<PAGE> PAGE 1
000 B000000 08/31/99
000 C000000 0000205007
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0.a
000 J000000 U
001 A000000 SHORT TERM INVESTMENT TRUST
001 B000000 811-2729
001 C000000 7136261919
002 A000000 11 GREENWAY PLAZA STE 100
002 B000000 HOUSTON
002 C000000 TX
002 D010000 77046
003 000000 N
004 000000 N
005 000000 N
006 000000 N
007 A000000 Y
007 B000000 3
007 C010200 2
007 C020200 TREASURY PORTFOLIO
007 C030200 N
007 C010700 7
007 C020700 TREASURY TAX ADVANTAGE PORTFOLIO
007 C030700 N
007 C010800 8
007 C020800 GOVERNMENT AND AGENCY PORTFOLIO
007 C030800 N
008 A00AA01 AIM ADVISORS INC
008 B00AA01 A
008 C00AA01 801-12313
008 D01AA01 HOUSTON
008 D02AA01 TX
008 D03AA01 77046
011 A00AA01 FUND MANAGEMENT COMPANY
011 B00AA01 8-41848
011 C01AA01 HOUSTON
011 C02AA01 TX
011 C03AA01 77046
012 A00AA01 AIM FUND SERVICES INC
012 B00AA01 84-5432
012 C01AA01 HOUSTON
012 C02AA01 TX
012 C03AA01 77046
012 C04AA01 1173
013 A00AA01 KPMG PEAT MARWICK LLP
013 B01AA01 HOUSTON
013 B02AA01 TX
<PAGE> PAGE 2
013 B03AA01 77002
015 A00AA01 THE BANK OF NEW YORK
015 B00AA01 C
015 C01AA01 NEW YORK
015 C02AA01 NY
015 C03AA01 10286
015 E01AA01 X
018 00AA00 Y
019 A00AA00 Y
019 B00AA00 98
019 C00AA00 AIMFUNDSAA
021 000000 0
022 A000001 WARBURG DILLON REED, LLC
022 B000001 13-3340045
022 C000001 88656402
022 D000001 352815
022 A000002 SALOMON SMITH BARNEY, INC.
022 B000002 11-2418191
022 C000002 74431933
022 D000002 43038
022 A000003 BARCLAYS CAPITAL INC.
022 B000003 13-3551367
022 C000003 64263335
022 D000003 707254
022 A000004 SOCIETE GERNERAL SECURITIES CO.
022 B000004 13-1976032
022 C000004 59325999
022 D000004 0
022 A000005 GREENWICH CAPITAL MARKETS INC.
022 B000005 06-1415808
022 C000005 54002781
022 D000005 0
022 A000006 CREDIT SUISSE FIRST BOSTON CORP
022 B000006 13-5659485
022 C000006 42689012
022 D000006 87357
022 A000007 CIBC OPPENHEIMER CORP
022 B000007 13-2798343
022 C000007 40725585
022 D000007 0
022 A000008 FIRST CHICAGO CAPITAL MARKETS, INC.
022 B000008 36-3595942
022 C000008 39442868
022 D000008 0
022 A000009 MERRILL LYNCH, PIERCE, FENNER, & SMITH INC.
022 B000009 13-5674085
022 C000009 36033781
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022 A000010 MORGAN STANLEY & CO. INC.
