<PAGE> PAGE 1
000 A000000 06/30/98
000 C000000 0000088498
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0.a
000 J000000 A
001 A000000 SECURITY INCOME FUND
001 B000000 811-2120
001 C000000 7854313127
002 A000000 700 HARRISON
002 B000000 TOPEKA
002 C000000 KS
002 D010000 66636
002 D020000 0001
003 000000 N
004 000000 N
005 000000 N
006 000000 N
007 A000000 Y
007 B000000 7
007 C010100 1
007 C020100 CORPORATE BOND
007 C030100 N
007 C010200 2
007 C020200 U.S. GOVERNMENT
007 C030200 N
007 C010300 3
007 C020300 LIMITED MATURITY BOND
007 C030300 N
007 C010400 4
007 C020400 MFR GLOBAL HIGH YIELD
007 C030400 N
007 C010500 5
007 C020500 HIGH YIELD
007 C030500 N
007 C010600 6
007 C020600 MFR EMERGING MARKETS TOTAL RETURN
007 C030600 N
007 C010700 7
007 C020700 MFR GLOBAL ASSET ALLOCATION
007 C030700 N
007 C010800 8
007 C010900 9
007 C011000 10
010 A00AA01 SECURITY MANAGEMENT COMPANY, LLC
010 B00AA01 84-01497
010 C01AA01 TOPEKA
010 C02AA01 KS
<PAGE> PAGE 2
010 C03AA01 66636
010 C04AA01 0001
011 A00AA01 SECURITY DISTRIBUTORS, INC.
011 B00AA01 8-10781
011 C01AA01 TOPEKA
011 C02AA01 KS
011 C03AA01 66636
011 C04AA01 0001
012 A00AA01 SECURITY MANAGEMENT COMPANY, LLC
012 B00AA01 84-01497
012 C01AA01 TOPEKA
012 C02AA01 KS
012 C03AA01 66636
012 C04AA01 0001
013 A00AA01 ERNST & YOUNG LLP
013 B01AA01 KANSAS CITY
013 B02AA01 MO
013 B03AA01 64105
013 B04AA01 2143
018 00AA00 Y
019 A00AA00 Y
019 B00AA00 31
019 C00AA00 SECURITYFU
020 A000001 BHF SECURITIES CORPORATION
020 B000001 74-2817852
020 C000001 3
020 A000002 DEAN WITTER REYNOLDS, INC
020 B000002 94-1671384
020 C000002 1
020 C000003 0
020 C000004 0
020 C000005 0
020 C000006 0
020 C000007 0
020 C000008 0
020 C000009 0
020 C000010 0
021 000000 4
022 A000001 MERRILL LYNCH
022 B000001 13-5674085
022 C000001 21360
022 D000001 13200
022 A000002 SOLOMON BROTHERS, INC
022 B000002 13-3082694
022 C000002 3217
022 D000002 3477
022 A000003 DONALDSON, LUFKIN & JENRETTE SECURITIES CORP
022 B000003 13-2741729
022 C000003 1343
022 D000003 1955
022 A000004 BEAR STEARNS
<PAGE> PAGE 3
022 B000004 13-3299429
022 C000004 1495
022 D000004 1549
022 A000005 BAUM (GEORGE K) & COMPANY
022 B000005 43-1661917
022 C000005 2870
022 D000005 0
022 A000006 GOLDMAN SACHS & COMPANY
022 B000006 13-5108880
022 C000006 2518
022 D000006 221
022 A000007 NATIONSBANK
022 B000007 75-0520130
022 C000007 1532
022 D000007 1114
022 A000008 PRUDENTIAL-BACHE SECURITIES INC
022 B000008 22-2347336
022 C000008 1601
022 D000008 1034
022 A000009 FIRST BOSTON CORPORATION (THE)
022 B000009 13-5659485
022 C000009 1068
022 D000009 1326
022 A000010 LEHMAN BROTHERS INC
022 B000010 13-2518466
022 C000010 100
022 D000010 1206
023 C000000 45335
023 D000000 36368
024 00AA00 N
025 D00AA01 0
025 D00AA02 0
025 D00AA03 0
025 D00AA04 0
025 D00AA05 0
025 D00AA06 0
025 D00AA07 0
025 D00AA08 0
026 A000000 Y
026 B000000 Y
026 C000000 N
026 D000000 Y
026 E000000 N
026 F000000 N
026 G010000 N
026 G020000 N
026 H000000 N
027 000000 Y
054 A00AA00 Y
054 B00AA00 Y
054 C00AA00 Y
<PAGE> PAGE 4
054 D00AA00 N
054 E00AA00 N
054 F00AA00 N
054 G00AA00 Y
054 H00AA00 Y
054 I00AA00 N
054 J00AA00 Y
054 K00AA00 N
054 L00AA00 Y
054 M00AA00 Y
054 N00AA00 N
054 O00AA00 Y
058 A00AA00 N
059 00AA00 Y
060 A00AA00 Y
060 B00AA00 Y
061 00AA00 100
077 A000000 Y
077 D000000 Y
077 Q010000 N
077 Q020000 N
077 Q030000 N
078 000000 N
080 A00AA00 NATIONAL UNION FIRE INSURANCE COMPANY
080 C00AA00 6325
081 A00AA00 Y
081 B00AA00 31
082 A00AA00 N
082 B00AA00 0
083 A00AA00 N
083 B00AA00 0
084 A00AA00 N
084 B00AA00 0
085 A00AA00 Y
085 B00AA00 N
086 A010000 0
086 A020000 0
086 B010000 0
086 B020000 0
086 C010000 0
086 C020000 0
086 D010000 0
086 D020000 0
086 E010000 0
086 E020000 0
086 F010000 0
086 F020000 0
008 A000101 SECURITY MANAGEMENT COMPANY, LLC
008 B000101 A
008 C000101 801-8008
008 D010101 TOPEKA
<PAGE> PAGE 5
008 D020101 KS
008 D030101 66636
008 D040101 0001
015 A000101 UMB BANK, N.A.
015 B000101 C
015 C010101 KANSAS CITY
015 C020101 MO
015 C030101 64106
015 E010101 X
028 A010100 590
028 A020100 230
028 A030100 0
028 A040100 1038
028 B010100 2229
028 B020100 215
028 B030100 0
028 B040100 948
028 C010100 436
028 C020100 231
028 C030100 0
028 C040100 1483
028 D010100 387
028 D020100 231
028 D030100 0
028 D040100 1438
028 E010100 1861
028 E020100 223
028 E030100 0
028 E040100 2192
028 F010100 2702
028 F020100 245
028 F030100 0
028 F040100 1207
028 G010100 8205
028 G020100 1375
028 G030100 0
028 G040100 8306
028 H000100 636
029 000100 Y
030 A000100 16
030 B000100 4.75
030 C000100 0.00
031 A000100 3
031 B000100 0
032 000100 13
033 000100 0
034 000100 Y
035 000100 10
036 A000100 N
036 B000100 0
037 000100 N
<PAGE> PAGE 6
038 000100 0
039 000100 N
040 000100 Y
041 000100 Y
042 A000100 0
042 B000100 0
042 C000100 0
042 D000100 57
042 E000100 0
042 F000100 0
042 G000100 43
042 H000100 0
043 000100 107
044 000100 49
045 000100 Y
046 000100 N
047 000100 Y
048 000100 0.500
048 A010100 0
048 A020100 0.000
048 B010100 0
048 B020100 0.000
048 C010100 0
048 C020100 0.000
048 D010100 0
048 D020100 0.000
048 E010100 0
048 E020100 0.000
048 F010100 0
048 F020100 0.000
048 G010100 0
048 G020100 0.000
048 H010100 0
048 H020100 0.000
048 I010100 0
048 I020100 0.000
048 J010100 0
048 J020100 0.000
048 K010100 0
048 K020100 0.000
049 000100 N
050 000100 N
051 000100 N
052 000100 N
053 A000100 Y
053 B000100 Y
053 C000100 N
055 A000100 Y
055 B000100 N
056 000100 Y
057 000100 N
<PAGE> PAGE 7
062 A000100 Y
062 B000100 0.0
062 C000100 0.0
062 D000100 0.0
062 E000100 0.0
062 F000100 0.0
062 G000100 0.0
062 H000100 0.0
062 I000100 0.0
062 J000100 0.0
062 K000100 0.0
062 L000100 1.5
062 M000100 6.8
062 N000100 16.6
062 O000100 0.0
062 P000100 75.1
062 Q000100 0.0
062 R000100 0.0
063 A000100 0
063 B000100 9.1
064 A000100 N
066 A000100 N
067 000100 N
068 A000100 N
068 B000100 N
069 000100 N
070 A010100 Y
070 A020100 N
070 B010100 N
070 B020100 N
070 C010100 N
070 C020100 N
070 D010100 N
070 D020100 N
070 E010100 N
070 E020100 N
070 F010100 N
070 F020100 N
070 G010100 N
070 G020100 N
070 H010100 N
070 H020100 N
070 I010100 N
070 I020100 N
070 J010100 N
070 J020100 N
070 K010100 N
070 K020100 N
070 L010100 Y
070 L020100 N
070 M010100 N
<PAGE> PAGE 8
070 M020100 N
070 N010100 N
070 N020100 N
070 O010100 Y
070 O020100 N
070 P010100 Y
070 P020100 Y
070 Q010100 N
070 Q020100 N
070 R010100 N
070 R020100 N
071 A000100 25228
071 B000100 23557
071 C000100 63082
071 D000100 75
072 A000100 6
