<PAGE> PAGE 1
000 B000000 12/31/95
000 C000000 0000812195
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000 H000000 N
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000 J000000 A
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002 A000000 60 STATE STREET
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002 C000000 MA
002 D010000 02109
002 D020000 1820
003 000000 N
004 000000 N
005 000000 N
006 000000 N
007 A000000 Y
007 B000000 3
007 C010100 1
007 C020100 PIONEER CASH RESERVES FUND
007 C030100 N
007 C010200 2
007 C020200 PIONEER U.S.GOVERNMENT MONEY FUND
007 C030200 N
007 C010300 3
007 C020300 PIONEER TAX-FREE MONEY FUND
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007 C010400 4
007 C010500 5
007 C010600 6
007 C010700 7
007 C010800 8
007 C010900 9
007 C011000 10
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008 C00AA01 801-8255
008 D01AA01 BOSTON
008 D02AA01 MA
008 D03AA01 02109
008 D04AA01 1820
011 A00AA01 PIONEER FUNDS DISTRIBUTOR, INC.
011 B00AA01 8-41256
011 C01AA01 BOSTON
011 C02AA01 MA
011 C03AA01 02109
<PAGE> PAGE 2
011 C04AA01 1820
012 A00AA01 PIONEERING SERVICES CORPORATION
012 B00AA01 84-1359
012 C01AA01 BOSTON
012 C02AA01 MA
012 C03AA01 02109
012 C04AA01 1820
013 A00AA01 ARTHUR ANDERSEN LLP
013 B01AA01 BOSTON
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015 B00AA01 C
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015 A00AA02 NATIONAL AUSTRALIA BANK
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015 E04AA04 X
015 A00AA05 DEN DANSKE BANK, COPENHAGEN
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<PAGE> PAGE 3
015 D02AA07 75001
015 E04AA07 X
015 A00AA08 MORGAN GUARANTY TRUST CO. OF NEW YORK
015 B00AA08 S
015 C01AA08 FRANKFURT D-6000
015 D01AA08 GERMANY
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015 A00AA09 CHASE MANHATTAN BANK, N.A.
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015 D01AA10 ITALY
015 D02AA10 20121
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015 D01AA11 JAPAN
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<PAGE> PAGE 4
015 D01AA16 NORWAY
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<PAGE> PAGE 5
015 D01AA25 UNITED KINGDOM
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<PAGE> PAGE 6
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<PAGE> PAGE 7
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054 D00AA00 N
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<PAGE> PAGE 8
077 F000000 N
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<PAGE> PAGE 9
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<PAGE> PAGE 10
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070 E010100 N
070 E020100 N
070 F010100 N
070 F020100 N
070 G010100 N
070 G020100 N
070 H010100 N
070 H020100 N
070 I010100 N
070 I020100 N
070 J010100 N
070 J020100 N
070 K010100 N
070 K020100 N
070 L010100 N
070 L020100 N
070 M010100 N
070 M020100 N
070 N010100 N
070 N020100 N
070 O010100 Y
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<PAGE> PAGE 11
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<PAGE> PAGE 12
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<PAGE> PAGE 13
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<PAGE> PAGE 14
070 J020200 N
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<PAGE> PAGE 15
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<PAGE> PAGE 16
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<PAGE> PAGE 17
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<PAGE> PAGE 18
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<PAGE> PAGE 19
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SIGNATURE WILLIAM H. KEOUGH
TITLE TREASURER
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000812195
<NAME> PIONEER MONEY MARKET TRUST
<SERIES>
<NUMBER> 011
<NAME> PIONEER CASH RESERVES CLASS A
<S> <C>
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
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WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
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To the Board of Trustees of
Pioneer Money Market Trust:
In planning and performing our audit of the financial statements of Pioneer
Money Market Trust (consisting of the Pioneer Cash Reserves Fund, the Pioneer
U.S. Government Money Fund and the Pioneer Tax-Free Money Fund ) for the year
ended December 31, 1995, we considered its internal control structure, including
procedures for safeguarding securities, in order to determine our auditing
procedures for the purpose of expressing our opinion on the financial statements
and to comply with the requirements of Form N-SAR, not to provide assurance on
the internal control structure.
The management of Pioneer Money Market Trust is responsible for establishing and
maintaining an internal control structure. In fulfilling this responsibility,
estimates and judgments by management are required to assess the expected
benefits and related costs of internal control structure policies and
procedures. Two of the objectives of an internal control structure are to
provide management with reasonable, but not absolute, assurance that assets are
safeguarded against loss from unauthorized use or disposition and transactions
are executed in accordance with management's authorization and recorded properly
to permit preparation of financial statements in conformity with generally
accepted accounting principles.
Because of inherent limitations in any internal control structure, errors or
irregularities may occur and may not be detected. Also, projection of any
evaluation of the structure to future periods is subject to the risk that it may
become inadequate because of changes in conditions or that the effectiveness of
the design and operation may deteriorate.
Our consideration of the internal control structure would not necessarily
disclose all matters in the internal control structure that might be material
weaknesses under standards established by the American Institute of Certified
Public Accountants. A material weakness is a condition in which the design or
operation of the specific internal control structure elements does not reduce to
a relatively low level the risk that errors or irregularities in amounts that
would be material in relation to the financial statements being audited may
occur and not be detected within a timely period by employees in the normal
course of performing their assigned functions. However, we noted no matters
involving the internal control structure, including procedures for safeguarding
securities, that we consider to be material weaknesses, as defined above, as of
December 31, 1995.
This report is intended solely for the information and use of management and the
Securities and Exchange Commission.
/s/ Arthur Andersen LLP
ARTHUR ANDERSEN LLP
Boston, Massachusetts
February 2, 1996