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<PAGE> PAGE 3
022 D000010 0
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026 A000000 N
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026 E000000 N
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026 G020000 N
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054 E00AA00 N
054 F00AA00 N
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084 A00AA00 N
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085 A00AA00 N
085 B00AA00 N
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025 B000201 13-3551367
025 C000201 D
025 D000201 225000
025 A000202 CREDIT SUISSE FIRST BOSTON CORP.
025 B000202 13-5659485
025 C000202 D
<PAGE> PAGE 4
025 D000202 200000
025 A000203 MERRILL LYNCH, PIERCE,FENNER, & SMITH INC.
025 B000203 13-5674085
025 C000203 D
025 D000203 225000
025 A000204 SALOMON SMITH BARNEY INC.
025 B000204 11-2418191
025 C000204 D
025 D000204 750000
025 A000205 SOCIETE GENERAL SECURITIES CO.
025 B000205 13-1976032
025 C000205 D
025 D000205 500000
025 A000206 WARBURG DILLION READ LLC
025 B000206 13-3873456
025 C000206 D
025 D000206 322630
025 A000207 CIBC OPPENHEIMER CORP.
025 B000207 13-2798343
025 C000207 D
025 D000207 225000
025 D000208 0
028 A010200 3202909
028 A020200 6783
028 A030200 0
028 A040200 3530653
028 B010200 2327285
028 B020200 7595
028 B030200 0
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028 C020200 6593
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028 D010200 2054906
028 D020200 6823
028 D030200 0
028 D040200 2176271
028 E010200 2312564
028 E020200 6109
028 E030200 0
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028 F010200 2481713
028 F020200 6358
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<PAGE> PAGE 5
029 000200 N
030 A000200 0
030 B000200 0.00
030 C000200 0.00
031 A000200 0
031 B000200 0
032 000200 0
033 000200 0
034 000200 N
035 000200 0
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037 000200 N
038 000200 0
039 000200 N
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041 000200 Y
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042 D000200 0
042 E000200 0
042 F000200 0
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042 H000200 0
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048 D020200 0.000
048 E010200 0
048 E020200 0.000
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048 F020200 0.000
048 G010200 0
048 G020200 0.000
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048 J020200 0.000
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<PAGE> PAGE 6
048 K020200 0.050
049 000200 N
050 000200 N
051 000200 N
052 000200 N
053 A000200 Y
053 B000200 Y
053 C000200 N
055 A000200 N
055 B000200 N
056 000200 N
057 000200 N
058 A000200 N
059 000200 Y
060 A000200 Y
060 B000200 Y
061 000200 1000
062 A000200 Y
062 B000200 18.0
062 C000200 0.0
062 D000200 82.1
062 E000200 0.0
062 F000200 0.0
062 G000200 0.0
062 H000200 0.0
062 I000200 0.0
062 J000200 0.0
062 K000200 0.0
062 L000200 0.0
062 M000200 0.0
062 N000200 0.0
062 O000200 0.0
062 P000200 0.0
062 Q000200 0.0
062 R000200 0.0
063 A000200 20
063 B000200 0.0
064 A000200 N
066 A000200 N
067 000200 N
068 A000200 N
068 B000200 N
069 000200 N
070 A010200 Y
070 A020200 Y
070 B010200 N
070 B020200 N
070 C010200 N
070 C020200 N
070 D010200 N
070 D020200 N
<PAGE> PAGE 7
070 E010200 N
070 E020200 N
070 F010200 N
070 F020200 N
070 G010200 N
070 G020200 N
070 H010200 N
070 H020200 N
070 I010200 N
070 I020200 N
070 J010200 Y
070 J020200 N
070 K010200 Y
070 K020200 N
070 L010200 N
070 L020200 N
070 M010200 N
070 M020200 N
070 N010200 Y
070 N020200 N
070 O010200 Y
070 O020200 N
070 P010200 Y
070 P020200 N
070 Q010200 N
070 Q020200 N
070 R010200 N
070 R020200 N
071 A000200 0
071 B000200 0
071 C000200 0
071 D000200 0
072 A000200 12
072 B000200 261703
072 C000200 0
072 D000200 0
072 E000200 0
072 F000200 3072
072 G000200 0
072 H000200 0
072 I000200 594
072 J000200 197
072 K000200 0
072 L000200 32
072 M000200 52
072 N000200 0
072 O000200 0
072 P000200 0
072 Q000200 179
072 R000200 8
072 S000200 65
<PAGE> PAGE 8
072 T000200 6590
072 U000200 0
072 V000200 0
072 W000200 396
072 X000200 11185
072 Y000200 2048
072 Z000200 252566
072AA000200 233
072BB000200 0
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072CC020200 0
072DD010200 154879
072DD020200 97687
072EE000200 700
073 A010200 0.0000
073 A020200 0.0000
073 B000200 0.0001
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074 A000200 0
074 B000200 4272630
074 C000200 938245
074 D000200 0
074 E000200 0
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074 L000200 13668
074 M000200 274
074 N000200 5224817
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074 P000200 682
074 Q000200 0
074 R010200 0
074 R020200 0
074 R030200 0
074 R040200 20388
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075 A000200 5304632
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<PAGE> PAGE 9
024 000700 N
028 A010700 129936
028 A020700 119
028 A030700 0
028 A040700 104091
028 B010700 141656
028 B020700 130
028 B030700 0
028 B040700 153867
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028 C030700 0
028 C040700 122965
028 D010700 59237
028 D020700 185
028 D030700 0
028 D040700 88548
028 E010700 74725
028 E020700 193
028 E030700 0
028 E040700 71896
028 F010700 95001
028 F020700 183
