PIONEER TAX FREE STATE SERIES TRUST
N-30D, 1996-05-29
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<PAGE>

PIONEER 
MASSACHUSETTS 
DOUBLE TAX-FREE 
FUND 



ANNUAL REPORT 
MARCH 31, 1996 



<PAGE>

DEAR SHAREOWNER, 

This is our final letter to shareowners in Pioneer Massachusetts Double 
Tax-Free Fund. We are pleased to report that your Fund's record of 
excellent performance continued through March 31, 1996, the close of its 
final fiscal year. 

As you know, the Fund's Trustees made the decision to close the Fund in 
March because of its small size. Your Trustees thought it unlikely the 
Fund would become large enough to operate economically, and so determined 
that it would not be in shareowners' best interests for the Fund to 
continue its operations. As a result, the Fund's fiscal year-end was 
changed from September 30 to March 31, and the Fund ceased operations on 
April 10, 1996. Enclosed with this report is another report, dated April 
10, 1996, which contains the Fund's final financial statements. 

                          HOW YOUR FUND PERFORMED 

We report the following performance for the abbreviated fiscal year from 
September 30, 1995, through March 31, 1996: 

* Shareowners received a total of $0.262 in tax-free income dividends. All 
  income distributed through March 31 was exempt from federal and state 
  personal income taxes. 

* Net asset value was $11.00 on March 31, versus $10.98 on September 30. 

* The Fund generated a total return of 2.54% at net asset value, and 
  -1.07% at public offering price. Total return reflects the change in 
  share price and assumes the reinvestment of all distributions at net 
  asset value. 

Please turn to page 2 for information on the Fund's longer-term 
performance. 

                       HOW WE MANAGED THE PORTFOLIO 

For the early part of the period, interest rates continued the decline 
begun earlier in 1995. Prices rose for bonds of all types, although 
concerns about tax reform continued to suppress prices of municipal bonds. 
As we moved into 1996, however, mixed economic reports brought interest 
rates up and bond prices down. 

Throughout the period, your Fund's management maintained a diversified 
portfolio, emphasizing high-quality, directly funded municipal bonds. We 
continued to avoid lease bonds, or other issues where the source of 
repayment was less certain. As a result, the Fund's share price held up 
quite well during the period, even through the process of liquidating the 
portfolio. 

The following pages contain the Fund's Schedule of Investments and audited 
financial statements as of March 31, 1996. For information on the period 
between March 31 and April 10, 1996, please consult the enclosed final 
report. 

We thank you for your interest in Pioneer and hope your experience with us 
was pleasant and successful. If you have any questions about your 
investment in Pioneer Massachusetts Double Tax-Free Fund, please contact 
your investment representative, or call Pioneer at 1-800-225-6292. 

/s/ John F. Cogan, Jr. 

Sincerely, 
John F. Cogan, Jr. 
Chairman and President, 
Pioneer Massachusetts Double Tax-Free Fund 
<PAGE>

                      GROWTH OF A $10,000 INVESTMENT* 

The following chart shows the growth of a $10,000 investment made in 
Pioneer Massachusetts Double Tax-Free Fund at public offering price, 
compared to the growth of the Lehman Brothers Municipal Bond Index.** 

<TABLE>
<CAPTION>
                   PIONEER MASSACHUSETTS DOUBLE TAX-FREE FUND 
                                                 AVERAGE ANNUAL TOTAL RETURNS 
                                                    (AS OF MARCH 31, 1996) 
PERIOD                                   NET ASSET VALUE       PUBLIC OFFERING PRICE* 
<S>                                      <C>                   <C>
Life-of-Fund (2/19/93)                   4.91%                   3.73% 
Three Years                              5.14                    3.90 
One Year                                 7.34                    3.58 
</TABLE>

                PIONEER MASSACHUSETTS DOUBLE TAX-FREE FUND 
                      GROWTH OF A $10,000 INVESTMENT 

<TABLE>
<CAPTION>
                                        Pioneer                       Lehman 
                                     Massachusetts                   Brothers 
                                    Double Tax-Free               Municipal Bond 
                                          Fund                        Index 
<S>                                     <C>                          <C>  
2/28/93                                 $ 9,650                      $10,000 
3/31/93                                   9,628                        9,894 
6/30/93                                   9,993                       10,218 
9/30/93                                  10,369                       10,564 
12/31/93                                 10,482                       10,712 
3/31/94                                   9,698                       10,124 
6/30/94                                   9,750                       10,238 
9/30/94                                   9,712                       10,306 
12/31/94                                  9,572                       10,158 
3/31/95                                  10,425                       10,876 
6/30/95                                  10,633                       11,138 
9/30/95                                  10,913                       11,458 
12/31/95                                 11,435                       11,931 
3/31/96                                  11,189                       11,788 
</TABLE>

 * Reflects deduction of the maximum 3.50% sales charge at the beginning 
   of the period and assumes reinvestment of distributions at net asset 
   value. 
** Index comparison begins 2/28/93. 

