File No. 002-57653
                                            Filed Pursuant to Rule 497(e) under
                                                     the Securities Act of 1933

                                                               January 26, 2010

                          Pioneer Tax Free Income Fund
  Supplement to the May 1, 2009 Class A, Class B and Class C Shares Prospectus
                         and Class Y Shares Prospectus

               Reorganization of Pioneer Tax Free Income Fund into
                        Pioneer AMT-Free Municipal Fund

The reorganization of Pioneer Tax Free Income Fund into Pioneer AMT-Free
Municipal Fund (the "Reorganization") has been approved by the Fund's Board of
Trustees. The Reorganization is expected to occur on or about March 5, 2010, but
may occur on such later date as the parties may agree in writing (the "Closing
Date"). The Reorganization does not require shareholder approval.

The Board of Trustees, including all of the Trustees who are not "interested"
persons (as defined in the Investment Company Act of 1940, as amended) of the
Pioneer Tax Free Income Fund, has determined that the Reorganization is in the
best interest of the Fund and will not dilute the interests of shareholders of
the Fund.

As of the close of business on the Closing Date, Pioneer Tax Free Income Fund
will transfer all of its assets to Pioneer AMT-Free Municipal Fund, and Pioneer
AMT-Free Municipal Fund will assume all of Pioneer Tax Free Income Fund's
liabilities. Shares of Pioneer AMT-Free Municipal Fund will be distributed to
you in proportion to the relative net asset value of your holdings of shares of
Pioneer Tax Free Income Fund on the Closing Date. Therefore, on the Closing
Date, you will hold shares of Pioneer AMT-Free Municipal Fund with the same
aggregate net asset value as your holdings of shares of Pioneer Tax Free Income
Fund immediately prior to the Reorganization.

Also, as of the close of business on the Closing Date, it is expected that
another Pioneer Fund, Pioneer Intermediate Tax Free Income Fund, will transfer
all of its assets to Pioneer AMT-Free Municipal Fund, and Pioneer AMT-Free
Municipal Fund will assume all of Pioneer Intermediate Tax Free Income Fund's
liabilities.

No sales load, contingent deferred sales charge, commission, redemption fee or
other transactional fee will be charged as a result of the Reorganization. After
the Reorganization, any contingent deferred sales charge that applied to your
Class A (if applicable), Class B or Class C shares at the time of the
Reorganization will continue to apply for the remainder of the applicable
holding period at the time of the Reorganization. In calculating any applicable
contingent deferred sales charge, the period during which you held Class B or
Class C shares (and the holding periods applicable to certain purchases of Class
A shares) of Pioneer Tax Free Income Fund will be included in the holding period
of the shares of Pioneer AMT-Free Municipal Fund you receive as a result of the
Reorganization.

As a condition to the closing of the Reorganization, the Funds must receive an
opinion of counsel to the effect that the Reorganization will constitute a
"reorganization" within the meaning of Section 368(a) of the Internal Revenue
Code of 1976, as amended, which generally means that neither you nor Pioneer Tax
Free Income Fund will recognize gain or loss as a direct result of the
Reorganization, and that the aggregate tax basis of Pioneer AMT-Free Municipal
Fund shares that you receive in the Reorganization will be the same as the
aggregate tax basis of the shares that you surrender in the Reorganization. Each
Fund will bear approximately 25% of the expenses incurred in connection with the
Reorganization. Pioneer will bear the remaining 50% of the expenses incurred in
connection with the Reorganization.

Shareholders of Pioneer Tax Free Income Fund who determine that they do not wish
to become shareholders of Pioneer AMT-Free Municipal Fund may (a) redeem their
shares of Pioneer Tax Free Income Fund prior to the Closing Date or (b) exchange
their shares of Pioneer Tax Free Income Fund prior to the Closing Date for
shares of another Pioneer Fund by contacting Pioneer or their investment
professional or financial intermediary. Please note that a redemption or an
exchange of shares of Pioneer Tax Free Income Fund will be a taxable event and a
shareholder may recognize a gain or loss in connection with that transaction.



<PAGE>


                             Comparison of the Funds

The following comparison of the Funds is a summary only. For complete
information, including each Fund's performance history, you should refer to each
Fund's Prospectus and Statement of Additional Information, which are available
free upon request at www.pioneerinvestments.com or by calling 1-800-225-6292.
Updated performance information for each Fund also is available at
www.pioneerinvestments.com.

Investment Adviser and Other Service Providers
Pioneer Investment Management, Inc. ("Pioneer") serves as the investment adviser
of each Fund.  Pioneer also serves as the  administrator  of each Fund.  Pioneer
Funds Distributor, Inc., an affiliate of Pioneer, serves as
the principal underwriter of each Fund.

Portfolio Managers
Day-to-day  management of each Fund's portfolio is the  responsibility  of David
Eurkus. Mr. Eurkus is supported by Timothy Pynchon.