072 B000100 2263
072 C000100 0
072 D000100 0
072 E000100 0
072 F000100 158
072 G000100 28
072 H000100 0
072 I000100 64
072 J000100 2
072 K000100 1
072 L000100 2
072 M000100 5
072 N000100 11
072 O000100 0
072 P000100 0
072 Q000100 0
072 R000100 6
072 S000100 0
072 T000100 107
072 U000100 0
072 V000100 0
072 W000100 7
072 X000100 391
072 Y000100 17
072 Z000100 1889
072AA000100 415
072BB000100 0
072CC010100 0
072CC020100 102
072DD010100 1652
072DD020100 193
072EE000100 0
073 A010100 0.2100
073 A020100 0.1800
073 B000100 0.0000
<PAGE> PAGE 9
073 C000100 0.0000
074 A000100 105
074 B000100 0
074 C000100 0
074 D000100 63646
074 E000100 0
074 F000100 0
074 G000100 0
074 H000100 0
074 I000100 0
074 J000100 40
074 K000100 8
074 L000100 954
074 M000100 0
074 N000100 64753
074 O000100 0
074 P000100 64
074 Q000100 0
074 R010100 0
074 R020100 0
074 R030100 0
074 R040100 79
074 S000100 0
074 T000100 64610
074 U010100 7886
074 U020100 1221
074 V010100 7.09
074 V020100 7.13
074 W000100 0.0000
074 X000100 6136
074 Y000100 0
075 A000100 0
075 B000100 63688
076 000100 0.00
008 A000201 SECURITY MANAGEMENT COMPANY, LLC
008 B000201 A
008 C000201 801-8008
008 D010201 TOPEKA
008 D020201 KS
008 D030201 66636
008 D040201 0001
015 A000201 UMB BANK, N.A.
015 B000201 C
015 C010201 KANSAS CITY
015 C020201 MO
015 C030201 64106
015 E010201 X
028 A010200 53
028 A020200 32
028 A030200 0
028 A040200 609
<PAGE> PAGE 10
028 B010200 251
028 B020200 32
028 B030200 0
028 B040200 96
028 C010200 1157
028 C020200 36
028 C030200 0
028 C040200 384
028 D010200 172
028 D020200 41
028 D030200 0
028 D040200 240
028 E010200 817
028 E020200 46
028 E030200 0
028 E040200 208
028 F010200 6675
028 F020200 65
028 F030200 0
028 F040200 1111
028 G010200 9125
028 G020200 252
028 G030200 0
028 G040200 2648
028 H000200 633
029 000200 Y
030 A000200 11
030 B000200 4.75
030 C000200 0.00
031 A000200 2
031 B000200 0
032 000200 9
033 000200 0
034 000200 Y
035 000200 2
036 A000200 N
036 B000200 0
037 000200 N
038 000200 0
039 000200 N
040 000200 Y
041 000200 Y
042 A000200 0
042 B000200 0
042 C000200 0
042 D000200 56
042 E000200 0
042 F000200 0
042 G000200 44
042 H000200 0
043 000200 18
<PAGE> PAGE 11
044 000200 8
045 000200 Y
046 000200 N
047 000200 Y
048 000200 0.500
048 A010200 0
048 A020200 0.000
048 B010200 0
048 B020200 0.000
048 C010200 0
048 C020200 0.000
048 D010200 0
048 D020200 0.000
048 E010200 0
048 E020200 0.000
048 F010200 0
048 F020200 0.000
048 G010200 0
048 G020200 0.000
048 H010200 0
048 H020200 0.000
048 I010200 0
048 I020200 0.000
048 J010200 0
048 J020200 0.000
048 K010200 0
048 K020200 0.000
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 Y
057 000200 N
062 A000200 Y
062 B000200 0.0
062 C000200 0.0
062 D000200 0.0
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 2.8
062 M000200 38.3
<PAGE> PAGE 12
062 N000200 58.9
062 O000200 0.0
062 P000200 0.0
062 Q000200 0.0
062 R000200 0.0
063 A000200 0
063 B000200 14.9
064 A000200 Y
064 B000200 N
066 A000200 N
067 000200 N
068 A000200 N
068 B000200 N
069 000200 N
070 A010200 Y
070 A020200 N
070 B010200 N
070 B020200 N
070 C010200 N
070 C020200 N
070 D010200 N
070 D020200 N
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 N
070 J020200 N
070 K010200 N
070 K020200 N
070 L010200 Y
070 L020200 N
070 M010200 N
070 M020200 N
070 N010200 N
070 N020200 N
070 O010200 Y
070 O020200 N
070 P010200 Y
070 P020200 Y
070 Q010200 N
070 Q020200 N
070 R010200 N
070 R020200 N
071 A000200 7728
<PAGE> PAGE 13
071 B000200 1300
071 C000200 9684
071 D000200 27
072 A000200 6
072 B000200 336
072 C000200 0
072 D000200 0
072 E000200 0
072 F000200 25
072 G000200 4
072 H000200 0
072 I000200 17
072 J000200 1
072 K000200 0
072 L000200 1
072 M000200 0
072 N000200 5
072 O000200 0
072 P000200 0
072 Q000200 0
072 R000200 9
072 S000200 0
072 T000200 18
072 U000200 0
072 V000200 0
072 W000200 0
072 X000200 80
072 Y000200 25
072 Z000200 281
072AA000200 12
072BB000200 0
072CC010200 102
072CC020200 0
072DD010200 245
072DD020200 38
072EE000200 0
073 A010200 0.1400
073 A020200 0.1100
073 B000200 0.0000
073 C000200 0.0000
074 A000200 230
074 B000200 0
074 C000200 0
074 D000200 15145
074 E000200 0
074 F000200 0
074 G000200 0
074 H000200 0
074 I000200 0
074 J000200 0
074 K000200 1
<PAGE> PAGE 14
074 L000200 232
074 M000200 0
074 N000200 15608
074 O000200 0
074 P000200 1
074 Q000200 0
074 R010200 0
074 R020200 0
074 R030200 0
074 R040200 26
074 S000200 0
074 T000200 15581
074 U010200 2425
074 U020200 783
074 V010200 4.86
074 V020200 4.85
074 W000200 0.0000
074 X000200 2559
074 Y000200 0
075 A000200 0
075 B000200 11518
076 000200 0.00
008 A000301 SECURITY MANAGEMENT COMPANY, LLC
008 B000301 A
008 C000301 801-8008
008 D010301 TOPEKA
008 D020301 KS
008 D030301 66636
008 D040301 0001
015 A000301 UMB BANK, N.A.
015 B000301 C
015 C010301 KANSAS CITY
015 C020301 MO
015 C030301 64106
015 E010301 X
028 A010300 32
028 A020300 34
028 A030300 0
028 A040300 -20
028 B010300 30
028 B020300 33
028 B030300 0
028 B040300 11
028 C010300 55
028 C020300 33
028 C030300 0
028 C040300 69
028 D010300 36
028 D020300 30
028 D030300 0
028 D040300 132
<PAGE> PAGE 15
028 E010300 32
028 E020300 30
028 E030300 0
028 E040300 14
028 F010300 29
028 F020300 29
028 F030300 0
028 F040300 84
028 G010300 214
028 G020300 189
028 G030300 0
028 G040300 290
028 H000300 97
029 000300 Y
030 A000300 2
030 B000300 4.75
030 C000300 0.00
031 A000300 0
031 B000300 0
032 000300 2
033 000300 0
034 000300 Y
035 000300 0
036 A000300 N
036 B000300 0
037 000300 N
038 000300 0
039 000300 N
040 000300 Y
041 000300 Y
042 A000300 0
042 B000300 0
042 C000300 0
042 D000300 66
042 E000300 0
042 F000300 0
042 G000300 0
042 H000300 34
043 000300 12
044 000300 4
045 000300 Y
046 000300 N
047 000300 Y
048 000300 0.500
048 A010300 0
048 A020300 0.000
048 B010300 0
048 B020300 0.000
048 C010300 0
048 C020300 0.000
048 D010300 0
<PAGE> PAGE 16
048 D020300 0.000
048 E010300 0
048 E020300 0.000
048 F010300 0
048 F020300 0.000
048 G010300 0
048 G020300 0.000
048 H010300 0
048 H020300 0.000
048 I010300 0
048 I020300 0.000
048 J010300 0
048 J020300 0.000
048 K010300 0
048 K020300 0.000
049 000300 N
050 000300 N
051 000300 N
052 000300 N
053 A000300 Y
053 B000300 Y
053 C000300 N
055 A000300 Y
055 B000300 N
056 000300 Y
057 000300 N
062 A000300 Y
062 B000300 0.0
062 C000300 0.0
062 D000300 0.0
062 E000300 0.0
062 F000300 0.0
062 G000300 0.0
062 H000300 0.0
062 I000300 0.0
062 J000300 0.0
062 K000300 0.0
