<PAGE> PAGE 1
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000 C000000 100852
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011 B000001 8-25845
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<PAGE> PAGE 2
013 B030001 10281
014 A000001 SELIGMAN SERVICES, INC.
014 B000001 8-47717
015 A000001 INVESTORS FIDUCIARY TRUST COMPANY
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020 C000005 5
020 A000006 DONALDSON, LUFKIN & JENRETTE SECURITIES CORP.
020 B000006 13-2741729
020 C000006 5
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020 A000008 CREDIT SUISSE FIRST BOSTON CORPORATION
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020 A000009 J.P. MORGAN SECURITIES
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<PAGE> PAGE 3
022 C000002 137775
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022 B000003 25-1471636
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022 C000004 58598
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022 B000009 13-4941092
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<PAGE> PAGE 4
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<PAGE> PAGE 5
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<PAGE> PAGE 6
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<PAGE> PAGE 7
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<PAGE> PAGE 8
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<PAGE> PAGE 9
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SIGNATURE THOMAS G. ROSE
TITLE TREASURER
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER> 001
<NAME> SELIGMAN INCOME FUND CLASS A
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> JUN-30-1999
<INVESTMENTS-AT-COST> 305883
<INVESTMENTS-AT-VALUE> 324651
<RECEIVABLES> 3605
<ASSETS-OTHER> 258
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 328514
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1367
<TOTAL-LIABILITIES> 1367
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 308970
<SHARES-COMMON-STOCK> 16754<F1>
<SHARES-COMMON-PRIOR> 17845<F1>
<ACCUMULATED-NII-CURRENT> 209
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (800)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 18768
<NET-ASSETS> 236038<F1>
<DIVIDEND-INCOME> 1237<F1>
<INTEREST-INCOME> 4833<F1>
<OTHER-INCOME> 0<F1>
<EXPENSES-NET> (1389)<F1>
<NET-INVESTMENT-INCOME> 4681<F1>
<REALIZED-GAINS-CURRENT> 507
<APPREC-INCREASE-CURRENT> (6619)
<NET-CHANGE-FROM-OPS> 17
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (4780)<F1>
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 588<F1>
<NUMBER-OF-SHARES-REDEEMED> (1912)<F1>
<SHARES-REINVESTED> 233<F1>
<NET-CHANGE-IN-ASSETS> (28271)
<ACCUMULATED-NII-PRIOR> 317
<ACCUMULATED-GAINS-PRIOR> (1307)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 734<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1389<F1>
<AVERAGE-NET-ASSETS> 246530<F1>
<PER-SHARE-NAV-BEGIN> 14.35<F1>
<PER-SHARE-NII> 0.27<F1>
<PER-SHARE-GAIN-APPREC> (0.25)<F1>
<PER-SHARE-DIVIDEND> 0<F1>
<PER-SHARE-DISTRIBUTIONS> (0.28)<F1>
<RETURNS-OF-CAPITAL> 0<F1>
<PER-SHARE-NAV-END> 14.09<F1>
<EXPENSE-RATIO> 1.14<F1>
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
<FN>
<F1>Class A only. All other data are fund level.
</FN>
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER> 002
<NAME> SELIGMAN INCOME FUND CLASS B
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> JUN-30-1999
<INVESTMENTS-AT-COST> 305883
<INVESTMENTS-AT-VALUE> 324651
<RECEIVABLES> 3605
<ASSETS-OTHER> 258
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 328514
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1367
<TOTAL-LIABILITIES> 1367
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 308970
<SHARES-COMMON-STOCK> 1590<F1>
<SHARES-COMMON-PRIOR> 1457<F1>
<ACCUMULATED-NII-CURRENT> 209
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (800)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 18768
<NET-ASSETS> 22328<F1>
<DIVIDEND-INCOME> 108<F1>
<INTEREST-INCOME> 421<F1>
<OTHER-INCOME> 0<F1>
<EXPENSES-NET> (201)<F1>
<NET-INVESTMENT-INCOME> 328<F1>
<REALIZED-GAINS-CURRENT> 507
<APPREC-INCREASE-CURRENT> (6619)
<NET-CHANGE-FROM-OPS> 17
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (338)<F1>
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 397<F1>
<NUMBER-OF-SHARES-REDEEMED> (299)<F1>
<SHARES-REINVESTED> 16<F1>
<NET-CHANGE-IN-ASSETS> (28271)
<ACCUMULATED-NII-PRIOR> 317
<ACCUMULATED-GAINS-PRIOR> (1307)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 64<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 201<F1>
<AVERAGE-NET-ASSETS> 21456<F1>
<PER-SHARE-NAV-BEGIN> 14.30<F1>
<PER-SHARE-NII> 0.22<F1>
<PER-SHARE-GAIN-APPREC> (0.25)<F1>
<PER-SHARE-DIVIDEND> 0<F1>
<PER-SHARE-DISTRIBUTIONS> (0.22)<F1>
<RETURNS-OF-CAPITAL> 0<F1>
<PER-SHARE-NAV-END> 14.05<F1>
<EXPENSE-RATIO> 1.89<F1>
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
<FN>
<F1>Class B only. All other data are fund level.
