taxes on Distributions and Sale of Fund Shares(1)       4.87%       4.99%       5.74%
----------------------------------------------------------------------------------------------------
 Lehman Brothers Long Municipal Bond Index(2)
  (reflects no deduction for fees, taxes or expenses)                 6.13%       5.95%       6.40%
----------------------------------------------------------------------------------------------------

(1) After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your situation and may differ from those shown.

(2) The Lehman Brothers Long Municipal Bond Index, an unmanaged index of bonds with a minimum credit rating of BAA3, issued as part of a deal of at least $50 million, having an amount of at least $5 million and maturing in 22 or more years, is for reference only, is not limited to California issuers and does not mirror the Fund's investments.

The most recent portfolio manager's discussion of the Safeco Fund's performance is attached as Exhibit D.

The Funds' Fees and Expenses

Shareholders of both Funds pay various fees and expenses, either directly or indirectly. The tables below show the fees and expenses that you would pay if you were to buy and hold shares of each Fund. The expenses in the tables appearing below are based on (i) for Safeco California Tax-Free Income Fund, the expenses of Safeco California Tax-Free Income Fund for the period ended December 31, 2003 and (ii) for Pioneer California Tax Free Income Fund, estimated expenses of Pioneer California Tax Free Income Fund. Future expenses for all share classes may be greater or less.

                                                                                                                      Pro Forma
                                                                                                          Safeco       Pioneer
                                                                Safeco        Safeco        Safeco      California   California
                                                              California    California    California     Tax-Free     Tax Free
                                                               Tax-Free      Tax-Free      Tax-Free    Income Fund   Income Fund
                                                             Income Fund   Income Fund   Income Fund     Investor     Investor
Shareholder transaction fees                                   Class A       Class B       Class C        Class       Class(9)
(paid directly from your investment)                        ------------- ------------- ------------- ------------- ------------
Maximum sales charge (load) when you buy shares
 as a percentage of offering price ........................       4.50%(6)      None          None          None        None(1)
Maximum deferred sales charge (load) as a percentage
 of purchase price or the amount you receive when you sell
 shares, whichever is less ................................       None          5.00%(7)      1.00%(8)      None        None
Redemption fees for shares held less than 30 days .........       2.00%         None          None          2.00%        N/A
Wire redemption fee .......................................      $ 204         $ 204         $ 204         $ 204       $  10
Annual low balance fee ....................................      $ 125         $ 125         $ 125         $ 125         N/A

17

                                                                                                            Pro Forma
                                                                                                Safeco       Pioneer
                                                      Safeco        Safeco        Safeco      California   California
                                                    California    California    California     Tax-Free     Tax Free
                                                     Tax-Free      Tax-Free      Tax-Free    Income Fund   Income Fund
                                                   Income Fund   Income Fund   Income Fund     Investor     Investor
Shareholder transaction fees                         Class A       Class B       Class C        Class       Class(9)
(paid directly from your investment)              ------------- ------------- ------------- ------------- ------------
Annual fund operating expenses (deducted from
 fund assets) (as a % of average net assets)
Management fee ..................................      0.50%         0.50%         0.50%        0.50%         0.50%
Distribution and service (12b-1) fee ............      0.25%         1.00%         1.00%        None           None
Other expenses ..................................      0.31%         0.26%         2.59%        0.25%         0.26%
Total fund operating expenses ...................      1.06%         1.76%         4.09%        0.75%         0.76%
Expense reimbursement / reduction ...............      None(2)       None(2)       2.19%(2)     None(2)       0.13%(3)
Net fund operating expenses .....................      1.06%         1.76%         1.90%        0.75%         0.63%


(1) No sales load will apply to shares received in the Reorganization by shareholders of your Safeco Fund who become shareholders of record of Pioneer California Tax Free Income Fund through the Reorganization. In addition, shareholders of your Safeco Fund who own shares in their own name as of the closing of the Reorganization (i.e., not in the name of a broker or other intermediary) or own shares in the name of an omnibus account provider that agrees with the Pioneer Fund to distinguish beneficial holders in the same manner and who maintain their accounts may purchase Class A shares of Pioneer California Tax Free Income Fund or of any fund in the Pioneer family of funds through such account in the future without paying this sales charge.

(2) As described above, SAM had contractually agreed to reimburse Safeco California Tax-Free Income Fund for certain fund operating expenses (but not all of the operating expenses of the Fund) that exceeded the rate of 0.40% per annum of the Fund's average daily net assets. This arrangement included all fund operating expenses except management fees, Rule 12b-1 fees, brokerage commissions, interest, and extraordinary expenses. In 2003, SAM began voluntarily reimbursing the Fund to the extent that its total expenses exceeded the rate of 0.86% per annum of the Fund's average daily net assets for Class A shares, 1.61% per annum for Class B and Class C shares, and 0.63% per annum for Investor Class shares. The above table reflects "contractual" expense reimbursements from SAM, if any, but does not reflect "voluntary" expense reimbursements by SAM.

(3) Pioneer has agreed that through the second anniversary of the closing of the Reorganization, Pioneer will limit the expenses (excluding extraordinary expenses) of the Investor Class shares of Pioneer California Tax Free Income Fund to 0.63% of average daily net assets.

(4) There is a higher charge for international wire redemptions, which may vary by country or dollar amount.

(5) A low balance fee is charged once each year in December for accounts with balances under $1,000 in your Safeco Fund.

(6) Purchases of $1,000,000 or more of Class A shares of your Safeco Fund are not subject to a front-end sales charge, but a 1.00% deferred sales charge will apply to redemptions made in the first twelve months.

(7) The contingent deferred sales charge on Class B shares of your Safeco Fund reduces to zero after six years from purchase, and the Class B shares convert to Class A shares at that time.

(8) The contingent deferred sales charge on Class C shares applies only to redemptions made in the first twelve months after purchase.

(9) The Investor Class shares to be issued in the Reorganization will convert to Class A shares after two years. Class A shares will have higher expenses per share than Investor Class shares due to the Rule 12b-1 Plan. In addition, although Pioneer has agreed to limit the expenses attributable to Investor Class shares, Pioneer is not required to limit the expenses attributable to Class A shares.

The hypothetical example below helps you compare the cost of investing in each Fund. It assumes that: (a) you invest $10,000 in each Fund for the time periods shown, (b) you reinvest all dividends and distributions, (c) your investment has a 5% return each year, (d) each Fund's gross operating expenses remain the same, (e) the expense limitations are in effect for five years for Safeco California Tax-Free Income Fund and two years for Pioneer California Tax Free Income Fund and (f) and the Investor Class shares of Pioneer California Tax-Free Income Fund convert to Class A shares after two years. The examples are for comparison purposes only and are not a representation of either Fund's actual expenses or returns, either past or future.

18

Example
Safeco California Tax-Free Income Fund

Class A shares
Year 1 ......................                 $  553
Year 3 ......................                 $  772
Year 5 ......................                 $1,008
Year 10 .....................                 $1,686

Class B shares                  With redemption      Without redemption
Year 1 ......................      $  679               $  179
Year 3 ......................      $  854               $  554
Year 5 ......................      $1,154               $  954
Year 10 .....................      $1,719               $1,719

Class C shares                  With redemption      Without redemption
Year 1 ......................      $  293               $  193
Year 3 ......................      $  597               $  597
Year 5 ......................      $1,026               $1,026
Year 10 .....................      $2,306               $2,306

Investor Class shares
Year 1 ......................                 $   77
Year 3 ......................                 $  240
Year 5 ......................                 $  417
Year 10 .....................                 $  930

Pro Forma Pioneer California Tax Free Income Fund

Investor Class shares
Year 1 ......................                 $   64
Year 3 ......................                 $  265
Year 5 ......................                 $  547
Year 10 .....................                 $1,350

Reasons for the Proposed Reorganization

The Trustees believe that the proposed Reorganization is in the best interests of Safeco California Tax-Free Income Fund. The Trustees considered the following matters, among others, in approving the proposal.

First, SAM, the investment adviser to the Fund until August 2, 2004, was acquired by Symetra. Symetra informed the Trustees that it did not intend to continue to provide investment advisory services to the Safeco Funds. Consequently, a change in your Safeco Fund's investment adviser was necessary.

Second, the resources of Pioneer. At June 30, 2004, Pioneer managed over 62 investment companies and accounts with approximately $35 billion in assets. Pioneer is part of the global asset management group of UniCredito Italiano S.p.A., one of the largest banking groups in Italy, providing investment management and financial services to mutual funds, institutional and other clients. As of June 30, 2004, assets under management of UniCredito Italiano S.p.A. were approximately $151 billion worldwide. Shareholders of your Safeco Fund would become part of a significantly larger family of funds that offers a more diverse array of investment options and enhanced shareholder account options. The Pioneer family of mutual funds offers over 62 funds, including domestic and international equity and fixed income funds and a money market fund that will be available to your Safeco Fund's shareholders through exchanges. In addition, Pioneer offers shareholders additional options for their accounts, including the ability to transact and exchange shares over the telephone or online and the ability to access account values and transaction history in all of the shareholder's direct accounts in the Pioneer Funds over the telephone or online.

Third, Pioneer's commitment until the second anniversary of the Reorganization to limit the expenses (excluding extraordinary expenses) of the Investor Class of Pioneer California Tax Free Income Fund to 0.63% of average daily net assets. This expense ratio is lower than both the gross expenses and expenses net of expense reimbursement of the Class A shares and lower than the net expenses of Investor Class shares of your Safeco Fund. Although you will experience higher expenses once the Investor Class shares convert to Class A shares after two years, your expenses will remain the same until the second anniversary of the Reorganization.

Fourth, shareholders who own shares in their name as of the closing of the Reorganization (i.e., not in the name of a broker or other intermediary) and maintain their account may purchase additional Class A shares of the corresponding Pioneer Fund through such account

19

in the future or may exchange those shares for Class A shares of another Pioneer Fund or purchase Class A share of another Pioneer Fund without paying any sales charge.

Fifth, the Investor Class shares of Pioneer California Tax Free Income Fund received in the Reorganization will provide Safeco California Tax-Free Income Fund shareholders with exposure to substantially the same investment product as they currently have.

Pioneer and Symetra will pay all out of pocket expenses of the Safeco Funds and the Pioneer Funds associated with the Reorganizations, including, but not limited to: (1) the expenses associated with the preparation, printing and mailing of any shareholder communications, including this joint Proxy Statement/Prospectus, and any filings with the SEC and other governmental authorities in connection with the Reorganizations; (2) the fees and expenses of any proxy solicitation firm retained in connection with the Reorganizations;
(3) the legal fees and expenses incurred by the Safeco Funds in connection with the Reorganizations; and (4) the Trustees' fees and out of pocket expenses incurred as a result of the Reorganizations.

The Trustees also considered that Pioneer and Symetra will benefit from the Reorganization. See "Will Pioneer and Symetra Benefit from the Reorganizations."

The Board of Trustees of Pioneer California Tax Free Income Fund also considered that the Reorganization presents an excellent opportunity for the Pioneer California Tax Free Income Fund to acquire investment assets without the obligation to pay commissions or other transaction costs that a fund normally incurs when purchasing securities. This opportunity provides an economic benefit to Pioneer California Tax Free Income Fund.

CAPITALIZATION

The following table sets forth the capitalization of each Fund, as of September 30, 2004, and the pro forma capitalization of the combined Fund as of September 30, 2004.

                                                                                      Pro Forma
                                          Safeco                 Pioneer               Pioneer
                                        California             California             California
                                         Tax-Free               Tax Free               Tax Free
                                        Income Fund            Income Fund           Income Fund
                                    September 30, 2004     September 30, 2004     September 30, 2004
                                   --------------------   --------------------   -------------------
Total Net Assets (in thousands)            $99,315             N/A                      $99,315
 Class A shares ................           $ 1,159             N/A                          N/A
 Class B shares ................           $   495             N/A                          N/A
 Class C shares ................           $   101             N/A                          N/A
 Investor Class shares .........           $97,561             N/A                      $99,315

Net Asset Value Per Share
 Class A shares ................           $ 12.72             N/A                          N/A
 Class B shares ................           $ 12.69             N/A                          N/A
 Class C shares ................           $ 12.69             N/A                          N/A
 Investor Class shares .........           $ 12.71             N/A                      $ 12.71

Shares Outstanding
 Class A shares ................            91,125             N/A                          N/A
 Class B shares ................            38,970             N/A                          N/A
 Class C shares ................             7,980             N/A                          N/A
 Investor Class shares .........         7,677,020             N/A                    7,813,926

It is impossible to predict how many shares of Pioneer California Tax Free Income Fund will actually be received and distributed by your Safeco Fund on the Reorganization date. The table should not be relied upon to determine the amount of Pioneer California Tax-Free Income Fund's shares that will actually be received and distributed.

BOARD'S EVALUATION AND RECOMMENDATION

For the reasons described above, the Trustees, including the Independent Trustees, approved the Reorganization. In particular, the Trustees determined that the Reorganization is in the best interests of your Safeco Fund. Similarly, the Board of Trustees of Pioneer California Tax Free Income Fund, including its Independent Trustees, approved the Reorganization. They also determined that the Reorganization is in the best interests of Pioneer California Tax Free Income Fund.

The Trustees recommend that the shareholders of your Safeco Fund vote FOR the proposal to approve the Agreement and Plan of Reorganization.

20

Safeco High-Yield Bond Fund and Pioneer High Yield Fund

PROPOSAL 1(b)

Approval of Agreement and Plan of Reorganization

SUMMARY

The following is a summary of more complete information appearing later in this Proxy Statement/Prospectus or incorporated herein. You should read carefully the entire Proxy Statement/Prospectus, including the form of Agreement and Plan of Reorganization attached as EXHIBIT A-1, because it contains details that are not in the summary.

The Investor Class shares to be issued in the Reorganization will convert to Class A shares after two years. Class A shares will have a higher expenses per share than Investor Class shares due to the Rule 12b-1 Plan. In addition, although Pioneer has agreed to limit the expenses attributable to Investor Class shares, Pioneer is not required to limit the expenses attributable to Class A shares.

In the table below, if a row extends across the entire table, the policy disclosed applies to both your Safeco Fund and the Pioneer Fund.

Comparison of Safeco High-Yield Bond Fund to Pioneer High Yield Fund

------------------------------------------------------------------------------------------------------------------------------------
                                       Safeco High-Yield Bond Fund                        Pioneer High Yield Fund
------------------------------------------------------------------------------------------------------------------------------------
 Business                  A series of Safeco Taxable Bond Trust, a           A diversified open-end management
                           diversified open-end management investment         investment company registered under the
                           company organized as a Delaware statutory          Investment Company Act and organized as a
                           trust.                                             Delaware statutory trust.
------------------------------------------------------------------------------------------------------------------------------------
 Net assets as of          $38 million                                        $7,665 million
 June 30, 2004
------------------------------------------------------------------------------------------------------------------------------------
 Investment advisers and   Investment adviser (until August 2, 2004):         Investment adviser:
 portfolio managers        SAM                                                Pioneer

                           Portfolio Managers:                                Portfolio Managers:
                           Greg Card (since 2001 and until August 2,          Margaret D. Patel (since inception)
                           2004)                                              Joined Pioneer in 1999
                           Assistant Vice President, SAM                      Investment professional for over 25 years
                           Joined SAM in 2001

                           Beverly Denny (since July 2003)
                           Assistant Vice President, SAM
                           Associated with SAM since 1991

                           Currently Pioneer is acting as investment
                           adviser to Safeco High-Yield Bond Fund. The
                           Portfolio Manager of Pioneer High Yield Fund,
                           as indicated in the next column, currently
                           manages your Safeco Fund.
------------------------------------------------------------------------------------------------------------------------------------
 Investment objective      Safeco High-Yield Bond Fund seeks to provide       Pioneer High Yield Fund seeks to maximize
                           a high level of current interest income through    total return through a combination of income
                           the purchase of high-yield debt securities.        and capital appreciation.
------------------------------------------------------------------------------------------------------------------------------------

21

------------------------------------------------------------------------------------------------------------------------------------
                                      Safeco High-Yield Bond Fund                           Pioneer High Yield Fund
------------------------------------------------------------------------------------------------------------------------------------
 Primary investments     Under normal market conditions, Safeco               Under normal market conditions, the Fund
                         High-Yield Bond Fund invests at least 80% of         invests at least 80% of net assets (plus any
                         net assets (plus any borrowings for investment       borrowings for investment purposes) in below
                         purposes) in high-yield debt securities.             investment grade (high yield) debt securities
                                                                              and preferred stocks.
------------------------------------------------------------------------------------------------------------------------------------
 Investment strategies   Safeco High-Yield Bond Fund uses a "value"           Pioneer High Yield Fund uses a "value" style
                         style of management and seeks to invest in an        of management and seeks securities selling at
                         issuer that is a good value relative to its peers.   reasonable prices or substantial discounts to
                         SAM historically evaluated an issuer's               their underlying values and then holds these
                         creditworthiness, liquidity and prospects for        securities for their incremental yields or until
                         growing earnings and cash flow.                      the market values reflect their intrinsic values.
------------------------------------------------------------------------------------------------------------------------------------
 Other investments       Safeco High-Yield Bond Fund may invest up to         Pioneer High Yield Fund's investments may
                         20% of its assets in unrated securities. In          have fixed or variable principal payments and
                         addition, the Fund may invest up to 5% of its        all types of interest rate and dividend payment
                         total assets in securities which are in default.     and reset terms, including fixed rate, adjustable
                                                                              rate, zero coupon, contingent, deferred,
                         Safeco High-Yield Bond Fund may invest in            payment in kind and auction rate features. The
                         restricted securities that are exempt from           Fund invests in securities with a broad range of
                         registration requirements and eligible for resale    maturities.
                         to qualified institutional investors under Rule
                         144A or Section 4(2).                                Pioneer High Yield Fund may invest in
                                                                              mortgage-backed and asset-backed securities.
                         Safeco High-Yield Bond Fund may invest in            To the extent the Fund invests significantly in
                         Yankee sector debt securities. Yankee debt           asset-backed and mortgage-related securities,
                         securities are securities issued in the U.S.         its exposure to prepayment and extension
                         by foreign issuers. These bonds involve              risks may be greater than if it invested in
                         investment risks that are different from those       other fixed income securities.
                         of domestic issuers.
                                                                              Pioneer High Yield Fund may invest in
                         Safeco High-Yield Bond Fund may invest in            mortgage derivatives and structured securities.
                         securities that are direct obligations of the U.S.   Mortgage derivatives can become illiquid and
                         Treasury and supported by the full faith and         hard to value in declining markets.
                         credit of the U.S. government. The Fund may
                         invest in other U.S. Government Securities,          Consistent with its objective, Pioneer High
                         including (a) securities supported by the full       Yield Fund may invest in equity securities
                         faith and credit of the U.S. government but that     issued by both U.S. and non-U.S. issuers,
                         are not direct obligations of the U.S. Treasury,     including common stocks, depositary receipts,
                         (b) securities that are not supported by the full    warrants, rights and other equity interests
                         faith and credit of the U.S. government but are      when Pioneer believes they offer the potential
                         supported by the issuer's ability to borrow from     for capital appreciation or to diversity the
                         the U.S. Treasury, and (c) securities supported      Fund's portfolio.
                         solely by the creditworthiness of the issuer.
                                                                              Pioneer High Yield Fund may invest in
                         Safeco High-Yield Bond Fund may invest up to         securities of Canadian issuers to the same
                         20% of assets in foreign securities.                 extent as U.S. issuers. The Fund may invest
                                                                              up to 15% of its total assets in securities of
                                                                              non-U.S. and non-Canadian issuers, including
                                                                              debt and equity securities of corporate issuers
                                                                              and debt securities of government issuers in
                                                                              developed and emerging markets.
------------------------------------------------------------------------------------------------------------------------------------

22

------------------------------------------------------------------------------------------------------------------------------------
                                         Safeco High-Yield Bond Fund                           Pioneer High Yield Fund
------------------------------------------------------------------------------------------------------------------------------------
 Temporary defensive       Safeco High-Yield Bond Fund may hold cash              Pioneer High Yield Fund may invest all or part
 strategies                or invest in high-quality, short-term securities       of its assets in securities with remaining
                           issued by an agency or instrumentality of the          maturities of less than one year, cash
                           U.S. government, high-quality commercial paper,        equivalents or may hold cash.
                           certificates of deposit, shares of no-load, open-
                           end money market funds, or repurchase
                           agreements.
------------------------------------------------------------------------------------------------------------------------------------
 Diversification           Each Fund is diversified for the purpose of the Investment Company Act, and each Fund is
                           subject to diversification requirements under the Code.
------------------------------------------------------------------------------------------------------------------------------------
 Industry concentration    Each Fund may not invest more than 25% of its assets in any one industry.
------------------------------------------------------------------------------------------------------------------------------------
 Restricted and illiquid   If immediately after and as a result of such           Pioneer High Yield Fund may not invest more
 securities                action the value of the following securities, in       than 15% of its net assets in securities which
                           the aggregate, would exceed 15% of Safeco              are illiquid and other securities which are not
                           High-Yield Bond Fund's net assets, the Fund            readily marketable. Repurchase agreements
                           will not (i) purchase securities for which there       maturing in more than seven days will be
                           is no readily available market, (ii) purchase          included for purposes of the foregoing limit.
                           time deposits maturing in more than seven              Securities subject to restrictions on resale
                           days, (iii) purchase over-the-counter (OTC)            under the 1933 Act are considered illiquid
                           options or hold assets set aside to cover OTC          unless they are eligible for resale pursuant to
                           options written by the Fund, (iv) enter into           Rule 144A or another exemption from the
                           repurchase agreements maturing in more than            registration requirements of the 1933 Act and
                           seven days, or (v) invest in interests in real         are determined to be liquid by Pioneer.
                           estate investment trusts which are not readily
                           marketable or interests in real estate limited
                           partnerships which are not listed or traded on
                           the NASDAQ Stock Market.
------------------------------------------------------------------------------------------------------------------------------------
 Borrowing                 Safeco High-Yield Bond Fund may borrow                 Pioneer High Yield Fund may not borrow
                           money (i) from banks or (ii) by engaging in            money, except the Fund may: (a) borrow from
                           reverse repurchase agreements.                         banks or through reverse repurchase
                                                                                  agreements in an amount up to 33 1/3% of the
                                                                                  Fund's total assets (including the amount
                                                                                  borrowed); (b) to the extent permitted by
                                                                                  applicable law, borrow up to an additional 5%
                                                                                  of the Fund's assets for temporary purposes;
                                                                                  (c) obtain such short-term credits as are
                                                                                  necessary for the clearance of portfolio
                                                                                  transactions; (d) purchase securities on
                                                                                  margin to the extent permitted by applicable
                                                                                  law; and (e) engage in transactions in
                                                                                  mortgage dollar rolls that are accounted for
                                                                                  as financings.
------------------------------------------------------------------------------------------------------------------------------------
 Lending                   Safeco High-Yield Bond Fund may lend                   Pioneer High Yield Fund may lend portfolio
                           securities to qualified institutional investors with   securities with a value that may not exceed
                           a value of up to 33% of the Fund's total assets.       33 1/3% of the value of its assets.
------------------------------------------------------------------------------------------------------------------------------------

23

------------------------------------------------------------------------------------------------------------------------------------
                                             Safeco High-Yield Bond Fund                      Pioneer High Yield Fund
------------------------------------------------------------------------------------------------------------------------------------
 Derivative instruments          Safeco High-Yield Bond Fund may not                  Pioneer High Yield Fund may use futures and
                                 purchase securities on margin. However, the          options on securities, indices and
                                 Fund may (i) obtain short-term credits as            currencies, forward currency exchange
                                 necessary to clear its purchases and sales of        contracts and other derivatives. The Fund
                                 securities, and (ii) make margin deposits in         does not use derivatives as a primary
                                 connection with its use of financial options and     investment technique and generally limits
                                 futures, forward and spot currency contracts,        their use to hedging. However, the Fund may
                                 swap transactions and other financial contracts      use derivatives for a variety of
                                 or derivative instruments.                           non-principal purposes, including:

                                                                                      o    As a hedge against adverse changes in
                                                                                           stock market prices, interest rates or
                                                                                           currency exchange rates
                                                                                      o    As a substitute for purchasing or
                                                                                           selling securities
                                                                                      o    To increase the Fund's return as a
                                                                                           non- hedging strategy that may be
                                                                                           considered speculative
------------------------------------------------------------------------------------------------------------------------------------
 Other investment policies and   As described above, the Funds have substantially similar principal investment strategies and
 restrictions                    policies. Certain of the non-principal investment policies and restrictions are different. For a
                                 more complete discussion of each Fund's other investment policies and fundamental and non-
                                 fundamental investment restrictions, see the SAI.
------------------------------------------------------------------------------------------------------------------------------------
                                                         Buying, Selling and Exchanging Shares
------------------------------------------------------------------------------------------------------------------------------------
 Sales charges                   Purchases under $1,000,000 of Class A shares         The Investor Class shares of Pioneer High
                                 of Safeco High-Yield Bond Fund are subject to        Yield Fund you receive in the
                                 a 4.50% front-end sales charge.                      Reorganization will not be subject to any
                                                                                      sales charge. Moreover, if you own shares
                                 Contingent deferred sales charge of up to 5%         in your own name as of the closing of the
                                 if you redeem Class B shares within six years        Reorganization (i.e., not in the name of a
                                 of purchase.                                         broker or other intermediary) or own shares
                                                                                      in the name of an omnibus account provider
                                 Contingent deferred sales charge of 1% if you        as of the closing of the Reorganization
                                 redeem Class C shares within one year of             that agrees with the Pioneer Fund to
                                 purchase.                                            distinguish beneficial holders in the same
                                                                                      manner and maintain your account, you may
                                 Purchases of Investor Class shares of Fund are       purchase Class A shares of Pioneer High
                                 not subject to a sales load.                         Yield Fund and Class A shares of any fund
                                                                                      in the Pioneer family of funds through such
                                 Safeco High-Yield Bond Fund assesses a               account in the future without paying any
                                 mandatory redemption fee of 2%, as a                 sales charge.
                                 percentage of the amount redeemed or
                                 exchanged, on Class A and Investor Class             Except as described above, Class A shares
                                 shares held less than 30 days.                       of Pioneer High Yield Fund are subject to a
                                                                                      front-end sales charge of up to 4.50%.
------------------------------------------------------------------------------------------------------------------------------------

24

------------------------------------------------------------------------------------------------------------------------------------
                                         Safeco High-Yield Bond Fund                         Pioneer High Yield Fund
------------------------------------------------------------------------------------------------------------------------------------
 Management and other fees   Safeco High-Yield Bond Fund pays an advisory       Pioneer High Yield Fund pays Pioneer a
                             fee on a monthly basis at an annual rate as        management fee equal to:
                             follows:
                                                                                0.70% of average daily net assets up to
                             $0-$250,000,000:                  0.65 of 1%        $500 million;
                             $250,000,001-$750,000,000:        0.55 of 1%       0.65% of the next $500 million;
                             Over $750,000,000:                0.50 of 1%       0.60% of the next $4 billion;
                                                                                0.55% of the next $1 billion;
                             SAM serves as administrator and fund               0.50% of the next $1 billion;
                             accounting agent for Safeco High-Yield Bond        0.45% of the next $1 billion;
                             Fund. The Fund pays SAM an administrative          0.40% of the next $1 billion;
                             services fee of 0.05% of the Fund's average        0.35% of the next $1 billion; and
                             daily net assets up to the first $200,000,000      0.30% on assets over $10 billion.
                             and 0.01% of its net assets thereafter, and an
                             accounting fee of 0.04% of the Fund's average      During its most recent fiscal year, Pioneer
                             daily net assets up to the first $200,000,000      High Yield Fund paid an advisory fee at
                             and 0.01% of its net assets thereafter.            an average rate of 0.61% of average daily
                                                                                net assets.
                             During its most recent fiscal year, Safeco
                             High-Yield Bond Fund paid aggregate advisory       In addition, Pioneer High Yield Fund
                             and administration fees at an average rate of      reimburses Pioneer for certain fund
                             0.74% of average daily net assets.                 accounting and legal expenses incurred on
                             SAM had contractually agreed until April 30,       behalf of the Fund and pays a separate
                             2009, to pay certain fund operating expenses       shareholder servicing/transfer agency fee to
                                                                                PIMSS, an affiliate of Pioneer.
                             (but not all of the operating expenses of the
                             Fund) that exceeded the rate of 0.40% per          Through October 31, 2005, Pioneer may
                             annum of the Fund's average daily net assets.      recover expenses that it incurred under a prior
                             This arrangement included all Fund operating       expense limitation (within three years of being
                             expenses except management fees, Rule 12b-1        incurred) from the Fund if the expense ratio of
                             fees, brokerage commissions, interest, and         the Class A shares is less than 1.00%. Each
                             extraordinary expenses.                            class will reimburse Pioneer no more than
                                                                                the amount by which that class' expenses
                             In 2003, SAM began voluntarily reimbursing the     were reduced.
                             Fund to the extent that its total expenses
                             exceeded the rate of 1.15% per annum of the        For the fiscal year ended October 31, 2003,
                             Fund's average daily net assets for Class A        Pioneer High Yield Fund's total annual
                             shares, 1.90% per annum for Class B and Class      operating expenses for Class A shares were
                             C shares, and 0.90% per annum for Investor         1.06% of average daily net assets. The Fund
                             Class shares.                                      currently does not have an expense limitation
                                                                                for its Class A shares
                             For the fiscal year ended December 31, 2003,
                             the Fund's annual operating expenses for Class
                             A shares, after giving effect to the contractual
                             expense limitation were 1.30%, and without
                             giving effect to the expense limitation, were
                             1.41%. After giving effect to the voluntary
                             expense reimbursement, the operating
                             expenses for Class A shares were 1.15%.
------------------------------------------------------------------------------------------------------------------------------------

25

------------------------------------------------------------------------------------------------------------------------------------
                                         Safeco High-Yield Bond Fund                          Pioneer High Yield Fund
------------------------------------------------------------------------------------------------------------------------------------
 Management and other fees   For the fiscal year ended December 31, 2003,             Pioneer has agreed until the second
 (continued)                 the Fund's annual operating expenses for Class           anniversary of the closing of the
                             B shares, after giving effect to the contractual         Reorganization to limit the expenses
                             expense limitation were 2.05%, and without               (excluding extraordinary expenses) of the
                             giving effect to the expense limitation, were            Investor Class to 0.90% of the average
                             2.88%. After giving effect to the voluntary              daily net assets attributable to the
                             expense reimbursement, the operating                     Investor Class. The Investor Class shares
                             expenses for Class A shares were 1.90%.                  to be issued in the Reorganization will
                                                                                      convert to Class A shares after two years.
                             For the fiscal year ended December 31, 2003,             Class A shares will have higher expenses
                             the Fund's annual operating expenses for Class           per share than Investor Class shares due to
                             C shares, after giving effect to the contractual         the Rule 12b-1 Plan. In addition, although
                             expense limitation were 2.05%, and without               Pioneer has agreed to limit the expenses
                             giving effect to the expense limitation, were            attributable to Investor Class shares,
                             2.45%. After giving effect to the voluntary              Pioneer is not required to limit the
                             expense reimbursement, the operating                     expenses attributable to Class A shares.
                             expenses for Class A shares were 1.90%.