062 L000300 3.3
062 M000300 1.6
062 N000300 14.9
062 O000300 0.0
062 P000300 80.2
062 Q000300 0.0
062 R000300 0.0
063 A000300 0
063 B000300 6.0
064 A000300 Y
064 B000300 N
066 A000300 N
067 000300 N
068 A000300 N
<PAGE> PAGE 17
068 B000300 N
069 000300 N
070 A010300 Y
070 A020300 N
070 B010300 N
070 B020300 N
070 C010300 N
070 C020300 N
070 D010300 N
070 D020300 N
070 E010300 N
070 E020300 N
070 F010300 N
070 F020300 N
070 G010300 N
070 G020300 N
070 H010300 N
070 H020300 N
070 I010300 N
070 I020300 N
070 J010300 Y
070 J020300 N
070 K010300 Y
070 K020300 N
070 L010300 Y
070 L020300 Y
070 M010300 N
070 M020300 N
070 N010300 N
070 N020300 N
070 O010300 Y
070 O020300 N
070 P010300 Y
070 P020300 Y
070 Q010300 N
070 Q020300 N
070 R010300 N
070 R020300 N
071 A000300 3068
071 B000300 2986
071 C000300 6611
071 D000300 91
072 A000300 6
072 B000300 241
072 C000300 0
072 D000300 0
072 E000300 0
072 F000300 17
072 G000300 3
072 H000300 0
072 I000300 3
<PAGE> PAGE 18
072 J000300 3
072 K000300 0
072 L000300 2
072 M000300 1
072 N000300 12
072 O000300 0
072 P000300 0
072 Q000300 0
072 R000300 2
072 S000300 0
072 T000300 12
072 U000300 0
072 V000300 0
072 W000300 0
072 X000300 55
072 Y000300 18
072 Z000300 204
072AA000300 52
072BB000300 0
072CC010300 0
072CC020300 33
072DD010300 179
072DD020300 27
072EE000300 0
073 A010300 0.3200
073 A020300 0.2600
073 B000300 0.0000
073 C000300 0.0000
074 A000300 105
074 B000300 0
074 C000300 0
074 D000300 6452
074 E000300 0
074 F000300 0
074 G000300 0
074 H000300 0
074 I000300 0
074 J000300 0
074 K000300 0
074 L000300 128
074 M000300 0
074 N000300 6685
074 O000300 0
074 P000300 0
074 Q000300 0
074 R010300 0
074 R020300 0
074 R030300 0
074 R040300 11
074 S000300 0
074 T000300 6674
<PAGE> PAGE 19
074 U010300 543
074 U020300 104
074 V010300 10.32
074 V020300 10.31
074 W000300 0.0000
074 X000300 298
074 Y000300 0
075 A000300 0
075 B000300 6680
076 000300 0.00
008 A000401 MFR ADVISORS, INC.
008 B000401 A
008 C000401 801-38015
008 D010401 NEW YORK
008 D020401 NY
008 D030401 10006
008 A000402 LEXINGTON MANAGEMENT CORPORATION
008 B000402 S
008 C000402 801-8281
008 D010402 SADDLE BROOK
008 D020402 NJ
008 D030402 07663
015 A000401 CHASE MANHATTAN BANK, N.A.
015 B000401 C
015 C010401 BROOKLYN
015 C020401 NY
015 C030401 11245
015 E010401 X
028 A010400 58
028 A020400 0
028 A030400 0
028 A040400 24
028 B010400 24
028 B020400 0
028 B030400 0
028 B040400 42
028 C010400 24
028 C020400 120
028 C030400 0
028 C040400 43
028 D010400 -41
028 D020400 0
028 D030400 0
028 D040400 8
028 E010400 13
028 E020400 0
028 E030400 0
028 E040400 1852
028 F010400 6
028 F020400 84
028 F030400 0
<PAGE> PAGE 20
028 F040400 35
028 G010400 84
028 G020400 204
028 G030400 0
028 G040400 2004
028 H000400 26
029 000400 Y
030 A000400 1
030 B000400 4.75
030 C000400 0.00
031 A000400 0
031 B000400 0
032 000400 1
033 000400 0
034 000400 Y
035 000400 0
036 A000400 N
036 B000400 0
037 000400 N
038 000400 0
039 000400 N
040 000400 Y
041 000400 Y
042 A000400 0
042 B000400 0
042 C000400 0
042 D000400 0
042 E000400 0
042 F000400 0
042 G000400 0
042 H000400 0
043 000400 14
044 000400 0
045 000400 Y
046 000400 N
047 000400 Y
048 000400 0.750
048 A010400 0
048 A020400 0.000
048 B010400 0
048 B020400 0.000
048 C010400 0
048 C020400 0.000
048 D010400 0
048 D020400 0.000
048 E010400 0
048 E020400 0.000
048 F010400 0
048 F020400 0.000
048 G010400 0
048 G020400 0.000
<PAGE> PAGE 21
048 H010400 0
048 H020400 0.000
048 I010400 0
048 I020400 0.000
048 J010400 0
048 J020400 0.000
048 K010400 0
048 K020400 0.000
049 000400 N
050 000400 N
051 000400 N
052 000400 N
053 A000400 Y
053 B000400 Y
053 C000400 N
055 A000400 N
055 B000400 N
056 000400 Y
057 000400 N
062 A000400 Y
062 B000400 0.0
062 C000400 0.0
062 D000400 0.0
062 E000400 0.0
062 F000400 0.0
062 G000400 0.0
062 H000400 0.0
062 I000400 0.0
062 J000400 0.0
062 K000400 0.0
062 L000400 5.4
062 M000400 0.0
062 N000400 0.0
062 O000400 0.0
062 P000400 35.7
062 Q000400 58.9
062 R000400 0.0
063 A000400 0
063 B000400 13.0
064 A000400 Y
064 B000400 N
066 A000400 N
067 000400 N
068 A000400 N
068 B000400 Y
069 000400 N
070 A010400 Y
070 A020400 N
070 B010400 N
070 B020400 N
070 C010400 Y
<PAGE> PAGE 22
070 C020400 Y
070 D010400 N
070 D020400 N
070 E010400 Y
070 E020400 N
070 F010400 N
070 F020400 N
070 G010400 Y
070 G020400 N
070 H010400 N
070 H020400 N
070 I010400 Y
070 I020400 N
070 J010400 Y
070 J020400 Y
070 K010400 Y
070 K020400 N
070 L010400 Y
070 L020400 Y
070 M010400 Y
070 M020400 Y
070 N010400 N
070 N020400 N
070 O010400 Y
070 O020400 N
070 P010400 Y
070 P020400 Y
070 Q010400 Y
070 Q020400 N
070 R010400 Y
070 R020400 N
071 A000400 1320
071 B000400 2689
071 C000400 5353
071 D000400 50
072 A000400 6
072 B000400 377
072 C000400 0
072 D000400 0
072 E000400 -12
072 F000400 23
072 G000400 24
072 H000400 0
072 I000400 4
072 J000400 6
072 K000400 0
072 L000400 1
072 M000400 0
072 N000400 6
072 O000400 0
072 P000400 0
<PAGE> PAGE 23
072 Q000400 0
072 R000400 3
072 S000400 0
072 T000400 14
072 U000400 0
072 V000400 0
072 W000400 0
072 X000400 81
072 Y000400 23
072 Z000400 307
072AA000400 50
072BB000400 0
072CC010400 0
072CC020400 183
072DD010400 150
072DD020400 59
072EE000400 0
073 A010400 0.4000
073 A020400 0.3600
073 B000400 0.0000
073 C000400 0.0000
074 A000400 88
074 B000400 0
074 C000400 0
074 D000400 4269
074 E000400 0
074 F000400 0
074 G000400 0
074 H000400 0
074 I000400 0
074 J000400 156
074 K000400 0
074 L000400 21
074 M000400 0
074 N000400 4534
074 O000400 0
074 P000400 0
074 Q000400 0
074 R010400 0
074 R020400 0
074 R030400 0
074 R040400 21
074 S000400 0
074 T000400 4513
074 U010400 293
074 U020400 167
074 V010400 0.00
074 V020400 9.78
074 W000400 9.8200
074 X000400 0
074 Y000400 0
<PAGE> PAGE 24
075 A000400 0
075 B000400 6075
076 000400 0.00
008 A000501 SECURITY MANAGEMENT COMPANY, LLC
008 B000501 A
008 C000501 801-8008
008 D010501 TOPEKA
008 D020501 KS
008 D030501 66636
008 D040501 0001
015 A000501 UMB BANK, N.A.
015 B000501 C
015 C010501 KANSAS CITY
015 C020501 MO
015 C030501 64106
015 E010501 X
028 A010500 103
028 A020500 59
028 A030500 0
028 A040500 4
028 B010500 188
028 B020500 53
028 B030500 0
028 B040500 1043
028 C010500 128
028 C020500 57
028 C030500 0
028 C040500 37
028 D010500 57
028 D020500 54
028 D030500 0
028 D040500 418
028 E010500 40
028 E020500 56
028 E030500 0
028 E040500 68
028 F010500 57
028 F020500 59
028 F030500 0
028 F040500 20
028 G010500 573