028 F030700 0
028 F040700 100326
028 G010700 651005
028 G020700 919
028 G030700 0
028 G040700 641693
028 H000700 0
029 000700 N
030 A000700 0
030 B000700 0.00
030 C000700 0.00
031 A000700 0
031 B000700 0
032 000700 0
033 000700 0
034 000700 N
035 000700 0
036 B000700 0
037 000700 N
038 000700 0
039 000700 N
040 000700 Y
041 000700 Y
042 A000700 0
042 B000700 0
042 C000700 100
042 D000700 0
042 E000700 0
<PAGE> PAGE 10
042 F000700 0
042 G000700 0
042 H000700 0
043 000700 125
044 000700 0
045 000700 Y
046 000700 N
047 000700 Y
048 000700 0.000
048 A010700 250000
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048 B010700 250000
048 B020700 0.150
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048 D020700 0.000
048 E010700 0
048 E020700 0.000
048 F010700 0
048 F020700 0.000
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048 G020700 0.000
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048 H020700 0.000
048 I010700 0
048 I020700 0.000
048 J010700 0
048 J020700 0.000
048 K010700 500000
048 K020700 0.100
049 000700 N
050 000700 N
051 000700 N
052 000700 N
053 A000700 Y
053 B000700 Y
053 C000700 N
055 A000700 N
055 B000700 N
056 000700 N
057 000700 N
058 A000700 N
059 000700 Y
060 A000700 Y
060 B000700 Y
061 000700 1000
062 A000700 Y
062 B000700 98.6
062 C000700 0.0
062 D000700 0.0
<PAGE> PAGE 11
062 E000700 0.0
062 F000700 0.0
062 G000700 0.0
062 H000700 0.0
062 I000700 0.0
062 J000700 0.0
062 K000700 0.0
062 L000700 0.0
062 M000700 0.0
062 N000700 0.0
062 O000700 0.0
062 P000700 0.0
062 Q000700 0.0
062 R000700 0.0
063 A000700 44
063 B000700 0.0
064 A000700 N
064 B000700 N
066 A000700 N
067 000700 N
068 A000700 N
068 B000700 N
069 000700 N
070 A010700 Y
070 A020700 N
070 B010700 N
070 B020700 N
070 C010700 N
070 C020700 N
070 D010700 N
070 D020700 N
070 E010700 N
070 E020700 N
070 F010700 N
070 F020700 N
070 G010700 N
070 G020700 N
070 H010700 N
070 H020700 N
070 I010700 N
070 I020700 N
070 J010700 Y
070 J020700 N
070 K010700 Y
070 K020700 N
070 L010700 N
070 L020700 N
070 M010700 N
070 M020700 N
070 N010700 Y
070 N020700 N
<PAGE> PAGE 12
070 O010700 Y
070 O020700 N
070 P010700 Y
070 P020700 N
070 Q010700 N
070 Q020700 N
070 R010700 N
070 R020700 N
071 A000700 0
071 B000700 0
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072 B000700 6803
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<PAGE> PAGE 13
074 C000700 131991
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075 A000700 147495
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076 000700 0.00
024 000800 Y
025 A000801 BARCLAYS CAPITAL INC.
025 B000801 13-3551367
025 C000801 D
025 D000801 12000
025 A000802 CREDIT SUISSE FIRST BOSTON CORP.
025 B000802 13-5659485
025 C000802 D
025 D000802 12000
025 A000803 GREENWICH CAPITAL MARKETS INC.
025 B000803 06-1415808
025 C000803 D
025 D000803 45000
025 A000804 SALOMON SMITH BARNEY INC.
025 B000804 11-2418191
025 C000804 D
025 D000804 12000
025 A000805 WARBURG DILLON READ LLC
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025 C000805 D
<PAGE> PAGE 14
025 D000805 25000
025 A000806 MORGAN STANLEY & CO. INC.
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<PAGE> PAGE 15
041 000800 Y
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050 000800 N
051 000800 N
052 000800 N
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055 A000800 N
055 B000800 N
056 000800 N
057 000800 N
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<PAGE> PAGE 16
060 B000800 Y
061 000800 1000
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062 B000800 0.0
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062 O000800 0.0
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062 R000800 0.0
063 A000800 27
063 B000800 0.0
064 A000800 N
066 A000800 N
067 000800 N
068 A000800 N
068 B000800 N
069 000800 N
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070 B020800 N
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070 C020800 N
070 D010800 N
070 D020800 N
070 E010800 N
070 E020800 N
070 F010800 N
070 F020800 N
070 G010800 N
070 G020800 N
070 H010800 N
070 H020800 N
070 I010800 N
070 I020800 N
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<PAGE> PAGE 17
070 L020800 N
070 M010800 N
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070 N020800 N
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071 A000800 0
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<PAGE> PAGE 18
073 A020800 0.0000
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SIGNATURE DANA SUTTON
TITLE VP AND TREASURER
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information from the STIT
Government & Agency Fund Institutional Shares September 30,1999 annual
report.
</LEGEND>
<CIK> 0000205007
<NAME> SHORT TERM INVESTMENT TRUST
<SERIES>
<NUMBER> 8
<NAME> GOVERNMENT AND AGENCY PORTFOLIO INSTITUTIONAL SHARES
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<GROSS-ADVISORY-FEES> 232220
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 754995
<AVERAGE-NET-ASSETS> 112709406
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> 0.05
<PER-SHARE-GAIN-APPREC> 0.00
<PER-SHARE-DIVIDEND> (0.05)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 1.00
<EXPENSE-RATIO> 0.06
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information from the STIT
Government & Agency Fund Private Shares September 30,1999 annual
report.
