PIONEER TAX FREE STATE SERIES TRUST
N-30B-2, 1995-05-25
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PIONEER CALIFORNIA
DOUBLE TAX-FREE FUND

PIONEER NEW YORK
TRIPLE TAX-FREE FUND

PIONEER MASSACHUSETTS
DOUBLE TAX-FREE FUND

SEMIANNUAL REPORT
MARCH 31, 1995

DEAR SHAREOWNERS,

Pioneer's three single-state municipal bond funds completed the first six
months of their third fiscal year on March 31, 1995. This report details
the much- improved environment for municipal bond investing during the
period, and highlights the strong performance of:

* PIONEER CALIFORNIA DOUBLE TAX-FREE FUND, exempt from federal and Cali-
  fornia state personal income taxes.

* PIONEER NEW YORK TRIPLE TAX-FREE FUND, exempt from federal, New York
  state and New York City personal income taxes.

* PIONEER MASSACHUSETTS DOUBLE TAX-FREE FUND, exempt from federal and Mas-
  sachusetts state personal income taxes.

Over the past six months, the Federal Reserve (the Fed) raised short-term
interest rates twice, on November 15 and February 1, bringing the federal
funds rate to a three-year high of 6.0%. The Fed's decision to raise rates
was based on its concern about the pace of economic growth and subsequent
inflation. Investors, trying to come to terms with these matters, added to
the bond market's turmoil, as reflected by its poor performance in 1994.
However, it now appears that the Fed's efforts are beginning to have the
desired effect. Many economic indicators have slowed (for example, home
sales, consumer spending, construction spending), while financial markets
have gained strength. Even the Fed's rate hike on February 1 did little to
temper the positive momentum in the bond market; if anything, many inves-
tors saw the increase as a sign of the Fed's determination to keep the
economy from expanding too quickly.

   
Improving conditions throughout the bond market brought the greatest bene-
fits to municipal investors, in the form of higher prices. In addition,
the record low supply of securities made available in 1995 helped further
fuel the municipal market. The new-issue supply introduced in the first
quarter of 1995 was 46% lower than one year earlier. The volume of new is-
sues currently is at its lowest level in five years, suggesting that mu-
nicipal bonds should continue to outperform taxable bonds in 1995. The ac-
companying chart shows that municipal bonds generated stronger total re-
turns than the broader taxable bond market for periods through March 31.

                MUNICIPAL BONDS OUTPERFORMED TAXABLE BONDS
    

DESCRIPTION OF BAR GRAPH

Bar graph showing total returns as of March 31, 1995 for Lehman Brothers
Aggregate Bond Index and Lehman Brothers Municipal Bond Index. The figures
used for the bar graph are as follows:

<TABLE>
<CAPTION>
                                          1 MONTH    3 MONTHS   6 MONTHS   1 YEAR
<S>                                       <C>        <C>        <C>        <C>
LEHMAN BROTHERS AGGREGATE BOND INDEX        0.61%       5.04%      5.44%    4.99%
LEHMAN BROTHERS MUNICIPAL BOND INDEX        1.15%       7.07%      5.54%    7.43%
</TABLE>

                  THE OUTLOOK FOR TAX-SENSITIVE INVESTORS

The Fed's two increases in short-term interest rates over the past six
months show its continued determination to keep inflation low. With eco-
nomic indicators finally pointing to a slowdown, further interest rate
increases should be minimal. Any additional increases that may occur over
the near term should not create the widespread volatility experienced in
last year's bond market. Of course, we will look for signs of economic
growth and inflation, just as we will watch for other events that could
have an impact on the overall bond market, such as the weakening dollar,
economic activity overseas and the potential for increased consumer spend-
ing stemming from IRS tax refunds.

Past events remind us that investing can be volatile in the short term.
However, they also show us how temporary conditions -- especially negative
ones -- can create buying opportunities and set the stage for long- term
rewards. Regardless of market movements, your Funds' management will con-
tinue to monitor and adjust the portfolios, working to maintain the Funds'
objective of providing a steady income stream. We are encouraged by the
current environment for municipal investing, and expect that the Funds --
and shareowners -- will benefit accordingly.

The following pages provide details about your Fund, as well as its unau-
dited list of portfolio holdings as of March 31, 1995. If you have any
questions about your Fund, please contact your financial adviser, or call
Pioneer at 1-800-225-6292.

   
Respectfully,
    

John F. Cogan, Jr.

John F. Cogan, Jr.
Chairman and President

May 4, 1995

PIONEER CALIFORNIA DOUBLE TAX-FREE FUND

As of March 31, 1995, we report the following for your Fund:

* A 30-day SEC yield of 5.19%.1 This yield measures net investment income
  and is calculated using a standard formula prescribed by the Securities
  and Exchange Commission. Your Fund's tax-free yield was equivalent to a
  taxable yield of 9.65% at the end of the period, based on the maximum
  combined federal and California personal income tax rate of 46.24%.

   
* Shareowners received tax-exempt dividends of $0.28 per share for the pe-
  riod.
    

* Net asset value stood at $10.63 per share, versus $10.22 six months ear-
  lier.

   
* The Fund's six-month total return was 6.92% based on net asset value and
  3.18% based on public offering price. Total return represents the change
  in share price and assumes reinvestment of all distributions at net
  asset value. The Fund's longer-term total returns through March 31,
  1995, were as follows:
    

<TABLE>
<CAPTION>
                                           AVERAGE ANNUAL TOTAL RETURN
                                  NET ASSET VALUE        PUBLIC OFFERING PRICE*
<S>                               <C>                    <C>
Life-of-Fund (2/19/93)                  2.80%                     1.08%
1 Year                                  6.18                      2.49
</TABLE>

As of March 31, 1995, your Fund's portfolio holdings had an average qual-
ity rating of AA. This focus on high quality provides a level of comfort
to conservative investors who do not want to invest in anything less than
investment-grade bonds. The Fund's management follows strict quality
guidelines, avoiding lower-quality investments as well as speculative se-
curities. The Fund also currently avoids issues subject to the Alternative
Minimum Tax (AMT).

   
Over the semiannual period, we added bonds with seven-to-10 years to matu-
rity to take advantage of their strong performance. We increased the
Fund's weighting in bonds in the 10- to 20-year range. We decreased the
Fund's weighting in longer-term securities with a maturity of 20 years or
more, to 33% on March 31 from 44% as of September 30. While longer- term
bonds provide high monthly income, they are more volatile than
intermediate-term securities. And, in the current interest rate environ-
ment, intermediate-term bonds are providing a competitive dividend stream.
By the end of the six-month period, the Fund's portfolio had an average
effective life of 16 years, versus 19 years on September 30, 1994.
    

The Fund remains diversified across many market sectors within California.
As of March 31, the Fund had a sizable weighting in water and sewer bonds,
totaling approximately 23% of the portfolio. These bonds continue to per-
form solidly. Because of the essential services they provide, their per-
formance is not directly tied to the State's lackluster economy.

   
During 1994, Orange County's fiscal problems attracted much publicity. The
County declared bankruptcy after a series of speculative investments led
to significant losses in its investment pool. Your Fund does not own any
direct obligations of Orange County, although two holdings in the portfo-
lio -- Orange County Local Transportation Authority Sales Tax Revenue
Bonds and South Coast Water District Revenue Bonds -- had investments in
the pool that was managed by Orange County. Nonetheless, the County's
problems have not affected the performance of these specific bonds. The
two bonds have maintained their high-quality ratings of AA and A+, respec-
tively. In addition, Orange County Local Transportation Authority is
backed by sales tax revenues, and South Coast Water District is backed by
user-service charges and property taxes. These bonds have made every one
of their interest payments, and we expect they will do so in the future.
Your management plans to hold these bonds in the Fund until we are confi-
dent we can realize maximum value by selling them.
    