The Lehman Brothers Municipal Bond Index is an unmanaged measure of 
approximately 8,000 municipal bonds. Bonds in the Index have a minimum 
credit rating of BBB, were part of at least a $50 million issuance made 
within the past five years and have a maturity of at least two years. 
Index returns assume reinvestment of dividends and, unlike Fund returns, 
do not reflect any sales charges, fees or expenses. You cannot invest 
directly in the Index. 

Past performance does not guarantee future results. Return and principal 
fluctuate so that an investor's shares, when redeemed, may be worth more 
or less than their original cost. 

                                     2 
<PAGE>
SCHEDULE OF INVESTMENTS -- PIONEER MASSACHUSETTS DOUBLE TAX-FREE FUND -- 
MARCH 31, 1996 

<TABLE>
<CAPTION>
              STANDARD 
             & POOR'S/ 
              MOODY'S 
PRINCIPAL     RATINGS 
 AMOUNT     (UNAUDITED)                                                    VALUE 
<S>         <C>           <C>                                              <C>
                          TAX-EXEMPT SECURITIES -- 100%+ 
                          MASSACHUSETTS -- 81.6% 
 $ 100,000  AAA/Aaa       Attleboro General Obligation, AMBAC Insured,
                            5.3%, 2003                                    $   102,964 
   50,000   AAA/Aaa       Boston General Obligation, AMBAC Insured,
                            5.55%, 2008                                        50,553 
   50,000   AAA/Aaa       Dighton & Rehoboth Regional School District
                            General Obligation, AMBAC Insured, 5.4%, 2009      49,941 
   50,000   NR/Aa         Hingham General Obligation, 5.1%, 2006               50,661 
   50,000   A+/A1         Massachusetts Bay Transportation Authority
                            Revenue, 5.2%, 2003                                51,017 
  100,000   A+/A1         Massachusetts Bay Transportation Authority
                            Revenue, 6.1%, 2013                               104,968 
   75,000   A+/A1         Massachusetts General Obligation, 4.4%, 1998         75,326 
   50,000   A+/A1         Massachusetts Health and Educational Facilities 
                            Authority Revenue, Boston College, 5.125%,
                            2008                                               49,166 
   50,000   AA+/Aaa       Massachusetts Health and Educational Facilities 
                            Authority Revenue, Massachusetts Institute of 
                            Technology, 5.0%, 2023                             44,426 
  100,000   AAA/Aaa       Massachusetts Housing Finance Agency Residential 
                            Development, FNMA Collateralized, 6.25%, 2014     101,589 
  100,000   AAA/Aaa       Massachusetts Municipal Wholesale Electric Company 
                            Revenue, AMBAC Insured, 5.1%, 2007                 98,838 
   50,000   AA-/Aa        Massachusetts Port Authority Revenue, 6.0%, 2013     50,882 
   50,000   AA/A1         Massachusetts State Special Obligation Revenue,
                            6.0%, 2013                                         50,637 
   50,000   A/A           Massachusetts Water Resources Authority Revenue, 
                            6.25%, 2010                                        52,016 
   50,000   AAA/Aaa       Monson General Obligation, MBIA Insured, 5.3%,
                            2006                                               51,217 
   50,000   AAA/Aaa       Sandwich General Obligation, AMBAC Insured,
                            5.2%, 2005                                         50,981 
  100,000   AAA/Aaa       South Essex Sewer District, General Obligation,
                            MBIA Insured, 6.5%, 2006                          112,223 
   75,000   NR/Aaa        Weston General Obligation, 5.8%, 2012                76,679 
                                                                          $ 1,224,084 
                          PUERTO RICO -- 18.4% 
   25,000   A/Baa1        Commonwealth of Puerto Rico General Obligation,
                            5.1%,  2002                                   $    25,319 
   50,000   A/Baa1        Commonwealth of Puerto Rico General Obligation,
                            5.2%,  2003                                        50,690 
   50,000   A/Baa1        Commonwealth of Puerto Rico General Obligation,
                            6.0%,  2022                                        49,473 
   75,000   AAA/Aaa       Puerto Rico Electric Power Authority Revenue,
                            5.0%,  2004                                        76,007 
   75,000   A+/A          Puerto Rico Telephone Authority Revenue, 5.4%,
                            2008                                               74,861 
                                                                          $   276,350 
                            TOTAL INVESTMENT INTAX-EXEMPT SECURITIES
                             -- 100% 
                             (Total Cost $1,465,165) (a)(b)                $1,500,434 

