<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000088498
<NAME> SECURITY INCOME FUND
<SERIES>
<NUMBER> 052
<NAME> HIGH YIELD - B
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> JUN-30-2000
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<TOTAL-ASSETS> 11073
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<SENIOR-LONG-TERM-DEBT> 0
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<TOTAL-LIABILITIES> 233
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<SHARES-COMMON-PRIOR> 328
<ACCUMULATED-NII-CURRENT> (4)
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<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (1579)
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<NET-INVESTMENT-INCOME> 436
<REALIZED-GAINS-CURRENT> (273)
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<NET-CHANGE-FROM-OPS> (229)
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<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 38
<NUMBER-OF-SHARES-REDEEMED> (43)
<SHARES-REINVESTED> 12
<NET-CHANGE-IN-ASSETS> (178)
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<PER-SHARE-NAV-BEGIN> 13.62
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<EXPENSE-RATIO> 1.54
</TABLE>