                             PORTFOLIO QUALITY
                             (MARCH 31, 1995)

PIE CHART
<TABLE>
<S>                                                <C>
CASH AND CASH EQUIVALENTS                           4%
A                                                  21%
AA                                                 45%
AAA                                                30%
</TABLE>


                            PORTFOLIO MATURITY
                             (MARCH 31, 1995)

PIE CHART
<TABLE>
<S>                                                <C>
0-5 YEARS                                           4%
5-7 YEARS                                           4%
7-10 YEARS                                          4%
10-20 YEARS                                        55%
20+ YEARS                                          33%
</TABLE>

   
1 The investment adviser temporarily waived its management fees and ab-
  sorbed certain expenses, otherwise the Fund's total return would have
  been lower and its SEC yield would have been 2.64%.
* Assumes deduction of the maximum 3.5% sales charge.
  Past performance does not guarantee future results. Return and share
  price fluctuate so that an investor's shares, when redeemed, may be
  worth more or less than their original cost. A portion of income may be
  subject to state and local taxes, although the Fund intends to minimize
  any taxable income.
    

PIONEER NEW YORK TRIPLE TAX-FREE FUND

We report the following for your Fund as of March 31, 1995:

   
* A 30-day SEC yield of 5.13%.1 This yield measures net investment income
  and is calculated using a standard formula prescribed by the Securities
  and Exchange Commission. Your Fund's tax-free yield was equivalent to a
  taxable yield of 9.19% at the end of the period, based on the 44.19%
  maximum combined federal and New York state personal income tax rate,
  and 9.66% based on the 46.88% maximum combined federal, New York state
  and New York City tax rate.

* Shareowners received tax-exempt dividends of $0.27 per share for the pe-
  riod.
    

* Net asset value stood at $10.73 per share, versus $10.39 six months ear-
  lier.

   
* The Fund's six-month total return was 6.07% based on net asset value and
  2.32% based on public offering price. Total return represents the change
  in share price and assumes reinvestment of all distributions at net
  asset value. The Fund's longer-term total returns through March 31,
  1995, were as follows:
    

<TABLE>
<CAPTION>
                                           AVERAGE ANNUAL TOTAL RETURN
                                  NET ASSET VALUE        PUBLIC OFFERING PRICE*
<S>                               <C>                    <C>
Life-of-Fund (2/19/93)                  3.34%                     1.60%
1 Year                                  6.13                      2.38
</TABLE>

Your Fund invests only in high-quality securities; the average quality
rating in the portfolio was AA on March 31, 1995. This high-quality focus
provides a level of comfort to conservative investors who do not want ex-
posure to anything less than investment-grade bonds. The Fund's management
adheres to strict quality guidelines, avoiding lower-quality investments
as well as speculative securities. The Fund also currently avoids issues
subject to the Alternative Minimum Tax (AMT).

By the end of the six-month period, the Fund's portfolio had an average
effective life of 13 years, versus 16 years on September 30, 1994. While
your Fund still holds longer-term securities, we significantly decreased
the weighting in securities with a maturity of 20 years or more, from 23%
as of September 30 to 9% on March 31. While longer-term bonds provide
solid monthly income, they are more volatile than intermediate securities.
And, in the current interest rate environment, intermediate-term bonds are
providing a very competitive dividend stream. We therefore increased the
Fund's intermediate position (bonds in the seven-to-10-year range), from
5% on September 30 to 11% on March 31.

   
Since our last report to you, New York residents elected a new governor,
George Pataki, who has proposed a budget calling for lower taxes on resi-
dents and businesses. The proposal has been designed to help the State's
stagnant economy rebuild and become more competitive. The key ingredients
of the proposed budget include a 25% reduction in the top personal income
tax rate over four years, as well as a reduction in spending to accommo-
date reduced revenue. While the new administration's proposal is balanced
and based on realistic economic projections, its fate is unresolved. Your
management will monitor this situation as it continues to evolve.
    

Your Fund remains well-diversified across many market sectors within New
York. Over the six-month period, your management increased the Fund's
weighting in education bonds of private institutions and essential-
services bonds. The performance of these high-quality securities tends not
to be directly tied to the State's economy, which we think makes the most
sense for your Fund as we closely watch the progress and effectiveness of
the State's new administration.

                             PORTFOLIO QUALITY
                             (MARCH 31, 1995)

PIE CHART
<TABLE>
<S>                                                    <C>
CASH AND CASH EQUIVALENTS                               3%
A                                                      34%
AA                                                     29%
AAA                                                    34%
</TABLE>

                            PORTFOLIO MATURITY
                             (MARCH 31, 1995)

PIE CHART
<TABLE>
<S>                                                    <C>
0-7 YEARS                                               3%
7-10 YEARS                                             11%
10-20 YEARS                                            77%
20+ YEARS                                               9%
</TABLE>

   
1 The investment adviser temporarily waived its management fees and ab-
  sorbed certain expenses, otherwise the Fund's total return would have
  been lower and its SEC yield would have been 1.86%.
* Assumes deduction of the maximum 3.5% sales charge.
  Past performance does not guarantee future results. Return and share
  price fluctuate so that an investor's shares, when redeemed, may be
  worth more or less than their original cost. A portion of income may be
  subject to state and local taxes, although the Fund intends to minimize
  any taxable income.
    

PIONEER MASSACHUSETTS DOUBLE TAX-FREE FUND

We report the following for your Fund as of March 31, 1995:

* A 30-day SEC yield of 5.14%.1 This yield measures net investment income
  and is calculated using a standard formula prescribed by the Securities
  and Exchange Commission. Your Fund's tax-free yield was equivalent to a
  taxable yield of 9.67% at the end of the period, based on the 46.85%
  maximum combined federal and Massachusetts personal income tax rate.

   
* Shareowners received tax-exempt dividends of $0.28 per share for the pe-
  riod.
    

* Net asset value stood at $10.75 per share, versus $10.29 six months ear-
  lier.

   
* The Fund's six-month total return was 7.33% based on net asset value and
  3.61% based on public offering price. Total return represents the change
  in share price and assumes reinvestment of all distributions at net
  asset value. The Fund's longer-term total returns through March 31,
  1995, were as follows:
    

<TABLE>
<CAPTION>
                                           AVERAGE ANNUAL TOTAL RETURN
                                  NET ASSET VALUE        PUBLIC OFFERING PRICE*
<S>                               <C>                    <C>
Life-of-Fund (2/19/93)                  3.77%                     2.05%
1 Year                                  7.49                      3.76
</TABLE>

Your Fund's portfolio holdings had an average quality rating of AA on
March 31, 1995. This high-quality focus provides a level of comfort to
conservative investors uncomfortable with exposing their investment to
anything less than investment-grade bonds. The Fund's management avoids
lower-quality investments, as well as speculative securities. The Fund
also currently avoids issues subject to the Alternative Minimum Tax (AMT).

By the end of the six-month period, the Fund's holdings had an average ef-
fective life of 15 years, versus 17 years on September 30, 1994. While the
Fund still holds a sizable weighting in longer-term securities to maintain
a strong monthly dividend, we significantly increased the number of
shorter-term holdings during the period. Specifically, we augmented the
Fund's position in the seven-to-10-year range, from 4% on September 30 to
12% on March 31. These investments offer greater liquidity and share price
stability than longer-term bonds, which should help your Fund's management
take advantage of buying opportunities and minimize changes to the Fund's
net asset value.

   
The Fund remains diversified across market sectors within the Common-
wealth. As of March 31, 23% of the portfolio was invested in bonds issued
by prestigious colleges and universities. These educational institutions
remain in high demand with students throughout this country, and in other
parts of the world, because of their high academic standing. The fiscal
well-being of the institutions tends to come from large endowments and in-
dependent financial resources and, therefore, is not dependent on Massa-
chusetts' economy.
    

                             PORTFOLIO QUALITY
                             (MARCH 31, 1995)

PIE CHART
<TABLE>
<S>                                                    <C>
CASH AND CASH EQUIVALENTS                               2%
A                                                      42%
AA                                                     18%
AAA                                                    38%
</TABLE>

                            PORTFOLIO MATURITY
                             (MARCH 31, 1995)

PIE CHART
<TABLE>
<S>                                                    <C>
0-7 YEARS                                               3%
7-10 YEARS                                             12%
10-20 YEARS                                            70%
20+ YEARS                                              15%
</TABLE>

   
1 The investment adviser temporarily waived its management fees and ab-
  sorbed certain expenses, otherwise the Fund's total return would have
  been lower and its SEC yield would have been 2.01%.
* Assumes deduction of the maximum 3.5% sales charge.
  Past performance does not guarantee future results. Return and share
  price fluctuate so that an investor's shares, when redeemed, may be
  worth more or less than their original cost. A portion of income may be
  subject to state and local taxes, although the Fund intends to minimize
  any taxable income.
    