</TABLE>
 + The concentration of investments in securities by type of 
   obligation/market sector is as follows: 

<TABLE>
     <S>                                                               <C>
     General Obligation                                                 14.2% 
     Insured                                                            22.3% 
     Revenue Bonds: 
        Transportation Revenue                                           9.0% 
        Power Revenue                                                    3.3% 
        Housing Revenue                                                  4.4% 
        Education Revenue                                                4.1% 
        Electric, Water & Sewer Revenue                                  2.2% 
        Sales Tax Revenue                                                2.2% 
        Other Revenue                                                    3.2% 
     Reserves                                                           35.1% 
     Total                                                             100.0% 
</TABLE>

The accompanying notes are an integral part of these financial statements. 

                                     3 
<PAGE>

SCHEDULE OF INVESTMENTS -- PIONEER MASSACHUSETTS DOUBLE TAX-FREE FUND -- 
MARCH 31, 1996 

    NR Not Rated. 
(a) At March 31, 1996, the net unrealized gain on investments based on 
    cost for federal income tax purposes of $1,465,165 was as follows: 

<TABLE>
<S>                                                       <C>
Aggregate gross unrealized gain for all investments in which 
there is an excess of value over tax cost                 $ 38,047 

Aggregate gross unrealized loss for all investments in which 
there is an excess of tax cost over value                   (2,778) 

Net unrealized gain                                        $35,269 
</TABLE>

(b) At March 31, 1996, the Fund had a net capital loss carryforward of 
    $57,726 (see Note 6). 

    Purchases and sales of securities (excluding temporary cash 
    investments) for the six months ended March 31, 1996 aggregated 
    $728,189 and $3,713,895, respectively. 

The accompanying notes are an integral part of these financial statements. 

                                     4 
<PAGE>
PIONEER MASSACHUSETTS DOUBLE TAX-FREE FUND 
BALANCE SHEET -- MARCH 31, 1996 

<TABLE>
<S>                                                   <C>
ASSETS: 
   Investments in tax-exempt securities, at 
     value (cost $1,465,165; see Schedule of 
     Investments and Note 1)                          $  1,500,434 
   Cash                                                    813,387 
   Interest receivable                                      22,466 
   Due from Pioneering Management Corporation 
     (Note 2)                                               12,787 
   Other                                                     6,181 
       Total assets                                   $  2,355,255 

LIABILITIES: 
   Payables -- 
     Investment securities purchased                  $    231,115 
     Fund shares repurchased                                79,323 
     Dividends                                                 865 
   Due to affiliates (Notes 3 and 4)                         2,976 
   Accrued expenses                                          9,223 
       Total liabilities                              $    323,502 

NET ASSETS: 
   Paid-in capital (Note 1)                           $  2,054,210 
   Accumulated net realized loss on investments            (57,726) 
   Net unrealized gain on investments                       35,269 
       Total net assets (equivalent to $11.00 
        per share based on 184,777 fund shares 
        outstanding -- unlimited number of 
        shares authorized)                            $ 2,031,753 
</TABLE>

PIONEER MASSACHUSETTS DOUBLE TAX-FREE FUND 
STATEMENT OF OPERATIONS 
FOR THE SIX MONTHS ENDED MARCH 31, 1996 

<TABLE>
<S>                                                     <C>
INVESTMENT INCOME (NOTE 1): 
   Interest                                             $  115,522 