028 G020500 338
028 G030500 0
028 G040500 1590
028 H000500 120
029 000500 Y
030 A000500 3
030 B000500 4.75
030 C000500 0.00
031 A000500 1
031 B000500 0
<PAGE> PAGE 25
032 000500 2
033 000500 0
034 000500 Y
035 000500 0
036 A000500 N
036 B000500 0
037 000500 N
038 000500 0
039 000500 N
040 000500 Y
041 000500 Y
042 A000500 0
042 B000500 0
042 C000500 0
042 D000500 84
042 E000500 0
042 F000500 0
042 G000500 16
042 H000500 0
043 000500 26
044 000500 3
045 000500 Y
046 000500 N
047 000500 Y
048 000500 0.600
048 A010500 0
048 A020500 0.000
048 B010500 0
048 B020500 0.000
048 C010500 0
048 C020500 0.000
048 D010500 0
048 D020500 0.000
048 E010500 0
048 E020500 0.000
048 F010500 0
048 F020500 0.000
048 G010500 0
048 G020500 0.000
048 H010500 0
048 H020500 0.000
048 I010500 0
048 I020500 0.000
048 J010500 0
048 J020500 0.000
048 K010500 0
048 K020500 0.000
049 000500 N
050 000500 N
051 000500 N
052 000500 N
<PAGE> PAGE 26
053 A000500 Y
053 B000500 Y
053 C000500 N
055 A000500 Y
055 B000500 N
056 000500 Y
057 000500 N
062 A000500 Y
062 B000500 0.0
062 C000500 0.0
062 D000500 0.0
062 E000500 0.0
062 F000500 0.0
062 G000500 0.0
062 H000500 0.0
062 I000500 0.0
062 J000500 0.0
062 K000500 0.0
062 L000500 3.0
062 M000500 0.0
062 N000500 0.0
062 O000500 0.0
062 P000500 94.0
062 Q000500 1.5
062 R000500 3.0
063 A000500 0
063 B000500 6.8
064 A000500 Y
064 B000500 N
066 A000500 N
067 000500 N
068 A000500 N
068 B000500 N
069 000500 N
070 A010500 Y
070 A020500 N
070 B010500 Y
070 B020500 N
070 C010500 Y
070 C020500 N
070 D010500 Y
070 D020500 N
070 E010500 Y
070 E020500 N
070 F010500 Y
070 F020500 N
070 G010500 Y
070 G020500 N
070 H010500 Y
070 H020500 N
070 I010500 N
<PAGE> PAGE 27
070 I020500 N
070 J010500 Y
070 J020500 N
070 K010500 Y
070 K020500 N
070 L010500 Y
070 L020500 N
070 M010500 N
070 M020500 N
070 N010500 Y
070 N020500 N
070 O010500 Y
070 O020500 Y
070 P010500 Y
070 P020500 Y
070 Q010500 N
070 Q020500 N
070 R010500 N
070 R020500 N
071 A000500 6474
071 B000500 7015
071 C000500 9059
071 D000500 144
072 A000500 6
072 B000500 402
072 C000500 0
072 D000500 0
072 E000500 0
072 F000500 27
072 G000500 4
072 H000500 0
072 I000500 11
072 J000500 5
072 K000500 0
072 L000500 0
072 M000500 1
072 N000500 4
072 O000500 0
072 P000500 0
072 Q000500 0
072 R000500 3
072 S000500 0
072 T000500 26
072 U000500 0
072 V000500 0
072 W000500 0
072 X000500 81
072 Y000500 27
072 Z000500 348
072AA000500 136
072BB000500 0
<PAGE> PAGE 28
072CC010500 0
072CC020500 115
072DD010500 202
072DD020500 137
072EE000500 0
073 A010500 0.6200
073 A020500 0.5500
073 B000500 0.0000
073 C000500 0.0000
074 A000500 101
074 B000500 0
074 C000500 0
074 D000500 8414
074 E000500 273
074 F000500 0
074 G000500 0
074 H000500 0
074 I000500 0
074 J000500 0
074 K000500 0
074 L000500 188
074 M000500 0
074 N000500 8976
074 O000500 0
074 P000500 0
074 Q000500 0
074 R010500 0
074 R020500 0
074 R030500 0
074 R040500 11
074 S000500 0
074 T000500 8965
074 U010500 326
074 U020500 244
074 V010500 15.74
074 V020500 15.71
074 W000500 0.0000
074 X000500 1062
074 Y000500 0
075 A000500 0
075 B000500 9225
076 000500 0.00
008 A000601 MFR ADVISORS, INC
008 B000601 A
008 C000601 801-38015
008 D010601 NEW YORK
008 D020601 NY
008 D030601 10006
008 A000602 LEXINGTON MANAGEMENT CORPORATION
008 B000602 S
008 C000602 801-8281
<PAGE> PAGE 29
008 D010602 SADDLE BROOK
008 D020602 NJ
008 D030602 07663
015 A000601 CHASE MANHATTAN BANK, N.A.
015 B000601 C
015 C010601 BROOKLYN
015 C020601 NY
015 C030601 11245
015 E010601 X
028 A010600 1
028 A020600 0
028 A030600 0
028 A040600 0
028 B010600 0
028 B020600 0
028 B030600 0
028 B040600 0
028 C010600 0
028 C020600 0
028 C030600 0
028 C040600 0
028 D010600 5
028 D020600 0
028 D030600 0
028 D040600 0
028 E010600 0
028 E020600 0
028 E030600 0
028 E040600 0
028 F010600 16
028 F020600 0
028 F030600 0
028 F040600 0
028 G010600 22
028 G020600 0
028 G030600 0
028 G040600 0
028 H000600 5
029 000600 Y
030 A000600 0
030 B000600 4.75
030 C000600 0.00
031 A000600 0
031 B000600 0
032 000600 0
033 000600 0
034 000600 Y
035 000600 0
036 A000600 N
036 B000600 0
037 000600 N
<PAGE> PAGE 30
038 000600 0
039 000600 N
040 000600 Y
041 000600 Y
042 A000600 0
042 B000600 0
042 C000600 0
042 D000600 100
042 E000600 0
042 F000600 0
042 G000600 0
042 H000600 0
043 000600 3
044 000600 0
045 000600 Y
046 000600 N
047 000600 Y
048 000600 1.000
048 A010600 0
048 A020600 0.000
048 B010600 0
048 B020600 0.000
048 C010600 0
048 C020600 0.000
048 D010600 0
048 D020600 0.000
048 E010600 0
048 E020600 0.000
048 F010600 0
048 F020600 0.000
048 G010600 0
048 G020600 0.000
048 H010600 0
048 H020600 0.000
048 I010600 0
048 I020600 0.000
048 J010600 0
048 J020600 0.000
048 K010600 0
048 K020600 0.000
049 000600 N
050 000600 N
051 000600 N
052 000600 N
053 A000600 Y
053 B000600 Y
053 C000600 N
055 A000600 N
055 B000600 N
056 000600 Y
057 000600 N
<PAGE> PAGE 31
062 A000600 N
062 B000600 0.0
062 C000600 0.0
062 D000600 0.0
062 E000600 0.0
062 F000600 0.0
062 G000600 0.0
062 H000600 0.0
062 I000600 0.0
062 J000600 0.0
062 K000600 0.0
062 L000600 0.0
062 M000600 0.0
062 N000600 0.0
062 O000600 0.0
062 P000600 0.0
062 Q000600 0.0
062 R000600 0.0
063 A000600 0
063 B000600 0.0
066 A000600 N
067 000600 N
068 A000600 N
068 B000600 Y
069 000600 N
070 A010600 Y
070 A020600 N
070 B010600 Y
070 B020600 N
070 C010600 Y
070 C020600 Y
070 D010600 Y
070 D020600 N
070 E010600 Y
070 E020600 N
070 F010600 Y
070 F020600 N
070 G010600 Y
070 G020600 N
070 H010600 Y
070 H020600 N
070 I010600 N
070 I020600 N
070 J010600 Y
070 J020600 N
070 K010600 Y
070 K020600 Y
070 L010600 Y
070 L020600 Y
070 M010600 Y
070 M020600 Y
<PAGE> PAGE 32
070 N010600 N
070 N020600 N
070 O010600 Y
070 O020600 N
070 P010600 Y
070 P020600 Y
070 Q010600 Y
070 Q020600 N
070 R010600 Y
070 R020600 N
071 A000600 654
071 B000600 614
071 C000600 1008
071 D000600 123
072 A000600 6
072 B000600 23
072 C000600 7
072 D000600 0
072 E000600 0
072 F000600 5
072 G000600 0
072 H000600 0
072 I000600 0
072 J000600 4
072 K000600 0
072 L000600 0
072 M000600 0
072 N000600 10
072 O000600 0
072 P000600 0
072 Q000600 0
072 R000600 10
072 S000600 0
072 T000600 3
072 U000600 0
072 V000600 0
072 W000600 1
072 X000600 33
072 Y000600 21
072 Z000600 18
072AA000600 86
072BB000600 0
072CC010600 16
072CC020600 0
072DD010600 0
072DD020600 0
072EE000600 0
073 A010600 0.0000
073 A020600 0.0000
073 B000600 0.0000
073 C000600 0.0000
<PAGE> PAGE 33
074 A000600 0
074 B000600 0