SCHEDULE OF INVESTMENTS -- PIONEER CALIFORNIA DOUBLE TAX-FREE FUND --
MARCH 31, 1995 (UNAUDITED)

   
<TABLE>
<CAPTION>
              STANDARD
PRINCIPAL     & POOR'S
 AMOUNT        RATING                   INVESTMENTS+                    VALUE
<S>           <C>         <C>                                         <C>
                          TAX-EXEMPT SECURITIES -- 97.1%
                          CALIFORNIA -- 88.5%
$100,000      AA-         Beverly Hills Public Financing Authority    $   97,763
                            Revenue, 6.0%, 2022
 150,000      AA-         Burlingame Elementary School District          138,593
                            General Obligation, 5.5%, 2013
 250,000      AA          California State Department Water              257,815
                            Resources, Central Valley Project
                            Revenue, 6.0%, 2007
 250,000      AA          California Educational Facilities Author-      239,878
                            ity Revenue, University of Southern
                            California, 5.8%, 2015
 250,000      AA-         California State Transportation Commis-        225,993
                            sion, San Francisco Bay Toll Bridge
                            Revenue, 4.6%, 2005
 250,000      A           California General Obligation, 6.5%, 2010      265,293
 100,000      AA-         East Bay Municipal Utility District             97,830
                            Revenue, 6.0%, 2020
 100,000      AA-         East Bay Regional Park District General         97,526
                            Obligation, 5.75%, 2012
 250,000      AA          Los Angeles County Sanitation District         228,510
                            Financing Authority Revenue, 5.375%, 2013
 100,000      AAA         Los Angeles County Transportation               98,253
                            Commission Revenue, MBIA Insured, 6.0%,
                            2023
 100,000      AA          Los Angeles Department of Water and Power       96,671
                            Revenue, 6.0%, 2032
 250,000      AA          Los Angeles General Obligation, 5.25%, 2008    234,625
 250,000      AAA         M-S-R Public Power Agency, San Juan Revenue    254,375
                            Project, AMBAC Insured, 6.0%, 2008
 250,000      AA          Metropolitan Water District of Southern        229,630
                            California Revenue, 5.5%, 2019
 250,000      AAA         North Of The River Sanitation District #       226,635
                            1 Revenue, AMBAC Insured, 5.25%, 2017
 250,000      AAA         Northern California Power Agency Revenue,      230,200
                            Hydroelectric Project Number One, MBIA
                            Insured, 5.5%, 2023
 100,000      AAA         Northern California Transmission Revenue,       94,033
                            MBIA Insured, 5.5%, 2014
 250,000      AA          Orange County Local Transportation             252,770
                            Authority, Sales Tax Revenue, 6.0%, 2008
 100,000      A1(1)       Palm Springs Unified School District            88,974
                            General Obligation, 5.3%, 2017
 250,000      AA+         Palo Alto Utility Revenue, 6.2%, 2012          259,150
 250,000      AA-         Pasadena Electric Revenue, 5.15%, 2001         252,400
 250,000      A-          Sacramento Municipal Utility District          233,438
                            Electric Revenue, 5.75%, 2022
 250,000      AA+         San Diego Open Space Park Facility General     251,270
                            Obligation, 5.75%, 2008
 250,000      A-          San Diego Public Facilities Financing          215,675
                            Authority Sewer Revenue, 5.25%, 2020
 100,000      AAA         San Francisco Sewer Revenue, AMBAC Insured,     93,921
                            5.5%, 2015
 250,000      AAA         San Jose Airport Revenue, F.G.I.C. Insured,    254,598
                            5.875%, 2007
 100,000      AAA         San Luis Obispo Water Revenue, MBIA Insured,     93,067
                            5.5%, 2018
 250,000      AAA         Santa Barbara County Transportation            225,958
                            Authority, Sales Tax Revenue, FGIC
                            Insured, 5.0%, 2010
 200,000      AA-         Santa Monica-Malibu Unified School             183,290
                            District General Obligation, 5.5%, 2018
 250,000      AAA         Santa Monica Wastewater Enterprise             234,053
                            Revenue, AMBAC Insured, 5.0%, 2008
 100,000      A+          South Coast Water District Revenue, 5.875%,     88,182
                            2021
 250,000      AA-         Southern California Public Power Authority     236,095
                            Transmission Project Revenue, 5.75%, 2021
                                                                      $6,076,464
                          PUERTO RICO -- 8.6%
$100,000      A           Commonwealth of Puerto Rico General         $    97,117
                            Obligation, 6.0%, 2022
 250,000      A-          Puerto Rico Electric Power Authority           247,755
                            Revenue, 6.0%, 2010
 250,000      A+          Puerto Rico Telephone Authority Revenue,       244,566
                            5.4%, 2008
                                                                      $   589,438
                             TOTAL INVESTMENT IN TAX-EXEMPT           $6,665,902
                               SECURITIES -- 97.1%
                               (Total Cost $6,905,519)(a)


                          TEMPORARY INVESTMENT IN SECURITIES -- 2.9%
                          TAX-EXEMPT VARIABLE RATE SECURITIES(2)
$100,000                  California Pollution Control Financing      $  100,312
                            Authority, Shell Oil Guarantee, 3.5%, 2000
 100,000                  Los Angeles County Museum of Arts, Bank of     100,360
                            America Guarantee, 4.25%, 2005
                             TOTAL INVESTMENT IN TEMPORARY            $   200,672
                               TAX-EXEMPT VARIABLE RATE
                               SECURITIES -- 2.9%
                               (Total Cost $200,000)
                             TOTAL INVESTMENT IN SECURITIES -- 100%   $6,866,574
                               (Total Cost $7,105,519)
</TABLE>
    

 + The concentration of investments in securities by type of obligation/
   market sector is:

<TABLE>
     <S>                                                                   <C>
     General Obligation                                                    15.9%
     Insured                                                               26.0%
     Revenue Bonds:
        Education Revenue                                                   3.5%
        Electric, Water & Sewer Revenue                                    22.5%
        Power Revenue                                                      14.0%
        Transportation Revenue                                              3.3%
        Sales Revenue                                                       3.6%
        Various Revenues                                                    7.1%
     Reserves                                                               4.1%
</TABLE>

(1) Rating by Moody's.

(2) Rate for variable rate security is as of March 31, 1995.

   
(a) At March 31, 1995 the net unrealized depreciation on investments based
    on cost for federal income tax purposes of $6,905,519 was as follows:

<TABLE>
     <S>                                                             <C>
     Aggregate gross unrealized appreciation for
       all investments in which there is an excess
       of value over tax cost                                        $   33,611
     Aggregate gross unrealized depreciation for
       all investments in which there is an excess
       of tax cost over value                                          (273,228)
     Net unrealized depreciation                                      $(239,617)
</TABLE>
    

   Purchases and sales of investments securities (excluding temporary cash
   investments) for the six months ended March 31, 1995, aggregated
   $1,254,588 and $818,003, respectively.