</LEGEND>
<CIK> 0000205007
<NAME> SHORT TERM INVESTMENT TRUST
<SERIES>
<NUMBER> 8
<NAME> GOVERNMENT AND AGENCY PORTFOLIO PRIVATE SHARES
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> 8-31-1999
<PERIOD-END> 8-31-1999
<INVESTMENTS-AT-COST> 280265778
<INVESTMENTS-AT-VALUE> 280265778
<RECEIVABLES> 29437
<ASSETS-OTHER> 25635
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 280320850
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1135738
<TOTAL-LIABILITIES> 1135738
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 279185112
<SHARES-COMMON-STOCK> 279185112
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
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<ACCUMULATED-NET-GAINS> 0
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 279185112
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 11543223
<OTHER-INCOME> 0
<EXPENSES-NET> (327812)
<NET-INVESTMENT-INCOME> 11215411
<REALIZED-GAINS-CURRENT> 0
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 11215411
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (11215411)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1147325075
<NUMBER-OF-SHARES-REDEEMED> (875929538)
<SHARES-REINVESTED> 7789575
<NET-CHANGE-IN-ASSETS> 279185112
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 232220
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 754995
<AVERAGE-NET-ASSETS> 41176813
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> 0.05
<PER-SHARE-GAIN-APPREC> 0.00
<PER-SHARE-DIVIDEND> (0.05)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 1.00
<EXPENSE-RATIO> 0.36
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information from the STIT
Government & Agency Fund Personal Shares September 30,1999 annual
report.
</LEGEND>
<CIK> 0000205007
<NAME> SHORT TERM INVESTMENT TRUST
<SERIES>
<NUMBER> 8
<NAME> GOVERNMENT AND AGENCY PORTFOLIO PERSONAL SHARES
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> 8-31-1999
<PERIOD-END> 8-31-1999
<INVESTMENTS-AT-COST> 280265778
<INVESTMENTS-AT-VALUE> 280265778
<RECEIVABLES> 29437
<ASSETS-OTHER> 25635
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 280320850
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1135738
<TOTAL-LIABILITIES> 1135738
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 279185112
<SHARES-COMMON-STOCK> 279185112
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 0
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 279185112
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 11543223
<OTHER-INCOME> 0
<EXPENSES-NET> (327812)
<NET-INVESTMENT-INCOME> 11215411
<REALIZED-GAINS-CURRENT> 0
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 11215411
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (11215411)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1147325075
<NUMBER-OF-SHARES-REDEEMED> (875929538)
<SHARES-REINVESTED> 7789575
<NET-CHANGE-IN-ASSETS> 279185112
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 232220
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 754995
<AVERAGE-NET-ASSETS> 0
<PER-SHARE-NAV-BEGIN> 0.00
<PER-SHARE-NII> 0.00
<PER-SHARE-GAIN-APPREC> 0.00
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 0.00
<EXPENSE-RATIO> 0.00
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information from the STIT
Government & Agency Fund Cash Management Shares September 30,1999
annual report.
</LEGEND>
<CIK> 0000205007
<NAME> SHORT TERM INVESTMENT TRUST
<SERIES>
<NUMBER> 8
<NAME> GOVERNMENT AND AGENCY PORTFOLIO CASH MANAGEMENT SHARES
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> 8-31-1999
<PERIOD-END> 8-31-1999
<INVESTMENTS-AT-COST> 280265778
<INVESTMENTS-AT-VALUE> 280265778
<RECEIVABLES> 29437
<ASSETS-OTHER> 25635
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 280320850
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1135738
<TOTAL-LIABILITIES> 1135738
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 279185112
<SHARES-COMMON-STOCK> 279185112
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 0
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 279185112
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 11543223
<OTHER-INCOME> 0
<EXPENSES-NET> (327812)
<NET-INVESTMENT-INCOME> 11215411
<REALIZED-GAINS-CURRENT> 0
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 11215411
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (11215411)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1147325075
<NUMBER-OF-SHARES-REDEEMED> (875929538)
<SHARES-REINVESTED> 7789575
<NET-CHANGE-IN-ASSETS> 279185112
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 232220
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 754995
<AVERAGE-NET-ASSETS> 66659653
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> 0.05
<PER-SHARE-GAIN-APPREC> 0.00
<PER-SHARE-DIVIDEND> (0.05)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 1.00
<EXPENSE-RATIO> 0.14
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information from the STIT
Government & Agency Fund Resource Shares September 30,1999
annual report.
</LEGEND>
<CIK> 0000205007
<NAME> SHORT TERM INVESTMENT TRUST
<SERIES>
<NUMBER> 8
<NAME> GOVERNMENT AND AGENCY PORTFOLIO RESOURCE SHARES
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> 8-31-1999
<PERIOD-END> 8-31-1999
<INVESTMENTS-AT-COST> 280265778
<INVESTMENTS-AT-VALUE> 280265778
<RECEIVABLES> 29437
<ASSETS-OTHER> 25635
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 280320850
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1135738
<TOTAL-LIABILITIES> 1135738
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 279185112
<SHARES-COMMON-STOCK> 279185112
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 0
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 279185112
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 11543223
<OTHER-INCOME> 0
<EXPENSES-NET> (327812)
<NET-INVESTMENT-INCOME> 11215411
<REALIZED-GAINS-CURRENT> 0
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 11215411
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (11215411)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1147325075
<NUMBER-OF-SHARES-REDEEMED> (875929538)
<SHARES-REINVESTED> 7789575
<NET-CHANGE-IN-ASSETS> 279185112
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 232220
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 754995
<AVERAGE-NET-ASSETS> 11674044
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> 0.05
<PER-SHARE-GAIN-APPREC> 0.00
<PER-SHARE-DIVIDEND> (0.05)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 1.00
<EXPENSE-RATIO> 0.21
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information from the STIT
Government & Agency Fund Reserve Shares September 30,1999
annual report.