074 C000600 34
074 D000600 265
074 E000600 0
074 F000600 777
074 G000600 0
074 H000600 0
074 I000600 0
074 J000600 143
074 K000600 0
074 L000600 27
074 M000600 0
074 N000600 1246
074 O000600 138
074 P000600 0
074 Q000600 0
074 R010600 0
074 R020600 0
074 R030600 0
074 R040600 3
074 S000600 0
074 T000600 1105
074 U010600 54
074 U020600 55
074 V010600 10.09
074 V020600 10.05
074 W000600 0.0000
074 X000600 22
074 Y000600 0
075 A000600 0
075 B000600 1072
076 000600 0.00
008 A000701 MFR ADVISORS, INC.
008 B000701 A
008 C000701 801-38015
008 D010701 NEW YORK
008 D020701 NY
008 D030701 10006
008 A000702 LEXINGTON MANAGEMENT CORPORATION
008 B000702 S
008 C000702 801-8281
008 D010702 SADDLE BROOK
008 D020702 NJ
008 D030702 07663
008 A000703 SECURITY MANAGEMENT COMPANY, LLC
008 B000703 S
008 C000703 801-8008
008 D010703 TOPEKA
008 D020703 KS
008 D030703 66636
<PAGE> PAGE 34
008 D040703 0001
015 A000701 CHASE MANHATTAN BANK, N.A.
015 B000701 C
015 C010701 BROOKLYN
015 C020701 NY
015 C030701 11245
015 E010701 X
028 A010700 0
028 A020700 0
028 A030700 0
028 A040700 0
028 B010700 21
028 B020700 0
028 B030700 0
028 B040700 0
028 C010700 69
028 C020700 0
028 C030700 0
028 C040700 15
028 D010700 48
028 D020700 0
028 D030700 0
028 D040700 0
028 E010700 4
028 E020700 0
028 E030700 0
028 E040700 0
028 F010700 99
028 F020700 0
028 F030700 0
028 F040700 1
028 G010700 241
028 G020700 0
028 G030700 0
028 G040700 16
028 H000700 115
029 000700 Y
030 A000700 3
030 B000700 4.75
030 C000700 0.00
031 A000700 1
031 B000700 0
032 000700 2
033 000700 0
034 000700 Y
035 000700 0
036 A000700 N
036 B000700 0
037 000700 N
038 000700 0
039 000700 N
<PAGE> PAGE 35
040 000700 Y
041 000700 Y
042 A000700 0
042 B000700 0
042 C000700 0
042 D000700 100
042 E000700 0
042 F000700 0
042 G000700 0
042 H000700 0
043 000700 4
044 000700 0
045 000700 Y
046 000700 N
047 000700 Y
048 000700 1.000
048 A010700 0
048 A020700 0.000
048 B010700 0
048 B020700 0.000
048 C010700 0
048 C020700 0.000
048 D010700 0
048 D020700 0.000
048 E010700 0
048 E020700 0.000
048 F010700 0
048 F020700 0.000
048 G010700 0
048 G020700 0.000
048 H010700 0
048 H020700 0.000
048 I010700 0
048 I020700 0.000
048 J010700 0
048 J020700 0.000
048 K010700 0
048 K020700 0.000
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 Y
057 000700 N
062 A000700 N
062 B000700 0.0
<PAGE> PAGE 36
062 C000700 0.0
062 D000700 0.0
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 0
063 B000700 0.0
066 A000700 N
067 000700 N
068 A000700 N
068 B000700 Y
069 000700 N
070 A010700 Y
070 A020700 N
070 B010700 Y
070 B020700 Y
070 C010700 Y
070 C020700 N
070 D010700 Y
070 D020700 N
070 E010700 Y
070 E020700 N
070 F010700 Y
070 F020700 N
070 G010700 Y
070 G020700 N
070 H010700 Y
070 H020700 N
070 I010700 N
070 I020700 N
070 J010700 Y
070 J020700 N
070 K010700 Y
070 K020700 Y
070 L010700 Y
070 L020700 Y
070 M010700 Y
070 M020700 Y
070 N010700 N
070 N020700 N
<PAGE> PAGE 37
070 O010700 Y
070 O020700 N
070 P010700 Y
070 P020700 Y
070 Q010700 Y
070 Q020700 N
070 R010700 Y
070 R020700 N
071 A000700 562
071 B000700 298
071 C000700 1269
071 D000700 47
072 A000700 6
072 B000700 16
072 C000700 10
072 D000700 0
072 E000700 -1
072 F000700 6
072 G000700 0
072 H000700 0
072 I000700 0
072 J000700 2
072 K000700 0
072 L000700 0
072 M000700 0
072 N000700 10
072 O000700 0
072 P000700 0
072 Q000700 0
072 R000700 10
072 S000700 0
072 T000700 4
072 U000700 0
072 V000700 0
072 W000700 1
072 X000700 33
072 Y000700 18
072 Z000700 10
072AA000700 0
072BB000700 12
072CC010700 210
072CC020700 0
072DD010700 0
072DD020700 0
072EE000700 0
073 A010700 0.0000
073 A020700 0.0000
073 B000700 0.0000
073 C000700 0.0000
074 A000700 36
074 B000700 0
<PAGE> PAGE 38
074 C000700 35
074 D000700 343
074 E000700 0
074 F000700 1119
074 G000700 0
074 H000700 0
074 I000700 0
074 J000700 0
074 K000700 0
074 L000700 30
074 M000700 0
074 N000700 1563
074 O000700 43
074 P000700 0
074 Q000700 0
074 R010700 0
074 R020700 0
074 R030700 0
074 R040700 6
074 S000700 0
074 T000700 1514
074 U010700 72
074 U020700 58
074 V010700 11.67
074 V020700 11.61
074 W000700 0.0000
074 X000700 38
074 Y000700 0
075 A000700 0
075 B000700 1284
076 000700 0.00
030 A000800 0
030 B000800 0.00
030 C000800 0.00
SIGNATURE AMY J. LEE
TITLE SECRETARY
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000088498
<NAME> SECURITY INCOME FUND
<SERIES>
<NUMBER> 011
<NAME> CORPORATE BOND - A
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1998
<PERIOD-START> JAN-01-1998
<PERIOD-END> JUN-30-1998
<EXCHANGE-RATE> 1.000
<INVESTMENTS-AT-COST> 61,576
<INVESTMENTS-AT-VALUE> 63,645
<RECEIVABLES> 987
<ASSETS-OTHER> 121
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 64,753
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 143
<TOTAL-LIABILITIES> 143
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 75,252
<SHARES-COMMON-STOCK> 7,886
<SHARES-COMMON-PRIOR> 8,013
<ACCUMULATED-NII-CURRENT> 66
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (12,777)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 2,069
<NET-ASSETS> 64,610
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 2,263
<OTHER-INCOME> 0
<EXPENSES-NET> 374
<NET-INVESTMENT-INCOME> 1,889
<REALIZED-GAINS-CURRENT> 415
<APPREC-INCREASE-CURRENT> (102)
<NET-CHANGE-FROM-OPS> 2,202
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 1,652
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 710
<NUMBER-OF-SHARES-REDEEMED> 1,009
<SHARES-REINVESTED> 172
<NET-CHANGE-IN-ASSETS> (586)
<ACCUMULATED-NII-PRIOR> 22
<ACCUMULATED-GAINS-PRIOR> (13,192)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 158
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 391
<AVERAGE-NET-ASSETS> 63,688
<PER-SHARE-NAV-BEGIN> 7.05
<PER-SHARE-NII> .21
<PER-SHARE-GAIN-APPREC> .04
<PER-SHARE-DIVIDEND> .21
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.09
<EXPENSE-RATIO> 1.10
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000088498
<NAME> SECURITY INCOME FUND
<SERIES>
<NUMBER> 012
<NAME> CORPORATE BOND - B
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1998
<PERIOD-START> JAN-01-1998
<PERIOD-END> JUN-30-1998
<EXCHANGE-RATE> 1.000
<INVESTMENTS-AT-COST> 61,576
<INVESTMENTS-AT-VALUE> 63,645
<RECEIVABLES> 987
<ASSETS-OTHER> 121
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 64,753
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 143
<TOTAL-LIABILITIES> 143
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 75,252