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

PIONEER CALIFORNIA DOUBLE TAX-FREE FUND
BALANCE SHEET (UNAUDITED) -- MARCH 31, 1995

   
<TABLE>
<S>                                                                  <C>
ASSETS:
   Investments in securities, at value (including
     temporary cash investments of $200,672)
     (identified cost $7,105,519; see Schedule of
     Investments and Note 1)                                         $6,866,574
   Cash                                                                  84,048
   Receivables --
     Interest                                                           106,534
     Trust shares sold                                                   13,935
   Due from Pioneering Management Corporation (Note
     2)                                                                  28,763
   Other                                                                  1,074
       Total assets                                                  $7,100,928
LIABILITIES:
   Dividends payable                                                    $11,843
   Accrued expenses (Notes 2, 3, and 4)                                  32,217
       Total liabilities                                                $44,060
NET ASSETS:
   Trust shares (unlimited number of shares
     authorized), amount paid in on 663,797 shares
     outstanding
     (Notes 1 and 5)                                                 $7,392,149
   Accumulated net realized loss on investments                         (95,664)
   Net unrealized loss on investments                                  (239,617)
       Total net assets (equivalent to $10.63 per
        share based on 663,797 trust shares
        outstanding)                                                 $7,056,868
</TABLE>
    

PIONEER CALIFORNIA DOUBLE TAX-FREE FUND
STATEMENT OF OPERATIONS (UNAUDITED)
FOR THE SIX MONTHS ENDED MARCH 31, 1995

   
<TABLE>
<S>                                                    <C>             <C>
INVESTMENT INCOME (NOTE 1):
   Interest                                                            $188,844
EXPENSES:
   Management fees (Note 2)                            $18,706
   Transfer fees (Note 3)                                1,666
   Distribution fees (Note 4)                            6,306
   Registration fees                                     2,730
   Custodian fees                                        3,640
   Professional fees                                    11,191
   Accounting (Note 2)                                  22,420
   Printing                                              1,644
   Fees and expenses of nonaffiliated trustees           1,820
   Regulatory reporting                                  3,960
   Miscellaneous expenses                                3,458
       Total expenses                                  $77,541
   Less management fees waived and expenses
     reimbursed by Pioneering Management
     Corporation (Note 2)                               61,952
   Net expenses                                                        $ 15,589
       Net investment income                                           $173,255
REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS:
   Net realized loss on investments                                    $(74,130)
   Decrease in net unrealized loss on investments                       342,210
       Net gain on investments                                         $268,080
          Net increase in net assets resulting from
           operations                                                 $ 441,335
</TABLE>
    

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

PIONEER CALIFORNIA DOUBLE TAX-FREE FUND
STATEMENTS OF CHANGES IN NET ASSETS
FOR THE SIX MONTHS ENDED MARCH 31, 1995 AND THE YEAR ENDED SEPTEMBER 30,
1994

<TABLE>
<CAPTION>
                                                                                   SIX MONTHS
                                                                                      ENDED          YEAR
                                                                                    MARCH 31,        ENDED
                                                                                      1995       SEPTEMBER 30,
                                                                                   (UNAUDITED)       1994
<S>                                             <C>                 <C>            <C>            <C>
FROM OPERATIONS:
   Net investment income                                                           $    173,255   $   292,847
   Net realized loss on investments                                                    (74,130)      (21,534)
   Increase (decrease) in net unrealized gain on investments                           342,210      (728,382)
       Net increase (decrease) in net assets resulting from operations             $    441,335   $  (457,069)
DISTRIBUTIONS TO SHAREHOLDERS:
   From net investment income ($0.28 and $0.59 per share, respectively)            $   (173,255)  $  (292,847)
   In excess of net investment income ($0.00 and $0.00 per share, respectively)        --               (450)
       Decrease in net assets resulting from distributions to shareholders         $  (173,255)   $  (293,297)
FROM TRUST SHARE TRANSACTIONS (NOTE 1):                   SHARES
   Net proceeds from sale of shares             154,437             301,171        $  1,553,266   $ 3,349,296
   Net asset value of shares issued to
     shareholders in reinvestment of
     dividends                                   10,789              17,790            109,063       192,405
   Cost of shares repurchased                  (106,747)            (58,823)        (1,062,336)     (625,136)
       Increase in net assets resulting from
        trust share transactions                 58,479             260,138        $    599,993   $ 2,916,565
        Net increase in net assets                                                 $    868,073   $ 2,166,199
NET ASSETS:
   Beginning of period                                                               6,188,795     4,022,596
   End of period                                                                   $  7,056,868   $ 6,188,795
</TABLE>

PIONEER CALIFORNIA DOUBLE TAX-FREE FUND
FINANCIAL HIGHLIGHTS
SELECTED DATA FOR A SHARE OUTSTANDING

<TABLE>
<CAPTION>
                                           SIX MONTHS
                                             ENDED           YEAR        FEBRUARY 19,
                                           MARCH 31,        ENDED           1993 TO
                                              1995      SEPTEMBER 30,    SEPTEMBER 30,
                                          (UNAUDITED)        1994            1993
<S>                                       <C>             <C>             <C>
Net asset value, beginning of period       $     10.22    $     11.65     $     11.24 
Income from investment operations: 
   Net investment income                   $      0.28    $      0.59     $      0.38 
   Net realized and unrealized gain (loss) 
     on investments                              0.41          (1.43)           0.41 
       Total income (loss) from investment 
        operations                         $      0.69    $     (0.84)    $      0.79 
Distributions to shareholders from net 
  investment income                             (0.28)         (0.59)          (0.38) 
Net increase (decrease) in net asset value $      0.41    $     (1.43)    $      0.41 
Net asset value, end of period             $     10.63    $     10.22     $     11.65 
Total return*                                    6.92%         (7.45)%          7.14% 
Ratio of net operating expenses to average 
  net assets                                     0.50%**        0.36%           0.00%** 
Ratio of net investment income to average 
  net assets                                     5.56%**        5.31%           5.37%** 
Portfolio turnover rate                         26.61%**       10.82%           0.00% 
Net assets, end of period                  $ 7,056,868    $ 6,188,795     $ 4,022,596 
Ratios assuming no waiver of management fees 
  or assumption of expenses: 
   Net operating expenses                        2.49%**        2.69%           4.15%** 
   Net investment income                         3.57%**        2.98%           1.22%** 
<FN>
 * Assumes initial investment at net asset value at the beginning of each 
   period, reinvestment of all dividends and distributions, the complete 
   redemption of the investment at net asset value at the end of each pe- 
   riod, and no sales charges. Total return would be reduced if sales 
   charges were taken into account. 

** Annualized. 
</FN>
</TABLE>

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

SCHEDULE OF INVESTMENTS -- PIONEER NEW YORK TRIPLE TAX-FREE FUND -- MARCH 
31, 1995 (UNAUDITED) 