                             For the fiscal year ended December 31, 2003,
                             the Fund's annual operating expenses for
                             Investor Class shares, after giving effect to the
                             contractual expense limitation were 1.05%, and
                             without giving effect to the expense limitation,
                             were 1.27%. After giving effect to the voluntary
                             expense reimbursement, the operating expenses
                             for Investor Class shares were 0.90%.
------------------------------------------------------------------------------------------------------------------------------------
 Distribution and service    Investor Class shares of each Fund are not subject to a Rule 12b-1 fee. Pioneer Investor Class
 (12b-1) fee                 shares will convert into Class A shares after two years. Class A shares of each Fund are subject to
                             a Rule 12b-1 fee equal to 0.25% annually of average daily net assets.
------------------------------------------------------------------------------------------------------------------------------------
 Buying shares               You may buy shares of Safeco High-Yield Bond             You may buy shares from any investment firm
                             Fund directly through Safeco Securities, the             that has a sales agreement with PFD,
                             Fund's principal underwriter or through                  Pioneer High Yield Fund's distributor.
                             brokers, registered investment advisers, banks           Existing shareholders of Safeco High-Yield
                             and other financial institutions that have               Bond Fund who own shares in their own name
                             entered into selling agreements with the Fund's          as of the closing of the Reorganization
                             principal underwriter, as described in the               (i.e., not in the name of a broker or other
                             Fund's prospectus.                                       intermediary) or own shares in the name of
                                                                                      an omnibus account provider as of the
                             Certain account transactions may be done                 closing of the Reorganization that agrees
                             by telephone.                                            with the Pioneer Fund to distinguish
                                                                                      beneficial holders in the same manner and
                                                                                      who maintain their accounts may buy shares
                                                                                      of any fund in the Pioneer family of funds
                                                                                      through such accounts in the future without
                                                                                      paying sales charges.

                                                                                      If the account is established in the
                                                                                      shareholder's own name, shareholders may
                                                                                      also purchase additional shares of Pioneer
                                                                                      High Yield Fund by telephone or online.
------------------------------------------------------------------------------------------------------------------------------------

26

------------------------------------------------------------------------------------------------------------------------------------
                                  Safeco High-Yield Bond Fund                         Pioneer High Yield Fund
------------------------------------------------------------------------------------------------------------------------------------
 Exchange privilege   There are no sales charges on shares you           You may exchange shares of Pioneer High
                      acquire through dividend reinvestment or other     Yield Fund without incurring any fee on the
                      fund distributions or for Class A shares that      exchange with the more than 62 other Pioneer
                      you have exchanged for Class A shares of           Funds. Your exchange would be for Class A
                      another fund.                                      shares, which would be subject to Rule 12b-1
                                                                         fees. An exchange generally is treated as a sale
                      Certain account transactions may be done           and a new purchase of shares for federal
                      by telephone.                                      income tax purposes.

                                                                         If the account is established in the
                                                                         shareholder's own name, shareholders may
                                                                         also exchange shares of Pioneer High Yield
                                                                         Fund for shares of other Pioneer Funds by
                                                                         telephone or online.
------------------------------------------------------------------------------------------------------------------------------------
 Selling shares       Each class of shares is sold at the net asset value per share next calculated after the Fund
                      receives your request in good order.
------------------------------------------------------------------------------------------------------------------------------------
                      You may sell your shares by contacting Safeco      Normally, your investment firm will send your
                      High-Yield Bond Fund directly in writing or by     request to sell shares to PIMSS. You can also
                      contacting a financial intermediary as described   sell your shares by contacting the Fund
                      in the Fund's prospectus.                          directly if your account is registered in
                                                                         your name.
                                                                         If the account is established in the
                                                                         shareholder's own name, shareholders may
                                                                         also redeem shares of Pioneer High Yield
                                                                         Fund by telephone or online.
------------------------------------------------------------------------------------------------------------------------------------

Comparison of Principal Risks of Investing in the Funds

Because each Fund has a similar investment objective, primary investment policies and strategies, the Funds are subject to the same principal risks. You could lose money on your investment in either Fund or not make as much as if you invested elsewhere if:

o Interest rates go up, causing the value of debt securities in the Fund's portfolio to decline

o The issuer of a security owned by a Fund defaults on its obligation to pay principal and/or interest or has its credit rating downgraded

o During periods of declining interest rates, the issuer of a security may exercise its option to prepay principal earlier than scheduled, forcing the Fund to reinvest in lower yielding securities. This is known as call or prepayment risk

o During periods of rising interest rates, the average life of certain types of securities may be extended because of slower than expected principal payments. This may lock in a below market interest rate, increase the security's duration (the estimated period until the security is paid in full) and reduce the value of the security. This is known as extension risk

o The investment adviser's judgment about the attractiveness, relative value or potential appreciation of a particular sector, security or investment strategy proves to be incorrect

o A downturn in equity markets causes the price of convertible securities to drop even when the prices of below investment grade bonds otherwise would not go down

Investment in high yield securities involves substantial risk of loss. High yield securities are considered speculative with respect to the issuer's ability to pay interest and principal and are susceptible to default or decline in market value due to adverse economic and business developments. The market values for high yield securities tend to be very volatile, and these securities are less liquid than investment grade debt securities. For these reasons, an investment in either Fund is subject to the following specific risks:

o Increased price sensitivity to changing interest rates and deteriorating economic environment

27

o Greater risk of loss due to default or declining credit quality

o Adverse company-specific events are more likely to render the issuer unable to make interest and/or principal payments

o A negative perception of the high yield market develops, depressing the price and liquidity of high yield securities. This negative perception could last for a significant period of time

In addition, each Fund holds a material percentage of the outstanding debt securities of certain high yield issuers, which practice may adversely impact the liquidity and market value of those investments. Investments in the Funds are not bank deposits and are not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You could lose money by investing in either Fund.

The Investor Class shares to be issued in the Reorganization will convert to Class A shares after two years. Class A shares will have higher expenses per share than Investor Class shares due to the Rule 12b-1 Plan. In addition, although Pioneer has agreed to limit the expenses attributable to Investor Class shares, Pioneer is not required to limit the expenses attributable to Class A shares.

Past Performance

Set forth below is performance information for each Fund. The bar charts show how each Fund's total return (not including any deduction for sales charges) has varied from year to year for each full calendar year. The tables show average annual total return (before and after taxes) for each Fund over time for each class of shares (including deductions for sales charges) compared with a broad-based securities market index. The bar charts give an indication of the risks of investing in each Fund, including the fact that you could incur a loss and experience volatility of returns year to year. Past performance before and after taxes does not indicate future results.

Safeco High-Yield Bond Fund -- Investor Class Calendar Year Total Returns*

[TABULAR REPRESENTATION OF BAR CHART]

'94              -2.25
'95              15.14
'96              10.39
'97              12.79
'98               4.45
'99               3.74
'00              -5.52
'01              -2.05
'02             -17.47
'03              30.50

* During the period shown in the bar chart, your Safeco Fund's highest quarterly return was 10.53% for the quarter ended June 30, 2003, and the lowest quarterly return was -12.38% for the quarter ended June 30, 2002.

28

Pioneer High Yield Fund -- Class A shares Calendar Year Total Returns*

[TABULAR REPRESENTATION OF BAR CHART]

'99             27.06
'00             12.70
'01             16.74
'02             -2.70
'03             32.13

* During the period shown in the bar chart, since the Fund's inception on February 12, 1998, Pioneer High Yield Fund's highest quarterly return was 11.10% for the quarter ended December 31, 1999, and the lowest quarterly return was -8.97% for the quarter ended September 30, 2002.

Safeco High-Yield Bond Fund Average Annual Total Returns for the Period Ended December 31, 2003

-------------------------------------------------------------------------------------------------------
                                                                     1 Year       5 Years      10 Years
-------------------------------------------------------------------------------------------------------
 Safeco High-Yield Bond Fund, Class A shares
-------------------------------------------------------------------------------------------------------
 Return Before Taxes                                                  24.55%        -0.45%       3.65%
-------------------------------------------------------------------------------------------------------
 Return After Taxes on Distributions(1)                               20.85%        -3.67%       0.20%
-------------------------------------------------------------------------------------------------------
 Return After Taxes on Distributions and Sale of Fund Shares(1)       15.68%        -2.35%       0.95%
-------------------------------------------------------------------------------------------------------
 Safeco High-Yield Bond Fund, Class B shares
-------------------------------------------------------------------------------------------------------
 Return Before Taxes                                                  24.21%        -0.58%       3.66%
-------------------------------------------------------------------------------------------------------
 Safeco High-Yield Bond Fund, Class C shares
-------------------------------------------------------------------------------------------------------
 Return Before Taxes                                                  28.35%        -0.27%       3.59%
-------------------------------------------------------------------------------------------------------
 Safeco High-Yield Bond Fund, Investor Class shares
-------------------------------------------------------------------------------------------------------
 Return Before Taxes                                                  30.50%         0.67%       4.28%
-------------------------------------------------------------------------------------------------------
 Return After Taxes on Distributions(1)                               26.51%        -2.68%       0.75%
-------------------------------------------------------------------------------------------------------
 Return After Taxes on Distributions and Sale of Fund Shares(1)       19.53%        -1.49%       1.44%
-------------------------------------------------------------------------------------------------------
 Merrill Lynch High-Yield Master II Index(2)
  (reflects no deduction for fees, expenses or taxes)                 28.15%         5.02%       7.05%
-------------------------------------------------------------------------------------------------------

(1) After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your situation and may differ from those shown. Furthermore, the after-tax returns shown are not relevant to those who hold their shares through tax-deferred arrangements such as 401(k) plans or IRA accounts, or to investors that are tax-exempt.
(2) The Merrill Lynch High-Yield Master II Index, an unmanaged index of outstanding debt of domestic market issuers rated below investment grade, but not in default, is for reference only and does not mirror the Fund's investments.

29

Pioneer High Yield Fund -- Class A shares Average Annual Total Returns for the Period Ended October 31, 2003

-----------------------------------------------------------------------------------------------------------
                                                                                                 Since
                                                                     1 Year       5 Years      Inception(1)
-----------------------------------------------------------------------------------------------------------
 Pioneer High Yield Fund, Class A shares
-----------------------------------------------------------------------------------------------------------
 Return Before Taxes                                                  26.15%        15.49%        11.71%
-----------------------------------------------------------------------------------------------------------
 Return After Taxes on Distributions(2)                               23.09%        11.39%         7.99%
-----------------------------------------------------------------------------------------------------------
 Return After Taxes on Distributions and Sale of Fund Shares(2)       16.78%        10.72%         7.63%
-----------------------------------------------------------------------------------------------------------
 Merrill Lynch High-Yield Master II Index(3)
  (reflects no deduction for fees, expenses or taxes)                 28.15%         5.02%         4.45%
-----------------------------------------------------------------------------------------------------------
 Merrill Lynch Index of Convertible Bonds(4)
  (speculative quality)
  (reflects no deduction for fees, expenses or taxes)                 35.99%         7.11%         7.17%
-----------------------------------------------------------------------------------------------------------

(1) The Fund commenced operations on February 12, 1998.
(2) After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your situation and may differ from those shown. Furthermore, the after-tax returns shown are not relevant to those who hold their shares through tax-deferred arrangements such as 401(k) plans or IRA accounts, or to investors that are tax-exempt.
(3) The Merrill Lynch High-Yield Master II Index, an unmanaged index of outstanding debt of domestic market issuers rated below investment grade, but not in default, is for reference only and does not mirror the Fund's investments.

(4) The Merrill Lynch Index of Convertible Bonds (Speculative Quality), a market capitalization weighted index including mandatory and non-mandatory domestic corporate convertible securities, is for reference only and does not mirror the Fund's investments.

Pioneer High Yield Fund's Investor Class shares will not be outstanding prior to the closing of the Reorganization and consequently have no performance history. However, the performance record of the Investor Class would be modestly higher than the performance of Class A shares due to the lower expenses applicable to the Investor Class.

The most recent portfolio manager's discussion of each Fund's performance is attached as Exhibit D.

The Funds' Fees and Expenses

Shareholders of both Funds pay various fees and expenses, either directly or indirectly. The tables below show the fees and expenses that you would pay if you were to buy and hold shares of each Fund. The expenses in the tables appearing below are based on (i) for Safeco High-Yield Bond Fund, the expenses of Safeco High-Yield Bond Fund for the year ended December 31, 2003 and (ii) for Pioneer High Yield Fund, the expenses of Pioneer High Yield Fund for the year ended October 31, 2003. Future expenses for all share classes may be greater or less.

                                                                                                                       Pro Forma
                                                                                                                        Pioneer
                                                               Safeco       Safeco        Safeco          Safeco       High Yield
                                                             High-Yield   High-Yield    High-Yield      High-Yield        Fund
                                                              Bond Fund    Bond Fund    Bond Fund        Bond Fund      Investor
Shareholder transaction fees (paid directly from               Class A      Class B      Class C      Investor Class     Class(9)
your investment)                                            ------------ ------------  ------------  ---------------- -----------
Maximum sales charge (load) when you buy shares
 as a percentage of offering price ........................       4.50%(6)     None         None             None         None(1)
Maximum deferred sales charge (load) as a percentage
 of purchase price or the amount you receive when you sell
 shares, whichever is less ................................       None         5.00%(7)     1.00%(8)         None         None
Redemption fees for shares held less than 30 days .........       2.00%        None         None             2.00%         N/A
Wire redemption fee .......................................      $ 204        $ 204        $ 204            $ 204        $  10
Annual low balance fee ....................................      $ 125        $ 125        $ 125            $ 125          N/A

30

                                                                                                                      Pro Forma
                                                                                                                       Pioneer
                                                        Safeco         Safeco         Safeco           Safeco         High Yield
                                                      High-Yield     High-Yield     High-Yield       High-Yield          Fund
                                                       Bond Fund      Bond Fund      Bond Fund        Bond Fund        Investor
Shareholder transaction fees (paid directly from        Class A        Class B        Class C      Investor Class       Class(9)
your investment)                                     ------------   ------------   ------------   ----------------   -----------
Annual fund operating expenses (deducted from
 fund assets) (as a % of average net assets)
Management fee ...................................       0.65%          0.65%          0.65%            0.65%           0.58%
Distribution and service (12b-1) fee .............       0.25%          1.00%          1.00%            None            None
Other expenses ...................................       0.51%          1.23%          0.80%            0.62%           0.38%
Total fund operating expenses ....................       1.41%          2.88%          2.45%            1.27%           0.96%
Expense reimbursement/reduction ..................       0.11%(2)       0.83%(2)       0.40%(2)         0.22%(2)        0.06%(3)
Net fund operating expenses ......................       1.30%          2.05%          2.05%            1.05%           0.90%


(1) No sales load will apply to shares received in the Reorganization by shareholders of your Safeco Fund who become shareholders of record of Pioneer High Yield Fund through the Reorganization. In addition, shareholders of your Safeco Fund who own shares in their own name as of the closing of the Reorganization (i.e., not in the name of a broker or other intermediary) or own shares in the name of an omnibus account provider that agrees with the Pioneer Fund to distinguish beneficial holders in the same manner and who maintain their accounts may purchase Class A shares of Pioneer High Yield Fund or of any fund in the Pioneer family of funds through such account in the future without paying this sales charge.

(2) As described above, SAM had contractually agreed to reimburse Safeco High-Yield Bond Fund for certain fund operating expenses (but not all of the operating expenses of the Fund) that exceeded the rate of 0.40% per annum of the Fund's average daily net assets. This arrangement included all fund operating expenses except management fees, Rule 12b-1 fees, brokerage commissions, interest, and extraordinary expenses. In 2003, SAM began voluntarily reimbursing the Fund to the extent that its total expenses exceeded the rate of 1.15% per annum of the Fund's average daily net assets for Class A shares, 1.90% per annum for Class B and Class C shares, and 0.90% per annum for Investor Class shares. The above table reflects "contractual" expense reimbursements from SAM, if any, but does not reflect "voluntary" expense reimbursements by SAM.
(3) Pioneer has agreed that through the second anniversary of the closing of the Reorganization, Pioneer will limit the expenses (excluding extraordinary expenses) of the Investor Class shares of Pioneer High Yield Fund to 0.90% of average daily net assets.
(4) There is a higher charge for international wire redemptions, which may vary by country or dollar amount.
(5) A low balance fee is charged once each year in December for accounts with balances under $1,000 in your Safeco Fund.
(6) Purchases of $1,000,000 or more of Class A shares of your Safeco Fund are not subject to a front-end sales charge, but a 1.00% deferred sales charge will apply to redemptions made in the first twelve months except with respect to participant-directed redemptions from qualified retirement plans.
(7) The contingent deferred sales charge on Class B shares of your Safeco Fund reduces to zero after six years from purchase, and the Class B shares convert to Class A shares at that time.
(8) The contingent deferred sales charge on Class C shares applies only to redemptions made in the first twelve months after purchase.
(9) The Investor Class shares to be issued in the Reorganization will convert to Class A shares after two years. Class A shares will have higher expenses per share than Investor Class shares due to the Rule 12b-1 Plan. In addition, although Pioneer has agreed to limit the expenses attributable to Investor Class shares, Pioneer is not required to limit the expenses attributable to Class A shares. Class A shares do not currently have an expense limitation and may be subject to higher total operating expenses.

The hypothetical example below helps you compare the cost of investing in each Fund. It assumes that: (a) you invest $10,000 in each Fund for the time periods shown, (b) you reinvest all dividends and distributions, (c) your investment has a 5% return each year, (d) each Fund's gross operating expenses remain the same, (e) the expense limitations are in effect for five years for Safeco High-Yield Bond Fund and two years for Pioneer High Yield Fund and (f) and the Investor Class shares of Pioneer High Yield Fund convert to Class A shares after two years. The examples are for comparison purposes only and are not a representation of either Fund's actual expenses or returns, either past or future.

Example

Safeco High-Yield Bond Fund

Class A shares
Year 1 ..................                   $  576
Year 3 ..................                   $  844
Year 5 ..................                   $1,131
Year 10 .................                   $2,014

Class B shares                 With redemption     Without redemption
Year 1 ..................         $  708              $  208
Year 3 ..................         $  943              $  643
Year 5 ..................         $1,303              $1,103
Year 10 .................         $2,155              $2,155

31

Class C shares                  With redemption     Without redemption
Year 1 ......................      $  308              $  208
Year 3 ......................      $  643              $  643
Year 5 ......................      $1,103              $1,103
Year 10 .....................      $2,613              $2,613

Investor Class shares
Year 1 ......................               $  107
Year 3 ......................               $  334
Year 5 ......................               $  579
Year 10 .....................               $1,425

Pro Forma Pioneer High Yield Fund

Investor Class shares
Year 1 ......................               $  92
Year 3 ......................               $  300
Year 5 ......................               $  539
Year 10 .....................               $1,225

Reasons for the Proposed Reorganization

The Trustees believe that the proposed Reorganization is in the best interests of Safeco High-Yield Bond Fund. The Trustees considered the following matters, among others, in approving the proposal.

First, SAM, the investment adviser to the Safeco Fund until August 2, 2004, was acquired by Symetra. Symetra informed the Trustees that it did not intend to continue to provide investment advisory services to the Safeco Funds. Consequently, a change in your Safeco Fund's investment adviser was necessary.

Second, the investment performance of Pioneer High Yield Fund, which has one of the best performance records of any mutual fund specializing in high yield securities. For the one and five year periods ended June 30, 2004, Class A shares of Pioneer High Yield Fund had an average annual return of 11.63% and 14.31% compared to an average annual return of the Class A shares and Investor Class shares of 6.42% and 11.67% (one year) and -0.42% and 0.74% (five years), respectively, during the same periods. In addition, the Trustees considered the track record of Pioneer in managing equity and fixed income mutual funds.

Third, the resources of Pioneer. At June 30, 2004, Pioneer managed over 62 investment companies and accounts with approximately $35 billion in assets. Pioneer is part of the global asset management group of UniCredito Italiano S.p.A., one of the largest banking groups in Italy, providing investment management and financial services to mutual funds, institutional and other clients. As of June 30, 2004, assets under management of UniCredito Italiano S.p.A. were approximately $151 billion worldwide. Shareholders of your Safeco Fund would become part of a significantly larger family of funds that offers a more diverse array of investment options and enhanced shareholder account options. The Pioneer family of mutual funds offers over 62 funds, including domestic and international equity and fixed income funds and a money market fund that will be available to your Safeco Fund's shareholders through exchanges. In addition, Pioneer offers shareholders additional options for their accounts, including the ability to transact and exchange shares over the telephone or online and the ability to access account values and transaction history in all of the shareholder's direct accounts in the Pioneer Funds over the telephone or online.

Fourth, Pioneer High Yield Fund's lower operating expenses and Pioneer's commitment until the second anniversary of the Reorganization to limit the expenses (excluding extraordinary expenses) of the Investor Class of Pioneer High Yield Fund to 0.90% of average daily net assets. The estimated expenses of the Investor Class shares of Pioneer High Yield Fund are below both the gross expenses and expenses net of contractual expense reimbursement of each class of shares of your Safeco Fund. Although you will experience higher expenses once the Investor Class shares convert to Class A shares after two years, Pioneer High Yield Fund's Class A expense ratio for the most recent fiscal year was 1.06% of average daily net assets, which was below the net expenses of the Class A shares of your Safeco Fund and only one basis point above the net expenses of the Investor Class of your Safeco Fund.

Fifth, the substantially larger size of Pioneer High Yield Fund offers greater opportunity for diversification of the investment portfolio, which should help to reduce risks.

Sixth, shareholders who own shares in their name as of the closing of the Reorganization (i.e., not in the name of a broker or other intermediary) and maintain their account may purchase additional Class A shares of the corresponding Pioneer Fund through such account in the future or may exchange those shares for Class A shares of another Pioneer Fund or purchase Class A share of another Pioneer Fund without paying any sales charge.

32

Seventh, the Investor Class shares of Pioneer High Yield Fund received in the Reorganization will provide Safeco High-Yield Bond Fund shareholders with exposure to substantially the same investment product as they currently have.

Pioneer and Symetra will pay all of out of pocket expenses of the Safeco Funds and the Pioneer Funds associated with the Reorganizations, including, but not limited to: (1) the expenses associated with the preparation, printing and mailing of any shareholder communications, including this joint Proxy Statement/Prospectus, and any filings with the SEC and other governmental authorities in connection with the Reorganizations; (2) the fees and expenses of any proxy solicitation firm retained in connection with the Reorganizations;
(3) the legal fees and expenses incurred by the Safeco Funds in connection with the Reorganizations; and (4) the Trustees' fees and out of pocket expenses incurred as a result of the Reorganizations.

The Trustees considered that Pioneer and Symetra will benefit from the Reorganization. See "Will Pioneer and Symetra Benefit from the Reorganizations."

The Board of Trustees of Pioneer High Yield Fund also considered that the Reorganization presents an excellent opportunity for the Pioneer High Yield Fund to acquire investment assets without the obligation to pay commissions or other transaction costs that a fund normally incurs when purchasing securities. This opportunity provides an economic benefit to Pioneer High Yield Fund and its shareholders.

CAPITALIZATION

The following table sets forth the capitalization of each Fund as of September 30, 2004, and the pro forma capitalization of the combined Fund as of September 30, 2004.

                                          Safeco                                      Pro Forma
                                        High-Yield               Pioneer               Pioneer
                                         Bond Fund           High Yield Fund       High Yield Fund
                                    September 30, 2004     September 30, 2004     September 30, 2004
                                   --------------------   --------------------   -------------------
Total Net Assets (in thousands)            $ 39,683              $7,811,801            $7,851,484
 Class A shares ................           $  1,857              $3,469,718            $3,469,718
 Class B shares ................           $    465              $1,780,040            $1,780,040
 Class C shares ................           $    261              $2,411,841            $2,411,841
 Investor Class shares .........           $ 37,101                     N/A            $   39,683
 Class Y shares ................                N/A              $  143,957            $  143,957
 Class R shares ................                N/A              $    6,245            $    6,245

Net Asset Value Per Share
 Class A shares ................           $   5.78              $    11.72            $    11.72
 Class B shares ................           $   5.78              $    11.77            $    11.77
 Class C shares ................           $   5.79              $    11.88            $    11.88
 Investor Class shares .........           $   5.78                     N/A            $    11.72
 Class Y shares ................                N/A              $    11.69            $    11.69
 Class R shares ................                N/A              $    12.87            $    12.87

Shares Outstanding
 Class A shares ................            321,002             295,917,476           295,917,476
 Class B shares ................            480,411             151,211,694           151,211,694
 Class C shares ................             45,023             203,097,222           203,097,222
 Investor Class shares .........          6,417,136                     N/A             3,385,922
 Class Y shares ................                N/A              12,311,037            12,311,037
 Class R shares ................                N/A                 485,113               485,113

It is impossible to predict how many shares of Pioneer High Yield Fund will actually be received and distributed by your Safeco Fund on the Reorganization date. The table should not be relied upon to determine the amount of Pioneer High Yield Fund's shares that will actually be received and distributed.

BOARD'S EVALUATION AND RECOMMENDATION

For the reasons described above, the Trustees, including the Independent Trustees, approved the Reorganization. In particular, the Trustees determined that the Reorganization is in the best interests of your Safeco Fund. Similarly, the Board of Trustees of Pioneer High Yield Fund, including its Independent Trustees, approved the Reorganization. They also determined that the Reorganization is in the best interests of Pioneer High Yield Fund.

The Trustees recommend that the shareholders of your Safeco Fund vote FOR the proposal to approve the Agreement and Plan of Reorganization.

33

Safeco Intermediate-Term Bond Fund and Pioneer Bond Fund

PROPOSAL 1(c)

Approval of Agreement and Plan of Reorganization

SUMMARY

The following is a summary of more complete information appearing later in this Proxy Statement/Prospectus or incorporated herein. You should read carefully the entire Proxy Statement/Prospectus, including the form of Agreement and Plan of Reorganization attached as EXHIBIT A-1, because it contains details that are not in the summary.

The Investor Class shares to be issued in the Reorganization will convert to Class A shares after two years. Class A shares will have a higher expenses per share than Investor Class shares due to the Rule 12b-1 Plan. In addition, although Pioneer has agreed to limit the expenses attributable to Investor Class shares, Pioneer is not required to limit the expenses attributable to Class A shares.

In the table below, if a row extends across the entire table, the policy disclosed applies to both your Safeco Fund and the Pioneer Fund.

Comparison of Safeco Intermediate-Term Bond Fund to Pioneer Bond Fund

------------------------------------------------------------------------------------------------------------------------------------
                                    Safeco Intermediate-Term Bond Fund                        Pioneer Bond Fund
------------------------------------------------------------------------------------------------------------------------------------
 Business                  A series of Safeco Managed Bond Trust, a            A diversified open-end management
                           diversified open-end management investment          investment company registered under the
                           company organized as a Delaware statutory           Investment Company Act and organized as a
                           trust.                                              Delaware statutory trust.
------------------------------------------------------------------------------------------------------------------------------------
 Net assets as of          $10 million                                         $259 million
 June 30, 2004
------------------------------------------------------------------------------------------------------------------------------------
 Investment advisers and   Investment adviser (until August 2, 2004):          Investment adviser:
 portfolio managers        SAM                                                 Pioneer

                           Portfolio Managers (since 2004 and until            Portfolio Managers:
                           August 2, 2004):                                    Day-to-day management of the Fund's
                           Greg Card                                           portfolio is the responsibility of a team of
                           Assistant Vice President, SAM                       fixed income portfolio managers led by
                           Joined SAM in 2001                                  Kenneth J. Taubes.

                           Tim Hokari                                          Mr. Taubes joined Pioneer as a senior vice
                           Assistant Vice President, SAM                       president in September 1998 and has been an
                           Joined SAM in 2000                                  investment professional since 1982.

                           Lesley Fox
                           Assistant Vice President, SAM
                           Joined SAM in 2000

                           Nancy McFadden
                           Fixed Income Analyst, SAM
                           Joined SAM in 2001

                           Currently Pioneer is acting as investment adviser
                           to Safeco Intermediate-Term Bond Fund. The
                           Portfolio Managers of the Pioneer Bond Fund, as
                           indicated in the next column, are currently
                           managing your Safeco Fund.
------------------------------------------------------------------------------------------------------------------------------------

34

------------------------------------------------------------------------------------------------------------------------------------
                                  Safeco Intermediate-Term Bond Fund                         Pioneer Bond Fund
------------------------------------------------------------------------------------------------------------------------------------
 Investment objective    Safeco Intermediate-Term Bond Fund seeks a          Pioneer Bond Fund seeks current income by
                         high level of current income as is consistent       investing primarily in an investment-grade
                         with the preservation of capital.                   portfolio, consistent with capital preservation
                                                                             and prudent investment risk.
------------------------------------------------------------------------------------------------------------------------------------
 Primary investments     Under normal circumstances, Safeco                  Under normal market conditions, Pioneer
                         Intermediate-Term Bond Fund invests at least        Bond Fund invests at least 80% of total
                         80% of net assets (plus any borrowings for          assets in:
                         investment purposes) in bonds, including but
                         not limited to corporate, government and            o Debt securities issued or guaranteed by the
                         mortgage bonds, most of which will be                 U.S. government or its agencies and
                         investment-grade quality, whether rated               instrumentalities
                         or unrated.                                         o Debt securities, including convertible debt,
                                                                               of corporate and other issuers rated at least
                         The dollar weighted average maturity of Safeco        investment grade at the time of investment,
                         Intermediate-Term Bond Fund generally ranges          and comparably rated commercial paper
                         between three and ten years.                        o Cash and cash equivalents, certificates of
                                                                               deposit, repurchase agreements maturing in
                                                                               one week or less and bankers' acceptances
------------------------------------------------------------------------------------------------------------------------------------
 Investment strategies   In managing the portfolio and selecting             Pioneer considers both broad economic and
                         securities, SAM historically considered:            issuer specific factors in selecting a portfolio
                                                                             designed to achieve the fund's investment
                         o The price of the security relative to its rating  objective. In assessing the appropriate
                           and market sector                                 maturity, rating and sector weighting of the
                         o Structural features, such as an issuer's right    fund's portfolio, Pioneer considers a variety of
                           to buy the bond back at a stated price or the     factors that are expected to influence
                           Fund's right to require the issuer to buy the     economic activity and interest rates. These
                           bond back at a stated price                       factors include fundamental economic
                         o The effect the security might have on             indicators, such as the rates of economic
                           existing diversification of Fund assets and       growth and inflation, Federal Reserve
                           allocation among various market sectors           monetary policy and the relative value of the
                         o The effect the security might have on the         U.S. dollar compared to other currencies.
                           yield and sensitivity to interest rate changes    Once Pioneer determines the preferable
                           of the Fund's overall portfolio                   portfolio characteristics, it selects individual
                                                                             securities based upon the terms of the
                         Safeco Intermediate-Term Bond Fund may              securities (such as yields compared to U.S.
                         engage in short-term trading to achieve             Treasuries or comparable issuers), liquidity
                         its objective.                                      and rating, sector and issuer diversification.
------------------------------------------------------------------------------------------------------------------------------------
 Other investments       Safeco Intermediate-Term Bond Fund may              Pioneer Bond Fund may invest up to 20% of its
                         invest up to 20% of its assets in high yield        total assets in debt securities rated below
                         debt securities rated below investment grade        investment grade or, if unrated, of equivalent
                         ("junk" or "high-risk" bonds) and may invest in     quality as determined by Pioneer.
                         Yankee sector bonds and Eurodollar bonds.
                                                                             Up to 15% of its total assets in equity and
                         Safeco Intermediate-Term Bond Fund may also         debt securities of non-U.S. corporate issuers
                         invest in mortgage-backed or asset-backed           and in debt securities of non-U.S. government
                         securities.                                         issuers.

                         Safeco Intermediate-Term Bond Fund may invest       Pioneer Bond Fund will not invest more than
                         up to 20% of assets in foreign securities.          5% of its total assets in the securities of
                                                                             emerging markets issuers.
------------------------------------------------------------------------------------------------------------------------------------

35

------------------------------------------------------------------------------------------------------------------------------------
                                    Safeco Intermediate-Term Bond Fund                            Pioneer Bond Fund
------------------------------------------------------------------------------------------------------------------------------------
 Other investments (continued)                                                          Pioneer Bond Fund may invest a substantial
                                                                                        portion of its assets in mortgage-related
                                                                                        securities, which represent interests in
                                                                                        pools of mortgage loans assembled for sale
                                                                                        to investors by various U.S. governmental
                                                                                        agencies, government-related organizations
                                                                                        and private issuers. These investments may
                                                                                        include mortgage-related derivative
                                                                                        securities such as collateralized mortgage
                                                                                        obligations.