EXPENSES: 
   Management fees (Note 2)                             $   13,424 
   Distribution fees (Note 4)                                  244 
   Transfer agent fees (Note 3)                              1,442 
   Registration fees                                         4,476 
   Professional fees                                        17,341 
   Accounting (Note 2)                                      17,024 
   Custodian fees                                            5,029 
   Printing                                                  3,294 
   Fees and expenses of nonaffiliated trustees               6,432 
   Regulatory reporting                                      3,565 
   Miscellaneous                                             3,458 
     Total expenses                                     $   75,729 
   Less fees paid indirectly (Note 5)                       (2,326) 
   Less management fees waived and expenses 
     assumed by Pioneering Management 
     Corporation (Note 2)                                  (62,225) 
   Net expenses                                         $   11,178 
     Net investment income                              $  104,344 

REALIZED AND UNREALIZED GAIN (LOSS) ON 
  INVESTMENTS: 
   Net realized loss on investments                     $   (1,963) 
   Change in net unrealized loss on investments             35,642 
       Net gain on investments                          $   33,679 
          Net increase in net assets resulting 
           from operations                               $ 138,023 
</TABLE>

The accompanying notes are an integral part of these financial statements. 

                                     5 
<PAGE>
PIONEER MASSACHUSETTS DOUBLE TAX-FREE FUND 
STATEMENTS OF CHANGES IN NET ASSETS 
FOR THE SIX MONTHS ENDED MARCH 31, 1996 AND THE YEAR ENDED SEPTEMBER 30, 
1995 

<TABLE>
<CAPTION>
                                                   SIX MONTHS 
                                                     ENDED            YEAR ENDED 
                                                 MARCH 31, 1996   SEPTEMBER 30, 1995 
<S>                                              <C>                <C>        
FROM OPERATIONS: 
   Net investment income                          $   104,344       $    207,218 
   Net realized loss on investments                    (1,963)           (48,347) 
   Change in net unrealized gain/loss on 
     investments                                       35,642            303,884 
     Net increase (decrease) in net assets 
       resulting from operations                  $   138,023       $    462,755 

DISTRIBUTIONS TO SHAREHOLDERS: 
   From net investment income ($0.26 and $0.55 
     per share, respectively)                     $  (104,344)      $   (207,218) 
     Decrease in net assets resulting from 
       distributions to shareholders              $  (104,344)      $   (207,218) 

FROM FUND SHARE 
  TRANSACTIONS:                 SHARES 
   Net proceeds from 
     sale of shares        24,850      54,141     $   277,770       $    586,518 
   Net asset value of 
     shares issued to 
     shareholders in 
     reinvestment of 
     dividends              7,740      17,958          87,245            189,671 
   Cost of shares 
     repurchased         (265,031)    (21,786)     (2,949,964)          (222,614) 
     Net increase 
       (decrease) in net 
       assets resulting 
       from fund share 
       transactions      (232,441)     50,313     $(2,584,949)      $    553,575 
       Net increase (decrease) in net assets      $(2,551,270)      $    809,112 
NET ASSETS: 
   Beginning of period                              4,583,023          3,773,911 
   End of period                                  $ 2,031,753       $  4,583,023 
</TABLE>

The accompanying notes are an integral part of these financial statements. 

                                     6 
<PAGE>
PIONEER MASSACHUSETTS DOUBLE TAX-FREE FUND 
FINANCIAL HIGHLIGHTS 
SELECTED DATA FOR A SHARE OUTSTANDING FOR THE PERIODS PRESENTED 