   
<TABLE>
<CAPTION>
              STANDARD 
PRINCIPAL     & POOR'S 
 AMOUNT        RATING                   INVESTMENTS+                    VALUE 
<S>           <C>         <C>                                         <C>
                          TAX-EXEMPT SECURITIES -- 100% 
                          NEW YORK -- 90.8% 
$200,000      AAA         Albany General Obligation, AMBAC Insured,   $  206,756 
                            6.125%, 2009 
 100,000      AAA         Buffalo School General Obligation, MBIA         96,621 
                            Insured, 5.05%, 2007 
 125,000      AAA         Buffalo Sewer Authority Revenue, FGIC          119,694 
                            Insured, 5.25%, 2008 
 100,000      Aa1(1)      Dutchess County General Obligation, 5.25%,      94,131 
                            2010 
 150,000      AAA         Fairport Central School District General       146,717 
                            Obligation, FGIC Insured, 5.0%, 2006 
 100,000      AAA         Huntington General Obligation, FGIC             96,136 
                            Insured, 5.5%, 2013 
 100,000      AAA         Metropolitan Transportation Authority           99,432 
                            Revenue, FGIC Insured, 5.5%, 2008 
 100,000      AAA         Monroe County General Obligation, MBIA          99,436 
                            Insured, 5.5%, 2008 
 125,000      A           Municipal Assistance Corporation For New       116,927 
                            York City Revenue, 5.0%, 2008 
 100,000      AAA         Nassau County General Obligation, FGIC         108,085 
                            Insured, 6.6%, 2011 
  75,000      AAA         Nassau County Combined Sewer Districts          71,960 
                            General Obligation, MBIA Insured, 5.4%, 
                            2011 
  30,000      A-          New York City Municipal Water Finance           32,601 
                            Authority Water And Sewer System Revenue, 
                            6.375%, Prerefunded, 2002* 
 100,000      A-          New York State General Obligation, 5.3%,        88,051 
                            2019 
 100,000      A-          New York State General Obligation, 5.7%,       100,813 
                            2006 
 100,000      AA          New York State Dormitory Authority Revenue      97,807 
                            Cornell University, 5.1%, 2005 
 175,000      AA+         New York State Dormitory Authority Revenue     161,597 
                            Columbia University, 4.7%, 2007 
 100,000      AAA         New York State Dormitory Authority Revenue      99,897 
                            Fordham University, FGIC Insured, 5.6%, 
                            2008 
 200,000      A+          New York State Dormitory Authority Revenue     205,078 
                            University of Rochester, 6.0%, 2007 
 125,000      AAA         New York State Environmental Facilities        119,057 
                            Corporation Water Pollution Control 
                            Revenue, 
                            5.6%, 2013 
 100,000      A           New York State Local Government Assistance      98,845 
                            Corporation Revenue, 6.00%, 2012 
 100,000      A           New York State Local Government Assistance     100,067 
                            Corporation Revenue, 6.25%, 2018 
 125,000      Aa(1)       New York State Mortgage Agency Revenue,        109,419 
                            5.25%, 2015 
 125,000      Aa(1)       New York State Mortgage Agency Revenue,        126,469 
                            6.5%, 2017 
 100,000      AA-         New York State Power Authority Revenue,        100,723 
                            6.25%, 2023 
 100,000      AA-         New York State Power Authority Revenue,        106,981 
                            6.5%, 2008 
 150,000      A           New York State Thruway Authority Revenue,      143,261 
                            5.75%, 2019 
 100,000      AAA         North Hempstead General Obligation, AMBAC      101,744 
                            Insured, 5.5%, 2004 
 100,000      Aa(1)       Orange County General Obligation, 5.3%,         98,175 
                            2007 
 150,000      AA          Onondaga County General Obligation, 5.85%,     151,698 
                            2011 
  50,000      AA-         Port Authority of New York and New Jersey       45,125 
                            Revenue, 5.125%, 2012 
 100,000      AA-         Port Authority of New York and New Jersey       89,106 
                            Revenue, 5.2%, 2019 
 100,000      Aa(1)       Sands Point General Obligation, 6.4%, 2008     106,167 
  75,000      AAA         Suffolk County Water Authority Revenue,         75,590 
                            AMBAC Insured, 5.25%, Prerefunded, 2004* 
 100,000      A1(1)       Tarrytown General Obligation, 5.0%, 2009        91,578 
 200,000      A+          Triborough Bridge and Tunnel Authority         197,980 
                            Revenue, 6.0%, 2014 
 200,000      A(1)        United Nations Development Corporation         197,334 
                            Revenue, 6.0%, 2012 
                                                                      $4,101,058 
                          PUERTO RICO -- 9.2% 
$100,000      A           Commonwealth of Puerto Rico General         $   97,117 
                            Obligation, 6.0%, 2022 
 150,000      A-          Puerto Rico Electric Power Authority           148,653 
                            Revenue, 6.0%, 2010 
 175,000      A+          Puerto Rico Telephone Authority Revenue,       171,199 
                            5.4%, 2008 
                                                                      $   416,969 
                             TOTAL INVESTMENT IN TAX-EXEMPT           $4,518,027 
                               SECURITIES -- 100% (Total Cost 
                               $4,558,347)(a) 
</TABLE>
    

 + The concentration of investments in securities by type of obligation/ 
   market sector is: 

<TABLE>
     <S>                                                                   <C>    
     General Obligation                                                    17.8% 
     Escrowed in U.S. Government Securities                                 2.3% 
     Insured                                                               26.8% 
     Revenue Bonds: 
        Education Revenue                                                  10.0% 
        Housing Revenue                                                     5.1% 
        Pollution Control Revenue                                           2.6% 
        Power Revenue                                                       7.7% 
        Sales Tax Revenue                                                   6.8% 
        Transportation Revenue                                             10.1% 
        Various Revenues                                                    7.9% 
     Reserves                                                               2.9% 
</TABLE>

  * Prerefunded bonds have been collateralized by U.S. Treasury securities 
    that are held in escrow and used to pay principal and interest on the 
    tax-exempt issue and to retire the bonds in full at the earliest re- 
    funding date. 

(1) Rating by Moody's. 

   
(a) At March 31, 1995 the net unrealized depreciation on investments based 
    on cost for federal income tax purposes of $4,558,347 was as follows: 

<TABLE>
     <S>                                                               <C>
     Aggregate gross unrealized appreciation for 
       all investments in which there is an excess 
       of value over tax cost                                          $ 54,333 
     Aggregate gross unrealized depreciation for 
       all investments in which there is an excess 
       of tax cost over value                                           (94,653) 
     Net unrealized depreciation                                       $(40,320) 
</TABLE>
    

   Purchases and sales of investments securities (excluding temporary cash 
   investments) for the six months ended March 31, 1995, aggregated 
   $1,017,066 and $683,365, respectively. 

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

PIONEER NEW YORK TRIPLE TAX-FREE FUND 
BALANCE SHEET (UNAUDITED) -- MARCH 31, 1995 

<TABLE>
<S>                                                                  <C>
ASSETS: 
   Investments in securities, at value (identified 
     cost $4,558,347; see Schedule of Investments 
     and Note 1)                                                     $4,518,027 
   Cash                                                                 132,599 
   Interest Receivable                                                   84,062 
   Due from Pioneering Management Corporation (Note 
     2)                                                                  35,074 
   Other                                                                  1,277 
       Total assets                                                  $4,771,039 
LIABILITIES: 
   Dividends Payable                                                    $ 5,031 
   Accrued expenses (Notes 2, 3, and 4)                                  38,038 
       Total liabilities                                             $   43,069 
NET ASSETS: 
   Trust shares (unlimited number of shares 
     authorized), amount paid in on 440,678 shares 
     outstanding 
     (Notes 1 and 5)                                                 $4,828,568 
   Accumulated net realized loss on investments                         (60,278) 
   Net unrealized loss on investments                                   (40,320) 
       Total net assets (equivalent to $10.73 per 
        share based on 440,678 trust shares 
        outstanding)                                                 $4,727,970 
</TABLE>

PIONEER NEW YORK TRIPLE TAX-FREE FUND 
STATEMENT OF OPERATIONS (UNAUDITED) 
FOR THE SIX MONTHS ENDED MARCH 31, 1995 

   
<TABLE>
<S>                                                 <C>                 <C>
INVESTMENT INCOME (NOTE 1): 
   Interest                                                             $128,311 
EXPENSES: 
   Management fees (Note 2)                         $13,079 
   Transfer fees (Note 3)                               908 
   Distribution fees (Note 4)                           745 
   Registration fees                                  3,240 
   Custodian fees                                     1,550 
   Professional fees                                 16,571 
   Accounting (Note 2)                               23,716 
   Printing                                           2,184 
   Fees and expenses of nonaffiliated 
     trustees                                         1,820 
   Regulatory reporting                               3,910 
   Miscellaneous expenses                             3,458 
       Total expenses                               $ 71,181 
   Less management fees waived and expenses 
     reimbursed by Pioneering Management 
     Corporation (Note 2)                            60,281 
   Net expenses                                                         $  10,900 
       Net investment income                                            $ 117,411 
REALIZED AND UNREALIZED (GAIN) LOSS ON 
  INVESTMENTS: 
   Net realized loss on investments                                     $ (58,388) 
   Decrease in net unrealized loss on 
     investments                                                         230,676 
       Net gain on investments                                          $ 172,288 
          Net increase in net assets 
           resulting from operations                                    $ 289,699 
</TABLE>
    

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

PIONEER NEW YORK TRIPLE TAX-FREE FUND 
STATEMENTS OF CHANGES IN NET ASSETS 
FOR THE SIX MONTHS ENDED MARCH 31, 1995 AND THE YEAR ENDED SEPTEMBER 30, 
1994 