</LEGEND>
<CIK> 0000205007
<NAME> SHORT TERM INVESTMENT TRUST
<SERIES>
<NUMBER> 8
<NAME> GOVERNMENT AND AGENCY PORTFOLIO RESERVE SHARES
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> 8-31-1999
<PERIOD-END> 8-31-1999
<INVESTMENTS-AT-COST> 280265778
<INVESTMENTS-AT-VALUE> 280265778
<RECEIVABLES> 29437
<ASSETS-OTHER> 25635
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 280320850
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1135738
<TOTAL-LIABILITIES> 1135738
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 279185112
<SHARES-COMMON-STOCK> 279185112
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 0
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 279185112
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 11543223
<OTHER-INCOME> 0
<EXPENSES-NET> (327812)
<NET-INVESTMENT-INCOME> 11215411
<REALIZED-GAINS-CURRENT> 0
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 11215411
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (11215411)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1147325075
<NUMBER-OF-SHARES-REDEEMED> (875929538)
<SHARES-REINVESTED> 7789575
<NET-CHANGE-IN-ASSETS> 279185112
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 232220
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 754995
<AVERAGE-NET-ASSETS> 0
<PER-SHARE-NAV-BEGIN> 0.00
<PER-SHARE-NII> 0.00
<PER-SHARE-GAIN-APPREC> 0.00
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 0.00
<EXPENSE-RATIO> 0.00
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information from the Short Term
Investment Trust Treasury Portfolio Institutional Shares August 31, 1999
Annual Report.
</LEGEND>
<CIK> 0000205007
<NAME> SHORT TERM INVESTMENT TRUST
<SERIES>
<NUMBER> 8
<NAME> TREASURY PORTFOLIO INSTITUTIONAL SHARES
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> AUG-31-1999
<PERIOD-END> AUG-31-1999
<INVESTMENTS-AT-COST> 5210875353
<INVESTMENTS-AT-VALUE> 5210875353
<RECEIVABLES> 13668357
<ASSETS-OTHER> 273732
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 5224817442
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 21070336
<TOTAL-LIABILITIES> 21070336
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 5203390987
<SHARES-COMMON-STOCK> 5203390987
<SHARES-COMMON-PRIOR> 5143411553
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 356119
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 5203747106
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 261703046
<OTHER-INCOME> 0
<EXPENSES-NET> (9136585)
<NET-INVESTMENT-INCOME> 252566461
<REALIZED-GAINS-CURRENT> 233481
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 252799942
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (252566461)
<DISTRIBUTIONS-OF-GAINS> (699973)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 33583085680
<NUMBER-OF-SHARES-REDEEMED> (33614890739)
<SHARES-REINVESTED> 91784493
<NET-CHANGE-IN-ASSETS> 59512942
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 822611
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 3072316
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 11184674
<AVERAGE-NET-ASSETS> 3197910489
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> 0.05
<PER-SHARE-GAIN-APPREC> 0.00
<PER-SHARE-DIVIDEND> (0.05)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 1.00
<EXPENSE-RATIO> 0.09
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information from the Short Term
Investment Trust Treasury Portfolio Private Shares August 31, 1999
Annual Report.
</LEGEND>
<CIK> 0000205007
<NAME> SHORT TERM INVESTMENT TRUST
<SERIES>
<NUMBER> 8
<NAME> TREASURY PORTFOLIO PRIVATE SHARES
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> AUG-31-1999
<PERIOD-END> AUG-31-1999
<INVESTMENTS-AT-COST> 5210875353
<INVESTMENTS-AT-VALUE> 5210875353
<RECEIVABLES> 13668357
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<TOTAL-ASSETS> 5224817442
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<TOTAL-LIABILITIES> 21070336
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 5203390987
<SHARES-COMMON-STOCK> 5203390987
<SHARES-COMMON-PRIOR> 5143411553
<ACCUMULATED-NII-CURRENT> 0
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<ACCUMULATED-NET-GAINS> 356119
<OVERDISTRIBUTION-GAINS> 0
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<NET-ASSETS> 5203747106
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<REALIZED-GAINS-CURRENT> 233481
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<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (252566461)
<DISTRIBUTIONS-OF-GAINS> (699973)
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<NUMBER-OF-SHARES-SOLD> 33583085680
<NUMBER-OF-SHARES-REDEEMED> (33614890739)
<SHARES-REINVESTED> 91784493
<NET-CHANGE-IN-ASSETS> 59512942
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 822611
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 3072316
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 11184674
<AVERAGE-NET-ASSETS> 354442723
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> 0.05
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<PER-SHARE-DIVIDEND> (0.05)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 1.00
<EXPENSE-RATIO> 0.39
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information from the Short Term
Investment Trust Treasury Portfolio Personal Shares August 31, 1999
Annual Report.