<TABLE>
<CAPTION>
                         SIX MONTHS 
                           ENDED        YEAR ENDED      YEAR ENDED     PERIOD ENDED 
                         MARCH 31,    SEPTEMBER 30,   SEPTEMBER 30,   SEPTEMBER 30, 
                            1996           1995            1994           1993++ 
<S>                      <C>            <C>             <C>             <C>
Net asset value, 
 beginning of period     $     10.98    $     10.29     $     11.58     $     11.12 
Increase (decrease) 
  from investment 
  operations: 
   Net investment 
     income              $      0.26    $      0.55     $      0.58     $      0.37 
   Net realized and 
     unrealized gain 
     (loss) on 
     investments                0.02           0.69           (1.29)           0.46 
     Total increase 
       (decrease) from 
       investment 
       operations        $      0.28    $      1.24     $     (0.71)    $      0.83 
Distributions to 
  shareholders from: 
   Net investment 
     income                    (0.26)         (0.55)          (0.58)          (0.37) 
Net increase 
  (decrease) in net 
  asset value            $      0.02    $      0.69     $     (1.29)    $      0.46 
Net asset value, end 
  of period              $     11.00    $     10.98     $     10.29     $     11.58 
Total return*                  2.54%         12.36%          (6.33)%          7.58% 
Ratio of net expenses 
  to average net 
  assets                       0.61%**+       0.50%           0.35%           0.00%** 
Ratio of net 
  investment income to 
  average net assets           4.59%**+       5.15%           5.23%           5.22%** 
Portfolio turnover 
  rate                        36.18%**       16.58%           2.65%           0.00% 
Net assets, end of 
  period                 $ 2,031,753    $ 4,583,023     $ 3,773,911     $ 3,176,176 
Ratios assuming no 
  waiver of management 
  fees and assumption 
  of expenses by PMC 
  and no reduction for 
  fees paid 
  indirectly: 
   Net expenses                3.41%**        2.95%           3.45%           4.89%** 
   Net investment 
     income                    1.79%**        2.70%           2.13%           0.33%** 
Ratios assuming 
  waiver of management 
  fees and assumption 
  of expenses by PMC 
  and reduction for 
  fees paid 
  indirectly: 
   Net expenses                0.50%**      --              --              -- 
   Net investment 
     income                    4.70%**      --              --              -- 

</TABLE>


 * Assumes initial investment at net asset value at the beginning of each 
   period, reinvestment of all distributions, the complete redemption of 
   the investment at net asset value at the end of each period and no 
   sales charges. Total return would be reduced if sales charges were 
   taken into account. 

** Annualized. 

 + Ratios include fees paid indirectly. 

++ The Fund commenced operations on February 19, 1993. 

The accompanying notes are an integral part of these financial statements. 

                                     7 
<PAGE>
NOTES TO FINANCIAL STATEMENTS -- MARCH 31, 1996 

     1. Pioneer Massachusetts Double Tax-Free Fund (the Fund), one of 
three funds that composes Pioneer Tax- Free State Series Trust, is a 
Massachusetts business trust registered under the Investment Company Act 
of 1940 as a non-diversified, open-end management investment company (see 
Note 6). The investment objective of the Fund is to provide a high level 
of current income exempt from federal and personal state income taxes. As 
of March 31, 1996, The Pioneer Group, Inc. (PGI) was the beneficial owner 
of approximately 82% of the outstanding shares of the Fund. 

    The Fund's financial statements have been prepared in conformity with 
generally accepted accounting principles that require the management of 
the Fund to, among other things, make estimates and assumptions that 
affect the reported amounts of assets and liabilities, the disclosure of 
contingent assets and liabilities at the date of the financial statements, 
and the reported amounts of revenues and expenses during the reporting 
periods. Actual results could differ from those estimates. The following 
is a summary of significant accounting policies consistently followed by 
the Fund, which are in conformity with those generally accepted in the 
investment company industry. 

    A. Security Valuation -- Security transactions are recorded on trade 
date. Securities are valued based on valuations furnished by an 
independent pricing service that utilizes a matrix system. This matrix 
system reflects such factors as security prices, yields, maturities and 
ratings and is supplemented by dealer and exchange quotations and fair 
market value information from other sources, as required. Market discount 
and premium are accreted or amortized daily on a straight-line basis. 
Original issue discount is accreted daily into interest income on a 
yield-to- maturity basis with a corresponding increase in the cost basis 
of the security. Temporary cash investments are valued at amortized cost. 
Interest income is recorded on the accrual basis. 

    Gains and losses on sales of investments are calculated on the 
"identified cost" method for both financial reporting and federal income 
tax purposes. It is the Fund's practice to first select for sale those 
securities that have the highest cost and also qualify for long-term 
capital gain or loss treatment for tax purposes. 

    B. Federal Taxes -- It is the Fund's policy to comply with the 
requirements of the Internal Revenue Code applicable to regulated 
investment companies and to distribute all of its taxable income and net 
realized capital gains, if any, to its shareholders. Therefore, no federal 
income tax provision is required. 

    The characterization of distributions to shareholders for financial 
reporting purposes is determined in accordance with federal income tax 
rules. Therefore, the source of the Fund's distributions may be shown in 
the accompanying financial statements as either from or in excess of net 
investment income or net realized gain on investment transactions, or from 
paid-in capital, depending on the type of book/tax differences that may 
exist. 