<TABLE>
<CAPTION>
                                                                                   SIX MONTHS 
                                                                                      ENDED          YEAR 
                                                                                    MARCH 31,        ENDED 
                                                                                      1995       SEPTEMBER 30, 
                                                                                   (UNAUDITED)       1994 
<S>                                            <C>                  <C>            <C>            <C>
FROM OPERATIONS: 
   Net investment income                                                           $    117,411   $   188,795 
   Net realized loss on investments                                                    (58,388)       (1,890) 
   Increase (decrease) in net unrealized gain on investments                           230,676      (392,984) 
       Net (increase) decrease in net assets resulting from operations             $    289,699   $  (206,079) 
DISTRIBUTIONS TO SHAREHOLDERS: 
   From net investment income ($0.27 and $0.57 per share, respectively)            $   (117,411)  $  (188,795) 
   In excess of net investment income ($0.00 and $0.00 per share, respectively)        --               (145) 
       Decrease in net assets resulting from distributions to shareholders            (117,411)     (188,940) 
                                                          SHARES 
FROM TRUST SHARE TRANSACTIONS (NOTE 1): 
   Net proceeds from sale of shares             255,096             156,372        $  2,602,084   $ 1,722,320 
   Net asset value of shares issued to 
     shareholders in reinvestment of 
     dividends                                    8,670              14,245             89,043       155,363 
   Cost of shares repurchased                  (223,838)            (30,748)        (2,299,691)     (337,697) 
       Increase in net assets resulting from 
        trust share transactions                 39,928             139,869        $    391,436   $ 1,539,986 
          Net increase in net assets                                               $    563,724   $ 1,144,967 
NET ASSETS: 
   Beginning of period                                                               4,164,246     3,019,279 
   End of period                                                                   $  4,727,970   $ 4,164,246 
</TABLE>

PIONEER NEW YORK TRIPLE TAX-FREE FUND 
FINANCIAL HIGHLIGHTS 
SELECTED DATA FOR A SHARE OUTSTANDING 

<TABLE>
<CAPTION>
                                           SIX MONTHS 
                                             ENDED           YEAR        FEBRUARY 19, 
                                           MARCH 31,        ENDED           1993 TO 
                                              1995      SEPTEMBER 30,    SEPTEMBER 30, 
                                          (UNAUDITED)        1994            1993 
<S>                                       <C>             <C>             <C>
Net asset value, beginning of period       $     10.39    $     11.57     $     11.18 
Income from investment operations: 
   Net investment income                   $      0.27    $      0.57     $      0.37 
   Net realized and unrealized gain (loss) 
     on investments                              0.34          (1.18)           0.39 
       Total income (loss) from investment 
        operations                         $      0.61    $     (0.61)    $      0.76 
Distributions to shareholders from net 
  investment income                             (0.27)         (0.57)          (0.37) 
Net increase (decrease) net asset value    $      0.34    $     (1.18)    $      0.39 
Net asset value, end of period             $     10.73    $     10.39     $     11.57 
Total return*                                    6.07%         (5.45)%          6.91% 
Ratio of net operating expenses to average 
  net assets                                     0.50%**        0.36%           0.00% 
Ratio of net investment income to average 
  net assets                                     5.39%**        5.15%           5.19%** 
Porfolio turnover rate                          32.13%**        1.96%           0.00%** 
Net assets, end of period                  $ 4,727,970    $ 4,164,246     $ 3,019,279 
Ratios assuming no waiver of management fees 
  or assumption of expenses: 
   Net operating expenses                        3.26%**        3.51%           5.05%** 
   Net investment income                         2.62%**        2.00%           0.14%** 
<FN>
 * Assumes initial investment at net asset value at the beginning of the 
   period, reinvestment of all dividends and distributions, the complete 
   redemption of the investment at net asset value at the end of each pe- 
   riod, and no sales charges. Total return would be reduced if sales 
   charges were taken into account. 

** Annualized. 
</FN>
</TABLE>

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

SCHEDULE OF INVESTMENTS -- PIONEER MASSACHUSETTS DOUBLE TAX-FREE FUND -- 
MARCH 31, 1995 (UNAUDITED) 

   
<TABLE>
<CAPTION>
              STANDARD 
PRINCIPAL     & POOR'S 
 AMOUNT        RATING                    INVESTMENTS+                    VALUE 
<S>           <C>          <C>                                           <C>
                           TAX-EXEMPT SECURITIES -- 100% 
                           MASSACHUSETTS -- 86.7% 
$100,000       AAA         Attleboro General Obligation, AMBAC 
                             Insured, 5.3%, 2003                        $100,255 
 100,000       AAA         Boston General Obligation, AMBAC Insured, 
                             5.55%, 2008                                  99,537 
 120,000       AAA         Boston Industrial Development Financing 
                             Authority Revenue, ConnieLee Insured, 
                             5.25%, 2014                                 108,080 
 100,000       Aa1(1)      Brookline General Obligation, 5.6%, 2012       97,820 
 125,000       Aaa(1)      Concord Electric Improvement General 
                             Obligation, 5.0%, 2012                      113,780 
 125,000       AAA         Dighton & Rehoboth Regional School District 
                             General Obligation, AMBAC Insured, 5.4%, 
                             2009                                        121,268 
 125,000       Aa(1)       Hingham General Obligation, 5.1%, 2006        123,094 
 125,000       A+          Commonwealth of Massachusetts General 
                             Obligation, 6.0%, 2012                      124,190 
  50,000       A+          Massachusetts Bay Transportation Author- 
                             ity Revenue, 5.2%, 2003                      49,487 
 100,000       A+          Massachusetts Bay Transportation Author- 
                             ity Revenue, 6.1%, 2013                     102,186 
 175,000       A+          Massachusetts Convention Center Authority 
                             Revenue, Boston Common Parking Garage, 
                             5.375%, 2013                                162,528 
 100,000       A+          Massachusetts Health and Educational 
                             Facilities Authority Revenue, Boston 
                             College, 
                             5.125%, 2008                                 94,187 
 100,000       AAA         Massachusetts Health and Educational 
                             Facilities Authority Revenue, Harvard 
                             University, 5.5%, 2015                       95,479 
 100,000       AA+         Massachusetts Health and Educational 
                             Facilities Authority Revenue, Massachu- 
                             setts Institute of Technology, 5.0%, 2011     91,448 
 100,000       AA+         Massachusetts Health and Educational 
                             Facilities Authority Revenue, Massachu- 
                             setts Institute of Technology, 5.0%, 2023     85,977 
 150,000       A(1)        Massachusetts Health and Educational 
                             Facilities Authority Revenue, Wheaton 
                             College, 5.125%, 2009                       139,226 
 100,000       AA          Massachusetts Health and Educational 
                             Facilities Authority Revenue, Williams 
                             College, 
                             5.5%, 2017                                   93,195 
 100,000       AAA         Massachusetts Housing Finance Agency 
                             Residential Development, FNMA Collat- 
                             eralized, 6.25%, 2014                       100,492 
 125,000       A(1)        Massachusetts Industrial Financial Agency 
                             Revenue, Brooks School, 5.95%, 2023         121,005 
 100,000       A+          Massachusetts Industrial Financial Agency 
                             Revenue, Holy Cross College, 6.375%, 2015    101,785 
 100,000       AA          Massachusetts Industrial Financial Agency 
                             Revenue, Phillips Academy, 5.375%, 2023      89,522 
 100,000       AAA         Massachusetts Municipal Wholesale Elec- 
                             tric Company Revenue, AMBAC Insured, 
                             5.1%, 2007                                   93,746 
 150,000       AA-         Massachusetts Port Authority Revenue, 
                             6.0%, 2013                                  148,833 
 150,000       AA          Massachusetts State Special Obligation 
                             Revenue, 6.0%, 2013                         148,349 
 125,000       A+          Massachusetts Turnpike Authority Revenue, 
                             5.0%, 2013                                  111,073 
 125,000       A           Massachusetts Water Resources Authority 
                             Revenue, 6.25%, 2010                        127,609 
 125,000       AAA         Monson General Obligation, MBIA Insured, 
                             5.3%, 2006                                  124,144 
 100,000       AAA         Quaboag Regional School District, General 
                             Obligation, MBIA Insured, 5.3%, 2008         96,764 
 100,000       AAA         Sandwich General Obligation, AMBAC 
                             Insured, 5.2%, 2005                          97,925 
 100,000       AAA         South Essex Sewer District, General 
                             Obligation, MBIA Insured, 6.5%, 2006        107,386 
  75,000       Aaa(1)      Weston General Obligation, 5.8%, 2012          75,015 
                                                                      $3,345,385 
                           PUERTO RICO -- 13.3% 
$125,000       A           Commonwealth of Puerto Rico General        $ 
                             Obligation, 6.0%, 2022                      121,396 
 125,000       A-          Puerto Rico Electric Power Authority 
                             Revenue, 6.0%, 2010                         123,878 
 100,000       A           Puerto Rico Highway Authority Revenue, 
                             6.0%, 2020                                   96,710 
 175,000       A+          Puerto Rico Telephone Authority Revenue, 
                             5.4%, 2008                                  171,196 
                                                                      $  513,180 
                               TOTAL INVESTMENT IN TAX-EXEMPT 
                                SECURITIES -- 100% (Total Cost 
                                $3,951,610)(a)                        $3,858,565 