</LEGEND>
<CIK> 0000205007
<NAME> SHORT TERM INVESTMENT TRUST
<SERIES>
<NUMBER> 8
<NAME> TREASURY PORTFOLIO PERSONAL SHARES
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> AUG-31-1999
<PERIOD-END> AUG-31-1999
<INVESTMENTS-AT-COST> 5210875353
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<RECEIVABLES> 13668357
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<TOTAL-LIABILITIES> 21070336
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 5203390987
<SHARES-COMMON-STOCK> 5203390987
<SHARES-COMMON-PRIOR> 5143411553
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 356119
<OVERDISTRIBUTION-GAINS> 0
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<NET-ASSETS> 5203747106
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<NUMBER-OF-SHARES-REDEEMED> (33614890739)
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<PER-SHARE-GAIN-APPREC> 0.00
<PER-SHARE-DIVIDEND> (0.04)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 1.00
<EXPENSE-RATIO> 0.59
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information from the Short Term
Investment Trust Treasury Portfolio Cash Management Shares
August 31, 1999 Annual Report.
</LEGEND>
<CIK> 0000205007
<NAME> SHORT TERM INVESTMENT TRUST
<SERIES>
<NUMBER> 8
<NAME> TREASURY PORTFOLIO CASH MANAGEMENT SHARES
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> AUG-31-1999
<PERIOD-END> AUG-31-1999
<INVESTMENTS-AT-COST> 5210875353
<INVESTMENTS-AT-VALUE> 5210875353
<RECEIVABLES> 13668357
<ASSETS-OTHER> 273732
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 5224817442
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 21070336
<TOTAL-LIABILITIES> 21070336
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 5203390987
<SHARES-COMMON-STOCK> 5203390987
<SHARES-COMMON-PRIOR> 5143411553
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 356119
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 5203747106
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 261703046
<OTHER-INCOME> 0
<EXPENSES-NET> (9136585)
<NET-INVESTMENT-INCOME> 252566461
<REALIZED-GAINS-CURRENT> 233481
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 252799942
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (252566461)
<DISTRIBUTIONS-OF-GAINS> (699973)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 33583085680
<NUMBER-OF-SHARES-REDEEMED> (33614890739)
<SHARES-REINVESTED> 91784493
<NET-CHANGE-IN-ASSETS> 59512942
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 822611
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 3072316
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 11184674
<AVERAGE-NET-ASSETS> 979097144
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> 0.05
<PER-SHARE-GAIN-APPREC> 0.00
<PER-SHARE-DIVIDEND> (0.05)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 1.00
<EXPENSE-RATIO> 0.17
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information from the Short Term
Investment Trust Treasury Portfolio Resource Shares
August 31, 1999 Annual Report.
</LEGEND>
<CIK> 0000205007
<NAME> SHORT TERM INVESTMENT TRUST
<SERIES>
<NUMBER> 8
<NAME> TREASURY PORTFOLIO RESOURCE SHARES
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> AUG-31-1999
<PERIOD-END> AUG-31-1999
<INVESTMENTS-AT-COST> 5210875353
<INVESTMENTS-AT-VALUE> 5210875353
<RECEIVABLES> 13668357
<ASSETS-OTHER> 273732
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 5224817442
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 21070336
<TOTAL-LIABILITIES> 21070336
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 5203390987
<SHARES-COMMON-STOCK> 5203390987
<SHARES-COMMON-PRIOR> 5143411553
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 356119
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 5203747106
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 261703046
<OTHER-INCOME> 0
<EXPENSES-NET> (9136585)
<NET-INVESTMENT-INCOME> 252566461
<REALIZED-GAINS-CURRENT> 233481
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 252799942
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (252566461)
<DISTRIBUTIONS-OF-GAINS> (699973)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 33583085680
<NUMBER-OF-SHARES-REDEEMED> (33614890739)
<SHARES-REINVESTED> 91784493
<NET-CHANGE-IN-ASSETS> 59512942
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 822611
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 3072316
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 11184674
<AVERAGE-NET-ASSETS> 369242180
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> 0.05
<PER-SHARE-GAIN-APPREC> 0.00
<PER-SHARE-DIVIDEND> (0.05)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 1.00
<EXPENSE-RATIO> 0.25
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information from the Short Term
Investment Trust Treasury Portfolio Reserve Shares
August 31, 1999 Annual Report.
