<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000202679
<NAME> PIONEER TAX-FREE INCOME FUND
<SERIES>
   <NUMBER> 001
   <NAME> PIONEER TAX-FREE INCOME FUND CLASS A
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-END>                               JUN-30-1998
<INVESTMENTS-AT-COST>                        382059429
<INVESTMENTS-AT-VALUE>                       406555194
<RECEIVABLES>                                  7598760
<ASSETS-OTHER>                                     849
<OTHER-ITEMS-ASSETS>                               165
<TOTAL-ASSETS>                               414154968
<PAYABLE-FOR-SECURITIES>                       5049516
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      1226169
<TOTAL-LIABILITIES>                            6275685
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                     373745877
<SHARES-COMMON-STOCK>                         32640563
<SHARES-COMMON-PRIOR>                         34002418
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                           67749
<ACCUMULATED-NET-GAINS>                        9705390
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                      24495765
<NET-ASSETS>                                 407879283
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                             11225464
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                 1907479
<NET-INVESTMENT-INCOME>                        9317985
<REALIZED-GAINS-CURRENT>                       9707607
<APPREC-INCREASE-CURRENT>                    (8885250)
<NET-CHANGE-FROM-OPS>                         10140342
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                      9219397
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        1187157
<NUMBER-OF-SHARES-REDEEMED>                    3099455
<SHARES-REINVESTED>                             550443
<NET-CHANGE-IN-ASSETS>                      (13207929)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                        2217
<GROSS-ADVISORY-FEES>                           990278
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                1909108
<AVERAGE-NET-ASSETS>                         406580218
<PER-SHARE-NAV-BEGIN>                            12.17
<PER-SHARE-NII>                                    .27
<PER-SHARE-GAIN-APPREC>                            .03
<PER-SHARE-DIVIDEND>                               .28
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              12.19
<EXPENSE-RATIO>                                    .92
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>