<SHARES-COMMON-STOCK> 1,221
<SHARES-COMMON-PRIOR> 916
<ACCUMULATED-NII-CURRENT> 66
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (12,777)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (2,069)
<NET-ASSETS> 64,610
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 2,263
<OTHER-INCOME> 0
<EXPENSES-NET> 374
<NET-INVESTMENT-INCOME> 1,889
<REALIZED-GAINS-CURRENT> 415
<APPREC-INCREASE-CURRENT> (102)
<NET-CHANGE-FROM-OPS> 2,202
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 193
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 448
<NUMBER-OF-SHARES-REDEEMED> 165
<SHARES-REINVESTED> 24
<NET-CHANGE-IN-ASSETS> 2,216
<ACCUMULATED-NII-PRIOR> 22
<ACCUMULATED-GAINS-PRIOR> (13,192)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 158
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 391
<AVERAGE-NET-ASSETS> 63,688
<PER-SHARE-NAV-BEGIN> 7.09
<PER-SHARE-NII> .18
<PER-SHARE-GAIN-APPREC> .04
<PER-SHARE-DIVIDEND> (.18)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.13
<EXPENSE-RATIO> 1.85
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000088498
<NAME> SECURITY INCOME FUND
<SERIES>
<NUMBER> 021
<NAME> U.S. GOVERNMENT - A
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1998
<PERIOD-START> JAN-01-1998
<PERIOD-END> JUN-30-1998
<EXCHANGE-RATE> 1.000
<INVESTMENTS-AT-COST> 14,732
<INVESTMENTS-AT-VALUE> 15,145
<RECEIVABLES> 204
<ASSETS-OTHER> 259
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 15,608
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 26
<TOTAL-LIABILITIES> 26
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 16,115
<SHARES-COMMON-STOCK> 2,425
<SHARES-COMMON-PRIOR> 1,590
<ACCUMULATED-NII-CURRENT> 2
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (949)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 413
<NET-ASSETS> 15,581
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 336
<OTHER-INCOME> 0
<EXPENSES-NET> 55
<NET-INVESTMENT-INCOME> 281
<REALIZED-GAINS-CURRENT> 12
<APPREC-INCREASE-CURRENT> 102
<NET-CHANGE-FROM-OPS> 395
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 245
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1216
<NUMBER-OF-SHARES-REDEEMED> 426
<SHARES-REINVESTED> 45
<NET-CHANGE-IN-ASSETS> 4,128
<ACCUMULATED-NII-PRIOR> 4
<ACCUMULATED-GAINS-PRIOR> (961)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 25
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 80
<AVERAGE-NET-ASSETS> 11,518
<PER-SHARE-NAV-BEGIN> 4.81
<PER-SHARE-NII> .14
<PER-SHARE-GAIN-APPREC> .05
<PER-SHARE-DIVIDEND> (.14)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 4.86
<EXPENSE-RATIO> .85
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000088498
<NAME> SECURITY INCOME FUND
<SERIES>
<NUMBER> 022
<NAME> U.S. GOVERNMENT - B
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1998
<PERIOD-START> JAN-01-1998
<PERIOD-END> JUN-30-1998
<EXCHANGE-RATE> 1.000
<INVESTMENTS-AT-COST> 14,732
<INVESTMENTS-AT-VALUE> 15,145
<RECEIVABLES> 204
<ASSETS-OTHER> 259
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 15,608
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 26
<TOTAL-LIABILITIES> 26
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 16,115
<SHARES-COMMON-STOCK> 783
<SHARES-COMMON-PRIOR> 227
<ACCUMULATED-NII-CURRENT> 2
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (949)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 413
<NET-ASSETS> 15,581
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 336
<OTHER-INCOME> 0
<EXPENSES-NET> 55
<NET-INVESTMENT-INCOME> 281
<REALIZED-GAINS-CURRENT> 12
<APPREC-INCREASE-CURRENT> 102
<NET-CHANGE-FROM-OPS> 395
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 38
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 669
<NUMBER-OF-SHARES-REDEEMED> 120
<SHARES-REINVESTED> 7
<NET-CHANGE-IN-ASSETS> 2,711
<ACCUMULATED-NII-PRIOR> 4
<ACCUMULATED-GAINS-PRIOR> (961)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 25
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 80
<AVERAGE-NET-ASSETS> 11,518
<PER-SHARE-NAV-BEGIN> 4.80
<PER-SHARE-NII> .14
<PER-SHARE-GAIN-APPREC> .02
<PER-SHARE-DIVIDEND> .11
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 4.85
<EXPENSE-RATIO> 1.65
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<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> 6-MOS
<FISCAL-YEAR-END> DEC-31-1998
<PERIOD-START> JAN-01-1998
<PERIOD-END> JUN-30-1998
<EXCHANGE-RATE> 1.000
<INVESTMENTS-AT-COST> 6,332
<INVESTMENTS-AT-VALUE> 6,452
<RECEIVABLES> 107
<ASSETS-OTHER> 126
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 6,685
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 11
<TOTAL-LIABILITIES> 11
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 6,562
<SHARES-COMMON-STOCK> 543
<SHARES-COMMON-PRIOR> 533
<ACCUMULATED-NII-CURRENT> 2
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (10)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 120
<NET-ASSETS> 6674
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 241
<OTHER-INCOME> 0
<EXPENSES-NET> 37
<NET-INVESTMENT-INCOME> 204
<REALIZED-GAINS-CURRENT> 52
<APPREC-INCREASE-CURRENT> (33)
<NET-CHANGE-FROM-OPS> 223
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 179
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 18
<NUMBER-OF-SHARES-REDEEMED> 24
<SHARES-REINVESTED> 16
<NET-CHANGE-IN-ASSETS> (116)
<ACCUMULATED-NII-PRIOR> 4
<ACCUMULATED-GAINS-PRIOR> (63)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 16
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 55
<AVERAGE-NET-ASSETS> 6,680
<PER-SHARE-NAV-BEGIN> 10.30
<PER-SHARE-NII> .31
<PER-SHARE-GAIN-APPREC> .03
<PER-SHARE-DIVIDEND> .32
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 10.32
<EXPENSE-RATIO> 1.03
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000088498
<NAME> SECURITY INCOME FUND
<SERIES>
<NUMBER> 032
<NAME> LIMITED MATURITY BOND - B
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1998
<PERIOD-START> JAN-01-1998
<PERIOD-END> JUN-30-1998
<EXCHANGE-RATE> 1.000
<INVESTMENTS-AT-COST> 6,332
<INVESTMENTS-AT-VALUE> 6,452
<RECEIVABLES> 107
<ASSETS-OTHER> 126
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 6,685
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 11
<TOTAL-LIABILITIES> 11
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 6,562
<SHARES-COMMON-STOCK> 104
<SHARES-COMMON-PRIOR> 103
<ACCUMULATED-NII-CURRENT> 2
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (10)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 120