</FN>
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER> 003
<NAME> SELIGMAN INCOME FUND CLASS C
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> JUN-30-1999
<INVESTMENTS-AT-COST> 305883
<INVESTMENTS-AT-VALUE> 324651
<RECEIVABLES> 3605
<ASSETS-OTHER> 258
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 328514
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 1367
<TOTAL-LIABILITIES> 1367
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 308970
<SHARES-COMMON-STOCK> 13<F1>
<SHARES-COMMON-PRIOR> 0<F1>
<ACCUMULATED-NII-CURRENT> 209
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (800)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 18768
<NET-ASSETS> 181<F1>
<DIVIDEND-INCOME> 0<F1>
<INTEREST-INCOME> 0<F1>
<OTHER-INCOME> 0<F1>
<EXPENSES-NET> 0<F1>
<NET-INVESTMENT-INCOME> 0<F1>
<REALIZED-GAINS-CURRENT> 507
<APPREC-INCREASE-CURRENT> (6619)
<NET-CHANGE-FROM-OPS> 17
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0<F1>
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 13<F1>
<NUMBER-OF-SHARES-REDEEMED> 0<F1>
<SHARES-REINVESTED> 0<F1>
<NET-CHANGE-IN-ASSETS> (28271)
<ACCUMULATED-NII-PRIOR> 317
<ACCUMULATED-GAINS-PRIOR> (1307)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 0<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 0<F1>
<AVERAGE-NET-ASSETS> 49<F1>
<PER-SHARE-NAV-BEGIN> 14.14<F1>
<PER-SHARE-NII> 0.03<F1>
<PER-SHARE-GAIN-APPREC> (0.01)<F1>
<PER-SHARE-DIVIDEND> 0<F1>
<PER-SHARE-DISTRIBUTIONS> (0.11)<F1>
<RETURNS-OF-CAPITAL> 0<F1>
<PER-SHARE-NAV-END> 14.05<F1>
<EXPENSE-RATIO> 1.91<F1>
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
<FN>
<F1>Class C only. All other data are fund level.
</FN>
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER> 004
<NAME> SELIGMAN INCOME FUND CLASS D
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> JUN-30-1999
<INVESTMENTS-AT-COST> 305883
<INVESTMENTS-AT-VALUE> 324651
<RECEIVABLES> 3605
<ASSETS-OTHER> 258
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 328514
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 70
<OTHER-ITEMS-LIABILITIES> 1367
<TOTAL-LIABILITIES> 1367
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 308970
<SHARES-COMMON-STOCK> 4882<F1>
<SHARES-COMMON-PRIOR> 5471<F1>
<ACCUMULATED-NII-CURRENT> 209
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (800)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 18768
<NET-ASSETS> 68600<F1>
<DIVIDEND-INCOME> 368<F1>
<INTEREST-INCOME> 1439<F1>
<OTHER-INCOME> 0<F1>
<EXPENSES-NET> (687)<F1>
<NET-INVESTMENT-INCOME> 1120<F1>
<REALIZED-GAINS-CURRENT> 507
<APPREC-INCREASE-CURRENT> (6619)
<NET-CHANGE-FROM-OPS> 17
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1119)<F1>
<DISTRIBUTIONS-OF-GAINS> 0<F1>
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 366<F1>
<NUMBER-OF-SHARES-REDEEMED> (1018)<F1>
<SHARES-REINVESTED> 63<F1>
<NET-CHANGE-IN-ASSETS> (28271)
<ACCUMULATED-NII-PRIOR> 317
<ACCUMULATED-GAINS-PRIOR> (1307)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 218<F1>
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 687<F1>
<AVERAGE-NET-ASSETS> 73422<F1>
<PER-SHARE-NAV-BEGIN> 14.30<F1>
<PER-SHARE-NII> 0.22<F1>
<PER-SHARE-GAIN-APPREC> (0.25)<F1>
<PER-SHARE-DIVIDEND> 0<F1>
<PER-SHARE-DISTRIBUTIONS> (0.22)<F1>
<RETURNS-OF-CAPITAL> 0<F1>
<PER-SHARE-NAV-END> 14.05<F1>
<EXPENSE-RATIO> 1.89<F1>
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
<FN>
<F1>Class D only. All other data are fund level.
</FN>
</TABLE>