                                                                                        Pioneer Bond Fund may invest in securities
                                                                                        of Canadian issuers to the same extent as
                                                                                        securities of U.S. issuers.
------------------------------------------------------------------------------------------------------------------------------------
 Temporary defensive             Safeco Intermediate-Term Bond Fund may hold            Pioneer Bond Fund may invest all or part of
 strategies                      cash or invest in high-quality, short-term             its assets in securities with remaining
                                 securities issued by an agency or instrumentality      maturities of less than one year, cash
                                 of the U.S. government, high-quality commercial        equivalents or may hold cash.
                                 paper, certificates of deposit, shares of no-load,
                                 open-end money market funds, or repurchase
                                 agreements.
------------------------------------------------------------------------------------------------------------------------------------
 Diversification                 Each Fund is diversified for the purpose of the Investment Company Act, and each Fund is
                                 subject to diversification requirements under the Code.
------------------------------------------------------------------------------------------------------------------------------------
 Industry concentration          Each Fund may not invest more than 25% of its assets in any one industry.
------------------------------------------------------------------------------------------------------------------------------------
 Restricted and illiquid         If immediately after and as a result of such           Pioneer Bond Fund may not invest more than
 securities                      action the value of the following securities, in       15% of its net assets in securities which
                                 the aggregate, would exceed 15% of Safeco              are illiquid and other securities which are
                                 Intermediate-Term Bond Fund's net assets, the          not readily marketable. Repurchase
                                 Fund will not (i) purchase securities for which        agreements maturing in more than seven days
                                 there is no readily available market, (ii)             will be included for purposes of the
                                 purchase time deposits maturing in more than           foregoing limit. Securities subject to
                                 seven days, (iii) purchase over-the-counter            restrictions on resale under the 1933 Act
                                 (OTC) options or hold assets set aside to cover        are considered illiquid unless they are
                                 OTC options written by the Fund, (iv) enter into       eligible for resale pursuant to Rule 144A
                                 repurchase agreements maturing in more than            or another exemption from the registration
                                 seven days, or (v) invest in interests in real         requirements of the 1933 Act and are
                                 estate investment trusts which are not readily         determined to be liquid by Pioneer.
                                 marketable or interests in real estate limited
                                 partnerships which are not listed or traded on
                                 the NASDAQ Stock Market.
------------------------------------------------------------------------------------------------------------------------------------
 Borrowing                       Safeco Intermediate-Term Bond Fund may                 Pioneer Bond Fund may not borrow money,
                                 borrow money (i) from banks or (ii) by                 except the Fund may: (a) borrow from banks
                                 engaging in reverse repurchase agreements.             or through reverse repurchase agreements in
                                                                                        an amount up to 33 1/3% of the Fund's total
                                                                                        assets (including the amount borrowed); (b)
                                                                                        to the extent permitted by applicable law,
                                                                                        borrow up to an additional 5% of the Fund's
                                                                                        assets for temporary purposes; (c) obtain
                                                                                        such short-term credits as are necessary
                                                                                        for the clearance of portfolio
                                                                                        transactions;
------------------------------------------------------------------------------------------------------------------------------------

36

------------------------------------------------------------------------------------------------------------------------------------
                                      Safeco Intermediate-Term Bond Fund                                Pioneer Bond Fund
------------------------------------------------------------------------------------------------------------------------------------
 Borrowing (continued)                                                                  (d) purchase securities on margin to the
 Lending                         Safeco Intermediate-Term Bond Fund may lend            extent permitted by applicable law; and (e)
                                 securities to qualified institutional investors        engage in transactions in mortgage dollar
                                 with a value of up to 33% of the Fund's total          rolls that are accounted for as financings.
                                 assets.
------------------------------------------------------------------------------------------------------------------------------------
 Derivative instruments          Safeco Intermediate-Term Bond Fund may not             Pioneer Bond Fund may lend portfolio
                                 purchase securities on margin. However, the            securities with a value that may not exceed
                                 Fund may (i) obtain short-term credits as              33 1/3% of the value of its total assets.
                                 necessary to clear its purchases and sales of
                                 securities, and (ii) make margin deposits in
                                 connection with its use of financial options and
                                 futures, forward and spot currency contracts,
                                 swap transactions and other financial contracts
                                 or derivative instruments.
------------------------------------------------------------------------------------------------------------------------------------
 Other investment policies and   As described above, the Funds have substantially       Pioneer Bond Fund may use futures and
                                 similar principal investment strategies and            options on securities, indices and
 restrictions                    policies. Certain of the non-principal investment      currencies, forward currency exchange
                                 policies and restrictions are different. For a         contracts and other derivatives. The Fund
                                 more complete discussion of each Fund's other          does not use derivatives as a primary
                                 investment policies and fundamental and non-           investment technique and generally limits
                                 fundamental investment restrictions, see the SAI.      their use to hedging. However, the Fund may
                                                                                        use derivatives for a variety of
                                                                                        non-principal purposes, including:

                                                                                        o As a hedge against adverse changes in
                                                                                          stock market prices, interest rates or
                                                                                          currency exchange rates
                                                                                        o As a substitute for purchasing or
                                                                                          selling securities
                                                                                        o To increase the Fund's return as a
                                                                                          non-hedging strategy that may be
                                                                                          considered speculative
------------------------------------------------------------------------------------------------------------------------------------
                                                             Buying, Selling and Exchanging Shares
------------------------------------------------------------------------------------------------------------------------------------
 Sales charges                   Purchases under $1,000,000 of Class A shares           The Investor Class shares of Pioneer Bond
                                 of Safeco Intermediate-Term Bond Fund are              Fund you receive in the Reorganization will
                                 subject to a 3.50% front-end sales charge.             not be subject to any sales charge.
                                 Contingent deferred sales charge of up to 4%           Moreover, if you own shares in your own
                                 if you redeem Class B shares within five years         name as of the closing of the
                                 of purchase.                                           Reorganization (i.e., not in the name of a
                                 Contingent deferred sales charge of 1% if you          broker or other intermediary) or own shares
                                 redeem Class C shares within one year of               in the name of an omnibus account provider
                                 purchase.                                              as of the closing of the Reorganization
                                 Purchases of Investor Class shares of the Fund         that agrees with the Pioneer Fund to
                                 are not subject to a sales load.                       distinguish beneficial holders in the same
                                 The Fund assesses a mandatory redemption               manner and maintain your account, you may
                                 fee of 2%, as a percentage of the amount               purchase Class A shares of Pioneer Bond
                                 redeemed or exchanged, on Class A and                  Fund and Class A shares of any fund in the
                                 Investor Class shares held less than 30 days           Pioneer family of funds through such
                                                                                        account in the future without paying any
                                                                                        sales charge. Except as described above,
                                                                                        Class A shares of Pioneer Bond Fund are
                                                                                        subject to a front-end sales charge of up
                                                                                        to 4.50%.
------------------------------------------------------------------------------------------------------------------------------------

37

------------------------------------------------------------------------------------------------------------------------------------
                                      Safeco Intermediate-Term Bond Fund                            Pioneer Bond Fund
------------------------------------------------------------------------------------------------------------------------------------
 Management and other fees   Safeco Intermediate-Term Bond Fund pays an
                             advisory fee on a monthly basis at an annual               Pioneer Bond Fund pays Pioneer a management
                             rate as follows:                                           fee equal to 0.50% of the Fund's average
                                                                                        daily net assets.
                             $0-750,000,000:                       0.50 of 1%
                             $750,000,001-$1,250,000,000:          0.45 of 1%           During its most recent fiscal year, Pioneer
                             Over $1,250,000,000:                  0.40 of 1%           Bond Fund paid an advisory fee at an
                                                                                        average rate of 0.50% of average daily net
                             SAM serves as administrator and fund                       assets.
                             accounting agent for Safeco Intermediate-
                             Term Bond Fund. The Fund pays SAM an                       In addition, the Fund reimburses Pioneer
                             administrative services fee of 0.05% of the                for certain fund accounting and legal
                             Fund's average daily net assets up to the first            expenses incurred on behalf of the Fund and
                             $200,000,000 and 0.01% of its net assets                   pays a separate shareholder
                             thereafter, and an accounting fee of 0.04% of              servicing/transfer agency fee to PIMSS, an
                             the Fund's average daily net assets up to the              affiliate of Pioneer.
                             first $200,000,000 and 0.01% of its net assets
                             thereafter.                                                For the fiscal year ended June 30, 2004,
                                                                                        the Fund's total annual operating expenses
                             During its most recent fiscal year, Safeco                 for Class A shares were 1.14% of average
                             Intermediate-Term Bond Fund paid aggregate                 daily net asset. The Fund does not
                             advisory and administration fees at an average             currently have an expense limitation for
                             rate of 0.59% of average daily net assets.                 its Class A shares.

                             SAM had contractually agreed until April 30,               Pioneer has agreed until the second
                             2009, to pay certain fund operating expenses               anniversary of the closing of the
                             (but not all of the operating expenses of the              Reorganization to limit the expenses
                             Fund) that exceeded the rate of 0.40% per                  (excluding extraordinary expenses) of the
                             annum of the Fund's average daily net assets.              Investor Class to 0.74% of the average
                             This arrangement included all Fund operating               daily net assets attributable to the
                             expenses except management fees, Rule 12b-1                Investor Class.
                             fees, brokerage commissions, interest, and
                             extraordinary expenses.                                    The Investor Class shares to be issued in
                                                                                        the Reorganization will convert to Class A
                             In 2003, SAM began voluntarily reimbursing the             shares after two years. Class A shares will
                             Fund to the extent that its total expenses                 have higher expenses per share than
                             exceeded the rate of 0.99% per annum of the                Investor Class shares due to the Rule 12b-1
                             Fund's average daily net assets for Class A                Plan. In addition, although Pioneer has
                             shares, 1.74% per annum for Class B and Class              agreed to limit the expenses attributable
                             C shares, and 0.74% per annum for Investor                 to Investor Class shares, Pioneer is not
                             Class shares.                                              required to limit the expenses attributable
                                                                                        to Class A shares.
                             For the fiscal year ended December 31, 2003,
                             the Fund's annual operating expenses for Class
                             A shares, after giving effect to the contractual
                             expense limitation were 1.15%, and without
                             giving effect to the expense limitation, were
                             2.05%. After giving effect to the voluntary
                             expense reimbursement, the operating
                             expenses for Class A shares were 0.99%.
------------------------------------------------------------------------------------------------------------------------------------

38

------------------------------------------------------------------------------------------------------------------------------------
                                     Safeco Intermediate-Term Bond Fund                         Pioneer Bond Fund
------------------------------------------------------------------------------------------------------------------------------------
 Management and other fees   For the fiscal year ended December 31, 2003,
 (continued)                 the Fund's annual operating expenses for Class
                             B shares, after giving effect to the contractual
                             expense limitation were 1.90%, and without
                             giving effect to the expense limitation, were
                             2.78%. After giving effect to the voluntary
                             expense reimbursement, the operating
                             expenses for Class B shares were 1.74%.

                             For the fiscal year ended December 31, 2003,
                             the Fund's annual operating expenses for Class
                             C shares, after giving effect to the contractual
                             expense limitation were 1.90%, and without
                             giving effect to the expense limitation, were
                             42.54%. After giving effect to the voluntary
                             expense reimbursement, the operating
                             expenses for Class C shares were 1.74%.

                             For the fiscal year ended December 31, 2003,
                             the Fund's annual operating expenses for
                             Investor Class shares, after giving effect to the
                             contractual expense limitation were 0.90%, and
                             without giving effect to the expense limitation,
                             were 1.53% per share. After giving effect to
                             the voluntary expense reimbursement, the
                             operating expenses for Investor Class shares
                             were 0.74%.
------------------------------------------------------------------------------------------------------------------------------------
 Distribution and service    Investor Class shares of each Fund are not subject to a Rule 12b-1 fee. Pioneer Investor Class
 (12b-1) fee                 shares will convert into Class A shares after two years. Class A shares of each Fund are subject to
                             a Rule 12b-1 fee equal to 0.25% annually of average daily net assets.
------------------------------------------------------------------------------------------------------------------------------------
 Buying shares               You may buy shares of Safeco Intermediate-         You may buy shares from any investment firm
                             Term Bond Fund directly through Safeco             that has a sales agreement with PFD,
                             Securities, the Fund's principal underwriter, or   Pioneer Bond Fund's distributor. Existing
                             through brokers, registered investment             shareholders of Safeco Intermediate-Term
                             advisers, banks and other financial institutions   Bond Fund who own shares in their own name
                             that have entered into selling agreements with     as of the closing of the Reorganization
                             the Fund's principal underwriter, as described     (i.e., not in the name of a broker or other
                             in the Fund's prospectus.                          intermediary) or own shares in the name of
                                                                                an omnibus account provider as of the
                             Certain account transactions may be done           closing of the Reorganization that agrees
                             by telephone.                                      with the Pioneer Fund to distinguish
                                                                                beneficial holders in the same manner and
                                                                                who maintain their accounts may buy shares
                                                                                of any fund in the Pioneer family of funds
                                                                                through such accounts in the future without
                                                                                paying sales charges.

                                                                                If the account is established in the
                                                                                shareholder's own name, shareholders may
                                                                                also purchase additional shares of Pioneer
                                                                                Bond Fund by telephone or online.
------------------------------------------------------------------------------------------------------------------------------------

39

------------------------------------------------------------------------------------------------------------------------------------
                           Safeco Intermediate-Term Bond Fund                       Pioneer Bond Fund
------------------------------------------------------------------------------------------------------------------------------------
 Exchange privilege   There are no sales charges on shares you          You may exchange shares of Pioneer Bond
                      acquire through dividend reinvestment or other    Fund without incurring any fee on the
                      fund distributions or for Class A shares that     exchange with the more than 62 other Pioneer
                      you have exchanged for Class A shares of          Funds. Your exchange would be for Class A
                      another fund.                                     shares, which would be subject to Rule 12b-1
                                                                        fees. An exchange generally is treated as a
                      Certain account transactions may be done          sale and a new purchase of shares for federal
                      by telephone.                                     income tax purposes.

                                                                        If the account is established in the
                                                                        shareholder's own name, shareholders may
                                                                        also exchange shares of Pioneer Bond Fund
                                                                        for shares of other Pioneer Funds by
                                                                        telephone or online.
------------------------------------------------------------------------------------------------------------------------------------
 Selling shares       Each class of shares will be sold at net asset value per share next calculated after the Fund
                      receives your request in good order.
------------------------------------------------------------------------------------------------------------------------------------
                      You may sell your shares by contacting Safeco     Normally, your investment firm will send your
                      Intermediate-Term Bond Fund directly in writing   request to sell shares to PIMSS. You can also
                      or by contacting a financial intermediary as      sell your shares by contacting the Fund
                      described in the Fund's prospectus.               directly if your account is registered in
                                                                        your name.

                                                                        If the account is established in the
                                                                        shareholder's own name, shareholders may
                                                                        also redeem shares of Pioneer Bond Fund by
                                                                        telephone or online.
------------------------------------------------------------------------------------------------------------------------------------

Comparison of Principal Risks of Investing in the Funds

Because each Fund has a similar investment objective, primary investment policies and strategies, the Funds are subject to the same principal risks. The market value of fixed income securities tends to be more volatile the longer the maturity of such security. Since Pioneer Bond Fund may invest in securities of longer maturity than your Safeco Fund, an investment in Pioneer Bond Fund may have correspondingly greater risk. You could lose money on your investment in either Fund or not make as much as if you invested elsewhere if:

o Interest rates go up, causing the value of debt securities in the Fund's portfolio to decline.

o The issuer of a security owned by a Fund defaults on its obligation to pay principal and/or interest or has its credit rating downgraded.

o During periods of declining interest rates, the issuer of a security may exercise its option to prepay principal earlier than scheduled, forcing the Fund to reinvest in lower yielding securities. This is known as call or prepayment risk.

o During periods of rising interest rates, the average life of certain types of securities may be extended because of slower than expected principal payments. This may lock in a below market interest rate, increase the security's duration (the estimated period until the security is paid in full) and reduce the value of the security. This is known as extension risk.

o The investment adviser's judgment about the attractiveness, relative value or potential appreciation of a particular sector, security or investment strategy proves to be incorrect.

o A downturn in equity markets causes the price of convertible securities to drop even when the prices of below investment grade bonds otherwise would not go down.

o To the extent that the Fund invests significantly in high yield securities, its exposure to the credit risks associated with such securities may be greater, its income and net asset value may be more volatile, and it may be more difficult to achieve preservation of principal.

Government sponsored entities such as the Federal Home Loan Mortgage Corporation (Freddie Mac), the Federal National Mortgage Association (FNMA) and the Federal Home Loan Banks (FHLB), although chartered or sponsored by Congress, are not funded by

40

congressional appropriations and the debt and mortgage-backed securities issued by them are neither guaranteed nor issued by the U.S. government. To the extent the Funds invest significantly in mortgage-backed securities, its exposure to prepayment and extension risks may be greater than if it invested in other fixed income securities.

The Investor Class shares to be issued in the Reorganization will convert to Class A shares after two years. Class A shares will have higher expenses per share than Investor Class shares due to the Rule 12b-1 Plan. In addition, although Pioneer has agreed to limit the expenses attributable to Investor Class shares, Pioneer is not required to limit the expenses attributable to Class A shares.

Past Performance

Set forth below is performance information for each Fund. The bar charts show how each Fund's total return (not including any deduction for sales charges) has varied from year to year for each full calendar year. The tables show average annual total return (before and after taxes) for each Fund over time for each class of shares (including deductions for sales charges) compared with a broad-based securities market index. The bar charts give an indication of the risks of investing in each Fund, including the fact that you could incur a loss and experience volatility of returns year to year. Past performance before and after taxes does not indicate future results.

Safeco Intermediate-Term Bond Fund -- Investor Class Calendar Year Total Returns*

[TABULAR REPRESENTATION OF BAR CHART]

'95             17.35
'96              0.02
'97              8.23
'98              8.43
'99             -3.82
'00             11.57
'01              6.95
'02              7.44
'03              3.56

* During the period shown in the bar chart, your Safeco Fund's highest quarterly return since the Fund's inception on February 28, 1994 was 5.74% for the quarter ended June 30, 1995, and the lowest quarterly return was -3.27% for the quarter ended March 31, 1996.

41

Pioneer Bond Fund -- Class A shares Calendar Year Total Returns*

[TABULAR REPRESENTATION OF BAR CHART]

'94             -4.20
'95             18.16
'96              1.96
'97              9.16
'98              7.69
'99             -3.20
'00              8.45
'01              7.54
'02              8.77
'03              8.85

* During the period shown in the bar chart, Pioneer Bond Fund's highest quarterly return was 6.11% for the quarter ended June 30, 1995, and the lowest quarterly return was -3.03% for the quarter ended March 31, 1994.

Safeco Intermediate-Term Bond Fund Average Annual Total Returns as of December 31, 2003

---------------------------------------------------------------------------------------------------------
                                                                                               Since
                                                                     1 Year      5 Years     Inception(1)
---------------------------------------------------------------------------------------------------------
 Safeco Intermediate-Term Bond Fund, Class A shares
---------------------------------------------------------------------------------------------------------
 Return Before Taxes                                                  -0.31%       3.96%        4.95%
---------------------------------------------------------------------------------------------------------
 Return After Taxes on Distributions(2)                               -1.67%       2.01%        2.81%
---------------------------------------------------------------------------------------------------------
 Return After Taxes on Distributions and Sale of Fund Shares(2)       -0.21%       2.14%        2.87%
---------------------------------------------------------------------------------------------------------
 Safeco Intermediate-Term Bond Fund, Class B shares
---------------------------------------------------------------------------------------------------------
 Return Before Taxes                                                  -1.33%       3.77%        4.80%
---------------------------------------------------------------------------------------------------------
 Safeco Intermediate-Term Bond Fund, Class C shares
---------------------------------------------------------------------------------------------------------
 Return Before Taxes                                                   1.47%       3.90%        4.69%
---------------------------------------------------------------------------------------------------------
 Safeco Intermediate-Term Bond Fund, Investor Class shares
---------------------------------------------------------------------------------------------------------
 Return Before Taxes                                                   3.56%       5.01%        5.58%
---------------------------------------------------------------------------------------------------------
 Return After Taxes on Distributions(2)                                2.05%       2.94%        3.34%
---------------------------------------------------------------------------------------------------------
 Return After Taxes on Distributions and
  Sale of Fund Shares(2)                                               2.30%       2.97%        3.35%
---------------------------------------------------------------------------------------------------------
 Lehman Brothers Aggregate Bond Index(3)
  (reflects no deduction for fees, expenses or taxes)                  4.10%       6.62%        7.11%
---------------------------------------------------------------------------------------------------------

(1) The Fund commenced operations on February 28, 1994.
(2) After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your situation and may differ from those shown. Furthermore, the after-tax returns shown are not relevant to those who hold their shares through tax-deferred arrangements such as 401(k) plans or IRA accounts, or to investors that are tax-exempt.
(3) The Lehman Brothers Aggregate Bond Index, an unmanaged index of securities from the Lehman Brothers Government/Corporate Bond Index, Mortgage-Backed Securities Index, and Asset Backed Securities Index, is for reference only and does not mirror the Fund's investments.

42

Pioneer Bond Fund -- Class A shares Average Annual Total Returns as of December 31, 2003

---------------------------------------------------------------------------------------------------------
                                                                    1 Year       5 Years      10 Years
---------------------------------------------------------------------------------------------------------
 Pioneer Bond Fund, Class A shares
---------------------------------------------------------------------------------------------------------
 Return Before Taxes                                                  6.76%        43.54%       3.50%
---------------------------------------------------------------------------------------------------------
 Return After Taxes on Distributions(1)                               5.71%         3.54%       3.53%
---------------------------------------------------------------------------------------------------------
 Return After Taxes on Distributions and Sale of Fund Shares(1)       2.51%         2.71%       3.11%
---------------------------------------------------------------------------------------------------------
 Lehman Brothers Aggregate Bond Index(2)
  (reflects no deduction for fees, expenses or taxes)                 4.10%         6.62%       6.95%
---------------------------------------------------------------------------------------------------------

(1) After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your situation and may differ from those shown. Furthermore, the after-tax returns shown are not relevant to those who hold their shares through tax-deferred arrangements such as 401(k) plans or IRA accounts, or to investors that are tax-exempt.
(2) The Lehman Brothers Aggregate Bond Index, an unmanaged index of securities from the Lehman Brothers Government/Corporate Bond Index, Mortgage-Backed Securities Index, and Asset Backed Securities Index, is for reference only and does not mirror the Fund's investments.

Pioneer Bond Fund's Investor Class shares will not be outstanding prior to the closing of the Reorganization and consequently have no performance history. However, the performance record of the Investor Class would be modestly higher than the performance of Class A, B and C shares due to the lower expenses applicable to the Investor Class.

The most recent portfolio manager's discussion of each Fund's performance is attached as Exhibit D.

The Funds' Fees and Expenses

Shareholders of both Funds pay various fees and expenses, either directly or indirectly. The tables below show the fees and expenses that you would pay if you were to buy and hold shares of each Fund. The expenses in the tables appearing below are based on (i) for your Safeco Fund, the expenses of your Safeco Fund for the period ended December 31, 2003 and (ii) for Pioneer Bond Fund, the expenses of Pioneer Bond Fund for the period ended June 30, 2004. Future expenses for all share classes may be greater or less.

                                                                                                               Safeco
                                                                                                           Intermediate-  Pro Forma
                                                               Safeco          Safeco          Safeco        Term Bond     Pioneer
                                                            Intermediate-   Intermediate-   Intermediate-       Fund      Bond Fund
                                                           Term Bond Fund  Term Bond Fund  Term Bond Fund     Investor     Investor
Shareholder transaction fees                                   Class A         Class B         Class C         Class       Class(9)
(paid directly from your investment)                       --------------- --------------- --------------- ------------- ----------
Maximum sales charge (load) when you buy shares
 as a percentage of offering price ........................       3.50%(6)        None            None          None        None(1)
Maximum deferred sales charge (load) as a percentage
 of purchase price or the amount you receive when you sell
 shares, whichever is less ................................       None            4.00%(7)        1.00%8        None        None
Redemption fees for shares held less than 30 days .........       2.00%           None            None          2.00%        N/A
Wire redemption fee .......................................      $ 204           $ 204           $ 204         $ 204       $  10
Annual low balance fee ....................................      $ 125           $ 125           $ 125         $ 125         N/A
Annual fund operating expenses (deducted from
 fund assets) (as a % of average net assets)
Management fee ............................................       0.50%           0.50%           0.50%         0.50%       0.50%
Distribution and service (12b-1) fee ......................       0.25%           1.00%           1.00%         None        None
Other expenses ............................................       1.30%           1.28%          41.04%         1.03%       0.45%
Total fund operating expenses .............................       2.05%           2.78%          42.54%         1.53%       0.95%
Expense reimbursement/reduction ...........................       0.90%2          0.88%(2)       40.64%(2)      0.63%(2)    0.21%(3)
Net fund operating expenses ...............................       1.15%           1.90%           1.90%         0.90%       0.74%

43


(1) No sales load will apply to shares received in the Reorganization by shareholders of your Safeco Fund who become shareholders of record of Pioneer Bond Fund through the Reorganization. In addition, shareholders of your Safeco Fund who own shares in their own name as of the closing of the Reorganization (i.e., not in the name of a broker or other intermediary) or own shares in the name of an omnibus account provider that agrees with the Pioneer Fund to distinguish beneficial holders in the same manner and who maintain their accounts may purchase Class A shares of Pioneer Bond Fund or of any fund in the Pioneer family of funds through such account in the future without paying this sales charge.

(2) As described above, SAM had contractually agreed to reimburse Safeco Intermediate-Term Bond Fund for certain Fund operating expenses (but not all of the operating expenses of the Fund) that exceeded the rate of 0.40% per annum of the Fund's average daily net assets. This arrangement included all fund operating expenses except management fees, Rule 12b-1 fees, brokerage commissions, interest, and extraordinary expenses. In 2003, SAM began voluntarily reimbursing the Fund to the extent that its total expenses exceeded the rate of 0.99% per annum of the Fund's average daily net assets for Class A shares, 1.74% per annum for Class B and Class C shares, and 0.74% per annum for Investor Class shares. The above table reflects "contractual" expense reimbursements from SAM, if any, but does not reflect "voluntary" expense reimbursements by SAM.
(3) Pioneer has agreed that through the second anniversary of the closing of the Reorganization, Pioneer will limit the expenses (excluding extraordinary expenses) of the Investor Class shares of Pioneer Bond Fund to 0.74% of average daily net assets.
(4) There is a higher charge for international wire redemptions, which may vary by country or dollar amount.
(5) A low balance fee is charged once in year in December for accounts with balances under $1,000 in your Safeco Fund.
(6) Purchases of $1,000,000 or more of Class A shares of your Safeco Fund are not subject to a front-end sales charge, but a 1.00% deferred sales charge will apply to redemptions made in the first twelve months except with respect to participant-directed redemptions from qualified retirement plans.
(7) The contingent deferred sales charge on Class B shares of your Safeco Fund reduces to zero after five years from purchase, and the Class B shares convert to Class A shares at that time.
(8) The contingent deferred sales charge on Class C shares applies only to redemptions made in the first twelve months after purchase.
(9) The Investor Class shares to be issued in the Reorganization will convert to Class A shares after two years. Class A shares will have higher expenses per share than Investor Class shares due to the Rule 12b-1 Plan. In addition, although Pioneer has agreed to limit the expenses attributable to Investor Class shares, Pioneer is not required to limit the expenses attributable to Class A shares.

The hypothetical example below helps you compare the cost of investing in each Fund. It assumes that: (a) you invest $10,000 in each Fund for the time periods shown, (b) you reinvest all dividends and distributions, (c) your investment has a 5% return each year, (d) each Fund's gross operating expenses remain the same, (e) the expense limitations are in effect five years for Safeco Intermediate-Term Bond Fund and two years for Pioneer Bond Fund and (f) and the Investor Class shares of Pioneer Bond Fund convert to Class A shares after two years. The examples are for comparison purposes only and are not a representation of either Fund's actual expenses or returns, either past or future.

Example

Safeco Intermediate-Term Bond Fund

Class A shares
Year 1 ..............                 $  463
Year 3 ..............                 $  703
Year 5 ..............                 $  961
Year 10 .............                 $2,247

Class B shares          With Redemption      Without Redemption
Year 1 ..............      $  593               $193
Year 3 ..............      $  797               $  597
Year 5 ..............      $1,126               $1,026
Year 10 .............      $2,389               $2,389

Class C shares          With Redemption      Without Redemption
Year 1 ..............      $  293               $  193
Year 3 ..............      $  597               $  597
Year 5 ..............      $1,026               $1,026
Year 10 .............      $2,709               $2,709

Investor Class shares
Year 1 ..............                 $  92
Year 3 ..............                 $  287
Year 5 ..............                 $  498
Year 10 .............                 $1,518

44

Pro Forma Pioneer Bond Fund

Investor Class shares
Year 1 ....................                 $  76
Year 3 ....................                 $  281
Year 5 ....................                 $  548
Year 10 ...................                 $1,312

Reasons for the Proposed Reorganization

The Trustees believe that the proposed Reorganization is in the best interests of Safeco Intermediate-Term Bond Fund. The Trustees considered the following matters, among others, in approving the proposal.

First, SAM, the investment adviser to the Safeco Fund until August 2, 2004, was acquired by Symetra. Symetra informed the Trustees that it did not intend to continue to provide investment advisory services to the Safeco Funds. Consequently, a change in your Safeco Fund's investment adviser was necessary.

Second, the investment performance of Pioneer Bond Fund, which has outperformed your Safeco Fund over the most recent one, five and ten year periods. For the one, five and ten year periods ended June 30, 2004, Class A shares of Pioneer Bond Fund had an average annual return of 2.98%, 6.70% and 6.72%, respectively, compared to an average annual return of the Class A shares and Investor Class shares of 3.66% and 0.02% (one year), 4.86% and 5.86% (five years) and 5.24% and 5.88% (ten years), respectively, during the same periods. In addition, the Trustees considered the track record of Pioneer in managing equity and fixed income mutual funds.

Third, the resources of Pioneer. At June 30, 2004, Pioneer managed over 62 investment companies and accounts with approximately $35 billion in assets. Pioneer is part of the global asset management group of UniCredito Italiano S.p.A., one of the largest banking groups in Italy, providing investment management and financial services to mutual funds, institutional and other clients. As of June 30, 2004, assets under management of UniCredito Italiano S.p.A. were approximately $151 billion worldwide. Shareholders of your Safeco Fund would become part of a significantly larger family of funds that offers a more diverse array of investment options and enhanced shareholder account options. The Pioneer family of mutual funds offers over 62 funds, including domestic and international equity and fixed income funds and a money market fund that will be available to your Safeco Fund's shareholders through exchanges. In addition, Pioneer offers shareholders additional options for their accounts, including the ability to transact and exchange shares over the telephone or online and the ability to access account values and transaction history in all of the shareholder's direct accounts in the Pioneer Funds over the telephone or online.

