<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000701939
<NAME> SEI DAILY INCOME TRUST
<SERIES>
<NUMBER> 170
<NAME> CORPORATE DAILY INCOME CLASS A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> JAN-31-2000
<PERIOD-START> FEB-01-2000
<PERIOD-END> JUL-31-2000
<INVESTMENTS-AT-COST> 95786
<INVESTMENTS-AT-VALUE> 95250
<RECEIVABLES> 912
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 96162
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 658
<TOTAL-LIABILITIES> 551
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 96254
<SHARES-COMMON-STOCK> 48183
<SHARES-COMMON-PRIOR> 57918
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> (9)
<ACCUMULATED-NET-GAINS> 0
<OVERDISTRIBUTION-GAINS> (205)
<ACCUM-APPREC-OR-DEPREC> (536)
<NET-ASSETS> 95504
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 3042
<OTHER-INCOME> 0
<EXPENSES-NET> (169)
<NET-INVESTMENT-INCOME> 2873
<REALIZED-GAINS-CURRENT> (97)
<APPREC-INCREASE-CURRENT> 634
<NET-CHANGE-FROM-OPS> 3410
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (2870)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 36549
<NUMBER-OF-SHARES-REDEEMED> (47137)
<SHARES-REINVESTED> 853
<NET-CHANGE-IN-ASSETS> (18614)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> (12)
<OVERDIST-NET-GAINS-PRIOR> (108)
<GROSS-ADVISORY-FEES> 48
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 354
<AVERAGE-NET-ASSETS> 97278
<PER-SHARE-NAV-BEGIN> 1.97
<PER-SHARE-NII> 0.06
<PER-SHARE-GAIN-APPREC> 0.01
<PER-SHARE-DIVIDEND> (0.06)
<PER-SHARE-DISTRIBUTIONS> 0.00
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 1.98
<EXPENSE-RATIO> 0.35
</TABLE>