<NET-ASSETS> 6674
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 241
<OTHER-INCOME> 0
<EXPENSES-NET> 37
<NET-INVESTMENT-INCOME> 204
<REALIZED-GAINS-CURRENT> 52
<APPREC-INCREASE-CURRENT> (33)
<NET-CHANGE-FROM-OPS> 223
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 27
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 2
<NUMBER-OF-SHARES-REDEEMED> 4
<SHARES-REINVESTED> 3
<NET-CHANGE-IN-ASSETS> 14
<ACCUMULATED-NII-PRIOR> 4
<ACCUMULATED-GAINS-PRIOR> (63)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 16
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 55
<AVERAGE-NET-ASSETS> 6,680
<PER-SHARE-NAV-BEGIN> 10.27
<PER-SHARE-NII> .27
<PER-SHARE-GAIN-APPREC> .03
<PER-SHARE-DIVIDEND> .26
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 10.31
<EXPENSE-RATIO> 1.89
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000088498
<NAME> SECURITY INCOME FUND
<SERIES>
<NUMBER> 041
<NAME> MFR GLOBAL HIGH YIELD - A
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1998
<PERIOD-START> JAN-01-1998
<PERIOD-END> JUN-30-1998
<EXCHANGE-RATE> 1.000
<INVESTMENTS-AT-COST> 4,620
<INVESTMENTS-AT-VALUE> 4,269
<RECEIVABLES> 161
<ASSETS-OTHER> 104
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 4,534
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 20
<TOTAL-LIABILITIES> 20
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 4,616
<SHARES-COMMON-STOCK> 293
<SHARES-COMMON-PRIOR> 468
<ACCUMULATED-NII-CURRENT> 197
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 54
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (354)
<NET-ASSETS> 4,513
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 377
<OTHER-INCOME> (12)
<EXPENSES-NET> 58
<NET-INVESTMENT-INCOME> 307
<REALIZED-GAINS-CURRENT> 50
<APPREC-INCREASE-CURRENT> (183)
<NET-CHANGE-FROM-OPS> 174
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 150
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 6
<NUMBER-OF-SHARES-REDEEMED> 195
<SHARES-REINVESTED> 14
<NET-CHANGE-IN-ASSETS> (1,777)
<ACCUMULATED-NII-PRIOR> 99
<ACCUMULATED-GAINS-PRIOR> 3
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 23
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 81
<AVERAGE-NET-ASSETS> 6,075
<PER-SHARE-NAV-BEGIN> 9.94
<PER-SHARE-NII> .56
<PER-SHARE-GAIN-APPREC> (.32)
<PER-SHARE-DIVIDEND> (.40)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 9.78
<EXPENSE-RATIO> 1.70
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000088498
<NAME> SECURITY INCOME FUND
<SERIES>
<NUMBER> 042
<NAME> MFR GLOBAL HIGH YIELD - B
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1998
<PERIOD-START> JAN-01-1998
<PERIOD-END> JUN-30-1998
<EXCHANGE-RATE> 1.000
<INVESTMENTS-AT-COST> 4,620
<INVESTMENTS-AT-VALUE> 4,269
<RECEIVABLES> 161
<ASSETS-OTHER> 104
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 4,534
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 20
<TOTAL-LIABILITIES> 20
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 4,616
<SHARES-COMMON-STOCK> 167
<SHARES-COMMON-PRIOR> 162
<ACCUMULATED-NII-CURRENT> 197
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 54
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (354)
<NET-ASSETS> 4,513
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 377
<OTHER-INCOME> (12)
<EXPENSES-NET> 58
<NET-INVESTMENT-INCOME> 307
<REALIZED-GAINS-CURRENT> 50
<APPREC-INCREASE-CURRENT> (183)
<NET-CHANGE-FROM-OPS> 174
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 59
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 2
<NUMBER-OF-SHARES-REDEEMED> 3
<SHARES-REINVESTED> 6
<NET-CHANGE-IN-ASSETS> 25
<ACCUMULATED-NII-PRIOR> 99
<ACCUMULATED-GAINS-PRIOR> 3
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 23
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 81
<AVERAGE-NET-ASSETS> 6,075
<PER-SHARE-NAV-BEGIN> 9.98
<PER-SHARE-NII> .47
<PER-SHARE-GAIN-APPREC> (.27)
<PER-SHARE-DIVIDEND> (.36)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 9.82
<EXPENSE-RATIO> 2.56
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000088498
<NAME> SECURITY INCOME FUND
<SERIES>
<NUMBER> 051
<NAME> HIGH YIELD - A
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1998
<PERIOD-START> JAN-01-1998
<PERIOD-END> JUN-30-1998
<EXCHANGE-RATE> 1.000
<INVESTMENTS-AT-COST> 8,528
<INVESTMENTS-AT-VALUE> 8,687
<RECEIVABLES> 186
<ASSETS-OTHER> 103
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 8,976
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 11
<TOTAL-LIABILITIES> 11
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 8,660
<SHARES-COMMON-STOCK> 326
<SHARES-COMMON-PRIOR> 330
<ACCUMULATED-NII-CURRENT> 9
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 137
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 159
<NET-ASSETS> 8,965
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 402
<OTHER-INCOME> 0
<EXPENSES-NET> 54
<NET-INVESTMENT-INCOME> 348
<REALIZED-GAINS-CURRENT> 137
<APPREC-INCREASE-CURRENT> (115)
<NET-CHANGE-FROM-OPS> 370
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 202
<DISTRIBUTIONS-OF-GAINS> (1)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 26
<NUMBER-OF-SHARES-REDEEMED> 43
<SHARES-REINVESTED> 13
<NET-CHANGE-IN-ASSETS> (54)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 27
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 81
<AVERAGE-NET-ASSETS> 9,225
<PER-SHARE-NAV-BEGIN> 15.71
<PER-SHARE-NII> 1.27
<PER-SHARE-GAIN-APPREC> .62
<PER-SHARE-DIVIDEND> .62
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 15.74
<EXPENSE-RATIO> .78
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<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-31-1998
<PERIOD-START> JAN-01-1998
<PERIOD-END> JUN-30-1998
<EXCHANGE-RATE> 1.000
<INVESTMENTS-AT-COST> 8,528
<INVESTMENTS-AT-VALUE> 8,687
<RECEIVABLES> 186
<ASSETS-OTHER> 103
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 8,976
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 11
<TOTAL-LIABILITIES> 11
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 8,660
<SHARES-COMMON-STOCK> 244
<SHARES-COMMON-PRIOR> 283
<ACCUMULATED-NII-CURRENT> 9
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 137
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 159
<NET-ASSETS> 8,965
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 402
<OTHER-INCOME> 0
<EXPENSES-NET> 54
<NET-INVESTMENT-INCOME> 348
<REALIZED-GAINS-CURRENT> 137
<APPREC-INCREASE-CURRENT> (115)