Fourth, Pioneer Bond Fund's lower gross expenses and Pioneer's commitment until the second anniversary of the Reorganization to limit the expenses (excluding extraordinary expenses) of the Investor Class of Pioneer Bond Fund to 0.74 % of average daily net assets. The gross expense ratio of Pioneer Bond Fund's Class A shares is lower than the gross expense ratio of each class of shares of your Safeco Fund. In addition, the net expense ratio of the Investor Class of Pioneer Bond Fund is lower than the net expenses of the Class A, Class B and Class C shares of your Safeco Fund and the same as the net expenses of the Investor Class. Although you will experience higher expenses once the Investor Class shares convert to Class A shares after two years, your expenses will remain the same until the second anniversary of the Reorganization.

Fifth, the substantially larger size of Pioneer Bond Fund offers greater opportunity for diversification of the investment portfolio, which should help to reduce risks.

Sixth, shareholders who own shares in their name as of the closing of the Reorganization (i.e., not in the name of a broker or other intermediary) and maintain their account may purchase additional Class A shares of the corresponding Pioneer Fund through such account in the future or may exchange those shares for Class A shares of another Pioneer Fund or purchase Class A share of another Pioneer Fund without paying any sales charge.

Seventh, the Trustees also considered the differences in the investment policies of the two Funds, particularly Pioneer Bond Fund's ability to invest in securities with longer maturities than your Safeco Fund. While this may result in Pioneer Bond Fund having greater volatility of net asset value than your Safeco Fund, the Trustees believe that the factors in favor of the Reorganization mitigate this risk.

Pioneer and Symetra will pay all out of pocket expenses of the Safeco Funds and the Pioneer Funds associated with the Reorganizations, including, but not limited to: (1) the expenses associated with the preparation, printing and mailing of any shareholder communications, including this joint Proxy Statement/Prospectus, and any filings with the SEC and other governmental authorities in connection with the Reorganizations; (2) the fees and expenses of any proxy solicitation firm retained in connection with the Reorganizations;
(3) the legal fees and expenses incurred by the Safeco Funds in connection with the Reorganizations; and (4) the Trustees' fees and out of pocket expenses incurred as a result of the Reorganizations.

45

The Trustees considered that Pioneer and Symetra will benefit from the Reorganization. See "Will Pioneer and Symetra Benefit from the Reorganizations."

The Board of Trustees of Pioneer Bond Fund also considered that the Reorganization presents an excellent opportunity for the Pioneer Bond Fund to acquire investment assets without the obligation to pay commissions or other transaction costs that a fund normally incurs when purchasing securities. This opportunity provides an economic benefit to Pioneer Bond Fund and its shareholders.

CAPITALIZATION

The following table sets forth the capitalization of each Fund as of September 30, 2004, and the pro forma capitalization of the combined Fund as of September 30, 2004.

                                          Safeco                                      Pro Forma
                                     Intermediate-Term           Pioneer               Pioneer
                                         Bond Fund              Bond Fund             Bond Fund
                                    September 30, 2004     September 30, 2004     September 30, 2004
                                   --------------------   --------------------   -------------------
Total Net Assets (in thousands)          $ 9,598                $265,836                 $275,434
 Class A shares ................         $ 1,608                $163,765                 $163,765
 Class B shares ................         $   604                $ 56,548                 $ 56,548
 Class C shares ................         $    99                $ 28,246                 $ 28,245
 Investor Class shares .........         $ 7,286                     N/A                 $  9,598
 Class Y shares ................             N/A                $ 16,894                 $ 16,894
 Class R shares ................             N/A                $    383                 $    383
Net Asset Value Per Share
 Class A shares ................         $  8.51                $   9.36                 $   9.36
 Class B shares ................         $  8.51                $   9.32                 $   9.32
 Class C shares ................         $  8.51                $   9.30                 $   9.30
 Investor Class shares .........         $  8.52                    N/A                  $   9.36
 Class Y shares ................             N/A                $   9.30                 $   9.30
 Class R shares ................             N/A                $   9.30                 $   9.37
Shares Outstanding
 Class A shares ................         188,948              17,479,859               17,479,859
 Class B shares ................          70,949               6,061,254                6,061,254
 Class C shares ................          11,688               3,036,946                3,036,946
 Investor Class shares .........         854,733                    N/A                 1,025,427
 Class Y shares ................             N/A              16,894,081               16,894,081
 Class R shares ................             N/A                 383,073                  383,073

It is impossible to predict how many shares of Pioneer Bond Fund will actually be received and distributed by your Safeco Fund on the Reorganization date. The table should not be relied upon to determine the amount of Pioneer Bond Fund's shares that will actually be received and distributed.

Board's Evaluation and Recommendation

For the reasons described above, the Trustees, including the Independent Trustees, approved the Reorganization. In particular, the Trustees determined that the Reorganization is in the best interests of your Safeco Fund. Similarly, the Board of Trustees of Pioneer Bond Fund, including its Independent Trustees, approved the Reorganization. They also determined that the Reorganization is in the best interests of Pioneer Bond Fund.

The Trustees recommend that the shareholders of your Safeco Fund vote FOR the proposal to approve the Agreement and Plan of Reorganization.

46

Safeco Intermediate-Term Municipal Bond Fund and Pioneer Tax Free Income Fund

PROPOSAL 1(d)

Approval of Agreement and Plan of Reorganization

SUMMARY

The following is a summary of more complete information appearing later in this Proxy Statement/Prospectus or incorporated herein. You should read carefully the entire Proxy Statement/Prospectus, including the Agreement and Plan of Reorganization attached as EXHIBIT A-1, because it contains details that are not in the summary.

The Investor Class shares to be issued in the Reorganization will convert to Class A shares after two years. Class A shares will have higher expenses per share than Investor Class shares due to the Rule 12b-1 Plan. In addition, although Pioneer has agreed to limit the expenses attributable to Investor Class shares, Pioneer is not required to limit the expenses attributable to Class A shares.

In the table below, if a row extends across the entire table, the policy disclosed applies to both your Safeco Fund and the Pioneer Fund.

Comparison of Safeco Intermediate-Term Municipal Bond Fund to Pioneer Tax Free Income Fund

------------------------------------------------------------------------------------------------------------------------------------
                                         Safeco Intermediate-Term
                                            Municipal Bond Fund                          Pioneer Tax Free Income Fund
------------------------------------------------------------------------------------------------------------------------------------
 Business                  A series of Safeco Tax-Exempt Bond Trust, a          A diversified open-end management
                           diversified open-end management investment           investment company registered under the
                           company organized as a Delaware statutory            Investment Company Act and organized as a
                           trust.                                               Delaware statutory trust.
------------------------------------------------------------------------------------------------------------------------------------
 Net assets as of          $16.4 million                                        $332 million
 June 30, 2004
------------------------------------------------------------------------------------------------------------------------------------
 Investment advisers and   Investment adviser (until August 2, 2004):           Investment adviser:
 portfolio managers        SAM                                                  Pioneer

                           Portfolio Managers (until August 2, 2004):           Portfolio Managers:
                           Mary Metastasio (since 1996)                         Day-to-day management of the Fund's
                           Vice President, SAM                                  portfolio is the responsibility of a team of
                                                                                fixed income portfolio managers led by
                           Stephen C. Bauer (since 2003)                        Kenneth J. Taubes.
                           President and Director, SAM
                           Associated with SAM since 1971                       Mr. Taubes joined Pioneer as a senior vice
                                                                                president in September 1998 and has been
                           Currently Pioneer is acting as investment            an investment professional since 1982.
                           adviser to Safeco Intermediate-Term Municipal
                           Bond Fund. The Portfolio Managers of the
                           Pioneer Tax Free Income Fund, as indicated in
                           the next column, currently manages your
                           Safeco Fund.
------------------------------------------------------------------------------------------------------------------------------------
 Investment objective      Safeco Intermediate-Term Municipal Bond Fund         Pioneer Tax Free Income Fund seeks as high a
                           seeks to provide a high level of current interest    level of current income exempt from federal
                           income exempt from federal income tax as is          income taxes as possible consistent with the
                           consistent with prudent investment risk.             preservation of capital.
------------------------------------------------------------------------------------------------------------------------------------

47

------------------------------------------------------------------------------------------------------------------------------------
                                      Safeco Intermediate-Term
                                         Municipal Bond Fund                           Pioneer Tax Free Income Fund
------------------------------------------------------------------------------------------------------------------------------------
 Primary investments     Under normal circumstances, Safeco                 Normally, Pioneer Tax Free Income Fund
                         Intermediate-Term Municipal Bond Fund invests      invests at least 80% of its total assets in
                         at least 80% of its net assets (plus any           investment grade securities that provide
                         borrowings for investment purposes) in             income that is exempt from regular federal
                         investment grade municipal bonds with              income tax and may not be subject to the
                         maturities of more than one year and the           alternative minimum tax. These investments
                         interest on which is exempt from federal           include bonds, notes and other debt
                         income tax.                                        instruments issued by or on behalf of states,
                                                                            counties, municipalities, territories and
                         Safeco Intermediate-Term Municipal Bond Fund       possessions of the United States and the
                         will not invest in securities the income interest  District of Columbia and their authorities,
                         on which is a tax preference item for purposes     political subdivisions, agencies or
                         of the federal alternative minimum tax.            instrumentalities.

                         Safeco Intermediate-Term Municipal Bond Fund       Pioneer Tax Free Income Fund may invest in
                         will maintain an average dollar-weighted           securities the income interest on which is a
                         maturity of between three and ten years.           tax preference item for purposes of the federal
                                                                            alternative minimum tax.

                                                                            Pioneer Tax Free Income Fund may invest in
                                                                            securities of any maturity.

                                                                            Pioneer Tax Free Income Fund may invest
                                                                            25% or more of its assets in issuers in any
                                                                            one or more states or securities the payments
                                                                            on which are derived from gas, electric,
                                                                            telephone, sewer and water segments of the
                                                                            municipal bond market. The Fund may also
                                                                            invest up to 20% of its assets in industrial
                                                                            development bonds.

                                                                            Pioneer Tax Free Income Fund's investments
                                                                            may have fixed or variable principal payments
                                                                            and all types of interest rate payment and reset
                                                                            terms, including fixed and floating rates,
                                                                            inverse floating rate, zero coupon, contingent,
                                                                            deferred and payment in kind and auction
                                                                            rate features.
------------------------------------------------------------------------------------------------------------------------------------
 Investment strategies   In managing the portfolio and selecting            Pioneer considers both broad economic factors
                         securities, SAM historically considered, among     and issuer-specific factors in selecting a
                         other things:                                      portfolio designed to achieve Pioneer Tax Free
                                                                            Income Fund's investment objective. In
                         o Yield                                            assessing the appropriate maturity and rating
                         o Maturity                                         weighting of the Fund's portfolio, Pioneer
                         o Structural features such as an issuer's right    considers a variety of factors that are expected
                           to buy the bond back at a stated price or        to influence economic activity and interest
                           the Fund's right to buy the bond back at a       rates. These factors include fundamental
                           stated price                                     economic indicators such as the rates of
                         o Credit quality (including the underlying rating  economic growth and inflation, Federal Reserve
                           of insured bonds)                                monetary policy and the other currencies. Once
                         o The purpose the issuer is financing;
------------------------------------------------------------------------------------------------------------------------------------

48

------------------------------------------------------------------------------------------------------------------------------------
                                      Safeco Intermediate-Term
                                        Municipal Bond Fund                            Pioneer Tax Free Income Fund
------------------------------------------------------------------------------------------------------------------------------------
 Investment strategies   o The original offering price                     Pioneer determines the preferable portfolio
 (continued)             o Any state or local tax exemption                characteristics, Pioneer selects individual
                         o The amount of discount off or premium on        securities based upon the terms of the
                         the stated principal amount of the bond           securities (such as yields compared to U.S.
                         represented by the price offered                  Treasuries or comparable issues), liquidity and
                                                                           rating and issuer diversification.
                         After evaluating a bond, SAM compared the
                         bond to other available bonds, which may have
                         had different features, and would buy the bond
                         if it appeared to offer the best relative value.
                         relative value of the U.S. dollar compared to
------------------------------------------------------------------------------------------------------------------------------------
 Other investments       Safeco Intermediate-Term Municipal Bond Fund      Pioneer Tax Free Income Fund may invest up to
                         may invest up to 20% of its assets in unrated     20% of its assets in industrial development bonds.
                         municipal bonds, as long as the adviser
                         determines they are of comparable quality to      Pioneer Tax Free Income Fund may invest up to
                         investment-grade securities. Unrated securities   20% of its net assets in securities of other
                         are not necessarily lower in quality than rated   investment companies, investment grade
                         securities but may not be as attractive to as     commercial paper, U.S. government securities,
                         many investors as rated securities.               U.S. or foreign bank instruments and repurchase
                                                                           agreements.
                         Safeco Intermediate-Term Municipal Bond Fund
                         will invest no more than 33% of its total assets  Pioneer Tax Free Income Fund may invest up to
                         in municipal bonds rated in the fourth highest    10% of its net assets in debt securities rated
                         grade (or in comparable unrated bonds subject     below investment grade or, if unrated, of
                         to the 20% limit). Such bonds are of medium       equivalent quality as determined by Pioneer.
                         grade, have speculative characteristics, and are  Debt securities rated below investment grade
                         more likely to have a weakened capacity to        are commonly referred to as "junk bonds" and
                         make principal and interest payments under        are considered speculative. Below investment
                         changing economic conditions or upon              grade debt securities involve greater risk of
                         deterioration in the financial condition of the   loss, are subject to greater price volatility and
                         issuer.                                           are less liquid, especially during periods of
                                                                           economic uncertainty or change, than higher
                         Safeco Intermediate-Term Municipal Bond Fund      quality debt securities.
                         will not hold more than 5% of its net assets
                         in below investment-grade securities or, if       Pioneer Tax Free Income Fund may invest up to
                         unrated, in securities that cease to be           10% of its net assets in inverse floating rate
                         comparable to a rated investment-grade security   obligations (a type of derivative instrument).
                         (such below investment-grade securities are       Inverse floating rate obligations represent
                         commonly referred to as "high yield" or "junk"    interests in tax-exempt bonds.
                         bonds).
                                                                           The interest rate on inverse floating rate
                         Safeco Intermediate-Term Municipal Bond           obligations will generally decrease as short-
                         Fund may invest up to 20% of assets in            term interest rates increase, and increase as
                         foreign securities.                               short-term rates decrease. Inverse floating
                                                                           rate obligations may be volatile and involve
                                                                           leverage risk.

                                                                           Pioneer Tax Free Income Fund's investments
                                                                           may have fixed or variable principal payments
                                                                           and all types of interest rate payment and
                                                                           reset terms, including fixed and floating rates,
                                                                           inverse floating rate, zero coupon, contingent,
                                                                           deferred and payment in kind and auction
                                                                           rate features.
------------------------------------------------------------------------------------------------------------------------------------

49

------------------------------------------------------------------------------------------------------------------------------------
                                        Safeco Intermediate-Term
                                          Municipal Bond Fund                           Pioneer Tax Free Income Fund
------------------------------------------------------------------------------------------------------------------------------------
 Temporary defensive      Safeco Intermediate-Term Municipal Bond Fund        Pioneer Tax Free Income Fund may invest
 strategies               may hold cash or invest in high-quality, short-     all or part of its assets in securities with
                          term securities issued by an agency or              remaining maturities of less than one year,
                          instrumentality of the U.S. government, high-       cash equivalents or may hold cash.
                          quality commercial paper, certificates of
                          deposit, shares of no-load, open-end money
                          market funds, or repurchase agreements.
------------------------------------------------------------------------------------------------------------------------------------
 Diversification          Each Fund is diversified for the purpose of the Investment Company Act, and each Fund is
                          subject to diversification requirements under the Code.
------------------------------------------------------------------------------------------------------------------------------------
 Industry concentration   Safeco Intermediate-Term Municipal Bond Fund        Pioneer Tax Free Income Fund may invest
                          may not invest more than 25% of its assets in       25% or more of its assets in issuers in any
                          any one industry.                                   one or more states or securities the payments
                                                                              on which are derived from gas, electric,
                                                                              telephone, sewer and water segments of the
                                                                              municipal bond market.
------------------------------------------------------------------------------------------------------------------------------------
 Restricted and           If immediately after and as a result of such        Pioneer Tax Free Income Fund will not invest
 illiquid securities      action the value of the following securities, in    more than 10% of its net assets in illiquid
                          the aggregate, would exceed 15% of Safeco           and other securities that are not readily
                          Intermediate-Term Municipal Bond Fund's net         marketable. Repurchase agreements maturing
                          assets, the Fund will not (i) purchase securities   in more than seven days will be included for
                          for which there is no readily available market,     purposes of the foregoing limit. Securities
                          (ii) purchase time deposits maturing in more        subject to restrictions on resale under the
                          than seven days, (iii) purchase over-the-counter    1933 Act are considered illiquid unless they
                          (OTC) options or hold assets set aside to cover     are eligible for resale pursuant to Rule 144A
                          OTC options written by the Fund, (iv) enter into    or another exemption from the registration
                          repurchase agreements maturing in more than         requirements of the 1933 Act and are
                          seven days, or (v) invest in interests in real      determined to be liquid by Pioneer.
                          estate investment trusts which are not readily
                          marketable or interests in real estate limited
                          partnerships which are not listed or traded on
                          the NASDAQ Stock Market.
------------------------------------------------------------------------------------------------------------------------------------
 Borrowing                Safeco Intermediate-Term Municipal Bond Fund        Pioneer Tax Free Income Fund may not
                          may borrow money (i) from banks or (ii) by          borrow money, except from a bank for
                          engaging in reverse repurchase agreements.          temporary or emergency purposes and not
                                                                              for investment purposes, and then only in an
                                                                              amount not exceeding 5% of the value of the
                                                                              Fund's total assets at the time of borrowing.
------------------------------------------------------------------------------------------------------------------------------------
 Lending                  Safeco Intermediate-Term Municipal Bond Fund        Pioneer Tax Free Income Fund may not
                          may lend securities to qualified institutional      make loans, except through the purchase of
                          investors with a value of up to 33% of the          securities, including repurchase agreements, in
                          Fund's total assets.                                accordance with its investment objective,
                                                                              policies and limitations.
------------------------------------------------------------------------------------------------------------------------------------

50

------------------------------------------------------------------------------------------------------------------------------------
                                              Safeco Intermediate-Term
                                                 Municipal Bond Fund                            Pioneer Tax Free Income Fund
------------------------------------------------------------------------------------------------------------------------------------
 Derivative instruments          Safeco Intermediate-Term Municipal Bond Fund           Pioneer Tax Free Income Fund may use
                                 may not purchase securities on margin.                 futures and options on securities, indices
                                 However, the Fund may (i) obtain short-term            and currencies, forward currency exchange
                                 credits as necessary to clear its purchases and        contracts and other derivatives. The Fund
                                 sales of securities, and (ii) make margin              does not use derivatives as a primary
                                 deposits in connection with its use of financial       investment technique and generally limits
                                 options and futures, forward and spot currency         their use to hedging. However, the Fund may
                                 contracts, swap transactions and other                 use derivatives for a variety of
                                 financial contracts or derivative instruments.         non-principal purposes, including:

                                                                                        o As a hedge against adverse changes in
                                                                                          stock market prices, interest rates or
                                                                                          currency exchange rates

                                                                                        o As a substitute for purchasing or
                                                                                          selling securities

                                                                                        o To increase the Fund's return as a
                                                                                          non- hedging strategy that may be
                                                                                          considered speculative
------------------------------------------------------------------------------------------------------------------------------------
 Other investment policies and   As described above, the Funds have substantially similar principal investment strategies and
 restrictions                    policies. Certain of the non-principal investment policies and restrictions are different. For a
                                 more complete discussion of each Fund's other investment policies and fundamental and non-
                                 fundamental investment restrictions, see the SAI.
------------------------------------------------------------------------------------------------------------------------------------
                                                            Buying, Selling and Exchanging Shares
------------------------------------------------------------------------------------------------------------------------------------
 Sales charges                   Purchases under $1,000,000 of Class A shares           The Investor Class shares of Pioneer Tax
                                 of the Fund are subject to a 3.50% front-end           Free Income Fund you receive in the
                                 sales charge.                                          Reorganization will not be subject to any
                                                                                        sales charge. Moreover, if you own shares
                                 Contingent deferred sales charge of up to 4%           in your own name as of the closing of the
                                 if you redeem Class B shares within five years         Reorganization (i.e., not in the name of a
                                 of purchase.                                           broker or other intermediary) or own shares
                                                                                        in the name of an omnibus account provider
                                 Contingent deferred sales charge of 1% if you          as of the closing of the Reorganization
                                 redeem Class C shares within one year of               that agrees with the Pioneer Fund to
                                 purchase.                                              distinguish beneficial holders in the same
                                                                                        manner and maintain your account, you may
                                 Purchases of Investor Class shares of the Fund         purchase Class A shares of Pioneer Tax Free
                                 are not subject to a sales load.                       Income Fund and Class A shares of any fund
                                                                                        in the Pioneer family of funds through such
                                 The Fund assesses a mandatory redemption               account in the future without paying any
                                 fee of 2%, as a percentage of the amount               sales charge.
                                 redeemed or exchanged, on Class A and
                                 Investor Class shares held less than 30 days.          Except as described above, Class A shares
                                                                                        of Pioneer Tax Free Income Fund are subject
                                                                                        to a front-end sales charge of up to 4.50%.
------------------------------------------------------------------------------------------------------------------------------------

51

------------------------------------------------------------------------------------------------------------------------------------
                                           Safeco Intermediate-Term
                                             Municipal Bond Fund                                 Pioneer Tax Free Income Fund
------------------------------------------------------------------------------------------------------------------------------------
 Management and other fees   Safeco Intermediate-Term Municipal Bond Fund               Pioneer Tax Free Income Fund pays Pioneer a
                             pays an advisory fee on a monthly basis at an              management fee equal to:
                             annual rate as follows:
                                                                                        0.50% of average daily net assets up to
                             $0-$250,000,000:                        0.50 of 1%          $250 million;
                             $250,000,001-$750,000,000:              0.45 of 1%         0.48% of the next $50 million; and
                             Over $750,000,000:                      0.40 of 1%         0.45% on assets over $300 million.

                             SAM serves as administrator and fund                       During its most recent fiscal year, Pioneer
                             accounting agent for the Fund. The Fund pays               Tax Free Income Fund paid an advisory fee
                             SAM an administrative services fee of 0.05%                at an average rate of 0.49% of average
                             of the Fund's average daily net assets up to the           daily net assets.
                             first $200,000,000 and 0.01% of its net assets
                             thereafter, and an accounting fee of 0.04% of              In addition, the Fund reimburses Pioneer
                             the Fund's average daily net assets up to the              for certain fund accounting and legal
                             first $200,000,000 and 0.01% of its net                    expenses incurred on behalf of the Fund and
                             assets thereafter.                                         pays a separate shareholder
                                                                                        servicing/transfer agency fee to PIMSS, an
                             During its most recent fiscal year, Safeco                 affiliate of Pioneer.
                             Intermediate-Term Municipal Bond Fund paid
                             aggregate advisory and administration fees at              For the fiscal year ended December 31,
                             an average rate of 0.59% of average daily                  2003, the Fund's total annual operating
                             net assets.                                                expenses for Class A shares were 0.93% of
                                                                                        average daily net assets. The Fund
                             SAM had contractually agreed until April 30,               currently does not have an expense
                             2009, to pay certain Fund operating expenses               limitation for its Class A shares.
                             (but not all of the operating expenses of the
                             Fund) that exceeded the rate of 0.40% per                  Pioneer has agreed until the second
                             annum of the Fund's average daily net assets.              anniversary of the closing of the
                             This arrangement included all Fund operating               Reorganization to limit the expenses
                             expenses except management fees, Rule 12b-1                (excluding extraordinary expenses) of the
                             fees, brokerage commissions, interest, and                 Investor Class to 0.70% of the average
                             extraordinary expenses.                                    daily net assets attributable to the
                                                                                        Investor Class.
                             In 2003, SAM began voluntarily reimbursing the
                             Fund to the extent that its total expenses                 The Investor Class shares to be issued in
                             exceeded the rate of 0.85% per annum of the                the Reorganization will convert to Class A
                             Fund's average daily net assets for Class A                shares after two years. Class A shares will
                             shares, 1.60% per annum for Class B and Class              have higher expenses per share than
                             C shares, and 0.70% per annum for Investor                 Investor Class shares due to the Rule 12b-1
                             Class shares.                                              Plan. In addition, although Pioneer has
                                                                                        agreed to limit the expenses attributable
                             For the fiscal year ended December 31, 2003,               to Investor Class shares, Pioneer is not
                             the Fund's annual operating expenses for Class             required to limit the expenses attributable
                             A shares, after giving effect to the contractual           to Class A shares.
                             expense limitation were 1.15%, and without
                             giving effect to the expense limitation, were
                             7.70%. After giving effect to the voluntary
                             expense reimbursement, the operating
                             expenses for Class A shares were 0.85%.
------------------------------------------------------------------------------------------------------------------------------------

52

------------------------------------------------------------------------------------------------------------------------------------
                                          Safeco Intermediate-Term
                                             Municipal Bond Fund                          Pioneer Tax Free Income Fund
------------------------------------------------------------------------------------------------------------------------------------
 Management and other fees   For the fiscal year ended December 31, 2003,
 (continued)                 the Fund's annual operating expenses for Class
                             B shares, after giving effect to the contractual
                             expense limitation were 1.90%, and without
                             giving effect to the expense limitation, were
                             16.43%. After giving effect to the voluntary
                             expense reimbursement, the operating
                             expenses for Class B shares were 1.60%.

                             For the fiscal year ended December 31, 2003,
                             the Fund's annual operating expenses for Class
                             C shares, after giving effect to the contractual
                             expense limitation were 1.90%, and without
                             giving effect to the expense limitation, were
                             20.82%. After giving effect to the voluntary
                             expense reimbursement, the operating
                             expenses for Class C shares were 1.60%.

                             For the fiscal year ended December 31, 2003,
                             the Fund's annual operating expenses for
                             Investor Class shares, after giving effect to the
                             contractual expense limitation were 0.90%, and
                             without giving effect to the expense limitation,
                             were 1.04%. After giving effect to the voluntary
                             expense reimbursement, the operating expenses
                             for Investor Class shares were 0.70%.
------------------------------------------------------------------------------------------------------------------------------------
 Distribution and service    Each class of shares of each Fund are not subject to a Rule 12b-1 fee. Pioneer Investor Class
 (12b-1) fee                 shares will convert into Class A shares after two years. Class A shares of each Fund are subject to
                             a Rule 12b-1 fee equal to 0.25% annually of average daily net assets.
------------------------------------------------------------------------------------------------------------------------------------
 Buying shares               You may buy shares of Safeco Intermediate-         You may buy shares from any investment firm
                             Term Municipal Bond Fund directly through          that has a sales agreement with PFD,
                             Safeco Securities, the Fund's principal            Pioneer Tax Free Income Fund's distributor.
                             underwriter or through brokers, registered         Existing shareholders of Safeco
                             investment advisers, banks and other financial     Intermediate-Term Municipal Bond Fund who
                             institutions that have entered into selling        own shares in their own name as of the
                             agreements with the Fund's principal               closing of the Reorganization (i.e., not in
                             underwriter, as described in the Fund's            the name of a broker or other intermediary)
                             prospectus.                                        or own shares in the name of an omnibus
                                                                                account provider as of the closing of the
                             Certain account transactions may be done           Reorganization that agrees with the Pioneer
                             by telephone.                                      Fund to distinguish beneficial holders in
                                                                                the same manner and who maintain their
                                                                                accounts may buy shares of any fund in the
                                                                                Pioneer family of funds through such
                                                                                accounts in the future without paying sales
                                                                                charges.

                                                                                If the account is established in the
                                                                                shareholder's own name, shareholders may
                                                                                also purchase additional shares of Pioneer
                                                                                Tax Free Income Fund by telephone or
                                                                                online.
------------------------------------------------------------------------------------------------------------------------------------

53

------------------------------------------------------------------------------------------------------------------------------------
                                   Safeco Intermediate-Term
                                      Municipal Bond Fund                            Pioneer Tax Free Income Fund
------------------------------------------------------------------------------------------------------------------------------------
 Exchange privilege   There are no sales charges on shares you                  You may exchange shares of Pioneer Tax Free
                      acquire through dividend reinvestment or other            Income Fund without incurring any fee on the
                      Fund distributions or for Class A shares that             exchange with the more than 62 other Pioneer
                      you have exchanged for Class A shares of                  Funds. Your exchange would be for Class A
                      another fund.                                             shares, which would be subject to Rule 12b-1
                                                                                fees. An exchange generally is treated as a
                      Certain account transactions may be done                  sale and a new purchase of shares for federal
                      by telephone.                                             income tax purposes.

                                                                                If the account is established in the
                                                                                shareholder's own name, shareholders may
                                                                                also exchange shares of Pioneer Tax Free
                                                                                Income Fund for shares of other Pioneer
                                                                                Funds by telephone or online.
------------------------------------------------------------------------------------------------------------------------------------
 Selling shares       Each class of shares will be sold at net asset value per share next calculated after the Fund
                      receives your request in good order.
------------------------------------------------------------------------------------------------------------------------------------
                      You may sell your shares by contacting Safeco             Normally, your investment firm will send
                      Intermediate-Term Municipal Bond Fund                     your request to sell shares to PIMSS. You
                      directly in writing or by contacting a financial          can also sell your shares by contacting the
                      intermediary as described in the Fund's                   Fund directly if your account is registered in
                      prospectus.                                               your name.

                                                                                If the account is established in the shareholder's
                                                                                own name, shareholders may also redeem
                                                                                shares of Pioneer Tax Free Income Fund by
                                                                                telephone or online.
------------------------------------------------------------------------------------------------------------------------------------

Comparison of Principal Risks of Investing in the Funds

Because each Fund has a similar investment objective, primary investment policies and strategies, the Funds are subject to the same principal risks. The market value of a fixed income security tends to be more volatile the longer the maturity of such security. Since Pioneer Tax Free Income Fund can invest in securities of longer maturity than your Safeco Fund, an investment in Pioneer Tax Free Income Fund may have correspondingly greater risks. You could lose money on your investment in either Fund or not make as much as if you invested elsewhere if:

o Interest rates go up, causing the value of debt securities in the Fund's portfolio to decline

o The issuer of a security owned by the Fund defaults on its obligation to pay principal and/or interest or has its credit rating downgraded

o New federal or state legislation adversely affects the tax-exempt status of securities held by the Fund or the financial ability of municipalities to repay these obligations

o The issuer of a security owned by the Fund may not be able to make timely payments because of a general economic downturn or increased governmental costs

o To the extent the Fund concentrates its investments in a single state or securities the payments on which are dependent upon a single industry, the Fund will be more susceptible to risks associated with that state or industry

o The Fund's investment adviser is incorrect in its expectation of changes in interest rates or the credit quality of an issuer

Although distributions of interest income from the Funds' tax-exempt securities are generally exempt from regular federal income tax, distributions from other sources, including capital gain distributions and any gains on the sale of your shares, are not. You should consult a tax adviser about whether an alternative minimum tax applies to you and about state and local taxes on Fund distributions.

54

The Investor Class shares to be issued in the Reorganization will convert to Class A shares after two years. Class A shares will have higher expenses per share than Investor Class shares due to the Rule 12b-1 Plan. In addition, although Pioneer has agreed to limit the expenses attributable to Investor Class shares, Pioneer is not required to limit the expenses attributable to Class A shares.

Past Performance

Set forth below is performance information for each Fund. The bar charts show how each Fund's total return (not including any deduction for sales charges) has varied from year to year for each full calendar year. The tables show average annual total return (before and after taxes) for each Fund over time for each class of shares (including deductions for sales charges) compared with a broad-based securities market index. The bar charts give an indication of the risks of investing in each Fund, including the fact that you could incur a loss and experience volatility of returns year to year. Past performance before and after taxes does not indicate future results.