</TABLE>
    

 + The concentration of investments in securities by type of obligation/ 
   market sector is: 

<TABLE>
     <S>                                                                   <C>
     General Obligation                                                    16.6% 
     Insured                                                               24.0% 
     Revenue Bonds: 
        Transportation Revenue                                             12.8% 
        Power Revenue                                                       3.2% 
        Housing Revenue                                                     2.5% 
        Education Revenue                                                  23.0% 
        Electric, Water & Sewer Revenue                                     3.2% 
        Sales Tax Revenue                                                   3.8% 
        Various Revenues                                                    8.4% 
     Reserves                                                               2.5% 
</TABLE>

(1) Rating by Moody's. 

   
(a) At March 31, 1995 the net unrealized depreciation on investments based 
    on cost for federal income tax purposes of $3,951,610 was as follows: 

<TABLE>
     <S>                                                              <C>
     Aggregate gross unrealized appreciation for 
       all investments in which there is an excess 
       of value over tax cost                                         $  20,319 
     Aggregate gross unrealized depreciation for 
       all investments in which there is an excess 
       of tax cost over value                                          (113,364) 
     Net unrealized depreciation                                      $ (93,045) 
</TABLE>
    

   Purchases and sales of investments securities (excluding temporary cash 
   investments) for the six months ended March 31, 1995, aggregated 
   $246,239 and $204,652, respectively. 

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

PIONEER MASSACHUSETTS DOUBLE TAX-FREE FUND 
BALANCE SHEET (UNAUDITED) -- MARCH 31, 1995 

<TABLE>
<S>                                                                   <C>
ASSETS: 
   Investments in securities, at value (identified 
     cost $3,951,610; see Schedule of Investments 
     and Note 1)                                                      $3,858,565 
   Cash                                                                   99,078 
   Receivables -- 
     Interest                                                             61,341 
     Trust shares sold                                                       250 
   Due from Pioneering Management Corporation (Note 
     2)                                                                   21,136 
   Other                                                                   1,267 
       Total assets                                                   $ 4,041,637 
LIABILITIES: 
   Payables -- 
     Trust shares repurchased                                         $   49,028 
     Dividends                                                             1,456 
   Accrued expenses (Notes 2, 3 and 4)                                    23,882 
       Total liabilities                                              $    74,366 
NET ASSETS: 
   Trust shares (unlimited number of shares 
     authorized), amount paid in on 369,022 shares 
     outstanding (Notes 1 and 5)                                      $ 4,111,168 
   Accumulated net realized loss on investments                          (50,852) 
   Net unrealized loss on investments                                    (93,045) 
       Total net assets (equivalent to $10.75 per 
        share based on 369,022 trust shares 
        outstanding)                                                  $ 3,967,271 
</TABLE>

PIONEER MASSACHUSETTS DOUBLE TAX-FREE FUND 
STATEMENT OF OPERATIONS (UNAUDITED) 
FOR THE SIX MONTHS ENDED MARCH 31, 1995 

   
<TABLE>
<S>                                                     <C>             <C>
INVESTMENT INCOME (NOTE 1): 
   Interest                                                             $110,340 
EXPENSES: 
   Management fees (Note 2)                             $ 11,108 
   Transfer fees (Note 3)                                 1,294 
   Distribution fees (Note 4)                               651 
   Registration fees                                      1,410 
   Custodian fees                                         3,348 
   Professional fees                                      8,346 
   Accounting (Note 2)                                   20,804 
   Printing                                               1,320 
   Fees and expenses of nonaffiliated trustees            1,820 
   Regulatory reporting                                   3,633 
   Miscellaneous expenses                                 3,458 
     Total expenses                                     $ 57,192 
   Less management fees waived and expenses 
     reimbursed Pioneering Management Corporation 
     (Note 2)                                            47,936 
   Net expenses                                                         $   9,256 
     Net investment income                                              $ 101,084 
REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS: 
   Net realized loss on investments                                     $ (43,436) 
   Decrease in net unrealized loss on investments                        211,212 
       Net gain on investments                                          $ 167,776 
       Net increase in net assets resulting from 
        operations                                                      $ 268,860 
</TABLE>
    

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

PIONEER MASSACHUSETTS DOUBLE TAX-FREE FUND 
STATEMENTS OF CHANGES IN NET ASSETS 
FOR THE SIX MONTHS ENDED MARCH 31, 1995 AND FOR THE YEAR ENDED SEPTEMBER 
30, 1994 

   
<TABLE>
<CAPTION>
                                                                                   SIX MONTHS 
                                                                                      ENDED          YEAR 
                                                                                    MARCH 31,        ENDED 
                                                                                      1995       SEPTEMBER 30, 
                                                                                   (UNAUDITED)       1994 
<S>                                                   <C>            <C>           <C>            <C>
FROM OPERATIONS: 
   Net investment income                                                           $   101,084    $    189,812 
   Net realized loss on investments                                                   (43,436)         (7,416) 
   Increase (decrease) in net unrealized gain on investments                          211,212        (435,876) 
     Net increase (decrease) in net assets resulting from operations               $   268,860    $   (253,480) 
DISTRIBUTIONS TO SHAREHOLDERS: 
   From net investment income ($0.28 and $0.58 per share, respectively)            $  (101,084)   $   (189,812) 
   In excess of net investment income ($0.00 and $0.00 per share, respectively)        --                (882) 
                                                                                     (101,084)       (190,694) 
FROM TRUST SHARE TRANSACTIONS (NOTE 1):                       SHARES 
   Net proceeds from sale of shares                    12,907         282,933      $   134,308    $  3,194,734 
   Net asset value of shares issued to shareholders 
     in reinvestment of dividends                       9,171          15,911          93,862         172,985 
   Cost of shares repurchased                         (19,961)       (206,237)       (202,586)     (2,325,810) 
     Increase in net assets resulting from trust 
       share transactions                               2,117          92,607      $    25,584    $  1,041,909 
       Net increase in net assets                                                  $  193,360     $   597,735 
NET ASSETS: 
   Beginning of period                                                              3,773,911       3,176,176 
   End of period                                                                   $ 3,967,271    $  3,773,911 
</TABLE>
    

PIONEER MASSACHUSETTS DOUBLE TAX-FREE FUND 
FINANCIAL HIGHLIGHTS 
SELECTED DATA FOR A SHARE OUTSTANDING 

<TABLE>
<CAPTION>
                                           SIX MONTHS 
                                             ENDED         FOR THE       FEBRUARY 19, 
                                           MARCH 31,      YEAR ENDED        1993 TO 
                                              1995      SEPTEMBER 30,    SEPTEMBER 30, 
                                          (UNAUDITED)        1994            1993 
<S>                                       <C>             <C>             <C>
Net asset value, beginning of period       $     10.29    $     11.58     $     11.12 
Income from investment operations: 
   Net investment income                   $      0.28    $      0.58     $      0.37 
   Net unrealized gain (loss) on 
     investments                                 0.46          (1.29)           0.46 
       Total income (loss) from investment 
        operations                         $      0.74    $     (0.71)    $      0.83 
Distributions to shareholders from net 
  investment income                             (0.28)         (0.58)          (0.37) 
Net increase (decrease) in net asset value $      0.46    $     (1.29)    $      0.46 
Net asset value, end of period             $     10.75    $     10.29     $     11.58 
Total return*                                    7.33%         (6.33)%          7.58% 
Ratio of net operating expenses to average 
  net assets                                     0.50%**        0.35%           0.00%** 
Ratio of net investment income to average 
  net assets                                     5.46%**        5.23%           5.22%** 
Porfolio turnover rate                          11.27%**        2.65%           0.00% 
Net assets, end of period                  $ 3,967,271    $ 3,773,911     $ 3,176,176 
Ratios assuming no waiver of management fees 
  or assumption of expenses: 
   Net operating expenses                        3.09%**        3.45%           4.89%** 
   Net investment income                         2.87%**        2.13%           0.33%** 
<FN>
 * Assumes initial investment at net asset value at the beginning of the 
   period, reinvestment of all dividends and distributions, the complete 
   redemption of the investment at net asset value at the end of each pe- 
   riod, and no sales charges. Total return would be reduced if sales 
   charges were taken into account. 