<NET-CHANGE-FROM-OPS> 370
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 137
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 10
<NUMBER-OF-SHARES-REDEEMED> 57
<SHARES-REINVESTED> 8
<NET-CHANGE-IN-ASSETS> (592)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 27
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 81
<AVERAGE-NET-ASSETS> 9,225
<PER-SHARE-NAV-BEGIN> 15.68
<PER-SHARE-NII> 1.12
<PER-SHARE-GAIN-APPREC> (.54)
<PER-SHARE-DIVIDEND> .55
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 15.71
<EXPENSE-RATIO> 1.68
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000088498
<NAME> SECURITY INCOME FUND
<SERIES>
<NUMBER> 061
<NAME> MFR EMERGING MARKETS - A
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1998
<PERIOD-START> JAN-01-1998
<PERIOD-END> JUN-30-1998
<EXCHANGE-RATE> 1.000
<INVESTMENTS-AT-COST> 1,165
<INVESTMENTS-AT-VALUE> 1,075
<RECEIVABLES> 157
<ASSETS-OTHER> 14
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 1,246
<PAYABLE-FOR-SECURITIES> 137
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 4
<TOTAL-LIABILITIES> 141
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 1,095
<SHARES-COMMON-STOCK> 55
<SHARES-COMMON-PRIOR> 54
<ACCUMULATED-NII-CURRENT> 17
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 82
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (89)
<NET-ASSETS> 1,105
<DIVIDEND-INCOME> 7
<INTEREST-INCOME> 23
<OTHER-INCOME> 0
<EXPENSES-NET> 12
<NET-INVESTMENT-INCOME> 18
<REALIZED-GAINS-CURRENT> 86
<APPREC-INCREASE-CURRENT> (16)
<NET-CHANGE-FROM-OPS> 88
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 52
<ACCUMULATED-NII-PRIOR> (1)
<ACCUMULATED-GAINS-PRIOR> (4)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 5
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 33
<AVERAGE-NET-ASSETS> 1,072
<PER-SHARE-NAV-BEGIN> 9.25
<PER-SHARE-NII> .19
<PER-SHARE-GAIN-APPREC> .65
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 10.09
<EXPENSE-RATIO> 1.99
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000088498
<NAME> SECURITY INCOME FUND
<SERIES>
<NUMBER> 062
<NAME> MFR EMERGING MARKETS - B
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1998
<PERIOD-START> JAN-01-1998
<PERIOD-END> JUN-30-1998
<EXCHANGE-RATE> 1.000
<INVESTMENTS-AT-COST> 1,165
<INVESTMENTS-AT-VALUE> 1,075
<RECEIVABLES> 157
<ASSETS-OTHER> 14
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 1,246
<PAYABLE-FOR-SECURITIES> 137
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 4
<TOTAL-LIABILITIES> 141
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 1,095
<SHARES-COMMON-STOCK> 55
<SHARES-COMMON-PRIOR> 54
<ACCUMULATED-NII-CURRENT> 17
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 82
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (89)
<NET-ASSETS> 1,105
<DIVIDEND-INCOME> 7
<INTEREST-INCOME> 23
<OTHER-INCOME> 0
<EXPENSES-NET> 12
<NET-INVESTMENT-INCOME> 18
<REALIZED-GAINS-CURRENT> 86
<APPREC-INCREASE-CURRENT> (16)
<NET-CHANGE-FROM-OPS> 88
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 58
<ACCUMULATED-NII-PRIOR> (1)
<ACCUMULATED-GAINS-PRIOR> (4)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 5
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 33
<AVERAGE-NET-ASSETS> 1,072
<PER-SHARE-NAV-BEGIN> 9.25
<PER-SHARE-NII> .15
<PER-SHARE-GAIN-APPREC> .65
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 10.25
<EXPENSE-RATIO> 2.75
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000088498
<NAME> SECURITY INCOME FUND
<SERIES>
<NUMBER> 071
<NAME> MFR GLOBAL ASSET ALLOCATION - A
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1998
<PERIOD-START> JAN-01-1998
<PERIOD-END> JUN-30-1998
<EXCHANGE-RATE> 1.000
<INVESTMENTS-AT-COST> 1,312
<INVESTMENTS-AT-VALUE> 1,497
<RECEIVABLES> 16
<ASSETS-OTHER> 50
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 1,563
<PAYABLE-FOR-SECURITIES> 43
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 6
<TOTAL-LIABILITIES> 49
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 1,327
<SHARES-COMMON-STOCK> 72
<SHARES-COMMON-PRIOR> 58
<ACCUMULATED-NII-CURRENT> 11
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (10)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 186
<NET-ASSETS> 1,514
<DIVIDEND-INCOME> 10
<INTEREST-INCOME> 15
<OTHER-INCOME> (1)
<EXPENSES-NET> 14
<NET-INVESTMENT-INCOME> 10
<REALIZED-GAINS-CURRENT> (12)
<APPREC-INCREASE-CURRENT> 210
<NET-CHANGE-FROM-OPS> 208
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 15
<NUMBER-OF-SHARES-REDEEMED> 1
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 270
<ACCUMULATED-NII-PRIOR> 1
<ACCUMULATED-GAINS-PRIOR> 2
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 6
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 33
<AVERAGE-NET-ASSETS> 1,284
<PER-SHARE-NAV-BEGIN> 9.82
<PER-SHARE-NII> .10
<PER-SHARE-GAIN-APPREC> 1.75
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 11.67
<EXPENSE-RATIO> 1.84
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000088498
<NAME> SECURITY INCOME FUND
<SERIES>
<NUMBER> 072
<NAME> MFR GLOBAL ASSET ALLOCATION - B
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1998
<PERIOD-START> JAN-01-1998
<PERIOD-END> JUN-30-1998
<EXCHANGE-RATE> 1.000
<INVESTMENTS-AT-COST> 1,312
<INVESTMENTS-AT-VALUE> 1,497
<RECEIVABLES> 16
<ASSETS-OTHER> 50
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 1,563
<PAYABLE-FOR-SECURITIES> 43
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 6
<TOTAL-LIABILITIES> 49
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 1,327
<SHARES-COMMON-STOCK> 58
<SHARES-COMMON-PRIOR> 52
<ACCUMULATED-NII-CURRENT> 11
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 0
<OVERDISTRIBUTION-GAINS> (10)
<ACCUM-APPREC-OR-DEPREC> 186
<NET-ASSETS> 1,514
<DIVIDEND-INCOME> 10
<INTEREST-INCOME> 15
<OTHER-INCOME> (1)
<EXPENSES-NET> 14
<NET-INVESTMENT-INCOME> 10
<REALIZED-GAINS-CURRENT> (12)
<APPREC-INCREASE-CURRENT> 210
<NET-CHANGE-FROM-OPS> 208
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 6
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> 164
<ACCUMULATED-NII-PRIOR> 1
<ACCUMULATED-GAINS-PRIOR> 2
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 6
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 33
<AVERAGE-NET-ASSETS> 1,284
<PER-SHARE-NAV-BEGIN> 9.82
<PER-SHARE-NII> .06
<PER-SHARE-GAIN-APPREC> 1.73
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 11.61
<EXPENSE-RATIO> 2.75
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>