Investment Management Fees
Each Fund has a management fee equal to 0.50% of the Fund's average daily net
assets up to $250 million, 0.45% of the next $500 million and 0.40% on assets
over $750 million.

Fund Assets
As of December 31, 2009, Pioneer Tax Free Income Fund had assets of
approximately $411.4 million and Pioneer AMT-Free Municipal Fund had assets of
approximately $533.8 million. It is anticipated that the combined fund will have
assets of approximately $961.8 million.

Total Operating Expenses
The following tables compare the annual fund operating expenses of each Fund.
The expenses shown below are based on the actual expenses of Pioneer Tax Free
Income Fund and Pioneer AMT-Free Municipal Fund for the twelve-month period
ended December 31, 2009 (unaudited), and the estimated expenses of Pioneer
AMT-Free Municipal Fund on a pro forma basis assuming the Reorganization
occurred on December 31, 2009. Future expenses for all share classes may be
greater or less.
<TABLE>
<S>                                           <C>          <C>          <C>        <C>          <C>           <C>

                                           Pioneer      Pioneer      Combined    Pioneer      Pioneer      Combined
                                          Tax Free     AMT-Free      Pioneer     Tax Free    AMT-Free      Pioneer
                                         Income Fund   Municipal     AMT-Free    Income      Municipal     AMT-Free
                                                         Fund       Municipal      Fund        Fund       Municipal
                                                                    Fund (pro                             Fund (pro
                                                                      forma)                                    forma)

Annual Fund Operating Expenses             Class A      Class A      Class A      Class B     Class B      Class B
(expenses that you pay each year as a
    percentage of the value of your
    investment)
Management Fees                          0.48%        0.48%        0.45%         0.48%      0.48%        0.45%
Distribution and Service (12b-1) Fees    0.25%        0.25%        0.25%         1.00%      1.00%        1.00%
Other Expenses                           0.24%        0.15%        0.18%         0.30%      0.23%        0.26%
Total Annual Fund Operating Expenses     0.97%        0.88%        0.88%         1.78%      1.71%        1.71%
---------------------------------------- ------------ ------------ ------------- ---------- ------------ -------------
---------------------------------------- ------------ ------------ ------------- ---------- ------------ -------------
Less: Fee Waiver and Expense             -0.08%(1)    -0.06%(2)    -0.06%(2)     0.00%      0.00%        0.00%
    Reimbursement                                                  (3)
Net Expenses                             0.89%(1)     0.82%(2)     0.82% (3)     1.78%      1.71%(2)     1.71% (3)




<PAGE>




                                           Pioneer      Pioneer      Combined    Pioneer      Pioneer      Combined
                                          Tax Free     AMT-Free      Pioneer     Tax Free    AMT-Free       Pioneer
                                         Income Fund   Municipal     AMT-Free    Income      Municipal     AMT-Free
                                                         Fund       Municipal      Fund        Fund        Municipal
                                                                    Fund (pro                              Fund (pro
                                                                      forma)                                   forma)

Annual Fund Operating Expenses             Class C      Class C      Class C      Class Y     Class Y       Class Y
(expenses that you pay each year as a
    percentage of the value of your
    investment)
Management Fees                          0.48%        0.48%        0.45%         0.48%      0.48%        0.45%
Distribution and Service (12b-1) Fees    1.00%        1.00%        1.00%         0.00%      0.00%        0.00%
Other Expenses                           0.24%        0.16%        0.19%         0.11%      0.10%        0.10%
Total Annual Fund Operating Expenses)    1.72%        1.64%        1.64%         0.59%      0.58%        0.55%
---------------------------------------- ------------ ------------ ------------- ---------- ------------ --------------
---------------------------------------- ------------ ------------ ------------- ---------- ------------ --------------
Less: Fee Waiver and Expense             0.00%        0.00%        0.00%         0.00%      0.00%        0.00%
    Reimbursement
Net Expenses                             1.72%        1.64% (2)    1.64%  (3)    0.59%      0.58%        0.55% (3)

</TABLE>

(1)  Pioneer has contractually agreed to limit ordinary operating expenses to
     the extent required to reduce the expenses of Pioneer Tax Free Income Fund
     to 0.89% of the average daily net assets attributable to Class A shares.
     This expense limitation is in effect through November 1, 2011. There can be
     no assurance that Pioneer will extend the expense limitation beyond such
     time. While in effect, the arrangement may be terminated for a class only
     by agreement of Pioneer and the Board of Trustees.