    C. Fund Shares -- The Fund records sales and repurchases of fund 
shares on trade date. Shares are sold and redeemed on a continuous basis 
at net asset value per share. Net losses, if any, as a result of 
cancellations, are absorbed by Pioneer Funds Distributor, Inc. (PFD), the 
principal underwriter for the Fund and an indirect wholly owned subsidiary 
of PGI. PFD earned $2,112 in underwriting commissions on the sale of fund 
shares during the six months ended March 31, 1996. The Fund declares as 
daily dividends substantially all of its net investment income. All 
dividends are paid on a monthly basis. Short-term capital gain 
distributions, if any, may be declared with the daily dividends. 

    2. Pioneering Management Corporation (PMC), the Fund's investment 
adviser, manages the Fund's portfolio and is a wholly owned subsidiary of 
PGI. Management fees are calculated daily at the annual rate of 0.60% of 
the Fund's average daily net assets. 

    PMC has agreed not to impose a portion of its management fees and to 
assume other operating expenses for the Fund to the extent necessary to 
limit the Fund's expenses to an annual rate of 0.50% of the Fund's average 
daily net assets up to $20 million; 0.55% of the next $5 million; 0.60% of 
the next $5 million; 0.65% of the next $5 million; 0.70% of the next $5 
million; and 0.75% of the excess over $40 million. PMC's agreement is 
temporary and voluntary and may be revised or terminated at any time. 

    In addition, under the management agreement, certain other services 
and costs, including accounting, regulatory reporting and insurance 
premiums, are paid by the Fund. 

    3. Pioneering Services Corporation (PSC), a wholly owned subsidiary of 
PGI, provides substantially all transfer agent and shareholder services to 
the Fund at negotiated rates. Included in due to affiliates is $1,481 in 
transfer agent fees payable to PSC at March 31, 1996. 

                                     8 
<PAGE>

NOTES TO FINANCIAL STATEMENTS -- MARCH 31, 1996 -- CONTINUED 

     4. The Fund adopted a Plan of Distribution (the Plan) that allows 
for the Fund to reimburse PFD for expenditures to finance activities 
primarily intended to result in the sale of fund shares. The Plan provides 
for reimbursement in an amount not to exceed 0.25% of the Fund's average 
daily net assets, including a service fee of 0.15% of the Fund's average 
daily net assets. Included in due to affiliates is $1,495 in distribution 
fees payable to PFD at March 31, 1996. 

    5. The Fund has entered into certain expense offset arrangements 
resulting in a reduction in the Fund's total expenses. For the six months 
ended March 31, 1996, the Fund's expenses were reduced by $2,326 under 
such arrangements. 

    6. As approved by the Board of Trustees, on April 10, 1996, the 
Pioneer Tax-Free State Series Trust ceased operations following the 
distribution of each Fund's remaining assets to shareholders. As a result, 
$31,362 of the Fund's capital loss carryforward of $57,726, as of March 31 
1996, was not utilized during the period from April 1, 1996 to April 10, 
1996. The liquidation of the Trust has no effect on any of the other 
Pioneer mutual funds. 

                                     9 
<PAGE>

REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS 

TO THE SHAREHOLDERS AND THE BOARD OF TRUSTEES OF 
    PIONEER MASSACHUSETTS DOUBLE TAX-FREE FUND: 

We have audited the accompanying balance sheet of Pioneer Massachusetts 
Double Tax-Free Fund (one of the portfolios that composes Pioneer Tax-Free 
State Series Trust), including the schedule of investments as of March 31, 
1996, and the related statement of operations, statements of changes in 
net assets and financial highlights for the periods presented. These 
financial statements and financial highlights are the responsibility of 
the Trust's management. Our responsibility is to express an opinion on 
these financial statements and financial highlights based on our audits. 

We conducted our audits in accordance with generally accepted auditing 
standards. Those standards require that we plan and perform the audit to 
obtain reasonable assurance about whether the financial statements and 
financial highlights are free of material misstatement. An audit includes 
examining, on a test basis, evidence supporting the amounts and 
disclosures in the financial statements. Our procedures included 
confirmation of securities owned as of March 31, 1996 by correspondence 
with the custodian. An audit also includes assessing the accounting 
principles used and significant estimates made by management, as well as 
evaluating the overall financial statement presentation. We believe that 
our audits provide a reasonable basis for our opinion. 