</LEGEND>
<CIK> 0000205007
<NAME> SHORT TERM INVESTMENT TRUST
<SERIES>
<NUMBER> 8
<NAME> TREASURY PORTFOLIO RESERVE SHARES
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> AUG-31-1999
<PERIOD-END> AUG-31-1999
<INVESTMENTS-AT-COST> 5210875353
<INVESTMENTS-AT-VALUE> 5210875353
<RECEIVABLES> 13668357
<ASSETS-OTHER> 273732
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 5224817442
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 21070336
<TOTAL-LIABILITIES> 21070336
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 5203390987
<SHARES-COMMON-STOCK> 5203390987
<SHARES-COMMON-PRIOR> 5143411553
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 356119
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 5203747106
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 261703046
<OTHER-INCOME> 0
<EXPENSES-NET> (9136585)
<NET-INVESTMENT-INCOME> 252566461
<REALIZED-GAINS-CURRENT> 233481
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 252799942
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (252566461)
<DISTRIBUTIONS-OF-GAINS> (699973)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 33583085680
<NUMBER-OF-SHARES-REDEEMED> (33614890739)
<SHARES-REINVESTED> 91784493
<NET-CHANGE-IN-ASSETS> 59512942
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 822611
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 3072316
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 11184674
<AVERAGE-NET-ASSETS> 28324369
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> 0.03
<PER-SHARE-GAIN-APPREC> 0.00
<PER-SHARE-DIVIDEND> (0.03)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 1.00
<EXPENSE-RATIO> 0.89
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information from the Short Term
Investment Trust Tax Advantage Portfolio Institutional Shares
August 31,1999 Annual Report.
</LEGEND>
<CIK> 0000205007
<NAME> SHORT TERM INVESTMENT TRUST
<SERIES>
<NUMBER> 7
<NAME> TAX ADVANTAGE PORTFOLIO INSTITUTIONAL SHARES
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> AUG-31-1999
<PERIOD-END> AUG-31-1999
<INVESTMENTS-AT-COST> 131991375
<INVESTMENTS-AT-VALUE> 131991375
<RECEIVABLES> 1396912
<ASSETS-OTHER> 1144883
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 134533170
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 639880
<TOTAL-LIABILITIES> 639880
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 133861259
<SHARES-COMMON-STOCK> 133861259
<SHARES-COMMON-PRIOR> 144184331
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 32031
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 133893290
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 6803219
<OTHER-INCOME> 0
<EXPENSES-NET> 400404
<NET-INVESTMENT-INCOME> 6402815
<REALIZED-GAINS-CURRENT> (10840)
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 6391975
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (6402815)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1211792558
<NUMBER-OF-SHARES-REDEEMED> (1223792174)
<SHARES-REINVESTED> 1676544
<NET-CHANGE-IN-ASSETS> (10333912)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 42871
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 294990
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 769888
<AVERAGE-NET-ASSETS> 97343900
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> 0.04
<PER-SHARE-GAIN-APPREC> 0.00
<PER-SHARE-DIVIDEND> (0.04)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 1.00
<EXPENSE-RATIO> 0.19
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information from the Short Term
Investment Trust Tax Advantage Portfolio Private Shares
August 31,1999 Annual Report.
</LEGEND>
<CIK> 0000205007
<NAME> SHORT TERM INVESTMENT TRUST
<SERIES>
<NUMBER> 7
<NAME> TAX ADVANTAGE PORTFOLIO PRIVATE SHARES
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> AUG-31-1999
<PERIOD-END> AUG-31-1999
<INVESTMENTS-AT-COST> 131991375
<INVESTMENTS-AT-VALUE> 131991375
<RECEIVABLES> 1396912
<ASSETS-OTHER> 1144883
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 134533170
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 639880
<TOTAL-LIABILITIES> 639880
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 133861259
<SHARES-COMMON-STOCK> 133861259
<SHARES-COMMON-PRIOR> 144184331
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 32031
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 133893290
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 6803219
<OTHER-INCOME> 0
<EXPENSES-NET> 400404
<NET-INVESTMENT-INCOME> 6402815
<REALIZED-GAINS-CURRENT> (10840)
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 6391975
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (6402815)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1211792558
<NUMBER-OF-SHARES-REDEEMED> (1223792174)
<SHARES-REINVESTED> 1676544
<NET-CHANGE-IN-ASSETS> (10333912)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 42871
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 294990
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 769888
<AVERAGE-NET-ASSETS> 50120851
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> 0.04
<PER-SHARE-GAIN-APPREC> 0.00
<PER-SHARE-DIVIDEND> (0.04)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 1.00
<EXPENSE-RATIO> 0.43
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information from the Short Term
Investment Trust Tax Advantage Portfolio Personal Shares
August 31,1999 Annual Report.
</LEGEND>
<CIK> 0000205007
<NAME> SHORT TERM INVESTMENT TRUST
<SERIES>
<NUMBER> 7
<NAME> TAX ADVANTAGE PORTFOLIO PERSONAL SHARES
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> AUG-31-1999
<PERIOD-END> AUG-31-1999
<INVESTMENTS-AT-COST> 131991375
<INVESTMENTS-AT-VALUE> 131991375
<RECEIVABLES> 1396912
<ASSETS-OTHER> 1144883
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 134533170
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 639880
<TOTAL-LIABILITIES> 639880
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 133861259
<SHARES-COMMON-STOCK> 133861259
<SHARES-COMMON-PRIOR> 144184331
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 32031
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 133893290
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 6803219
<OTHER-INCOME> 0
<EXPENSES-NET> 400404
<NET-INVESTMENT-INCOME> 6402815
<REALIZED-GAINS-CURRENT> (10840)
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 6391975
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (6402815)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1211792558
<NUMBER-OF-SHARES-REDEEMED> (1223792174)
<SHARES-REINVESTED> 1676544
<NET-CHANGE-IN-ASSETS> (10333912)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 42871
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 294990
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 769888
<AVERAGE-NET-ASSETS> 0
<PER-SHARE-NAV-BEGIN> 0.00
<PER-SHARE-NII> 0.00
<PER-SHARE-GAIN-APPREC> 0.00
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 0.00
<EXPENSE-RATIO> 0.00
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information from the Short Term
Investment Trust Tax Advantage Portfolio Cash Management Shares
August 31,1999 Annual Report.