Safeco Intermediate-Term Municipal Bond Fund -- Investor Class Calendar year total returns*

[TABULAR REPRESENTATION OF BAR CHART]

'94             -5.62
'95             15.22
'96              3.75
'97              7.50
'98              5.33
'99             -0.84
'00              7.44
'01              4.53
'02              8.89
'03              4.78

* During the period shown in the bar chart, your Safeco Fund's highest quarterly return was 6.25% for the quarter ended March 31, 1995, and the lowest quarterly return was -4.47% for the quarter ended March 31, 1994.

Pioneer Tax Free Income Fund -- Class A shares Calendar Year Total Returns*

[TABULAR REPRESENTATION OF BAR CHART]

'94             -6.38
'95             16.83
'96              3.57
'97              8.94
'98              6.20
'99             -4.29
'00             11.63
'01              4.13
'02              7.07
'03              5.80

* During the period shown in the bar chart, Pioneer Tax Free Income Fund's highest quarterly return was 7.11% for the quarter ended March 31, 1995, and the lowest quarterly return was -5.87% for the quarter ended March 31, 1994.

55

Safeco Intermediate-Term Municipal Bond Fund Average Annual Total Returns as of December 31, 2003

------------------------------------------------------------------------------------------------------
                                                                      1 Year      5 Years     10 Years
------------------------------------------------------------------------------------------------------
 Safeco Intermediate-Term Municipal Bond Fund, Class A shares
------------------------------------------------------------------------------------------------------
 Return Before Taxes                                                    0.94%       4.12%       4.57%
------------------------------------------------------------------------------------------------------
 Return After Taxes on Distributions(1)                                 0.85%       4.01%       4.51%
------------------------------------------------------------------------------------------------------
 Return After Taxes on Distributions and
  Sale of Fund Shares(1)                                                1.95%       4.05%       4.49%
------------------------------------------------------------------------------------------------------
 Safeco Intermediate-Term Municipal Bond Fund, Class B shares
------------------------------------------------------------------------------------------------------
 Return Before Taxes                                                   -0.11%       4.56%       4.87%
------------------------------------------------------------------------------------------------------
 Safeco Intermediate-Term Municipal Bond Fund, Class C shares
------------------------------------------------------------------------------------------------------
 Return Before Taxes                                                    2.89%       4.73%       4.87%
------------------------------------------------------------------------------------------------------
 Safeco Intermediate-Term Municipal Bond Fund, Investor Class shares
------------------------------------------------------------------------------------------------------
 Return Before Taxes                                                    4.78%       4.91%       4.96%
------------------------------------------------------------------------------------------------------
 Return After Taxes on Distributions(1)                                 4.69%       4.79%       4.90%
------------------------------------------------------------------------------------------------------
 Return After Taxes on Distributions and
  Sale of Fund Shares(1)                                                4.56%       4.75%       4.84%
------------------------------------------------------------------------------------------------------
 Lehman Brothers 7-Year Municipal Bond Index(2)
  (reflects no deduction for fees, expenses or taxes)                   5.45%       5.92%       5.86%
------------------------------------------------------------------------------------------------------

(1) After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your situation and may differ from those shown.
(2) The Lehman Brothers 7-Year Municipal Bond Index, an unmanaged index of bonds rated BAA3 or above, issued as part of a deal of at least $50 million, having an amount of at least $5 million and maturing in six or more years, is for reference only and does not mirror the Fund's investments.

Pioneer Tax Free Income Fund -- Class A shares Average Annual Total Returns as of December 31, 2003

                                                            1 Year      5 Years     10 Years
------------------------------------------------------------------------------------------------------
 Pioneer Tax Free Income Fund, Class A shares
------------------------------------------------------------------------------------------------------
 Return Before Taxes                                          1.01%       3.77%       4.66%
------------------------------------------------------------------------------------------------------
 Return After Taxes on Distributions(1)                       1.02%       3.66%       4.43%
------------------------------------------------------------------------------------------------------
 Return After Taxes on Distributions and
  Sale of Fund Shares(1)                                      2.30%       3.83%       4.55%
------------------------------------------------------------------------------------------------------
 Lehman Brothers Aggregate Bond Index(2)
  (reflects no deduction for fees, expenses or taxes)         5.31%       5.83%       6.03%
------------------------------------------------------------------------------------------------------

(1) After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your situation and may differ from those shown. Furthermore, the after-tax returns shown are not relevant to those who hold their shares through tax-deferred arrangements such as 401(k) plans or IRA accounts, or to investors that are tax-exempt.
(2) The Lehman Brothers Aggregate Bond Index, an unmanaged measure of approximately 15,000 municipal bonds with a minimum credit rating of BBB, and that were a part of at least a $50 million issuance made within the past fives years and have a maturity of at least two years, is for reference only and does not mirror the Fund's investments.

Pioneer Tax Free Income Fund's Investor Class shares will not be outstanding prior to the closing of the Reorganization and consequently have no performance history. However, the performance record of the Investor Class would be modestly higher than the performance of Class A shares due to the lower expenses applicable to the Investor Class shares.

The most recent portfolio manager's discussion of each Fund's performance is attached as Exhibit D.

56

The Funds' Fees and Expenses

Shareholders of both Funds pay various fees and expenses, either directly or indirectly. The tables below show the fees and expenses that you would pay if you were to buy and hold shares of each Fund. The expenses in the tables appearing below are based on (i) for your Safeco Fund, the expenses of your Safeco Fund for the period ended December 31, 2003 and (ii) for Pioneer Tax Free Income Fund, the expenses of Pioneer Tax Free Income Fund for the period ended December 31, 2003. Future expenses for all share classes may be greater or less.

                                                              Safeco         Safeco         Safeco         Safeco        Pro Forma
                                                          Intermediate-  Intermediate-  Intermediate-   Intermediate-   Pioneer Tax
                                                            Term Muni      Term Muni      Term Muni       Term Muni     Free Income
                                                            Bond Fund      Bond Fund      Bond Fund       Bond Fund    Fund Investor
Shareholder transaction fees                                 Class A        Class B        Class C     Investor Class     Class(9)
(paid directly from your investment)                      ------------- --------------- -------------- -------------- --------------
Maximum sales charge (load) when you buy shares as a
 percentage of offering price ............................     3.50%(6)        None           None           None           None(1)
Maximum deferred sales charge (load) as a percentage of
 purchase price or the amount you receive when you sell
 shares, whichever is less ...............................     None            4.00%(7)        1.00%(8)      None           None
Redemption fees for shares held less than 30 days ........     2.00%           None           None           2.00%          N/A
Wire redemption fee ......................................    $ 204           $ 204          $ 204          $ 204          $  10
Annual low balance fee ...................................    $ 125           $ 125          $ 125          $ 125            N/A
Annual fund operating expenses (deducted from fund assets)
 (as a % of average net assets)
Management fee ...........................................     0.50%           0.50%          0.50%          0.50%          0.49%
Distribution and service (12b-1) fee .....................     0.25%           1.00%          1.00%          None           None
Other expenses ...........................................     6.95%          14.93%         19.32%          0.54%          0.20%
Total fund operating expenses ............................     7.70%          16.43%         20.82%          1.04%          0.69%
Expense reimbursement/reduction ..........................     6.55%(2)       14.53%(2)       18.92%(2)      0.14%(2)       None(3)
Net fund operating expenses ..............................     1.15%           1.90%          1.90%          0.90%          0.69%


(1) No sales load will apply to shares received in the Reorganization by shareholders of your Safeco Fund who become shareholders of record of Pioneer Tax Free Income Fund through the Reorganization. In addition, shareholders of your Safeco Fund who own shares in their own name as of the closing of the Reorganization (i.e., not in the name of a broker or other intermediary) or own shares in the name of an omnibus account provider that agrees with the Pioneer Fund to distinguish beneficial holders in the same manner and who maintain their accounts may purchase Class A shares of Pioneer Tax Free Income Fund or of any fund in the Pioneer family of funds through such account in the future without paying this sales charge.

(2) As described above, SAM had contractually agreed to reimburse Safeco Intermediate-Term Municipal Bond Fund for certain operating expenses (but not all of the operating expenses of the Fund) that exceeded the rate of 0.40% per annum of the Fund's average daily net assets. This arrangement included all Fund operating expenses except management fees, Rule 12b-1 fees, brokerage commissions, interest, and extraordinary expenses. In 2003, SAM began voluntarily reimbursing the Fund to the extent that its total expenses exceeded the rate of 0.85% per annum of the Fund's average daily net assets for Class A shares, 1.60% per annum for Class B and Class C shares, and 0.70% per annum for Investor Class shares. The above table reflects "contractual" expense reimbursements from SAM, if any, but does not reflect "voluntary" expense reimbursements by SAM.
(3) Pioneer has agreed that through the second anniversary of the closing of the Reorganization, Pioneer will limit the expenses (excluding extraordinary expenses) of the Investor Class shares of Pioneer Tax Free Income Fund to 0.70% of average daily net assets.
(4) There is a higher charge for international wire redemptions, which may vary by country or dollar amount.
(5) A low balance fee is charged once in year in December for accounts with balances under $1,000 in your Safeco Fund.
(6) Purchases of $1,000,000 or more of Class A shares of your Safeco Fund are not subject to a front-end sales charge, but a 1.00% deferred sales charge will apply to redemptions made in the first twelve months except with respect to participant-directed redemptions from qualified retirement plans.
(7) The contingent deferred sales charge on Class B shares of your Safeco Fund reduces to zero after five years from purchase, and the Class B shares convert to Class A shares at that time.
(8) The contingent deferred sales charge on Class C shares applies only to redemptions made in the first twelve months after purchase.
(9) The Investor Class shares to be issued in the Reorganization will convert to Class A shares after two years. Class A shares will have higher expenses per share than Investor Class shares due to the Rule 12b-1 Plan. In addition, although Pioneer has agreed to limit the expenses attributable to Investor Class shares, Pioneer is not required to limit the expenses attributable to Class A shares. Class A shares do not currently have an expense limitation and may be subject to higher total operating expenses.

57

The hypothetical example below helps you compare the cost of investing in each Fund. It assumes that: (a) you invest $10,000 in each Fund for the time periods shown, (b) you reinvest all dividends and distributions, (c) your investment has a 5% return each year, (d) each Fund's gross operating expenses remain the same, (e) the expense limitations are in effect for five years for Safeco Intermediate-Term Municipal Bond Fund and two years for Pioneer Tax Free Income Fund and (f) and the Investor Class shares of Pioneer Tax Free Income Fund convert to Class A shares after two years. The examples are for comparison purposes only and are not a representation of either Fund's actual expenses or returns, either past or future.

Example

Safeco Intermediate-Term Municipal Bond Fund

Class A shares
Year 1 ..............                 $  463
Year 3 ..............                 $  703
Year 5 ..............                 $  961
Year 10 .............                 $1,804

Class B shares          With redemption      Without redemption
Year 1 ..............      $  593               $  193
Year 3 ..............      $  797               $  597
Year 5 ..............      $1,126               $1,026
Year 10 .............      $1,971               $1,971

Class C shares          With redemption      Without redemption
Year 1 ..............      $  293               $  193
Year 3 ..............      $  597               $  597
Year 5 ..............      $1,026               $1,026
Year 10 .............      $2,477               $2,477

Investor Class shares
Year 1 ..............                 $  92
Year 3 ..............                 $  287
Year 5 ..............                 $  498
Year 10 .............                 $1,200

Pro Forma Pioneer Tax Free Income Fund

Investor Class shares
Year 1 ..............                 $  71
Year 3 ..............                 $  246
Year 5 ..............                 $  460
Year 10 .............                 $1,079

Reasons for the Proposed Reorganization

The Trustees believe that the proposed Reorganization is in the best interests of Safeco Intermediate-Term Municipal Bond Fund. The Trustees considered the following matters, among others, in approving the proposal.

First, SAM, the investment adviser to the Fund until August 2, 2004, was acquired by Symetra. Symetra informed the Trustees that it did not intend to continue to provide investment advisory services to the Safeco Funds. Consequently, a change in your Safeco Fund's investment adviser was necessary.

Second, the historical investment performance of Pioneer Tax Free Income Safeco Fund and your Safeco Fund are comparable. For the one, five and ten year periods ended June 30, 2004, Class A shares of Pioneer Tax Free Income Fund had an average annual return of 1.55%, 4.84% and 5.53%, respectively, compared to an average annual return of the Class A shares and Investor Class shares of -3.82% and -0.27% (one year), 4.13% and 4.94% (five years) and 4.84% and 5.25% (ten years), respectively, during the same periods. In addition, the Trustees considered the track record of Pioneer in managing equity and fixed income mutual funds.

Third, the resources of Pioneer. At June 30, 2004, Pioneer managed over 62 investment companies and accounts with approximately $35 billion in assets. Pioneer is part of the global asset management group of UniCredito Italiano S.p.A., one of the largest banking groups in Italy, providing investment management and financial services to mutual funds, institutional and other clients. As of June 30, 2004,

58

assets under management of UniCredito Italiano S.p.A. were approximately $151 billion worldwide. Shareholders of your Safeco Fund would become part of a significantly larger family of funds that offers a more diverse array of investment options and enhanced shareholder account options. The Pioneer family of mutual funds offers over 62 funds, including domestic and international equity and fixed income funds and a money market fund that will be available to your Safeco Fund's shareholders through exchanges. In addition, Pioneer offers shareholders additional options for their accounts, including the ability to transact and exchange shares over the telephone or online and the ability to access account values and transaction history in all of the shareholder's direct accounts in the Pioneer Funds over the telephone or online.

Fourth, Pioneer Tax Free Income Fund's lower operating expenses and Pioneer's commitment until the second anniversary of the Reorganization to limit the expenses (excluding extraordinary expenses) of the Investor Class of Pioneer Tax Free Income Fund to 0.70% of average daily net assets. The estimated expenses of the Investor Class shares of Pioneer Tax Free Income Fund are below both the gross expenses and expenses net of expense reimbursement of each class of shares of your Safeco Fund. Although you will experience higher expenses once the Investor Class shares convert to Class A shares after two years, your expenses will remain the same until the second anniversary of the Reorganization.

Fifth, the substantially larger size of Pioneer Tax Free Income Fund offers greater opportunity for diversification of the investment portfolio, which should help to reduce risks.

Sixth, shareholders who own shares in their name as of the closing of the Reorganization (i.e., not in the name of a broker or other intermediary) and maintain their account may purchase additional Class A shares of the corresponding Pioneer Fund through such account in the future or may exchange those shares for Class A shares of another Pioneer Fund or purchase Class A share of another Pioneer Fund without paying any sales charge.

Seventh, the Trustees also considered the differences in the investment policies of the two Funds, particularly Pioneer Tax Free Income Fund's ability to invest in securities with longer maturities than your Safeco Fund. While this may result in Pioneer Tax Free Income Fund having greater volatility of net asset value than your Safeco Fund, the Trustees believe that the factors in favor of the Reorganization mitigate this risk.

Pioneer and Symetra will pay all out of pocket expenses of the Safeco Funds and the Pioneer Funds associated with the Reorganizations, including, but not limited to: (1) the expenses associated with the preparation, printing and mailing of any shareholder communications, including this joint Proxy Statement/Prospectus, and any filings with the SEC and other governmental authorities in connection with the Reorganizations; (2) the fees and expenses of any proxy solicitation firm retained in connection with the Reorganizations;
(3) the legal fees and expenses incurred by the Safeco Funds in connection with the Reorganizations; and (4) the Trustees' fees and out of pocket expenses incurred as a result of the Reorganizations.

The Trustees considered that Pioneer and Symetra will benefit from the Reorganization. See "Will Pioneer and Symetra Benefit from the Reorganizations."

The Board of Trustees of Pioneer Tax Free Income Fund also considered that the Reorganization presents an excellent opportunity for the Pioneer Tax Free Income Fund to acquire investment assets without the obligation to pay commissions or other transaction costs that a fund normally incurs when purchasing securities. This opportunity provides an economic benefit to Pioneer Tax Free Income Fund and its shareholders.

59

CAPITALIZATION

The following table sets forth the capitalization of each Fund, as of September 30, 2004, and the pro forma capitalization of the combined Fund as of September 30, 2004.

                                                   Safeco
                                              Intermediate-Term                                Pro Forma
                                                  Municipal          Pioneer Tax Free       Pioneer Tax Free
                                                  Bond Fund             Income Fund           Income Fund
                                             September 30, 2004     September 30, 2004     September 30, 2004
                                            --------------------   --------------------   -------------------
Total Net Assets (in thousands) .........           $11,586               $338,100               $349,686
 Class A shares .........................           $   333               $305,872               $305,872
 Class B shares .........................           $   155               $ 17,626               $ 17,626
 Class C shares .........................           $   109               $ 12,109               $ 12,109
 Investor Class shares ..................           $10,988                    N/A               $ 11,586
 Class Y shares .........................               N/A               $  2,494               $  2,494

Net Asset Value Per Share
 Class A shares .........................           $  11.04              $  11.56               $  11.56
 Class B shares .........................           $  11.03              $  11.45               $  11.45
 Class C shares .........................           $  11.03              $  11.38               $  11.56
 Investor Class shares ..................           $  11.04                   N/A               $  11.56
 Class Y shares .........................                N/A              $  11.50               $  11.50

Shares Outstanding
 Class A shares .........................            30,165             26,462,402             26,462,402
 Class B shares .........................            14,074              1,538,772              1,538,772
 Class C shares .........................             9,874              1,063,730              1,063,730
 Investor Class shares ..................           995,214                    N/A              1,002,249
 Class Y shares .........................               N/A                216,854                216,854

It is impossible to predict how many shares of Pioneer Tax Free Income Fund will actually be received and distributed by your Safeco Fund on the Reorganization date. The table should not be relied upon to determine the amount of Pioneer Tax Free Income Fund's shares that will actually be received and distributed.

BOARD'S EVALUATION AND RECOMMENDATION

For the reasons described above, the Trustees, including the Independent Trustees, approved the Reorganization. In particular, the Trustees determined that the Reorganization is in the best interests of your Safeco Fund. Similarly, the Board of Trustees of Pioneer Tax Free Income Fund, including its Independent Trustees, approved the Reorganization. They also determined that the Reorganization is in the best interests of Pioneer Tax Free Income Fund.

The Trustees recommend that the shareholders of your Safeco Fund vote FOR the proposal to approve the Agreement and Plan of Reorganization.

60

Safeco Intermediate-Term U.S. Government Fund and Pioneer America Income Trust

PROPOSAL 1(e)

Approval of Agreement and Plan of Reorganization

SUMMARY

The following is a summary of more complete information appearing later in this Proxy Statement/Prospectus or incorporated herein. You should read carefully the entire Proxy Statement/Prospectus, including the form of Agreement and Plan of Reorganization attached as EXHIBIT A-1, because it contains details that are not in the summary.

The Investor Class shares to be issued in the Reorganization will convert to Class A shares after two years. Class A shares will have higher expenses per share than Investor Class shares due to the Rule 12b-1 Plan. In addition, although Pioneer has agreed to limit the expenses attributable to Investor Class shares, Pioneer is not required to limit the expenses attributable to Class A shares.

In the table below, if a row extends across the entire table, the policy disclosed applies to both your Safeco Fund and the Pioneer Fund.

Comparison of Safeco Intermediate-Term U.S. Government Fund to Pioneer America Income Trust

------------------------------------------------------------------------------------------------------------------------------------
                                    Safeco Intermediate-Term
                                      U.S. Government Fund                        Pioneer America Income Trust
------------------------------------------------------------------------------------------------------------------------------------
 Business                  A series of Safeco Taxable Bond Trust, a         A diversified open-end management
                           diversified open-end management investment       investment company registered under the
                           company organized as a Delaware statutory        Investment Company Act and organized as a
                           trust.                                           Massachusetts business trust.
------------------------------------------------------------------------------------------------------------------------------------
 Net assets as of          $67 million                                      $204 million
 June 30, 2004
------------------------------------------------------------------------------------------------------------------------------------
 Investment advisers and   Investment adviser (until August 2, 2004):       Investment adviser:
 portfolio managers        SAM                                              Pioneer

                           Portfolio Managers (since 2003 and until         Portfolio Manager:
                           August 2, 2004):                                 Day-to-day management of the Fund's
                           Paul Stevenson                                   portfolio is the responsibility of a team of
                           CFA, Vice President, SAM                         fixed income portfolio managers led by
                           Joined SAM in 1988                               Kenneth J. Taubes.

                           Tim Hokari                                       Mr. Taubes joined Pioneer as a senior vice
                           Assistant Vice President, SAM                    president in September 1998 and has been
                           Joined SAM in 2000                               an investment professional since 1982.

                           Lesley Fox
                           Assistant Vice President, SAM
                           Joined SAM in 2000

                           Currently Pioneer is acting as investment
                           adviser to Safeco Intermediate-Term U.S.
                           Government Fund. The Portfolio Manager of
                           the Pioneer America Income Trust, as indicated
                           in the next column, currently manages your
                           Safeco Fund.
------------------------------------------------------------------------------------------------------------------------------------

61

------------------------------------------------------------------------------------------------------------------------------------
                                   Safeco Intermediate-Term
                                     U.S. Government Fund                            Pioneer America Income Trust
------------------------------------------------------------------------------------------------------------------------------------
 Investment objective   Safeco Intermediate-Term U.S. Government Fund        Pioneer America Income Trust seeks as high
                        seeks as high a level of current income as is        a level of current income as is consistent with
                        consistent with the preservation of capital by       the preservation of capital and prudent
                        investing in securities issued or guaranteed by      investment risk.
                        the U.S. government or its agencies or
                        instrumentalities.
------------------------------------------------------------------------------------------------------------------------------------
 Primary investments    Under normal circumstances, Safeco                   Pioneer America Income Trust invests
                        Intermediate-Term U.S. Government Fund               exclusively in securities that are backed by the
                        invests at least 80% of its net assets (plus any     full faith and credit of the U.S. government,
                        borrowings for investment purposes) in               and repurchase agreements and "when-
                        securities issued or guaranteed by the U.S.          issued" commitments with respect to these
                        government or its agencies and                       securities. These securities include:
                        instrumentalities.
                                                                             o U.S. Treasury obligations, which differ only in
                        U.S. government securities in which Safeco             their interest rates, maturities and times of
                        Intermediate-Term U.S. Government Fund                 issuance, including U.S. Treasury bills
                        invests include, but are not limited to:               (maturities of one year or less), U.S. Treasury
                                                                               notes (maturities of one to 10 years), and
                        o Mortgage-related securities backed by pools          U.S. Treasury bonds (generally maturities
                          of mortgages, including modified pass-               greater than 10 years)
                          through certificates and collateralized            o Obligations issued by or guaranteed as
                          mortgage obligations issued by the                   to principal and interest by the U.S. Treasury
                          Government National Mortgage Association             and certain agencies and instrumentalities of
                          (GNMA), the Federal Home Loan Mortgage               the U.S. government, such as Government
                          Corporation (FHLMC), and the Federal                 National Mortgage Association (GNMA)
                          National Mortgage Association (FNMA)                 certificates and Federal Housing
                        o U.S. Treasury bills, notes, bonds, and               Administration (FHA) debentures, for which
                          interest or principal components of Separate         the U.S. Treasury unconditionally guarantees
                          Trading Registered Interest and Principal            payment of principal and interest
                          Securities (STRIPS)
                        o Other U.S. government securities guaranteed        Pioneer America Income Trust's investments
                          by the full faith of the U.S. government but       may have all types of interest repayment and
                          not direct obligations of the U.S. Treasury.       reset terms, including fixed rate, adjustable
                        o Government-sponsored agency securities             rate, zero coupon, contingent, deferred,
                        o Securities issued by the Tennessee Valley          payment-in-kind and auction rate features.
                          Authority
                                                                             Pioneer America Income Trust may invest in
                        The average dollar weighted maturity of Safeco       securities of any maturity. Although the
                        Intermediate-Term U.S. Government Fund will          average dollar weighted maturity of the Fund's
                        generally range between three and ten years,         portfolio may vary significantly, it generally
                        although the maturity of individual securities may   will not exceed 20 years.
                        be out of that range.
------------------------------------------------------------------------------------------------------------------------------------

62

------------------------------------------------------------------------------------------------------------------------------------
                                        Safeco Intermediate-Term
                                          U.S. Government Fund                            Pioneer America Income Trust
------------------------------------------------------------------------------------------------------------------------------------
 Investment strategies    The decision to buy or sell securities in Safeco    Pioneer considers both broad economic
                          Intermediate-Term U.S. Government Fund              factors and issuer-specific factors in selecting
                          generally falls into one or more of the             a portfolio designed to achieve the Fund's
                          following categories:                               investment objective.

                          o To move in or out of various sectors based        In assessing the appropriate maturity and
                            upon their relative values                        rating weighting of Pioneer America Income
                          o To reduce the Fund's investments in sectors       Trust's portfolio, Pioneer considers a variety
                            viewed as overhauled, which increasing the        of factors that are expected to influence
                            Fund's investment in undervalued sectors          economic activity and interest rates. These
                          o To realign the overall maturity of duration of    factors include fundamental economic
                            the Fund's portfolio                              indicators such as the rates of economic
                          o To raise cash to meet shareholder                 growth and inflation, Federal Reserve monetary
                            redemptions                                       policy and the relative value of the U.S. dollar
                                                                              compared to other currencies. Once Pioneer
                          With each buy/sell decision, SAM also               determines the preferable portfolio
                          considered the effect the transaction may have      characteristics, Pioneer selects individual
                          on the performance of Safeco Intermediate-          securities based upon the terms of the
                          Term U.S. Government Fund's portfolio as            securities (such as yields compared to U.S.
                          a whole.                                            Treasuries or comparable issues), and sector
                                                                              diversification.
------------------------------------------------------------------------------------------------------------------------------------
 Other investments        Safeco Intermediate-Term U.S. Government            Pioneer America Income Trust may invest
                          Fund may invest in mortgage-backed or asset-        in mortgage-backed securities issued by
                          backed securities.                                  agencies or instrumentalities of the U.S.
                                                                              government. These securities represent direct
                          Safeco Intermediate-Term U.S. Government            or indirect participation in, or are collateralized
                          Fund may purchase "when-issued" or "delayed-        by and payable from, mortgage loans secured
                          delivery" securities, and may purchase or sell      by real estate.
                          securities on a "forward commitment" basis.
                                                                              Pioneer America Income Trust may purchase
                          Safeco Intermediate-Term U.S. Government            and sell securities, including GNMA
                          Fund may invest up to 20% of assets in              certificates, on a when-issued or delayed
                          foreign securities.                                 delivery basis. The Fund may engage in these
                                                                              transactions when it believes they would result
                                                                              in a favorable price and yield for the security
                                                                              being purchased or sold.
------------------------------------------------------------------------------------------------------------------------------------
 Temporary defensive      Safeco Intermediate-Term U.S. Government            Pioneer America Income Trust may invest all
 strategies               Fund may hold cash or invest in high-quality,       or part of its assets in securities with
                          short-term securities issued by an agency or        remaining maturities of less than one year,
                          instrumentality of the U.S. government, high-       cash equivalents or may hold cash.
                          quality commercial paper, certificates of deposit,
                          shares of no-load, open-end money market
                          funds, or repurchase agreements.
------------------------------------------------------------------------------------------------------------------------------------
 Diversification          Each Fund is diversified for the purpose of the Investment Company Act, and each Fund is
                          subject to diversification requirements under the Code.
------------------------------------------------------------------------------------------------------------------------------------
 Industry concentration   Safeco Intermediate-Term U.S. Government            Pioneer America Income Trust does not have
                          Fund may not invest more than 25% of its            a policy against industry concentration.
                          assets in any one industry.
------------------------------------------------------------------------------------------------------------------------------------

63

------------------------------------------------------------------------------------------------------------------------------------
                                        Safeco Intermediate-Term
                                          U.S. Government Fund                               Pioneer America Income Trust
------------------------------------------------------------------------------------------------------------------------------------
 Restricted and illiquid     If immediately after and as a result of such               Pioneer America Income Trust will not
 securities                  action the value of the following securities, in           invest more than 15% of its net assets in
                             the aggregate, would exceed 15% of Safeco                  illiquid and other securities that are not
                             Intermediate-Term U.S. Government Fund's net               readily marketable. Repurchase agreements
                             assets, the Fund will not (i) purchase securities          maturing in more than seven days will be
                             for which there is no readily available market,            included for purposes of the foregoing
                             (ii) purchase time deposits maturing in more               limit. Securities subject to restrictions
                             than seven days, (iii) purchase over-the-counter           on resale under the 1933 Act are considered
                             (OTC) options or hold assets set aside to cover            illiquid unless they are eligible for
                             OTC options written by the Fund, (iv) enter into           resale pursuant to Rule 144A or another
                             repurchase agreements maturing in more than                exemption from the registration
                             seven days, or (v) invest in interests in real             requirements of the 1933 Act and are
                             estate investment trusts which are not readily             determined to be liquid by Pioneer.
                             marketable or interests in real estate limited
                             partnerships which are not listed or traded on
                             the NASDAQ Stock Market.
------------------------------------------------------------------------------------------------------------------------------------
 Borrowing                   Safeco Intermediate-Term U.S. Government                   Pioneer America Income Trust may not borrow
                             Fund may borrow money (i) from banks or (ii)               money, except from banks to meet
                             by engaging in reverse repurchase agreements.              redemptions in amounts not exceeding 33 1/3%
                                                                                        (taken at the lower of cost or current
                                                                                        value) of its total assets (including the
                                                                                        amount borrowed). The Fund does not intend
                                                                                        to borrow money during the coming year, and
                                                                                        will do so only as a temporary measure for
                                                                                        extraordinary purposes or to facilitate
                                                                                        redemptions. The Fund will not purchase
                                                                                        securities while any borrowings are
                                                                                        outstanding.
------------------------------------------------------------------------------------------------------------------------------------
 Lending                     Safeco Intermediate-Term U.S. Government                   Pioneer America Income Trust may not make
                             Fund may lend securities to qualified                      loans, except through the purchase of
                             institutional investors with a value of up to 33%          securities, including repurchase
                             of the Fund's total assets.                                agreements, in accordance with its
                                                                                        investment objective, policies and
                                                                                        limitations.
------------------------------------------------------------------------------------------------------------------------------------
 Derivative instruments      Safeco Intermediate-Term U.S. Government                   Pioneer America Income Trust may not
                             Fund may not purchase securities on margin.                purchase securities on margin.
                             However, the Fund may (i) obtain short-term
                             credits as necessary to clear its purchases and
                             sales of securities, and (ii) make margin
                             deposits in connection with its use of financial
                             options and futures, forward and spot currency
                             contracts, swap transactions and other financial
                             contracts or derivative instruments.
------------------------------------------------------------------------------------------------------------------------------------
 Other investment policies   As described above, the Funds have substantially similar principal investment strategies and
 and restrictions            policies. Certain of the non-principal investment policies and restrictions are different. For a
                             more complete discussion of each Fund's other investment policies and fundamental and non-
                             fundamental investment restrictions, see the SAI.
------------------------------------------------------------------------------------------------------------------------------------

64

------------------------------------------------------------------------------------------------------------------------------------
                                          Safeco Intermediate-Term
                                            U.S. Government Fund                             Pioneer America Income Trust
------------------------------------------------------------------------------------------------------------------------------------
                                                                                        Buying, Selling and Exchanging Shares
------------------------------------------------------------------------------------------------------------------------------------
 Sales charges               Purchases under $1,000,000 of Class A shares
                             of the Fund are subject to a 3.50% front-end               The Investor Class shares of Pioneer
                             sales charge.                                              America Income Trust you receive in the
                                                                                        Reorganization will not be subject to any
                             Contingent deferred sales charge of up to 4%               sales charge. Moreover, if you own shares
                             if you redeem Class B shares within five years             in your own name as of the closing of the
                             of purchase.                                               Reorganization (i.e., not in the name of a
                                                                                        broker or other intermediary) or own shares
                             Contingent deferred sales charge of 1% if you              in the name of an omnibus account provider
                             redeem Class C shares within one year of                   as of the closing of the Reorganization
                             purchase.                                                  that agrees with the Pioneer Fund to
                                                                                        distinguish beneficial holders in the same
                             Purchases of Investor Class shares of the Fund             manner and maintain your account, you may
                             are not subject to a sales load.                           purchase Class A shares of Pioneer America
                                                                                        Income Trust and Class A shares of any fund
                             Safeco Intermediate-Term U.S. Government                   in the Pioneer family of funds through such
                             Fund assesses a mandatory redemption fee of                account in the future without paying any
                             2%, as a percentage of the amount redeemed                 sales charge.
                             or exchanged, on Class A and Investor Class
                             shares held less than 30 days.                             Except as described above, Class A shares
                                                                                        of Pioneer America Income Trust are subject
                                                                                        to a front-end sales charge of up to 4.50%.