In our opinion, the financial statements and financial highlights referred 
to above present fairly, in all material respects, the financial position 
of Pioneer Massachusetts Double Tax-Free Fund of Pioneer Tax-Free State 
Series Trust as of March 31, 1996, the results of its operations, the 
changes in its net assets and financial highlights for the periods 
presented, in conformity with generally accepted accounting principles. 

                                                        ARTHUR ANDERSEN LLP 

Boston, Massachusetts 
April 26, 1996 

                                    10 
<PAGE>

                      TAX TREATMENT OF DISTRIBUTIONS 
                MADE DURING THE PERIOD ENDED MARCH 31, 1996 

During the period ended March 31, 1996, Pioneer Massachusetts Double 
Tax-Free Fund paid the following distributions from net investment income: 


<TABLE>
<CAPTION>
                                                            DISTRIBUTIONS 
PAYMENT DATE                                                  PER SHARE 
<S>                                                           <C>
10/31/95                                                       $ 0.043 
11/30/95                                                         0.045 
12/29/95                                                         0.046 
01/31/95                                                         0.043 
02/29/96                                                         0.043 
03/29/96                                                         0.042 
                                                               $ 0.262 
</TABLE>

Of the Fund's total per share distribution for this period, 100% is 
tax-exempt and should be reported on Form 1040, line 8b, U.S. Individual 
Tax Return. 

TRUSTEES' FEES, PRINCIPAL SHAREHOLDERS AND SHARE OWNERSHIP OF 
TRUSTEES AND OFFICERS (UNAUDITED) 

    The aggregate direct remuneration paid on behalf of the Fund to 
nonaffiliated trustees and officers during the period ended March 31, 1996 
was approximately $6,000 plus expenses incurred in attending trustees 
meetings of approximately $700. Fees of trustees who are affiliated with 
or "interested persons" of Pioneering Management Corporation and Pioneer 
Funds Distributor, Inc., investment adviser and principal underwriter, 
respectively, of the Fund ($1,000 in 1996) are reimbursed to the Fund by 
Pioneering Management Corporation in accordance with the management 
contract with the Fund. The Pioneer Group, Inc., the parent company of 
Pioneering Management Corporation and Pioneer Funds Distributor, Inc., is 
a publicly held corporation of which Mr. Cogan, Chairman and President of 
the Fund, owned approximately 15% of the outstanding shares of capital 
stock at March 31, 1996. 

                                    11 
<PAGE>
PIONEER MASSACHUSETTS 
DOUBLE TAX-FREE FUND 
60 State Street 
Boston, Massachusetts 02109 

OFFICERS 
JOHN F. COGAN, JR., Chairman and President 
DAVID D. TRIPPLE, Executive Vice President 
KATHLEEN D. McCLASKEY, Vice President 
WILLIAM H. KEOUGH, Treasurer 
JOSEPH P. BARRI, Secretary 

TRUSTEES 
JOHN F. COGAN, JR. 
RICHARD H. EGDAHL, M.D. 
MARGARET B. W. GRAHAM 
JOHN W. KENDRICK 
MARGUERITE A. PIRET 
DAVID D. TRIPPLE 
STEPHEN K. WEST 
JOHN WINTHROP 

INDEPENDENT PUBLIC ACCOUNTANTS 
ARTHUR ANDERSEN LLP 

INVESTMENT ADVISER 
PIONEERING MANAGEMENT CORPORATION 

PRINCIPAL UNDERWRITER 
PIONEER FUNDS DISTRIBUTOR, INC. 

CUSTODIAN 
BROWN BROTHERS HARRIMAN & CO. 

LEGAL COUNSEL 
HALE AND DORR 

SHAREHOLDER SERVICES AND TRANSFER AGENT 
PIONEERING SERVICES CORPORATION 
60 State Street 
Boston, Massachusetts 02109 

Please call Pioneer for information on: 
Existing accounts, new accounts, 
prospectuses, applications, and 
service forms................................ 1-800-225-6292 
Fund yields and prices....................... 1-800-225-4321 
Toll-free fax................................ 1-800-225-4240 
Retirement plans............................. 1-800-622-0176 
Telecommunications Device for the 
Deaf (TDD)................................... 1-800-225-1997 

When distributed to persons who are not shareowners of the Fund, this report 
must be accompanied by an official prospectus that discusses the objectives, 
policies, sales charges and other information about the Fund. 

0596-3322 
(C)Pioneer Funds Distributor, Inc. 


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