</LEGEND>
<CIK> 0000205007
<NAME> SHORT TERM INVESTMENT TRUST
<SERIES>
<NUMBER> 7
<NAME> TAX ADVANTAGE PORTFOLIO CASH MANAGEMENT SHARES
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> AUG-31-1999
<PERIOD-END> AUG-31-1999
<INVESTMENTS-AT-COST> 131991375
<INVESTMENTS-AT-VALUE> 131991375
<RECEIVABLES> 1396912
<ASSETS-OTHER> 1144883
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 134533170
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 639880
<TOTAL-LIABILITIES> 639880
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 133861259
<SHARES-COMMON-STOCK> 133861259
<SHARES-COMMON-PRIOR> 144184331
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 32031
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 133893290
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 6803219
<OTHER-INCOME> 0
<EXPENSES-NET> 400404
<NET-INVESTMENT-INCOME> 6402815
<REALIZED-GAINS-CURRENT> (10840)
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 6391975
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (6402815)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1211792558
<NUMBER-OF-SHARES-REDEEMED> (1223792174)
<SHARES-REINVESTED> 1676544
<NET-CHANGE-IN-ASSETS> (10333912)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 42871
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 294990
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 769888
<AVERAGE-NET-ASSETS> 0
<PER-SHARE-NAV-BEGIN> 0.00
<PER-SHARE-NII> 0.00
<PER-SHARE-GAIN-APPREC> 0.00
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 0.00
<EXPENSE-RATIO> 0.00
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information from the Short Term
Investment Trust Tax Advantage Portfolio Resource Shares
August 31,1999 Annual Report.
</LEGEND>
<CIK> 0000205007
<NAME> SHORT TERM INVESTMENT TRUST
<SERIES>
<NUMBER> 7
<NAME> TAX ADVANTAGE PORTFOLIO RESOURCE SHARES
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> AUG-31-1999
<PERIOD-END> AUG-31-1999
<INVESTMENTS-AT-COST> 131991375
<INVESTMENTS-AT-VALUE> 131991375
<RECEIVABLES> 1396912
<ASSETS-OTHER> 1144883
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 134533170
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 639880
<TOTAL-LIABILITIES> 639880
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 133861259
<SHARES-COMMON-STOCK> 133861259
<SHARES-COMMON-PRIOR> 144184331
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 32031
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 133893290
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 6803219
<OTHER-INCOME> 0
<EXPENSES-NET> 400404
<NET-INVESTMENT-INCOME> 6402815
<REALIZED-GAINS-CURRENT> (10840)
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 6391975
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (6402815)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1211792558
<NUMBER-OF-SHARES-REDEEMED> (1223792174)
<SHARES-REINVESTED> 1676544
<NET-CHANGE-IN-ASSETS> (10333912)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 42871
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 294990
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 769888
<AVERAGE-NET-ASSETS> 0
<PER-SHARE-NAV-BEGIN> 0.00
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<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 0.00
<EXPENSE-RATIO> 0.00
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
This schedule contains summary financial information from the Short Term
Investment Trust Tax Advantage Portfolio Reserve Shares
August 31,1999 Annual Report.
</LEGEND>
<CIK> 0000205007
<NAME> SHORT TERM INVESTMENT TRUST
<SERIES>
<NUMBER> 7
<NAME> TAX ADVANTAGE PORTFOLIO RESERVE SHARES
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> AUG-31-1999
<PERIOD-END> AUG-31-1999
<INVESTMENTS-AT-COST> 131991375
<INVESTMENTS-AT-VALUE> 131991375
<RECEIVABLES> 1396912
<ASSETS-OTHER> 1144883
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 134533170
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 639880
<TOTAL-LIABILITIES> 639880
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 133861259
<SHARES-COMMON-STOCK> 133861259
<SHARES-COMMON-PRIOR> 144184331
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 32031
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 133893290
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 6803219
<OTHER-INCOME> 0
<EXPENSES-NET> 400404
<NET-INVESTMENT-INCOME> 6402815
<REALIZED-GAINS-CURRENT> (10840)
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 6391975
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (6402815)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1211792558
<NUMBER-OF-SHARES-REDEEMED> (1223792174)
<SHARES-REINVESTED> 1676544
<NET-CHANGE-IN-ASSETS> (10333912)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 42871
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 294990
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 769888
<AVERAGE-NET-ASSETS> 0
<PER-SHARE-NAV-BEGIN> 0.00
<PER-SHARE-NII> 0.00
<PER-SHARE-GAIN-APPREC> 0.00
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 0.00
<EXPENSE-RATIO> 0.00
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