------------------------------------------------------------------------------------------------------------------------------------
 Management and other fees   Safeco Intermediate-Term U.S. Government                   Pioneer America Income Trust pays Pioneer a
                             Fund pays an advisory fee on a monthly basis               management fee equal to 0.50% of the Fund's
                             at an annual rate as follows:                              average daily net assets.

                             $0-$250,000,000:                        0.55 of 1%         During its most recent fiscal year, Pioneer
                             $250,000,001-$750,000,000:              0.50 of 1%         America Income Trust paid an advisory fee
                             $750,000,001-$1,250,000,000:            0.45 of 1%         at an average rate of 0.50% of average
                             Over $1,250,000,000:                    0.40 of 1%         daily net assets.

                             SAM serves as administrator and fund                       In addition, the Fund reimburses Pioneer
                             accounting agent for Safeco Intermediate-Term              for certain fund accounting and legal
                             U.S. Government Fund. The Fund pays SAM an                 expenses incurred on behalf of the Fund and
                             administrative services fee of 0.05% of the                pays a separate shareholder
                             Fund's average daily net assets up to the first            servicing/transfer agency fee to PIMSS, an
                             $200,000,000 and 0.01% of its net assets                   affiliate of Pioneer.
                             thereafter, and an accounting fee of 0.04% of
                             the Fund's average daily net assets up to the              For the fiscal year ended December 31,
                             first $200,000,000 and 0.01% of its net assets             2003, the Fund's total annual operating
                             thereafter.                                                expenses for Class A shares were 1.12% of
                                                                                        average daily net assets. The Fund does not
                             During its most recent fiscal year, Safeco                 currently have an expense limitation for
                             Intermediate-Term U.S. Government Fund paid                its Class A shares.
                             aggregate advisory and administration fees at
                             an average rate of 0.64%of average daily                   Pioneer has agreed until the second
                             net assets.                                                anniversary of the closing of the
                                                                                        Reorganization to limit the expenses
                             SAM had contractually agreed until April                   (excluding extraordinary expenses) of the
                             30,2009, to pay certain Fund operating                     Investor Class to 0.74% of the average
                             expenses (but not all of the operating expenses            daily net assets attributable to the
                                                                                        Investor Class.

                                                                                        The Investor Class shares to be issued in
                                                                                        the Reorganization will convert to Class A
                                                                                        shares after two years. Class A shares will
                                                                                        have
------------------------------------------------------------------------------------------------------------------------------------

65

------------------------------------------------------------------------------------------------------------------------------------
                                          Safeco Intermediate-Term
                                            U.S. Government Fund                         Pioneer America Income Trust
------------------------------------------------------------------------------------------------------------------------------------
 Management and other fees   of the Fund) that exceeded the rate of 0.40%      higher expenses per share than Investor
 (continued)                 per annum of the Fund's average daily net         Class shares due to the Rule 12b-1 Plan. In
                             assets. This arrangement included all Fund        addition, although Pioneer has agreed to limit
                             operating expenses except management fees,        the expenses attributable to Investor Class
                             Rule 12b-1 fees, brokerage commissions,           shares, Pioneer is not required to limit the

                             interest, and extraordinary expenses.             expenses attributable to Class A shares.
                             In 2003, SAM began voluntarily reimbursing the
                             Fund to the extent that its total expenses
                             exceeded the rate of 0.99% per annum of the
                             Fund's average daily net assets for Class A
                             shares, 1.74% per annum of Class B and Class C
                             shares, and 0.74% per annum for Investor Class
                             shares.

                             For the fiscal year ended December 31, 2003,
                             the Fund's annual operating expenses for Class
                             A shares, after giving effect to the contractual
                             expense limitation were 1.20%, and without
                             giving effect to the expense limitation, were
                             1.31%. After giving effect to the voluntary
                             expense reimbursement, the operating
                             expenses for Class A shares were 0.99%.

                             For the fiscal year ended December 31, 2003,
                             the Fund's annual operating expenses for Class
                             B shares, after giving effect to the contractual
                             expense limitation were 1.95%, and without
                             giving effect to the expense limitation, were
                             2.10%. After giving effect to the voluntary
                             expense reimbursement, the operating
                             expenses for Class B shares were 1.74%.

                             For the fiscal year ended December 31, 2003,
                             the Fund's annual operating expenses for Class
                             C shares, after giving effect to the contractual
                             expense limitation were 1.95%, and without
                             giving effect to the expense limitation, were
                             43.56%. After giving effect to the voluntary
                             expense reimbursement, the operating
                             expenses for Class C shares were 1.74%.

                             For the fiscal year ended December 31, 2003,
                             the Fund's annual operating expenses for
                             Investor Class shares were 0.94% per share.
                             After giving effect to the voluntary expense
                             reimbursement, the operating expenses for
                             Investor Class shares were 0.74%.
------------------------------------------------------------------------------------------------------------------------------------
 Distribution and service    Investor Class shares of each Fund are not subject to a Rule 12b-1 fee. Pioneer Investor Class
 (12b-1) fee                 shares will convert into Class A shares after two years. Class A shares of each Fund are subject
                             to a Rule 12b-1 fee equal to 0.25% annually of average daily net assets.
------------------------------------------------------------------------------------------------------------------------------------

66

------------------------------------------------------------------------------------------------------------------------------------
                                   Safeco Intermediate-Term
                                     U.S. Government Fund                            Pioneer America Income Trust
------------------------------------------------------------------------------------------------------------------------------------
 Buying shares        You may buy shares of Safeco Intermediate-         You may buy shares from any investment firm
                      Term U.S. Government Fund directly through         that has a sales agreement with PFD, Pioneer
                      Safeco Securities, the Fund's principal            America Income Trust's distributor. Existing
                      underwriter or through brokers, registered         shareholders of Safeco Intermediate-Term U.S.
                      investment advisers, banks and other financial     Government Fund who own shares in their
                      institutions that have entered into selling        own name as of the closing of the
                      agreements with the Fund's principal               Reorganization (i.e., not in the name of a
                      underwriter, as described in the Fund's            broker or other intermediary) or own shares in
                      prospectus.                                        the name of an omnibus account provider as
                                                                         of the closing of the Reorganization that
                      Certain account transactions may be done           agrees with the Pioneer Fund to distinguish
                      by telephone.                                      beneficial holders in the same manner and
                                                                         who maintain their accounts may buy shares
                                                                         of any fund in the Pioneer family of funds
                                                                         through such accounts in the future without
                                                                         paying sales charges.

                                                                         If the account is established in the
                                                                         shareholder's own name, shareholders may
                                                                         also purchase additional shares of Pioneer
                                                                         America Income Trust by telephone or online.
------------------------------------------------------------------------------------------------------------------------------------
 Exchange privilege   There are no sales charges on shares you           You may exchange shares of Pioneer America
                      acquire through dividend reinvestment or other     Income Trust without incurring any fee on the
                      Fund distributions or for Class A shares that      exchange with the more than 62 other Pioneer
                      you have exchanged for Class A shares of           Funds. Your exchange would be for Class A
                      another fund.                                      shares, which would be subject to a Rule
                                                                         12b-1 fee. An exchange generally is treated
                      Certain account transactions may be done           as a sale and a new purchase of shares for
                      by telephone.                                      federal income tax purposes.

                                                                         If the account is established in the
                                                                         shareholder's own name, shareholders may
                                                                         also exchange shares of Pioneer America
                                                                         Income Trust for shares of other Pioneer
                                                                         Funds by telephone or online.
------------------------------------------------------------------------------------------------------------------------------------
 Selling shares       Each class of shares will be sold at net asset value per share next calculated after the Fund
                      receives your request in good order.
------------------------------------------------------------------------------------------------------------------------------------
                      You may sell your shares by contacting Safeco      Normally, your investment firm will send
                      Intermediate-Term U.S. Government Fund             your request to sell shares to PIMSS. You
                      directly in writing or by contacting a financial   can also sell your shares by contacting the
                      intermediary as described in the Fund's            Fund directly if your account is registered in
                      prospectus.                                        your name.

                                                                         If the account is established in the shareholder's
                                                                         own name, shareholders may also redeem
                                                                         shares of Pioneer America Income Trust by
                                                                         telephone or online.
------------------------------------------------------------------------------------------------------------------------------------

67

Comparison of Principal Risks of Investing in the Funds

While each Fund has a similar investment objective, primary investment policies and strategies, there are differences which affect the risk of each Fund. The market value of fixed income securities tends to be more volatile the greater the maturity of the security. Pioneer America Income Trust can invest in securities of greater average maturity than your Safeco Fund and consequently may have greater risk. However, your Safeco Fund may invest in U.S. government securities that are not backed by the full faith and credit of the U.S. Treasury, and consequently have an element of credit risk that is not present in Pioneer America Income Trust. Generally, however, the Funds are subject to the same principal risks. You could lose money on your investment in either Fund or not make as much as if you invested elsewhere if:

o Interest rates go up, causing the value of debt securities in the Fund's portfolio to decline
o During periods of declining interest rates, the issuer of a security may exercise its option to prepay principal earlier than scheduled, forcing the Fund to reinvest in lower yielding securities. This is known as call or prepayment risk
o During periods of rising interest rates, the average life of certain types of securities may be extended because of slower than expected principal payments. This may lock in a below market interest rate, increase the security's duration (the estimated period until the security is paid in full) and reduce the value of the security. This is known as extension risk
o Pioneer's judgment about the attractiveness, relative value or potential appreciation of a particular sector, security or investment strategy proves to be incorrect

To the extent the Fund invests significantly in mortgage-backed securities, its exposure to prepayment and extension risks may be greater than other investments in fixed income securities.

Although mortgage pools issued by U.S. agencies are guaranteed with respect to payments of principal and interest, such guarantee does not apply to losses resulting from declines in the market value of such securities.

The Investor Class shares to be issued in the Reorganization will convert to Class A shares after two years. Class A shares will have higher expenses per share than Investor Class shares due to the Rule 12b-1 Plan. In addition, although Pioneer has agreed to limit the expenses attributable to Investor Class shares, Pioneer is not required to limit the expenses attributable to Class A shares.

Past Performance

Set forth below is performance information for each Fund. The bar charts show how each Fund's total return (not including any deduction for sales charges) has varied from year to year for each full calendar year. The tables show average annual total return (before and after taxes) for each Fund over time for each class of shares (including deductions for sales charges) compared with a broad-based securities market index. The bar charts give an indication of the risks of investing in each Fund, including the fact that you could incur a loss and experience volatility of returns year to year. Past performance before and after taxes does not indicate future results.

Safeco Intermediate-Term U.S. Government Fund -- Investor Class Calendar Year Total Returns*

[TABULAR REPRESENTATION OF BAR CHART]

'94     -4.27%
'95     15.48
'96      3.98
'97      8.97
'98      6.84
'99      0.16
'00      9.50
'01      7.29
'02      9.84
'03      1.40

* During the period shown in the bar chart, your Safeco Fund's highest quarterly return was 4.79% for the quarter ended March 31, 1995, and the lowest quarterly return was -3.58% for the quarter ended March 31, 1994.

68

Pioneer America Income Trust -- Class A shares Calendar Year Total Returns*

[TABULAR REPRESENTATION OF BAR CHART]

'94     -3.97%
'95     16.07
'96      2.29
'97      8.51
'98      7.78
'99     -2.52
'00     11.58
'01      5.92
'02      9.78
'03      1.47

* During the period shown in the bar chart, the Fund's highest quarterly return was 4.72% for the quarter ended June 30, 1995, and the lowest quarterly return was -3.14% for the quarter ended March 31, 1994.

Safeco Intermediate-Term U.S. Government Fund Average Annual Total Returns as of December 31, 2003

-----------------------------------------------------------------------------------------------------
                                                                     1 Year      5 Years     10 Years
-----------------------------------------------------------------------------------------------------
 Safeco Intermediate-Term U.S. Government Fund, Class A shares
-----------------------------------------------------------------------------------------------------
 Return Before Taxes                                                  -2.41%       4.60%       5.30%
-----------------------------------------------------------------------------------------------------
 Return After Taxes on Distributions(1)                               -3.81%       2.47%       2.93%
-----------------------------------------------------------------------------------------------------
 Return After Taxes on Distributions and Sale of Fund Shares(1)       -1.57%       2.58%       2.99%
-----------------------------------------------------------------------------------------------------
 Safeco Intermediate-Term U.S. Government Fund, Class B shares
-----------------------------------------------------------------------------------------------------
 Return Before Taxes                                                  -3.50%       4.62%       5.39%
-----------------------------------------------------------------------------------------------------
 Safeco Intermediate-Term U.S. Government Fund, Class C shares
-----------------------------------------------------------------------------------------------------
 Return Before Taxes                                                  -0.49%       4.81%       5.40%
-----------------------------------------------------------------------------------------------------
 Safeco Intermediate-Term U.S. Government Fund, Investor Class shares
-----------------------------------------------------------------------------------------------------
 Return Before Taxes                                                   1.40%       5.56%       5.78%
-----------------------------------------------------------------------------------------------------
 Return After Taxes on Distributions(1)                               -0.14%       3.34%       3.36%
-----------------------------------------------------------------------------------------------------
 Return After Taxes on Distributions and Sale of Fund Shares(1)        0.91%       3.34%       3.39%
-----------------------------------------------------------------------------------------------------
 Lehman Brothers Intermediate Government Index(2)
  (reflects no deduction for fees, expenses or taxes)                  2.30%       6.16%       6.33%
-----------------------------------------------------------------------------------------------------
 Merrill Lynch U.S. Treasury/Agency Master Index(2)
  (reflects no deduction for fees, expenses or taxes)                  2.36%       6.22%       6.71%
-----------------------------------------------------------------------------------------------------

(1) After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your situation and may differ from those shown. Furthermore, the after-tax returns shown are not relevant to those who hold their shares through tax-deferred arrangements such as 401(k) plans or IRA accounts, or to investors that are tax-exempt.
(2) The Lehman Brothers Intermediate Government Index, an unmanaged index comprised of U.S. Treasury and U .S. agency issues from its more comprehensive U.S. Aggregate Index, excluding maturities below one year and above 9.9 years, and the Merrill Lynch U.S. Treasury/Agency Master Index, an unmanaged index of U.S. Treasury and U.S. agency securities, are for reference only and do not mirror the Fund's investments.

69

Pioneer America Income Trust -- Class A shares Average Annual Total Returns as of December 31, 2003

-----------------------------------------------------------------------------------------------------
                                                                     1 Year      5 Years     10 Years
-----------------------------------------------------------------------------------------------------
 Pioneer America Income Trust, Class A shares
-----------------------------------------------------------------------------------------------------
 Return Before Taxes                                                  -3.06%       4.14%       5.04%
-----------------------------------------------------------------------------------------------------
 Return After Taxes on Distributions(1)                               -4.61%       2.05%       2.65%
-----------------------------------------------------------------------------------------------------
 Return After Taxes on Distributions and Sale of Fund Shares(1)       -2.00%       2.20%       2.75%
-----------------------------------------------------------------------------------------------------
 Lehman Brothers Government Bond Index(2)
  (reflects no deduction for fees, expenses or taxes)                  2.36%       6.26%       6.72%
-----------------------------------------------------------------------------------------------------
 Lehman Brothers Fixed Rate Mortgage-Backed Securities Index(2)
  (reflects no deduction for fees, expenses or taxes)                  3.05%       6.55%       6.89%
-----------------------------------------------------------------------------------------------------

(1) After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your situation and may differ from those shown. Furthermore, the after-tax returns shown are not relevant to those who hold their shares through tax-deferred arrangements such as 401(k) plans or IRA accounts, or to investors that are tax-exempt.
(2) The Lehman Brothers Government Bond Index, an unmanaged measure of the performance of U.S. Treasury debt, all publicly issued debt of U.S. government agencies and quasi-federal corporations, and corporate debt guaranteed by the U.S. government, and the Lehman Brothers Fixed Rate Mortgage-Backed Securities Index, an unmanaged index including 15- and 30-year fixed rate securities backed by mortgage pools of the GNMA, FHLMC and FNMA, are for reference only and do not mirror the Fund's investments.

Pioneer America Income Trust's Investor Class shares will not be outstanding prior to the closing of the Reorganization and consequently have no performance history. However, the performance record of the Investor Class would be modestly higher than the performance of Class A shares due to the lower expenses applicable to the Investor Class.

The most recent portfolio manager's discussion of each Fund's performance is attached as Exhibit D.

The Funds' Fees and Expenses

Shareholders of both Funds pay various fees and expenses, either directly or indirectly. The tables below show the fees and expenses that you would pay if you were to buy and hold shares of each Fund. The expenses in the tables appearing below are based on (i) for your Safeco Fund, the expenses of your Safeco Fund for the period ended December 31, 2003 and (ii) for Pioneer America Income Trust, the expenses of Pioneer America Income Trust for the period ended December 31, 2003. Future expenses for all share classes may be greater or less.

                                                                                                            Safeco
                                                             Safeco          Safeco         Safeco      Intermediate-    Pro Forma
                                                         Intermediate-   Intermediate-  Intermediate-     Term U.S.       Pioneer
                                                           Term U.S.       Term U.S.      Term U.S.       Government      America
                                                           Government      Government     Government         Fund       Income Trust
                                                              Fund            Fund           Fund          Investor       Investor
Shareholder transaction fees                                Class A         Class B        Class C          Class          Class(9)
(paid directly from your investment)                    --------------- --------------- -------------- --------------- -------------
Maximum sales charge (load) when you buy shares as a
 percentage of offering price .........................        3.50%(6)        None           None            None           None1
Maximum deferred sales charge (load) as a percentage of
 purchase price or the amount you receive when you sell
 shares, whichever is less ............................        None            4.00%(7)       1.00%(8)        None           None
Redemption fees for shares held less than 30 days .....        2.00%           None           None            2.00%           N/A
Wire redemption fee ...................................       $ 204           $ 204          $ 204           $ 204          $  10
Annual low balance fee ................................       $ 125           $ 125          $ 125           $ 125            N/A

70

                                                                                                 Safeco
                                                 Safeco          Safeco          Safeco      Intermediate-    Pro Forma
                                             Intermediate-   Intermediate-   Intermediate-     Term U.S.       Pioneer
                                               Term U.S.       Term U.S.       Term U.S.       Government      America
                                               Government      Government      Government         Fund       Income Trust
                                                  Fund            Fund            Fund          Investor       Investor
Shareholder transaction fees                    Class A         Class B         Class C          Class          Class(9)
(paid directly from your investment)        --------------- --------------- --------------- --------------- -------------
Annual fund operating expenses (deducted from fund assets)
 (as a % of average net assets)
Management fee ............................       0.55%           0.55%            0.55%           0.55%         0.50%
Distribution and service (12b-1) fee ......       0.25%           1.00%            1.00%           None          None
Other expenses ............................       0.51%           0.55%           42.01%           0.39%         0.35%
Total fund operating expenses .............       1.31%           2.10%           43.56%           0.94%         0.85%
Expense reimbursement/reduction ...........       0.11%(2)        0.15%(2)        41.61%(2)         N/A          0.11%(3)
Net fund operating expenses ...............       1.20%           1.95%            1.95%           0.94%         0.74%


(1) No sales load will apply to shares received in the Reorganization by shareholders of your Safeco Fund who become shareholders of record of Pioneer America Income Trust through the Reorganization. In addition, shareholders of your Safeco Fund who own shares in their own name as of the closing of the Reorganization (i.e., not in the name of a broker or other intermediary) or own shares in the name of an omnibus account provider that agrees with the Pioneer Fund to distinguish beneficial holders in the same manner and who maintain their accounts may purchase Class A shares of Pioneer America Income Trust or of any fund in the Pioneer family of funds through such account in the future without paying this sales charge.

(2) As described above, SAM had contractually agreed to reimburse Safeco Intermediate-Term U.S. Government Bond Fund for certain Fund operating expenses (but not all of the operating expenses of the Fund) that exceeded the rate of 0.40% per annum of the Fund's average daily net assets. This arrangement included all Fund operating expenses except management fees, Rule 12b-1 fees, brokerage commissions, interest, and extraordinary expenses. In 2003, SAM began voluntarily reimbursing the Fund to the extent that its total expenses exceeded the rate of 0.99% per annum of the Fund's average daily net assets for Class A shares, 1.74% per annum for Class B and Class C shares, and 0.74% per annum for Investor Class shares. The above table reflects "contractual" expense reimbursements from SAM, if any, but does not reflect "voluntary" expense reimbursements by SAM.
(3) Pioneer has agreed that through the second anniversary of the closing of the Reorganization, Pioneer will limit the expenses (excluding extraordinary expenses) of the Investor Class shares of Pioneer America Income Trust to 0.74% of average daily net assets.
(4) There is a higher charge for international wire redemptions, which may vary by country or dollar amount.
(5) A low balance fee is charged once in year in December for accounts with balances under $1,000 in your Safeco Fund.
(6) Purchases of $1,000,000 or more of Class A shares of your Safeco Fund are not subject to a front-end sales charge, but a 1.00% deferred sales charge will apply to redemptions made in the first twelve months except with respect to participant-directed redemptions from qualified retirement plans.
(7) The contingent deferred sales charge on Class B shares of your Safeco Fund reduces to zero after five years from purchase, and the Class B shares convert to Class A shares at that time.
(8) The contingent deferred sales charge on Class C shares applies only to redemptions made in the first twelve months after purchase.
(9) The Investor Class shares to be issued in the Reorganization will convert to Class A shares after two years. Class A shares will have higher expenses per share than Investor Class shares due to the Rule 12b-1 Plan. In addition, although Pioneer has agreed to limit the expenses attributable to Investor Class shares, Pioneer is not required to limit the expenses attributable to Class A shares.

The hypothetical example below helps you compare the cost of investing in each Fund. It assumes that: (a) you invest $10,000 in each Fund for the time periods shown, (b) you reinvest all dividends and distributions, (c) your investment has a 5% return each year, (d) each Fund's gross operating expenses remain the same, (e) the expense limitations are in effect for five years for Safeco Intermediate-Term U.S. Government Fund and two years for Pioneer America Income Trust and (f) and the Investor Class shares of Pioneer America Income Trust convert to Class A shares after two years. The examples are for comparison purposes only and are not a representation of either Fund's actual expenses or returns, either past or future.

71

Example

Safeco Intermediate-Term U.S. Government Fund

Class A shares
Year 1 ..............                $  468
Year 3 ..............                $  718
Year 5 ..............                $  987
Year 10 .............                $1,822

Class B shares          With redemption      Without redemption
Year 1 ..............      $  598               $  198
Year 3 ..............      $  812               $  612
Year 5 ..............      $1,152               $1,052
Year 10 .............      $1,974               $1,974

Class C shares          With redemption      Without redemption
Year 1 ..............      $  298               $  198
Year 3 ..............      $  612               $  612
Year 5 ..............      $1,052               $1,052
Year 10 .............      $2,399               $2,399

Investor Class shares
Year 1 ..............                $  96
Year 3 ..............                $  300
Year 5 ..............                $  520
Year 10 .............                $1,155

Pro Forma Pioneer America Income Trust

Investor Class shares
Year 1 ..............                $  76
Year 3 ..............                $  284
Year 5 ..............                $  558
Year 10 .............                $1,341

COMPARISON OF DELAWARE STATUTORY TRUST AND MASSACHUSETTS BUSINESS TRUST

Characteristics of Safeco Intermediate-Term U.S. Government Trust (a series of a Delaware statutory trust)

o GOVERNANCE AND MANAGEMENT. Safeco Intermediate-Term U.S. Government Fund is a series of the Safeco Taxable Bond Trust, a Delaware statutory trust. The governing instrument of Safeco Taxable Bond Trust is its Trust Instrument (the "Trust Instrument"). The Trustees of the Safeco Taxable Bond Trust are responsible for the management and supervision of Safeco Intermediate-Term U.S. Government Fund.

o SHARE CAPITAL AND CLASSES. The Trust Instrument of Safeco Taxable Bond Trust permits the Trustees to issue an unlimited number of full and fractional shares of beneficial interest of Safeco Intermediate-Term U.S. Government Fund without par value. As of the date of this Proxy Statement/Prospectus, the Trustees have authorized shares of Safeco Intermediate-Term U.S. Government Fund and have authorized the issuance of four classes of shares of Safeco Intermediate-Term U.S. Government Fund, designated as Class A, Class B, Class C and Investor Class shares. The shares of each class of Safeco Intermediate-Term U.S. Government Fund represent an equal proportionate interest in the aggregate net assets attributable to that class of the Fund. Holders of each class of shares have certain exclusive voting rights on matters relating to their respective distribution plans. The different classes of Safeco Intermediate-Term U.S. Government Fund may bear different expenses relating to the cost of holding shareholder meetings necessitated by the exclusive voting rights of any class of shares. In the event of liquidation, shareholders of each class are entitled to share pro rata in the net assets of their Fund available for distribution to these shareholders. Shares of each class entitle their holders to one vote per share, are freely transferable and have no preemptive, subscription or conversion rights.

o MEETINGS. Under Delaware law, Safeco Taxable Bond Trust is not required to hold annual shareholder meetings for any Fund. Unless otherwise required by the Investment Company Act, the Fund has no intention of holding annual meetings of shareholders. Pursuant to the Trust Instrument, shareholders have power to vote only on certain matters, including (a) the election and removal

72

of Trustees; (b) approval of any investment management agreement; (c) termination of the Safeco Taxable Bond Trust; (d) certain amendments to the Trust Instrument; and (e) such additional matters relating to the Trust as may be required by law or as the Trustees may consider desirable.

o LIABILITY OF SHAREHOLDERS. Delaware law affords shareholders of a Delaware statutory trust with the same protections afforded stockholders of a Delaware corporation, which means shareholders are not generally subject to liability for the debts or obligations of the statutory trust unless the entity's trust instrument provides otherwise. The Trust Instrument of the Safeco Taxable Bond Trust contains an express disclaimer of shareholder liability for acts, obligations or affairs of Safeco Intermediate-Term U.S. Government Fund and provides for indemnification out of the Fund's assets for all losses and expenses of any shareholder held personally liable for reason of being or having been a shareholder.

Characteristics of Pioneer America Income Trust (a Massachusetts business trust)

o GOVERNANCE AND MANAGEMENT. Pioneer America Income Trust is a Massachusetts business trust. The governing instrument of Pioneer America Income Trust is its Agreement and Declaration of Trust ("Declaration of Trust"). The business of Pioneer America Income Trust is managed under the direction of its Board of Trustees. The Trustees, in addition to viewing the actions of the Pioneer America Income Trust's investment adviser, decide upon matters of general policy at their regular meetings. The officers of Pioneer America Income Trust supervise its business operations.

o SHARES AND CLASSES. Pioneer America Income Trust is authorized to issue shares of beneficial interest and to increase or decrease the aggregate number of shares of beneficial interest or the number of shares of any class that the Fund has authority to issue. Each share is entitled to one vote on all questions relating to the Fund, and each share is entitled to participate equally in dividends and capital gains distributions and in the residual assets of the respective class in the event of liquidation.

o MEETINGS. Under Massachusetts law, Pioneer America Income Trust, as a registered open-end investment company, is not required to hold annual shareholder meetings. Unless otherwise required by the Investment Company Act, the Pioneer America Income Trust has no intention of holding annual meetings of shareholders. Pursuant to the Declaration of Trust, special meetings of shareholders may be called at any time by the Chairman, President or by the Board of Trustees or by the secretary upon the written request of shareholders entitled to cast at least 25% of the votes entitled to be cast at such meeting, provided that such request shall state the purposes of such meeting and the matters proposed to be acted on.

o LIABILITY OF SHAREHOLDERS. Shareholders of a Massachusetts business trust may, under certain circumstances, be held personally liable for the obligations of the trust. However, the Declaration of Trust contains an express disclaimer of shareholder liability for acts or obligations of the Pioneer America Income Trust or any series of the Pioneer America Income Trust and provides that notice of such disclaimer may be given in each agreement, obligation or instrument entered into or executed by the Pioneer America Income Trust or its Trustees. Moreover, the Declaration of Trust provides for the indemnification out of Pioneer America Income Trust property of any shareholders held personally liable for any obligations of the Pioneer America Income Trust or any series of the Pioneer America Income Trust. The Declaration of Trust also provides that the Pioneer America Income Trust shall, upon request, assume the defense of any claim made against any shareholder for any act or obligation of the Pioneer America Income Trust and satisfy any judgment thereon. Thus, the risk of a shareholder incurring financial loss beyond his or her investment because of shareholder liability would be limited to circumstances in which the Fund itself will be unable to meet its obligations. In light of the nature of the Pioneer America Income Trust's business and the nature and amount of its assets, the possibility of the Pioneer America Income Trust's liabilities exceeding its assets, and therefore a shareholder's risk of personal liability, is remote.

Reasons for the Proposed Reorganization

The Trustees believe that the proposed Reorganization is in the best interests of Safeco Intermediate-Term U.S. Government Fund. The Trustees considered the following matters, among others, in approving the proposal.

First, SAM, the investment adviser to the Safeco Fund until August 2, 2004, was acquired by Symetra. Symetra informed the Trustees that it did not intend to continue to provide investment advisory services to the Safeco Funds. Consequently, a change in your Safeco Fund's investment adviser was necessary.

Second, the performance of Pioneer America Income Trust is generally consistent with the historical investment performance of your Safeco Fund. For the one, five and ten year periods ended June 30, 2004, Class A shares of Pioneer America Income Trust had an average annual return of -0.37%, 5.64%, and 5.97%, respectively, compared to an average annual return of the Class A shares and Investor Class shares of -4.56% and -0.73% (one year), 4.73% and 5.73% (five years) and 5.79% and 6.29% (ten years), respectively, during the same periods. In addition, the Trustees considered the track record of Pioneer in managing equity and fixed income mutual funds.

73

Third, the resources of Pioneer. At June 30, 2004, Pioneer managed over 62 investment companies and accounts with approximately $35 billion in assets. Pioneer is part of the global asset management group of UniCredito Italiano S.p.A., one of the largest banking groups in Italy, providing investment management and financial services to mutual funds, institutional and other clients. As of June 30, 2004, assets under management of UniCredito Italiano S.p.A. were approximately $151 billion worldwide. Shareholders of your Safeco Fund would become part of a significantly larger family of funds that offers a more diverse array of investment options and enhanced shareholder account options. The Pioneer family of mutual funds offers over 62 funds, including domestic and international equity and fixed income funds and a money market fund that will be available to your Safeco Fund's shareholders through exchanges. In addition, Pioneer offers shareholders additional options for their accounts, including the ability to transact and exchange shares over the telephone or online and the ability to access account values and transaction history in all of the shareholder's direct accounts in the Pioneer Funds over the telephone or online.