(2)  Pioneer has contractually agreed to limit ordinary operating expenses to
     the extent required to reduce the expenses of Pioneer AMT-Free Municipal
     Fund to 0.82%, 1.72% and 1.72% of the average daily net assets attributable
     to Class A, Class B and Class C shares, respectively. These expense
     limitations are in effect through May 1, 2012 for Class A shares and
     through May 1, 2011 for Class B and Class C shares. There can be no
     assurance that Pioneer will extend the expense limitations beyond such
     time. While in effect, the arrangement may be terminated for a class only
     by agreement of Pioneer and the Board of Trustees.


(3)  Pioneer has contractually agreed to limit ordinary operating expenses to
     the extent required to reduce the expenses of Pioneer AMT-Free Municipal
     Fund once the Reorganization is completed to 0.82%, 1.72%, 1.72% and 0.55%
     of the average daily net assets attributable to Class A, Class B, Class C
     and Class Y shares, respectively. These expense limitations are in effect
     through June 1, 2012 for Class A shares and through June 1, 2011 for Class
     B shares, Class C shares and Class Y shares. There can be no assurance that
     Pioneer will extend the expense limitations beyond such time. While in
     effect, the arrangement may be terminated for a class only by agreement of
     Pioneer and the Board of Trustees.






<PAGE>


Investment Objectives and Principal Strategies
The Funds have similar investment objectives and principal and non-principal
investment strategies, and fundamental investment policies that are not
materially different. Each Fund is diversified. The table below provides a
summary comparison of the Funds' investment objectives and principal investment
strategies. If a row extends across the entire table, the policy disclosed
applies to both Funds. Because each Fund has similar investment objectives and
investment strategies, they are subject to similar risks. Please refer to each
Fund's Prospectus and Statements of Additional Information, which contain more
complete information about the Fund's investment objectives, fundamental
investment policies and principal and non-principal investment strategies, and
about the risks of investing in the Fund.
<TABLE>
<S>                                     <C>                                                <C>

------------------ ---------------------------------------------- --------------------------------------------------

                           Pioneer Tax Free Income Fund                    Pioneer AMT-Free Municipal Fund

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Investment         As high a level of current income exempt        As high a level of current interest income
Objective          from federal income taxes as possible           exempt from federal income tax as is consistent
                   consistent with the preservation of capital.    with the relative stability of capital.

------------------ ---------------------------------------------- --------------------------------------------------
------------------ ---------------------------------------------- --------------------------------------------------
Principal          Normally, the Fund invests at least 80% of     Normally, the Fund invests at least 80% of its
Investment         its total assets in investment grade           net assets (plus the amount of borrowings, if
Strategies         securities that provide income                 any, for investment purposes) in investment
                   that is exempt from regular federal income     grade municipal bonds with a maturity of more
                   tax and is not subject to the alternative      than one year, the interest on which is exempt
                   minimum tax (AMT).                             from regular federal income tax. The Fund
                                                                  normally will not invest in securities the
                   The Fund may invest in securities of any       interest on which is a tax preference item for
                   maturity.                                      purposes of the federal alternative minimum tax
                                                                  (AMT).
                   The Fund may invest 25% or more of its
                   assets in issuers in any one or more states    The Fund may invest in municipal securities of
                   or securities the payments on which are        any maturity, although under normal circumstances it is
                   derived from gas, electric, telephone,         anticipated that the Fund will generally invest in longer-term
                   sewer, water, healthcare, education and        investments. Municipal securities with longer
                   transportation segments of the municipal       maturities are generally more volatile than
                   bond market.                                   other fixed income securities with shorter maturities.

                   The Fund also may invest up to 20% of its      The Fund  normally will limit its investment in municipal
                   assets in industrial development bonds.        securities whose issuers are located in the same state
                                                                  to less than 25% of the Fund's total assets. The portion of the
                                                                  Fund's investments in municipal securities whose issuers
                                                                  are located in the state of California currently exceeds 25% of
                                                                  the Fund's total assets. Consequently, the Fund will be more
                                                                  susceptible to economic, political and other developments
                                                                  that may adversely affect California issuers than are funds
                                                                  whose portfolios are more geographically diverse.

------------------ ---------------------------------------------- --------------------------------------------------
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                   The Fund may invest up to 20% of its net assets in taxable investments, including securities of
                   other investment companies, commercial paper, U.S. government securities, U.S. or foreign bank
                   instruments and repurchase agreements.

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                   The Fund may invest up to 10% of its net assets in debt
                   securities rated below investment grade or, if unrated, of
                   equivalent quality as determined by Pioneer. Debt securities
                   rated below investment grade are commonly referred to as
                   "junk bonds" and are considered speculative.

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                   Each Fund may, but is not required to, use futures and
                   options on securities, indices and other derivatives. Each
                   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. Inverse floating rate obligations may be
                   volatile and involve leverage risk.

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</TABLE>



                                                                   23680-00-0110
                                         (C)2010 Pioneer Funds Distributor, Inc.
                                            Underwriter of Pioneer mutual funds,
                                                                     Member SIPC