<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000088498
<NAME> SECURITY INCOME FUND
<SERIES>
<NUMBER> 031
<NAME> LIMITED MATURITY BOND - A
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 4-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> APR-30-2000
<EXCHANGE-RATE> 1.000
<INVESTMENTS-AT-COST> 6585
<INVESTMENTS-AT-VALUE> 6239
<RECEIVABLES> 131
<ASSETS-OTHER> 315
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 6685
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 27
<TOTAL-LIABILITIES> 27
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 7213
<SHARES-COMMON-STOCK> 575
<SHARES-COMMON-PRIOR> 582
<ACCUMULATED-NII-CURRENT> (5)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (204)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (346)
<NET-ASSETS> 6658
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 163
<OTHER-INCOME> 0
<EXPENSES-NET> 23
<NET-INVESTMENT-INCOME> 140
<REALIZED-GAINS-CURRENT> (176)
<APPREC-INCREASE-CURRENT> 49
<NET-CHANGE-FROM-OPS> 13
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (116)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 26
<NUMBER-OF-SHARES-REDEEMED> (44)
<SHARES-REINVESTED> 11
<NET-CHANGE-IN-ASSETS> (170)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (28)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 23
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 23
<AVERAGE-NET-ASSETS> 6619
<PER-SHARE-NAV-BEGIN> 9.57
<PER-SHARE-NII> .21
<PER-SHARE-GAIN-APPREC> (.18)
<PER-SHARE-DIVIDEND> (.21)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 9.39
<EXPENSE-RATIO> .85
</TABLE>