Fourth, Pioneer America Income Trust's lower operating expenses and Pioneer's commitment until the second anniversary of the Reorganization to limit the expenses (excluding extraordinary expenses) of the Investor Class of Pioneer America Income Trust to 0.74% of average daily net assets. The estimated expenses of the Investor Class of Pioneer America Income Trust are below both the gross expenses and expenses net of contractual expense reimbursement of the end class of shares of your Safeco Fund. Although you will experience higher expenses once the Investor Class shares convert to Class A shares after two years, based upon the Class A expense ratio of Pioneer America Income Trust for the most recent fiscal year, Pioneer America Income Trust's expenses were lower than the gross and net expense ratio of each class of shares of your Safeco Fund. While there are some differences between the policies of the two Funds, the Trustees believe that the two Funds represent substantially equivalent investments.

Fifth, the substantially larger size of Pioneer America Income Trust offers greater opportunity for diversification of the investment portfolio, which should help to reduce risks.

Sixth, shareholders who own shares in their name as of the closing of the Reorganization (i.e., not in the name of a broker or other intermediary) and maintain their account may purchase additional Class A shares of the corresponding Pioneer Fund through such account in the future or may exchange those shares for Class A shares of another Pioneer Fund or purchase Class A share of another Pioneer Fund without paying any sales charge.

Seventh, the Investor Class shares of Pioneer America Income Trust received in the Reorganization will provide Safeco Intermediate-Term U.S. Government Fund shareholders with exposure to substantially the same investment product as they currently have.

Pioneer and Symetra will pay all out of pocket expenses of the Safeco Funds and the Pioneer Funds associated with the Reorganizations, including, but not limited to: (1) the expenses associated with the preparation, printing and mailing of any shareholder communications, including this joint Proxy Statement/Prospectus, and any filings with the SEC and other governmental authorities in connection with the Reorganizations; (2) the fees and expenses of any proxy solicitation firm retained in connection with the Reorganizations;
(3) the legal fees and expenses incurred by the Safeco Funds in connection with the Reorganizations; and (4) the Trustees' fees and out of pocket expenses incurred as a result of the Reorganizations.

The Trustees considered that Pioneer and Symetra will benefit from the Reorganization. See "Will Pioneer and Symetra Benefit from the Reorganizations."

The Board of Trustees of Pioneer America Income Trust also considered that the Reorganization presents an excellent opportunity for the Pioneer America Income Trust to acquire investment assets without the obligation to pay commissions or other transaction costs that a fund normally incurs when purchasing securities. This opportunity provides an economic benefit to Pioneer America Income Trust and its shareholders.

74

CAPITALIZATION

The following table sets forth the capitalization of each Fund, and the pro forma combined Fund as of June 30, 2004.

                                                  Safeco
                                              Intermediate-                             Pro Forma
                                                Term U.S.        Pioneer America     Pioneer America
                                             Government Fund       Income Trust       Income Trust
                                              June 30, 2004       June 30, 2004       June 30, 2004
                                            -----------------   -----------------   ----------------
Total Net Assets (in thousands) .........         $66,742             $204,736           $271,478
 Class A shares .........................         $ 5,109             $129,465           $129,465
 Class B shares .........................         $ 2,338             $ 44,300           $ 44,300
 Class C shares .........................         $    97             $ 30,487           $ 30,487
 Investor Class shares ..................         $59,198                  N/A           $ 66,742
 Class R shares .........................             N/A             $    484           $    484

Net Asset Value Per Share
 Class A shares .........................         $  9.41             $   9.72           $   9.72
 Class B shares .........................         $  9.42             $   9.66           $   9.66
 Class C shares .........................         $  9.42             $   9.69           $   9.69
 Investor Class shares ..................         $  9.41                  N/A           $   9.72
 Class R shares .........................             N/A             $   9.82           $   9.82

Shares Outstanding
 Class A shares .........................         542,858           13,322,479         13,322,479
 Class B shares .........................         248,086            4,585,782          4,585,782
 Class C shares .........................          10,304            3,147,571          3,147,571
 Investor Class shares ..................       6,290,727                  N/A          6,866,461
 Class R shares .........................             N/A               49,339             49,339

It is impossible to predict how many shares of Pioneer America Income Trust will actually be received and distributed by your Safeco Fund on the Reorganization date. The table should not be relied upon to determine the amount of Pioneer America Income Trust's shares that will actually be received and distributed.

BOARD'S EVALUATION AND RECOMMENDATION

For the reasons described above, the Trustees, including the Independent Trustees, approved the Reorganization. In particular, the Trustees determined that the Reorganization is in the best interests of your Safeco Fund. Similarly, the Board of Trustees of Pioneer America Income Trust, including its Independent Trustees, approved the Reorganization. They also determined that the Reorganization is in the best interests of Pioneer America Income Trust.

The Trustees recommend that the shareholders of your Safeco Fund vote FOR the proposal to approve the Agreement and Plan of Reorganization.

75

Safeco Money Market Fund and Pioneer Cash Reserves Fund

PROPOSAL 1(f)

Approval of Agreement and Plan of Reorganization

SUMMARY

The following is a summary of more complete information appearing later in this Proxy Statement/Prospectus or incorporated herein. You should read carefully the entire Proxy Statement/Prospectus, including the form of Agreement and Plan of Reorganization attached as EXHIBIT A-1, because it contains details that are not in the summary.

The Investor Class shares to be issued in the Reorganization will convert to Class A shares after two years. Class A shares will have higher expenses per share than Investor Class shares due to the Rule 12b-1 Plan. In addition, although Pioneer has agreed to limit the expenses attributable to Investor Class shares, Pioneer is not required to limit the expenses attributable to Class A shares.

In the table below, if a row extends across the entire table, the policy disclosed applies to both your Safeco Fund and the Pioneer Fund.

Comparison of Safeco Money Market Fund to Pioneer Cash Reserves Fund

------------------------------------------------------------------------------------------------------------------------------------
                                         Safeco Money Market Fund                          Pioneer Cash Reserves Fund
------------------------------------------------------------------------------------------------------------------------------------
 Business                  A series of Safeco Money Market Trust, a             A series of Pioneer Money Market Trust, a
                           diversified open-end management investment           diversified open-end management investment
                           company organized as a Delaware statutory            company registered under the Investment
                           trust.                                               Company Act and organized as a Delaware
                                                                                statutory trust.
------------------------------------------------------------------------------------------------------------------------------------
 Net assets as of          $286 million                                         $510 million
 June 30, 2004
------------------------------------------------------------------------------------------------------------------------------------
 Investment advisers and   Investment adviser (until August 2, 2004):           Investment adviser:
 portfolio managers        SAM                                                  Pioneer

                           Portfolio Managers:                                  Portfolio Manager:
                           Lesley Fox (since 2000 and until August 2,           Day-to-day management of the Fund's
                           2004) Assistant Vice President, SAM                  portfolio is the responsibility of a team of
                           Joined SAM in 2000                                   fixed income portfolio managers led by
                                                                                Kenneth J. Taubes.
                           Cathleen Beauchamp (since 2003 until
                           July 31, 2004)                                       Mr. Taubes, a senior vice president, joined
                           CFA                                                  Pioneer in 1998 and has been an investment
                                                                                professional since 1982.
                           Currently Pioneer is acting as investment
                           adviser to the Safeco Money Market Fund. The
                           Portfolio Manager of the Pioneer Cash
                           Reserves Fund, as indicated in the next
                           column, currently manages your Safeco Fund.
------------------------------------------------------------------------------------------------------------------------------------
 Investment objective      Safeco Money Market Fund seeks as high a             Safeco Money Market Fund seeks high current
                           level of current income as is consistent with        income, preservation of capital and liquidity
                           the preservation of capital and liquidity through    through investments in high-quality short-term
                           investment in high-quality money market              securities.
                           instruments maturing in 13 months or less.
------------------------------------------------------------------------------------------------------------------------------------

76

------------------------------------------------------------------------------------------------------------------------------------
                                       Safeco Money Market Fund                          Pioneer Cash Reserves Fund
------------------------------------------------------------------------------------------------------------------------------------
 Primary investments     To achieve its investment objective, Safeco         Safeco Money Market Fund seeks to maintain a
                         Money Market Fund will purchase only high-          constant net asset value of $1.00 per share by
                         quality securities with remaining maturities of     investing in high-quality, U.S. dollar
                         397 days or less. The Fund will maintain a          denominated money market securities,
                         dollar-weighted average portfolio maturity of       including those issued by:
                         no more than 90 days.
                                                                             o U.S. and foreign banks
                                                                             o U.S. and foreign corporate issuers
                                                                             o The U.S. government and its agencies and
                                                                               instrumentalities
                                                                             o Foreign governments
                                                                             o Multinational organizations such as the
                                                                               World Bank

                                                                             Safeco Money Market Fund invests exclusively
                                                                             in securities with a maximum remaining
                                                                             maturity of 397 days and maintains a dollar-
                                                                             weighted average portfolio maturity of 90 days
                                                                             or less.

                                                                             Safeco Money Market Fund's investments may
                                                                             have fixed, floating or variable interest rates.
------------------------------------------------------------------------------------------------------------------------------------
 Investment strategies   When evaluating a security to buy, SAM              In selecting Safeco Money Market Fund's
                         historically considered, among other things:        portfolio, Pioneer complies with the rating,
                                                                             maturity and diversification requirements
                         o Yield                                             applicable to money market funds. Within
                         o Maturity                                          those factors, Pioneer's assessment of broad
                         o Issuer credit quality                             economic factors that are expected to affect
                         o Relative value compared with other                economic activity and interest rates influence
                            alternatives                                     its securities selection.

                         Safeco Money Market Fund may sell a
                         security if:

                         o The adviser becomes concerned about the
                           issuer's creditworthiness
                         o A more attractive alternative is available
                         o Cash is needed to meet shareholder
                           redemptions

                         After evaluating a bond, SAM compared the
                         bond to other available bonds, which may have
                         different features, and would buy the bond if it
                         appeared to offer the best relative value.
------------------------------------------------------------------------------------------------------------------------------------
 Other investments       Safeco Money Market Fund will limit its             Safeco Money Market Fund may invest
                         investment in municipal obligations the interest    more than 25% of its total assets in U.S.
                         on which is payable from the revenues of            government securities and obligations of U.S.
                         similar types of projects to less than 25% of       banks. The Fund may invest in any money
                         the Fund's total assets. As a matter of             market instrument that is a permissible
                         operating policy, "similar types of projects"       investment for a money market fun under the
                         may include sports, convention or trade show        rules of the SEC, including commercial paper,
                         facilities; airports or mass transportation;        certificates of deposit, time deposits, bankers'
                         sewage or solid waste disposal facilities; or air   acceptances, mortgage-backed and asset-
                         and water pollution control projects.               backed securities, repurchase agreements,
------------------------------------------------------------------------------------------------------------------------------------

77

------------------------------------------------------------------------------------------------------------------------------------
                                                Safeco Money Market Fund                         Pioneer Cash Reserves Fund
------------------------------------------------------------------------------------------------------------------------------------
 Other investments (continued)   Safeco Money Market Fund will limit its                municipal obligations and other short-term
                                 investment in securities whose issuers are             debt securities.
                                 located in the same state to less than 25% of
                                 the Fund's total assets.                               Safeco Money Market Fund invests in U.S.
                                                                                        government obligations and money market
                                 Safeco Money Market Fund may invest up to              securities rated in one of the two highest
                                 25% of its total assets in the "first tier             rating categories for short-term debt by a
                                 securities" of a single issuer for up to three         nationally recognized statistical rating
                                 business days after purchase. First tier               organization or, if unrated, determined to
                                 securities are securities (1) rated in the highest     be of equivalent credit quality by Pioneer.
                                 short-term category by two nationally
                                 recognized statistical rating organizations
                                 (NRSROs); (2) rated in the highest short-term
                                 rating category by a single NRSRO if only that
                                 NRSRO has assigned the securities a short-
                                 term rating; or (3) unrated, but determined by
                                 SAM to be of comparable quality.
------------------------------------------------------------------------------------------------------------------------------------
 Temporary defensive             Safeco Money Market Fund may hold cash or              Safeco Money Market Fund may invest all or
 strategies                      invest in high-quality, short-term securities issued   part of its assets in securities with
                                 by an agency or instrumentality of the U.S.            remaining maturities of less than one year,
                                 government, high-quality commercial paper,             cash equivalents or may hold cash.
                                 certificates of deposit, shares of no-load, open-
                                 end money market funds, or repurchase
                                 agreements as a temporary defensive measure
                                 when market conditions so warrant.
------------------------------------------------------------------------------------------------------------------------------------
 Diversification                 Each Fund is diversified for the purpose of the Investment Company Act, and each Fund is
                                 subject to diversification requirements under the Code.
------------------------------------------------------------------------------------------------------------------------------------
 Industry concentration          Safeco Money Market Fund will not make                 Safeco Money Market Fund will not
                                 investments that will result in the concentration      concentrate its assets in the securities of
                                 (as defined in the Investment Company Act,             issuers in any one industry except with
                                 any rule or order there under, or SEC staff            respect to investments in obligations of
                                 interpretation thereof) of its investments in the      (a) the U.S. government, its agencies,
                                 securities of issuers primarily engaged in the         authorities or instrumentalities and (b)
                                 same industry, provided that this restriction          domestic banks, purchase any security if,
                                 does not limit the Fund from investing in              as a result (i) more than 5% of the assets
                                 obligations issued or guaranteed by the U.S.           of the Fund would be in the securities of
                                 government, its agencies or instrumentalities,         any one issuer, or (ii) more than 25% of
                                 or certain bank instruments issued by                  its assets would be in a particular
                                 domestic banks.                                        industry.
------------------------------------------------------------------------------------------------------------------------------------
 Restricted and illiquid         If immediately after and as a result of such           Safeco Money Market Fund will not invest
 securities                      action the value of the following securities, in       more than 10% of its net assets in illiquid
                                 the aggregate, would exceed 10% of the Fund's          and other securities that are not readily
                                 net assets, the Fund will not (i) purchase             marketable. Repurchase agreements maturing
                                 securities for which there is no readily available     in more than seven days will be included
                                 market, (ii) purchase time deposits maturing in        for purposes of the foregoing limit.
                                 more than seven days, (iii) purchase over-the-         Securities subject to restrictions on
                                 counter (OTC) options or hold assets set aside         resale under the 1933 Act are considered
                                 to cover OTC options written by the Fund, (iv)         illiquid unless they are eligible for
                                 enter into repurchase agreements maturing in           resale pursuant to Rule 144A or another
                                                                                        exemption from the registration
------------------------------------------------------------------------------------------------------------------------------------

78

------------------------------------------------------------------------------------------------------------------------------------
                                               Safeco Money Market Fund                         Pioneer Cash Reserves Fund
------------------------------------------------------------------------------------------------------------------------------------
 Restricted and illiquid         more than seven days, or (v) invest in interests       requirements of the 1933 Act and are
 securities (continued)          in real estate investment trusts which are not         determined to be liquid by Pioneer.
                                 readily marketable or interests in real estate
                                 limited partnerships which are not listed or
                                 traded on the NASDAQ Stock Market.
------------------------------------------------------------------------------------------------------------------------------------
 Borrowing                       Safeco Money Market Fund may borrow money              Safeco Money Market Fund may not borrow
                                 (i) from banks or (ii) by engaging in reverse          money, except from banks for extraordinary
                                 repurchase agreements.                                 purposes or to meet redemptions in amounts
                                                                                        not exceeding 33 1/3% of its total assets
                                                                                        (including the amount borrowed). The Fund
                                                                                        does not intend to borrow money during the
                                                                                        coming year.
------------------------------------------------------------------------------------------------------------------------------------
 Lending                         Safeco Money Market Fund may lend securities           Safeco Money Market Fund may not make loans
                                 to qualified institutional investors with a value      to any person, except by (a) the purchase
                                 of up to 33% of the Fund's total assets.               of a debt obligation in which the Fund is
                                                                                        permitted to invest and (b) engaging in
                                                                                        repurchase agreements.
------------------------------------------------------------------------------------------------------------------------------------
 Derivative instruments          Safeco Money Market Fund may not purchase              Safeco Money Market Fund may not purchase
                                 securities on margin. However, the Fund may (i)        securities on margin.
                                 obtain short-term credits as necessary to clear its
                                 purchases and sales of securities, and (ii) make
                                 margin deposits in connection with its use of
                                 financial options and futures, forward and spot
                                 currency contracts, swap transactions and other
                                 financial contracts or derivative instruments.
------------------------------------------------------------------------------------------------------------------------------------
 Other investment policies and   As described above, the Funds have substantially
                                 similar principal investment strategies and
 restrictions                    policies. Certain of the non-principal investment
                                 policies and restrictions are different. For a
                                 more complete discussion of each Fund's other
                                 investment policies and fundamental and non-
                                 fundamental investment restrictions, see the SAI.
------------------------------------------------------------------------------------------------------------------------------------
                                                            Buying, Selling and Exchanging Shares
------------------------------------------------------------------------------------------------------------------------------------
 Sales charges                   Purchases of Class A shares of Safeco Money            The Investor Class shares of Pioneer Cash
                                 Market Fund are not subject to a sales load.           Reserves Fund you receive in the
                                                                                        Reorganization will not be subject to any
                                 A contingent deferred sales charge may apply           sales charge. Moreover, if you own shares
                                 if you redeem Class B shares that were                 in your own name as of the closing of the
                                 purchased by exchange from another fund.               Reorganization (i.e., not in the name of a
                                                                                        broker or other intermediary) or own shares
                                 A contingent deferred sales charge of 1% if            in the name of an omnibus account provider
                                 you redeem Class C shares within one year of           as of the closing of the Reorganization
                                 purchase, and the shares were purchased by             that agrees with the Pioneer Fund to
                                 exchange from another fund.                            distinguish beneficial holders in the same
                                                                                        manner and maintain your account, you may
                                 Purchases of Investor Class shares of the Fund         purchase Class A shares of Pioneer Cash
                                 are not subject to a sales load.                       Reserves Fund and Class A shares of any
                                                                                        fund in the Pioneer family of funds through
                                                                                        such account in the future without paying
                                                                                        any sales charge.

                                                                                        Except as described above, Class A shares of
                                                                                        Pioneer Cash Reserves Fund are not subject
                                                                                        to a front-end sales charge.
------------------------------------------------------------------------------------------------------------------------------------

79

------------------------------------------------------------------------------------------------------------------------------------
                                           Safeco Money Market Fund                              Pioneer Cash Reserves Fund
------------------------------------------------------------------------------------------------------------------------------------
 Management and other fees   Safeco Money Market Fund pays an advisory                  Pioneer Cash Reserves Fund pays Pioneer a
                             fee on a monthly basis at an annual rate as                management fee equal to 0.40% of the Fund's
                                                                                        average daily net assets. During its most
                             follows:                                                   recent fiscal year, Pioneer Cash Reserves
                             $0-$250,000,000:                        0.50 of 1%         Fund paid an advisory fee at an average
                             $250,000,001-$750,000,000:              0.45 of 1%         rate of 0.40% of average daily net assets.
                             $750,000,001-$1,250,000,000:            0.40 of 1%
                             Over $1,250,000,000:                    0.35 of 1%         In addition, the Fund reimburses Pioneer
                                                                                        for certain fund accounting and legal
                             SAM serves as administrator and fund                       expenses incurred on behalf of the Fund and
                             accounting agent for Safeco Money Market                   pays a separate shareholder
                             Fund. The Fund pays SAM an administrative                  servicing/transfer agency fee to PIMSS, an
                             services fee of 0.05% of the Fund's average                affiliate of Pioneer.
                             daily net assets up to the first $200,000,000
                             and 0.01% of its net assets thereafter, and an             For the fiscal year ended December 31,
                             accounting fee of 0.04% of the Fund's average              2003, the Fund's total annual operating
                             daily net assets up to the first $200,000,000              expenses for Class A shares were 1.06% of
                             and 0.01% of its net assets thereafter.                    average daily net assets. The Fund does not
                             During its most recent fiscal year, Safeco Money           currently have an expense limitation for
                             Market Fund paid aggregate advisory and                    its Class A shares.
                             administration fees at an average rate of 0.53%
                             of average daily net assets.                               Pioneer has agreed until the second
                                                                                        anniversary of the closing of the
                             SAM had contractually agreed until April 30,               Reorganization to limit the expenses
                             2009, to pay certain Fund operating expenses               (excluding extraordinary expenses) of the
                             (but not all of the operating expenses of the              Investor Class to 0.71% of the average
                             Fund) that exceeded the rate of 0.30% per                  daily net assets attributable to the
                             annum of the Fund's average daily net assets.              Investor Class.
                             This arrangement included all Fund operating
                             expenses except management fees, Rule 12b-1                The Investor Class shares to be issued in
                             fees, brokerage commissions, interest, and                 the Reorganization will convert to Class A
                             extraordinary expenses.                                    shares after two years. Class A shares will
                                                                                        have higher expenses per share than
                             For the fiscal year ended December 31, 2003,               Investor Class shares due to the Rule 12b-1
                             the Fund's annual operating expenses for Class             Plan. In addition, although Pioneer has
                             A shares, after giving effect to the expense               agreed to limit the expenses attributable
                             limitation were 0.78%, and without giving                  to Investor Class shares, Pioneer is not
                             effect to the expense limitation, were 0.98%.              required to limit the expenses attributable
                                                                                        to Class A shares.
                             For the fiscal year ended December 31, 2003,
                             the Fund's annual operating expenses for Class
                             B shares, after giving effect to the expense
                             limitation were 0.78%, and without giving
                             effect to the expense limitation, were 1.17%.

                             For the fiscal year ended December 31, 2003,
                             the Fund's annual operating expenses for Class
                             C shares, after giving effect to the expense
                             limitation were 0.78%, and without giving
                             effect to the expense limitation, were 1.01%.
                             For the fiscal year ended December 31, 2003,
                             the Fund's annual operating expenses for
                             Investor Class shares were 0.67%.
------------------------------------------------------------------------------------------------------------------------------------

80

------------------------------------------------------------------------------------------------------------------------------------
                                         Safeco Money Market Fund                        Pioneer Cash Reserves Fund
------------------------------------------------------------------------------------------------------------------------------------
 Distribution and service   Class A shares of Safeco Money Market Fund        Class A shares of Pioneer Cash Reserves Fund
 (12b-1) fee                are not currently subject to a Rule 12b-1 fee.    are subject to a Rule 12b-1 fee equal to
                                                                              0.15% annually of average daily net assets.
                            --------------------------------------------------------------------------------------------------------
                            Investor Class shares of the Pioneer Fund are not subject to a Rule 12b-1 fee. Pioneer Investor
                            Class shares will convert into Class A shares after two years.
------------------------------------------------------------------------------------------------------------------------------------
 Buying shares              You may buy shares of the Fund directly           You may buy shares from any investment firm
                            through Safeco Securities, the Fund's principal   that has a sales agreement with PFD, Pioneer
                            underwriter, or through brokers, registered       Cash Reserves Fund's distributor. Existing
                            investment advisers, banks and other financial    shareholders of Safeco Money Market Fund
                            institutions that have entered into selling       who own shares in their own name as of the
                            agreements with the Fund's principal              closing of the Reorganization (i.e., not in the
                            underwriter, as described in the Fund's           name of a broker or other intermediary) or
                            prospectus.                                       own shares in the name of an omnibus
                                                                              account provider as of the closing of the
                            Certain account transactions may be done by       Reorganization that agrees with the Pioneer
                            telephone.                                        Fund to distinguish beneficial holders in the
                                                                              same manner and who maintain their
                                                                              accounts may buy shares of any fund in the
                                                                              Pioneer family of funds through such
                                                                              accounts in the future without paying sales
                                                                              charges.

                                                                              If the account is established in the
                                                                              shareholder's own name, shareholders may
                                                                              also purchase additional shares of Pioneer
                                                                              Cash Reserves Fund by telephone or online.

------------------------------------------------------------------------------------------------------------------------------------
 Exchange privilege         There are no sales charges on shares you          You may exchange shares of Pioneer Cash
                            acquire through dividend reinvestment or other    Reserves Fund without incurring any fee on
                            Fund distributions or for Class A shares that     the exchange with the more than 62 other
                            you have exchanged for Class A shares of          Pioneer Funds. Your exchange would be for
                            another fund.                                     Class A shares, which is subject to Rule
                                                                              12b-1 fees. An exchange generally is treated
                            Certain account transactions may be done by       as a sale and a new purchase of shares for
                            telephone.                                        federal income tax purposes.

                                                                              If the account is established in the
                                                                              shareholder's own name, shareholders may
                                                                              also exchange shares of Pioneer Cash
                                                                              Reserves Fund for shares of other Pioneer
                                                                              Funds by telephone or online.
------------------------------------------------------------------------------------------------------------------------------------

81

------------------------------------------------------------------------------------------------------------------------------------
                               Safeco Money Market Fund                          Pioneer Cash Reserves Fund
------------------------------------------------------------------------------------------------------------------------------------
 Selling shares   Each class of shares will be sold at net asset value per share next calculated after the Fund
                  receives your request in good order.
                  ------------------------------------------------------------------------------------------------------------------
                  You may sell your shares by contacting Safeco      Normally, your investment firm will send your
                  Money Market Fund directly in writing or by        request to sell shares to PIMSS. You can
                  contacting a financial intermediary as described   also sell your shares by contacting the Fund
                  in the Fund's prospectus.                          directly if your account is registered in
                                                                     your name.

                                                                     If the account is established in the
                                                                     shareholder's own name, shareholders may
                                                                     also redeem shares of Pioneer Cash Reserves
                                                                     Fund by telephone or online. After the
                                                                     Reorganization, Investor Class shares will not
                                                                     be entitled to check writing privileges, and you
                                                                     should no longer write checks issued by your
                                                                     Safeco Fund.
------------------------------------------------------------------------------------------------------------------------------------

Comparison of Principal Risks of Investing in the Funds

Because each Fund has a similar investment objective, primary investment policies and strategies, the Funds are subject to the same principal risks. Even though the Funds seek to maintain a $1 share price, you could lose money on your investment or the Fund could fail to generate high current income if:

o Interest rates go up, causing the value of the Fund's investments to decline

o The issuer of a security owned by the Fund defaults on its obligation to pay principal and/or interest or has its credit rating downgraded

o The investment adviser's judgment about the credit quality, attractiveness or relative value of a particular security proves to be incorrect

Investing in non-U.S. issuers may involve unique risks compared to investing in securities of U.S. issuers. These risks may include:

o Inadequate financial information

o Smaller, less liquid and more volatile markets

o Political and economic upheavals

The Investor Class shares to be issued in the Reorganization will convert to Class A shares after two years. Class A shares will have higher expenses per share than Investor Class shares due to the Rule 12b-1 Plan. In addition, although Pioneer has agreed to limit the expenses attributable to Investor Class shares, Pioneer is not required to limit the expenses attributable to Class A shares.

82

Past Performance

Set forth below is performance information for each Fund. The bar charts show how each Fund's total return (not including any deduction for sales charges) has varied from year to year for each full calendar year. The tables show average annual total return for each Fund over time for each class of shares (including deductions for sales charges) compared with a broad-based securities market index. The bar charts give an indication of the risks of investing in each Fund, including the fact that you could incur a loss and experience volatility of returns year to year. Past performance before and after taxes does not indicate future results.

Safeco Money Market Fund -- Investor Class Calendar Year Total Returns*

[TABULAR REPRESENTATION OF BAR CHART]

'94     3.53%
'95     5.28
'96     4.75
'97     4.93
'98     5.08
'99     4.65
'00     5.90
'01     3.75
'02     1.32
'03     0.65

* During the period shown in the bar chart, your Safeco Fund's highest quarterly return was 1.52% for the quarter ended December 31, 2000, and the lowest quarterly return was 0.13% for the quarter ended September 30, 2003.

Pioneer Cash Reserves Fund -- Class A shares Calendar Year Total Returns*

[TABULAR REPRESENTATION OF BAR CHART]

'94     3.57%
'95     5.17
'96     4.65
'97     4.78
'98     4.84
'99     4.23
'00     5.53
'01     3.29
'02     1.15
'03     0.26

* During the period shown in the bar chart, Pioneer Cash Reserves Fund's highest quarterly return was 1.45% for the quarter ended December 31, 2000, and the lowest quarterly return was 0.01% for the quarter ended December 31, 2003.

83

Safeco Money Market Fund Average Annual Total Returns as of December 31, 2003

---------------------------------------------------------------------------------------
                                                       1 Year      5 Years     10 Years
---------------------------------------------------------------------------------------
 Safeco Money Market Fund, Class A shares                0.55%       3.20%       3.95%
---------------------------------------------------------------------------------------
 Safeco Money Market Fund, Class B shares                0.55%       3.21%       3.93%
---------------------------------------------------------------------------------------
 Safeco Money Market Fund, Class C shares                0.55%       3.20%       3.93%
---------------------------------------------------------------------------------------
 Safeco Money Market Fund, Investor Class shares         0.65%       3.24%       3.97%
---------------------------------------------------------------------------------------

Pioneer Cash Reserves Fund -- Class A shares Average Annual Total Returns as of December 31, 2003

---------------------------------------------------------------------------------------
                                                       1 Year      5 Years     10 Years
---------------------------------------------------------------------------------------
 Pioneer Cash Reserves Fund, Class A shares              0.26%       2.88%       3.74%
---------------------------------------------------------------------------------------
 90-day U.S. Treasury Bill
  (reflects no deduction for taxes)                      1.03%       3.34%       4.18%
---------------------------------------------------------------------------------------

Pioneer Cash Reserves Fund's Investor Class shares will not be outstanding prior to the closing of the Reorganization and consequently have no performance history. However, the performance record of the Investor Class would be modestly higher than the performance of Class A, B and C shares due to the lower expenses applicable to the Investor Class.

The most recent portfolio manager's discussion of each Fund's performance is attached as Exhibit D.

The Funds' Fees and Expenses

Shareholders of both Funds pay various fees and expenses, either directly or indirectly. The tables below show the fees and expenses that you would pay if you were to buy and hold shares of each Fund. The expenses in the tables appearing below are based on (i) for your Safeco Fund, the expenses of your Safeco Fund for the period ended December 31, 2003 and (ii) for Pioneer Cash Reserves Fund, the expenses of Pioneer Cash Reserves Fund for the period ended December 31, 2003. Future expenses for all share classes may be greater or less.

                                                                                                                      Pro Forma
                                                          Safeco Money  Safeco Money  Safeco Money   Safeco Money   Pioneer Cash
                                                           Market Fund   Market Fund   Market Fund    Market Fund   Reserves Fund
Shareowner transaction fees                                  Class A       Class B       Class C    Investor Class Investor Class(8)
(paid directly from your investment)                      ------------- ------------- ------------- -------------- ---------------
Maximum sales charge (load) when you buy shares as a
 percentage of offering price ............................      None          None          None            None         None(1)
Maximum deferred sales charge (load) as a percentage of
 purchase price or the amount you receive when you sell
 shares, whichever is less ...............................      None          None(6)       None(7)         None         None
Redemption fees for shares held less than 30 days ........      None          None          None            None          N/A
Wire redemption fee ......................................     $ 204         $ 204         $ 204           $ 204        $  10
Annual low balance fee ...................................     $ 125         $ 125         $ 125           $ 125         N/A
Annual fund operating expenses (deducted from fund assets)
 (as a % of average net assets)
Management fee ...........................................      0.48%         0.48%         0.48%           0.48%        0.40%
Distribution and service (12b-1) fee .....................      None          None          None            None         None
Other expenses ...........................................      0.50%         0.69%         0.53%           0.19%        0.41%
Total fund operating expenses ............................      0.98%         1.17%         1.01%           0.67%        0.81%
Expense reimbursement/reduction ..........................      0.20%(2)      0.39%2        0.23%2           N/A         0.10%(3)
Net fund operating expenses ..............................      0.78%         0.78%         0.78%           0.67%        0.71%

84


(1) No sales load will apply to shares received in the Reorganization by shareholders of your Safeco Fund who become shareholders of record of Pioneer Cash Reserves Fund through the Reorganization. In addition, shareholders of your Safeco Fund who own shares in their own name as of the closing of the Reorganization (i.e., not in the name of a broker or other intermediary) or own shares in the name of an omnibus account provider that agrees with the Pioneer Fund to distinguish beneficial holders in the same manner and who maintain their accounts may purchase Class A shares of Pioneer Cash Reserves Fund or of any fund in the Pioneer family of funds through such account in the future without paying this sales charge.