** Annualized. 
</FN>
</TABLE>

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

NOTES TO FINANCIAL STATEMENTS -- MARCH 31, 1995 (UNAUDITED) 

1. Pioneer Tax-Free State Series Trust (the Trust) is a Massachusetts 
business trust, registered under the Investment Company Act of 1940 as a 
diversified, open- ended management company. The Trust consists of three 
separate funds (the Funds): Pioneer California Double Tax-Free Fund (Cali- 
fornia Fund), Pioneer New York Triple Tax-Free Fund (New York Fund) and 
Pioneer Massachusetts Double Tax-Free Fund (Massachusetts Fund). As of 
March 31, 1995, The Pioneer Group, Inc. (PGI) was the beneficial owner of 
approximately 19%, 41% and 54% of the outstanding shares of the California 
Fund, New York Fund and Massachusetts Fund, respectively. The following is 
a summary of significant accounting policies consistently followed by the 
Funds, which are in conformity with those generally accepted in the in- 
vestment company industry. 

A. Investment Securities -- Security transactions are recorded on the 
date the securities are purchased or sold. Investments in securities are 
valued on the basis of valuations furnished by an independent pricing ser- 
vice which utilizes a matrix system. This matrix system reflects such fac- 
tors as security prices, yields, maturities and ratings, and is supple- 
mented by dealer and exchange quotations. Market discount is accreted 
daily on a straight line basis. Original issue discount is accreted daily 
on a yield to maturity basis. Temporary cash investments are valued at 
cost plus accrued interest, which approximates market value. Interest in- 
come is recorded on the accrual basis. 

Gains and losses from sales of investments are calculated on the "identi- 
fied cost" method for both financial reporting and federal income tax pur- 
poses. It is the Funds' practice first to 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 Funds' policy to comply with the require- 
ments of the Internal Revenue Code applicable to regulated investment com- 
panies and to distribute all of their taxable income and net realized cap- 
ital gains, if any, to their shareholders. Therefore, no federal tax pro- 
visions are required. 
    

The characterization of distributions to shareholders for financial re- 
porting purposes is determined in accordance with income tax rules. There- 
fore, the source of a portfolio's distributions may be shown in the accom- 
panying financial statements as either from or in excess of net in- vest- 
ment income or net realized gain on investment transactions, or from 
capital, depending on the type of book/tax differences that may exist. 

   
At March 31, 1995, the Funds had capital loss carryforward of approxi- 
mately: 
    

    California Fund                                            $21,534 
    New York Fund                                                1,890 
    Massachusetts Fund                                           7,416 

   
C. Trust Shares -- The Funds record sales and repurchases of their trust 
shares on the trade date. Net losses, if any, as a result of cancella- 
tions, are absorbed by Pioneer Funds Distributor, Inc. (PFD), the princi- 
pal underwriter for the Funds and a wholly owned subsidiary of PGI. For 
sales made during the six months ended March 31, 1995, PFD earned under- 
writing commissions of: 
    

    California Fund                                             $2,836 
    New York Fund                                                1,391 
    Massachusetts Fund                                             119 

Dividends are declared daily and are normally paid on the last business 
day of each month. 

   
2. Pioneering Management Corporation (PMC), the Trust's investment ad- 
viser, manages the Funds' portfolios and is a wholly owned subsidiary of 
PGI. Management fees are calculated at the annual rate of 0.60% of each of 
the Funds' average daily net assets. 
    

From February 19, 1993 to January 31, 1994, PMC absorbed 100% of each of 
the Funds' expenses. Effective from February 1, 1994, PMC has waived its 
management fees and, if necessary, will limit or otherwise reduce other 
operating expenses (excluding interest and taxes) to the extent needed to 
limit the Funds' expenses according to the following schedule: 

<TABLE>
<CAPTION>
                                                              EXPENSES LIMITED 
                                                                BY PMC AS A 
                                                               PERCENTAGE OF 
        AVERAGE DAILY NET ASSETS                            AVERAGE DAILY ASSETS 
<S>                                                         <C>
Up to $20 million                                                 To 0.50% 
Up to $25 million                                                 To 0.55% 
Up to $30 million                                                 To 0.60% 
Up to $35 million                                                 To 0.65% 
Up to $40 million                                                 To 0.70% 
Over $40 million                                                  To 0.75% 
</TABLE>

PMC's agreement to waive its management fees and assume the Funds' ex- 
penses is voluntary and temporary and may be revised or terminated at any 
time. 

   
In addition, under the management agreement, certain services and costs, 
including accounting, regulatory reporting and insurance premiums, are to 
be paid by the Funds. Included in Accrued expenses are accounting fees 
payable to PMC at March 31, 1995 of: 
    

    California Fund                                             $4,129 
    New York Fund                                                5,838 
    Massachusetts Fund                                           2,257 

3. Pioneering Services Corporation (PSC), a wholly owned subsidiary of 
PGI, provides substantially all transfer agent and shareholder services to 
the Funds at negotiated rates. Included in Accrued expenses -- Other are 
transfer fees payable to PSC at March 31, 1995 of: 

    California Fund                                             $  932 
    New York Fund                                                  780 
    Massachusetts Fund                                           2,289 

   
4. The Trust has adopted, effective January 1, 1994, a Plan of Distribu- 
tion (the Plan) in accordance with Rule 12b-1 pursuant to the Investment 
Company Act of 1940. The Plan generally provides that each Fund will reim- 
burse PFD for PFD's actual expenditures to finance activities intended to 
result in the sale of Fund shares or to provide services to the Funds' 
shareholders. Expenditures of each Fund pursuant to the Plan may not ex- 
ceed 0.25% of theFund's average annual net assets. In addition, effective 
January 1, 1994, a service fee of 0.15% of each Fund's daily net assets 
will be accrued daily and paid quarterly pursuant to the Plan. Included in 
Accrued expenses are distribution fees payable to PFD at March 31, 1995 
of: 
    

    California Fund                                            $10,104 
    New York Fund                                                3,854 
    Massachusetts Fund                                           3,919 

5. The Trust has adopted the provisions of Statement of Position 93-2 
(SOP 93-2) "Determination, Disclosure, and Financial Statement Presenta- 
tion of Income, Capital Gain, and Return of Capital Distributions of In- 
vestment Companies." SOP 93-2 requires the Funds to report the accumulated 
net investment income (loss) and accumulated net capital gain (loss) ac- 
counts to approximate amounts available for future distributions on a tax 
basis (or to offset future realized capital gains). As a result, on Sep- 
tember 30, 1994 the Funds reclassified the following amounts from distri- 
butions in excess of net investment income to paid-in capital (trust 
shares): 

    California Fund                                               $450 
    New York Fund                                                  145 
    Massachusetts Fund                                             882 

   
These reclassifications have no impact on the net asset values of the 
Funds and are designed to present the Funds' capital accounts on a tax 
basis. 
    

PIONEER CALIFORNIA 
DOUBLE TAX-FREE FUND 

PIONEER NEW YORK 
TRIPLE TAX-FREE FUND 

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

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 Funds, 
this report must be accompanied by an official prospectus that dis- 
cusses the objectives, policies, sales charges, and other information 
about the Funds. 
    

0595-2430 
(C)Pioneer Funds Distributor, Inc. 




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