(2) As described above, SAM had contractually agreed to reimburse Safeco Money Market Fund for certain Fund operating expenses (but not all of the operating expenses of the Fund) that exceeded the rate of 0.30% per annum of the Fund's average daily net assets. This arrangement included all Fund operating expenses except management fees, Rule 12b-1 fees, brokerage commissions, interest, and extraordinary expenses.
(3) Pioneer has agreed that through the second anniversary of the closing of the Reorganization, Pioneer will limit the expenses (excluding extraordinary expenses) of the Investor Class shares of Pioneer Cash Reserves Fund to 0.71% of average daily net assets.
(4) There is a higher charge for international wire redemptions, which may vary by country or dollar amount.
(5) A low balance fee is charged once in year in December for accounts with balances under $1,000 in your Safeco Fund.
(6) A contingent deferred sales charge may apply if you redeem Class B shares of your Safeco Fund that were purchased by exchange from another fund.
(7) A 1.00% contingent deferred sales charge may apply if, within the first twelve months of the initial purchase, you redeem Class C shares that were purchased by exchange from another fund
(8) The Investor Class shares to be issued in the Reorganization will convert to Class A shares after two years. Class A shares will have higher expenses per share than Investor Class shares due to the Rule 12b-1 Plan. In addition, although Pioneer has agreed to limit the expenses attributable to Investor Class shares, Pioneer is not required to limit the expenses attributable to Class A shares. Class A shares do not currently have an expense limitation and may be subject to higher total operating expenses.

The hypothetical example below helps you compare the cost of investing in each Fund. It assumes that: (a) you invest $10,000 in each Fund for the time periods shown, (b) you reinvest all dividends and distributions, (c) your investment has a 5% return each year, (d) each Fund's gross operating expenses remain the same, (e) the expense limitations are in effect for five years for Safeco Money Market Fund and two years for Pioneer Cash Reserves Fund and (f) and the Investor Class shares of Pioneer Cash Reserves Fund convert to Class A shares after two years. The examples are for comparison purposes only and are not a representation of either Fund's actual expenses or returns, either past or future.

Example

Safeco Money Market Fund

Class A shares
Year 1 ..............    $   80
Year 3 ..............    $  249
Year 5 ..............    $  433
Year 10 .............    $1,099

Class B shares
Year 1 ..............    $   80
Year 3 ..............    $  249
Year 5 ..............    $  433
Year 10 .............    $1,122

Class C shares
Year 1 ..............    $   80
Year 3 ..............    $  249
Year 5 ..............    $  433
Year 10 .............    $1,119

Investor Class shares
Year 1 ..............    $   68
Year 3 ..............    $  214
Year 5 ..............    $  373
Year 10 .............    $  835

Pro Forma Pioneer Cash Reserves Fund

Investor Class shares
Year 1 ..............    $   73
Year 3 ..............    $  257
Year 5 ..............    $  488
Year 10 .............    $1,151

85

Reasons for the Proposed Reorganization

The Trustees believe that the proposed Reorganization is in the best interests of Safeco Money Market Fund. The Trustees considered the following matters, among others, in approving the proposal.

First, SAM, the investment adviser to the Safeco Fund until August 2, 2004, was acquired by Symetra. Symetra informed the Trustees that it did not intend to continue to provide investment advisory services to the Safeco Funds. Consequently, a change in your Safeco Fund's investment adviser was necessary.

Second, the investment performance of Pioneer Cash Reserves Fund is comparable to the historical investment performance of your Safeco Fund. For the one, five and ten year periods ended June 30, 2004, Class A shares of Pioneer Cash Reserves Fund had an average annual return of 0.12%, 2.50%, and 3.60%, respectively, compared to an average annual return of the Class A shares and Investor Class shares of 0.42% and 0.51% (one year), 2.82% and 2.86% (five years), and 3.82% and 3.85% (ten years), respectively, during the same periods. In addition, the Trustees considered the track record of Pioneer in managing equity and fixed income mutual funds.

Third, the resources of Pioneer. At June 30, 2004, Pioneer managed over 62 investment companies and accounts with approximately $35 billion in assets. Pioneer is part of the global asset management group of UniCredito Italiano S.p.A., one of the largest banking groups in Italy, providing investment management and financial services to mutual funds, institutional and other clients. As of June 30, 2004, assets under management of UniCredito Italiano S.p.A. were approximately $151 billion worldwide. Shareholders of your Safeco Fund would become part of a significantly larger family of funds that offers a more diverse array of investment options and enhanced shareholders account options. The Pioneer family of mutual funds offers over 62 funds, including domestic and international equity and fixed income funds and a money market fund that will be available to your Safeco Fund's shareholders through exchanges. In addition, Pioneer offers shareholders additional options for their accounts, including the ability to transact and exchange shares over the telephone or online and the ability to access account values and transaction history in all of the shareholder's direct accounts in the Pioneer Funds over the telephone or online.

Fourth, Pioneer's commitment until the second anniversary of the Reorganization to limit the expenses (excluding extraordinary expenses) of the Investor Class of Pioneer Cash Reserves Fund to 0.71% of average daily net assets. Although you will experience higher expenses once the Investor Class shares convert to Class A shares after two years, your expenses will remain the same until the second anniversary of the Reorganization.

Fifth, shareholders who own shares in their name as of the closing of the Reorganization (i.e., not in the name of a broker or other intermediary) and maintain their account may purchase additional Class A shares of the corresponding Pioneer Fund through such account in the future or may exchange those shares for Class A shares of another Pioneer Fund or purchase Class A share of another Pioneer Fund without paying any sales charge.

Sixth, the Investor Class shares of Pioneer Cash Reserves Fund received in the Reorganization will provide Safeco Money Market Fund shareholders with exposure to substantially the same investment product as they currently have.

Pioneer and Symetra will pay all out of pocket expenses of the Safeco Funds and the Pioneer Funds associated with the Reorganizations, including, but not limited to: (1) the expenses associated with the preparation, printing and mailing of any shareholder communications, including this joint Proxy Statement/Prospectus, and any filings with the SEC and other governmental authorities in connection with the Reorganizations; (2) the fees and expenses of any proxy solicitation firm retained in connection with the Reorganizations;
(3) the legal fees and expenses incurred by the Safeco Funds in connection with the Reorganizations; and (4) the Trustees' fees and out of pocket expenses incurred as a result of the Reorganizations.

The Trustees considered that Pioneer and Symetra will benefit from the Reorganization. See "Will Pioneer and Symetra Benefit from the Reorganizations."

The Board of Trustees of Pioneer Cash Reserves Fund also considered that the Reorganization presents an excellent opportunity for the Pioneer Cash Reserves Fund to acquire investment assets without the obligation to pay commissions or other transaction costs that a fund normally incurs when purchasing securities. This opportunity provides an economic benefit to Pioneer Cash Reserves Fund and its shareholders.

86

CAPITALIZATION

The following table sets forth the capitalization of each Fund, as of June 30, 2004, and the pro forma combined Fund as of June 30, 2004.

                                                                                   Pro Forma
                                              Safeco Money      Pioneer Cash     Pioneer Cash
                                              Market Fund      Reserves Fund     Reserves Fund
                                             June 30, 2004     June 30, 2004     June 30, 2004
                                            ---------------   ---------------   --------------
Total Net Assets (in thousands) .........       286,380             509,605           795,985
 Class A shares .........................         5,488             301,140           301,140
 Class B shares .........................         1,194              89,406            89,406
 Class C shares .........................           124             118,820           118,820
 Investor Class shares ..................       279,574                 N/A           286,380
 Class R shares .........................           N/A                 239               239

Net Asset Value Per Share
 Class A shares .........................         $1.00               $1.00             $1.00
 Class B shares .........................         $1.00               $1.00             $1.00
 Class C shares .........................         $1.00               $1.00             $1.00
 Investor Class shares ..................         $1.00                 N/A             $1.00
 Class R shares .........................           N/A               $1.00             $1.00

Shares Outstanding
 Class A shares .........................       588,000         301,284,833       301,284,833
 Class B shares .........................     1,194,000          89,371,274        89,371,274
 Class C shares .........................       124,000         118,809,103       118,809,103
 Investor Class shares ..................   279,574,000                 N/A       286,380,000
 Class R shares .........................           N/A             239,463           239,463

It is impossible to predict how many shares of Pioneer Cash Reserves Fund will actually be received and distributed by your Safeco Fund on the Reorganization date. The table should not be relied upon to determine the amount of Pioneer Cash Reserves Fund's shares that will actually be received and distributed.

BOARD'S EVALUATION AND RECOMMENDATION

For the reasons described above, the Trustees, including the Independent Trustees, approved the Reorganization. In particular, the Trustees determined that the Reorganization is in the best interests of your Safeco Fund. Similarly, the Board of Trustees of Pioneer Cash Reserves Fund, including its Independent Trustees, approved the Reorganization. They also determined that the Reorganization is in the best interests of Pioneer Cash Reserves Fund.

The Trustees recommend that the shareholders of your Safeco Fund vote FOR the proposal to approve the Agreement and Plan of Reorganization.

87

Safeco Municipal Bond Fund and Pioneer Municipal Bond Fund

PROPOSAL 1(g)

Approval of Agreement and Plan of Reorganization

SUMMARY

The following is a summary of more complete information appearing later in this Proxy Statement/Prospectus or incorporated herein. You should read carefully the entire Proxy Statement/Prospectus, including the form of Agreement and Plan of Reorganization attached as EXHIBIT A-2, because it contains details that are not in the summary.

The Investor Class shares to be issued in the Reorganization will convert to Class A shares after two years. Class A shares will have higher expenses per share than Investor Class shares due to the Rule 12b-1 Plan. In addition, although Pioneer has agreed to limit the expenses attributable to Investor Class shares, Pioneer is not required to limit the expenses attributable to Class A shares.

In the table below, if a row extends across the entire table, the policy disclosed applies to both your Safeco Fund and the Pioneer Fund.

Comparison of Safeco Municipal Bond Fund to Pioneer Municipal Bond Fund

------------------------------------------------------------------------------------------------------------------------------------
                                     Safeco Municipal Bond Fund                      Pioneer Municipal Bond Fund
------------------------------------------------------------------------------------------------------------------------------------
 Business                  A series of Safeco Tax-Exempt Bond Trust, a    A newly organized diversified open-end
                           diversified open-end management investment     management investment company registered
                           company organized as a Delaware statutory      under the Investment Company Act and
                           trust.                                         organized as a Delaware statutory trust.
------------------------------------------------------------------------------------------------------------------------------------
 Net assets as of          $550 million                                   None. Pioneer Municipal Bond Fund is newly
 June 30, 2004                                                            organized and does not expect to commence
                                                                          investment operations until the Reorganization
                                                                          occurs.
------------------------------------------------------------------------------------------------------------------------------------
 Investment advisers and   Investment adviser (until August 2, 2004):     Investment adviser:
 portfolio managers        SAM                                            Pioneer

                           Portfolio Managers:                            Portfolio Manager:
                           Stephen C. Bauer (since 1981 and until         Day-to-day management of Pioneer Municipal
                           August 2, 2004)                                Bond Fund's portfolio is the responsibility of a
                           President and Director, SAM                    team of fixed income portfolio managers led
                                                                          by Kenneth J. Taubes.
                           Mary Metastasio (since 2003 and until
                           July 31, 2004)                                 Mr. Taubes joined Pioneer as a senior vice
                                                                          president in September 1998 and has been an
                           Currently Pioneer is acting as investment      investment professional since 1982.
                           adviser to Safeco Municipal Bond Fund. The
                           Portfolio Manager of the Pioneer Municipal
                           Bond Fund, as indicated in the next column,
                           currently manages your Safeco Fund.
------------------------------------------------------------------------------------------------------------------------------------
 Investment objective      Each Fund seeks to provide as high a level of current interest income exempt from federal
                           income tax as is consistent with the relative stability of capital.
------------------------------------------------------------------------------------------------------------------------------------

88

------------------------------------------------------------------------------------------------------------------------------------
                                  Safeco Municipal Bond Fund                         Pioneer Municipal Bond Fund
------------------------------------------------------------------------------------------------------------------------------------
 Primary investments     During normal market conditions, Safeco             Normally, Pioneer Municipal Bond Fund
                         Municipal Bond Fund will not invest less than       invests at least 80% of its net assets in
                         80% of its net assets in obligations the interest   investment grade municipal bonds with a
                         on which is exempt from federal income tax.         maturity of more than one year, that
                                                                             provide income that is exempt from federal
                         To achieve its investment objective, Safeco         income tax.
                         Municipal Bond Fund invests primarily in
                         municipal bonds rated investment grade or           Pioneer Municipal Bond Fund's investments
                         better with average maturities of 15 years          include bonds, notes and other debt
                         or longer.                                          instruments issued by or on behalf of
                                                                             states, counties, municipalities, territories
                         Under normal circumstances, Safeco Municipal        and possessions of the United States and
                         Bond Fund invests:                                  the District of Columbia and their
                                                                             authorities, political subdivisions, agencies
                         o at least 80% of its assets in investment-         or instrumentalities.
                           grade municipal bonds with a maturity of
                           more than one year and the interest on            Pioneer Municipal Bond Fund's investments
                           which is exempt from federal income tax;          may have fixed or variable principal
                           and                                               payments and all types of interest rate
                         o up to 20% of its assets in unrated municipal      payment and reset terms, including fixed
                           bonds, as long as the adviser determines          and floating rates, inverse floating rate, zero
                           they are of comparable quality to                 coupon, contingent, deferred and payment
                           investment-grade securities.                      in kind and auction rate features.

                                                                             Pioneer Municipal Bond Fund may invest in
                                                                             municipal securities of any maturity,
                                                                             although under normal circumstances it is
                                                                             anticipated that the Fund will generally
                                                                             invest in longer-term investments. Municipal
                                                                             securities with longer maturities are
                                                                             generally more volatile than other fixed
                                                                             income securities with shorter maturities.
------------------------------------------------------------------------------------------------------------------------------------
                         Each Fund will not invest in securities the interest on which is a tax preference item for
                         purposes of the federal alternative minimum tax.
------------------------------------------------------------------------------------------------------------------------------------
 Investment strategies   When evaluating a bond to buy, SAM historically     Pioneer considers both broad economic factors
                         considered among other things:                      and issuer specific factors in selecting a
                                                                             portfolio designed to achieve Pioneer Municipal
                         o Yield                                             Bond Fund's investment objective. In assessing
                         o Maturity                                          the appropriate maturity and rating weighting of
                         o Structural features such as an issuer's right     the Fund's portfolio, Pioneer considers a variety
                           to buy the bond back at a stated price (a         of factors that are expected to influence
                           "call") or the Fund's right to require the        economic activity and interest rates. These
                           issuer to buy the bond back at a stated price     factors include fundamental economic indicators,
                           (a "put")                                         such as the rates of economic growth and
                         o Credit quality (including the underlying rating   inflation, Federal Reserve monetary policy and
                           of insured bonds)                                 the relative value of the U.S. dollar compared to
                         o The project the issuer is financing               other currencies.
                         o The original offering price
                         o Any state or local tax exemption                  Once Pioneer determines the preferable portfolio
                         o The amount of discount off or premium on          characteristics, Pioneer selects individual
                           the stated principal amount of the bond           securities based upon the terms of the securities
                           represented by the price offered                  (such as yields compared to U.S. Treasuries
------------------------------------------------------------------------------------------------------------------------------------

89

------------------------------------------------------------------------------------------------------------------------------------
                                  Safeco Municipal Bond Fund                         Pioneer Municipal Bond Fund
------------------------------------------------------------------------------------------------------------------------------------
 Investment strategies   SAM may have used the rating services provided      or comparable issues), liquidity and rating and
 (continued)             by Moody's, S&P, or Fitch. Bond ratings indicate    issuer diversification.
                         an issuer's financial strength and ability to meet
                         its debt obligations.                               Pioneer also employs due diligence and
                                                                             fundamental research, an evaluation of the
                         Safeco Municipal Bond Fund may sell bonds           issuer based on its financial statements and
                         when:                                               operations, to assess an issuer's credit
                                                                             quality, taking into account financial condition,
                         o They become fully valued                          future capital needs and potential for change
                         o More attractively valued bonds become             in rating.
                           available
                         o Cash is needed to meet shareholder                In making these portfolio decisions, Pioneer
                           redemptions                                       relies on the knowledge, experience and
                                                                             judgment of its staff who have access to a
                         Because it often takes years for attractive         wide variety of research.
                         relative valuations to be recognized by the
                         municipal securities market, turnover of the
                         Fund's portfolio can be low.
------------------------------------------------------------------------------------------------------------------------------------
 Other investments       Safeco Municipal Bond Fund will limit its           At times, more than 25% of Pioneer Municipal
                         investment in municipal obligations the interest    Bond Fund's assets may be invested in the
                         on which is payable from the revenues of            same market segment, such as financials. To
                         similar types of projects less than 25% of each     the extent the Fund emphasizes investments in
                         Funds' total assets. As a matter of operating       a market segment, the Fund will be subject to a
                         policy, "similar types of projects" may include     greater degree to the risks particular to the
                         sports, convention or trade show facilities;        industries in that segment, and may experience
                         airports or mass transportation; sewage or          greater market fluctuation, than a fund without
                         solid waste disposal facilities; or air and water   the same focus. For example, industries in the
                         pollution control projects.                         financial segment, such as banks, insurance
                                                                             companies, broker-dealers and REITs, may be
                         Safeco Municipal Bond Fund may invest in any        sensitive to changes in interest rates and
                         of the following short-term, tax-exempt             general economic activity and are subject to
                         obligations: municipal notes of issuers rated, at   extensive government regulation.
                         the time of the purchase, within one of the
                         three highest grades assigned by a nationally       Pioneer Municipal Bond Fund may invest up to
                         recognized statistical rating organization          10% of its net assets in debt securities rated
                         ("NRSRO"); unrated municipal notes offered by       below investment grade or, if unrated, of
                         issuers having outstanding municipal bonds          equivalent quality as determined by Pioneer.
                         rated within one of the three highest grades        Debt securities rated below investment grade
                         assigned by an NRSRO; notes issued by or on         are commonly referred to as "junk bonds" and
                         behalf of municipal issuers that are guaranteed     are considered speculative. Below investment
                         by the U.S. government; tax-exempt                  grade debt securities involve greater risk of
                         commercial paper assigned one of the two            loss, are subject to greater price volatility and
                         highest grades by an NRSRO; certificates of         are less liquid, especially during periods of
                         deposit issued by banks with assets of              economic uncertainty or change, than higher
                         $1,000,000,000 or more; and municipal               quality debt securities.
                         obligations that have a maturity of one year or
                         less from the date of purchase.
------------------------------------------------------------------------------------------------------------------------------------

90

------------------------------------------------------------------------------------------------------------------------------------
                                          Safeco Municipal Bond Fund                         Pioneer Municipal Bond Fund
------------------------------------------------------------------------------------------------------------------------------------
 Other investments (continued)                                                          Pioneer Municipal Bond Fund may invest up
                                                                                        to 10% of its net assets in inverse
                                                                                        floating rate obligations (a type of
                                                                                        derivative instrument). Inverse floating
                                                                                        rate obligations represent interests in
                                                                                        tax-exempt bonds. The interest rate on
                                                                                        inverse floating rate obligations will
                                                                                        generally decrease as short-term interest
                                                                                        rates increase, and increase as short-ter
                                                                                        rates decrease. Due to their leveraged
                                                                                        structure, the sensitivity of the market
                                                                                        value of an inverse floating rate
                                                                                        obligation to changes in interest rates i
                                                                                        generally greater than a comparable
                                                                                        long-term bond issued by the same
                                                                                        municipality and with similar credit
                                                                                        quality, redemption and maturity
                                                                                        provisions. Inverse floating rate
                                                                                        obligations may be volatile and involve
                                                                                        leverage risk.
------------------------------------------------------------------------------------------------------------------------------------
                                 Each Fund may invest in obligations of the U.S. government, its agencies or instrumentalities
                                 or in qualified repurchase agreements, the net interest on which is taxable for federal income
                                 tax purposes.

                                 Each Fund will limit its investment in securities whose issuers are located in the same state to
                                 less than 25% of each Fund's total assets.
------------------------------------------------------------------------------------------------------------------------------------
 Temporary defensive             Safeco Municipal Bond Fund may hold cash or            Pioneer Municipal Bond Fund may invest all
 strategies                      as a temporary defensive measure when                  or part of its assets in securities with
                                 market conditions so warrant.                          remaining maturities of less than one year,
                                                                                        cash equivalents or may hold cash.


------------------------------------------------------------------------------------------------------------------------------------
 Diversification                 Each Fund is diversified for the purpose of the Investment Company Act, and each Fund is
                                 subject to diversification requirements under the Code.
------------------------------------------------------------------------------------------------------------------------------------
 Industry concentration          Each Fund will not make investments that will result in the concentration (as that term may be
                                 defined in the Investment Company Act, any rule or order thereunder, or SEC staff interpretation
                                 thereof) of its investments in the securities of issuers primarily engaged in the same industry,
                                 provided that this restriction does not limit each Fund from investing in obligations issued or
                                 guaranteed by the U.S. government, its agencies or instrumentalities.
------------------------------------------------------------------------------------------------------------------------------------
 Restricted and illiquid         If immediately after and as a result of such           Pioneer Municipal Bond Fund will not invest
 securities                      action the value of the following securities, in       more than 10% of its net assets in illiquid
                                 the aggregate, would exceed 10% of Safeco              and other securities that are not readily
                                 Municipal Bond Fund's net assets, the Fund             marketable. Repurchase agreements maturing
                                 will not (i) purchase securities for which there       in more than seven days will be included
                                 is no readily available market, (ii) purchase          for purposes of the foregoing limit.
                                 time deposits maturing in more than seven              Securities subject to restrictions on
                                 days, (iii) purchase over-the-counter (OTC)            resale under the 1933 Act, are considered
                                 options or hold assets set aside to cover OTC          illiquid unless they are eligible for
                                 options written by the Fund, (iv) enter into           resale pursuant to Rule 144A or another
                                 repurchase agreements maturing in more than            exemption from the registration
                                 seven days, or (v) invest in interests in real         requirements of the 1933 Act and are
                                 estate investment trusts which are not readily         determined to be liquid by Pioneer.
                                 marketable or interests in real estate limited
                                 partnerships which are not listed or traded on
                                 the NASDAQ Stock Market.
------------------------------------------------------------------------------------------------------------------------------------

91

------------------------------------------------------------------------------------------------------------------------------------
                      Safeco Municipal Bond Fund                        Pioneer Municipal Bond Fund
------------------------------------------------------------------------------------------------------------------------------------
 Borrowing   Safeco Municipal Bond Fund may borrow             Pioneer Municipal Bond Fund may not borrow
             money (i) from banks or (ii) by engaging in       money, except on a temporary basis and to
             reverse repurchase agreements.                    the extent permitted by applicable law, as
                                                               amended and interpreted or modified from
                                                               time to time by any regulatory authority
                                                               having jurisdiction.

                                                               Under current regulatory requirements,
                                                               Pioneer Municipal Bond Fund may: (a) borrow
                                                               from banks or through reverse repurchase
                                                               agreements in an amount up to 33 1/3% of the
                                                               fund's total assets (including the amount
                                                               borrowed); (b) borrow up to an additional 5%
                                                               of the fund's assets for temporary purposes;
                                                               (c) obtain such short-term credits as are
                                                               necessary for the clearance of portfolio
                                                               transactions; (d) purchase securities on
                                                               margin to the extent permitted by applicable
                                                               law; and (e) engage in transactions in
                                                               mortgage dollar rolls that are accounted for
                                                               as financings.
------------------------------------------------------------------------------------------------------------------------------------
 Lending     Safeco Municipal Bond Fund may lend               Pioneer Municipal Bond Fund may not make
             securities to qualified institutional investors   loans, except that the Fund may (i) lend
             with a value of up to 33% of the Fund's total     portfolio securities in accordance with the
             assets.                                           Fund's investment policies, (ii) enter into
                                                               repurchase agreements, (iii) purchase all or a
                                                               portion of an issue of publicly distributed debt
                                                               securities, bank loan participation interests,
                                                               bank certificates of deposit, bankers'
                                                               acceptances, debentures or other securities,
                                                               whether or not the purchase is made upon the
                                                               original issuance of the securities, (iv)
                                                               participate in a credit facility whereby the Fund
                                                               may directly lend to and borrow money from
                                                               other affiliated funds to the extent permitted
                                                               under the Investment Company Act or an
                                                               exemption therefrom, and (v) make loans in
                                                               any other manner consistent with applicable
                                                               law, as amended and interpreted or modified
                                                               from time to time by any regulatory authority
                                                               having jurisdiction.
------------------------------------------------------------------------------------------------------------------------------------

92

------------------------------------------------------------------------------------------------------------------------------------
                                            Safeco Municipal Bond Fund                        Pioneer Municipal Bond Fund
------------------------------------------------------------------------------------------------------------------------------------
 Derivative instruments          Safeco Municipal Bond Fund may not purchase            Pioneer Municipal Bond Fund may use futures
                                 securities on margin. However, the Fund may (i)        and options on securities, indices and
                                 obtain short-term credits as necessary to clear its    currencies, forward currency exchange
                                 purchases and sales of securities, and (ii) make       contracts and other derivatives. The Fund
                                 margin deposits in connection with its use of          does not use derivatives as a primary
                                 financial options and futures, forward and spot        investment technique and generally limits
                                 currency contracts, swap transactions and other        their use to hedging. However, the Fund may
                                 financial contracts or derivative instruments.         use derivatives for a variety of
                                                                                        non-principal purposes, including:

                                                                                        o As a hedge against adverse changes in
                                                                                          stock market prices, interest rates or
                                                                                          currency exchange rates
                                                                                        o As a substitute for purchasing or selling
                                                                                          securities
                                                                                        o To increase the Fund's return as a non-
                                                                                          hedging strategy that may be considered
                                                                                          speculative
------------------------------------------------------------------------------------------------------------------------------------
 Other investment policies and   As described above, the Funds have substantially similar principal investment strategies and
 restrictions                    policies. Certain of the non-principal investment policies and restrictions are different. For a
                                 more complete discussion of each Fund's other investment policies and fundamental and non-
                                 fundamental investment restrictions, see the SAI.
------------------------------------------------------------------------------------------------------------------------------------
                                            Buying, Selling and Exchanging Shares
------------------------------------------------------------------------------------------------------------------------------------
 Sales charges                   Purchases under $1,000,000 of Class A shares           The Investor Class shares of Pioneer
                                 of Safeco Municipal Bond Fund are subject to           Municipal Bond Fund you receive in the
                                 a 4.50% front-end sales charge.                        Reorganization will not be subject to any
                                                                                        sales charge. Moreover, if you own shares
                                 A contingent deferred sales charge of up to            in your own name as of the closing of the
                                 5.00% if you redeem Class B shares within six          Reorganization (i.e., not in the name of a
                                 years of purchase.                                     broker or other intermediary) or own shares
                                                                                        in the name of an omnibus account provider
                                 A contingent deferred sales charge of up to            as of the closing of the Reorganization
                                 1.00% if you redeem Class C shares within              that agrees with the Pioneer Fund to
                                 one year of purchase.                                  distinguish beneficial holders in the same
                                                                                        manner and maintain your account, you may
                                 Purchases of Investor Class shares of the Fund         purchase Class A shares of Pioneer
                                 are not subject to a sales load.                       Municipal Bond Fund and Class A shares of
                                                                                        any fund in the Pioneer family of funds
                                 The Fund assesses a mandatory redemption               through such account in the future without
                                 fee of 2%, as a percentage of the amount               paying any sales charge.
                                 redeemed or exchanged, on Class A and
                                 Investor Class shares held less than 30 days.          Except as described above, Class A shares
                                                                                        of Pioneer Municipal Bond Fund are subject
                                                                                        to a front-end sales charge of up to 4.50%.
------------------------------------------------------------------------------------------------------------------------------------

93

------------------------------------------------------------------------------------------------------------------------------------
                                    Safeco Municipal Bond Fund                                  Pioneer Municipal Bond Fund
------------------------------------------------------------------------------------------------------------------------------------
 Management and other fees   Safeco Municipal Bond Fund pays an advisory                Pioneer Municipal Bond Fund pays Pioneer a
                             fee on a monthly basis at an annual rate as                management monthly fee at an annual rate
                             follows:                                                   equal to the Fund's average daily net
                                                                                        assets as follows:
                             $0-$250,000,000:                        0.50 of 1%
                             $250,000,001-$750,000,000:              0.45 of 1%         $0-$250,000,000:                    0.50%
                             Over $750,000,000:                      0.40 of 1%         $250,000,001-$750,000,000:          0.45%
                                                                                        Over $750,000,000:                  0.40%
                             SAM serves as administrator and fund
                             accounting agent for the Fund. The Fund pays               In addition, the Fund reimburses Pioneer
                             SAM an administrative services fee of 0.05%                for certain fund accounting and legal
                             of the Fund's average daily net assets up to the           expenses incurred on behalf of the Fund and
                             first $200,000,000 and 0.01% of its net assets             pays a separate shareholder
                             thereafter, and an accounting fee of 0.04% of              servicing/transfer agency fee to PIMSS, an
                             the Fund's average daily net assets up to the              affiliate of Pioneer.
                             first $200,000,000 and 0.01% of its net assets
                             thereafter.                                                Pioneer has agreed until the second
                                                                                        anniversary of the closing of the
                             During its most recent fiscal year, Safeco                 Reorganization to limit the expenses
                             Municipal Bond Fund paid aggregate advisory                (excluding extraordinary expenses) of the
                             and administration fees at an average rate of              Investor Class to 0.62% of the average
                             0.51% of average daily net assets.                         daily net assets attributable to the
                                                                                        Investor Class.
                             SAM had contractually agreed until April 30,
                             2009, to pay certain fund operating expenses               The Investor Class shares to be issued in
                             (but not all of the operating expenses of the              the Reorganization will convert to Class A
                             Fund) that exceeded the rate of 0.40% per                  shares after two years. Class A shares will
                             annum of the Fund's average daily net assets.              have higher expenses per share than
                             This arrangement included all fund operating               Investor Class shares due to the Rule 12b-1
                             expenses except management fees, Rule 12b-1                Plan.
                             fees, brokerage commissions, interest, and
                             extraordinary expenses.

                             For the fiscal year ended December 31, 2003,
                             the Fund's annual operating expenses for Class
                             A shares were 0.87%.

                             For the fiscal year ended December 31, 2003,
                             the Fund's annual operating expenses for Class
                             B shares were 1.66%.

                             For the fiscal year ended December 31, 2003,
                             the Fund's annual operating expenses for Class
                             C shares, after giving effect to the expense
                             limitation were 1.87%, and without given effect
                             to the expense limitation, were 43.13%.

                             For the fiscal year ended December 31, 2003,
                             the Fund's annual operating expenses for
                             Investor Class shares were 0.61%.
------------------------------------------------------------------------------------------------------------------------------------
 Distribution and service    Investor Class shares of each Fund are not subject to a Rule 12b-1 fee. Pioneer