PAGE 1
000 B000000 09/30/2017
000 C000000 0000093284
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 6.1
000 J000000 A
001 A000000 MORGAN STANLEY INCOME SECURITIES INC.
001 B000000 811-02349
001 C000000 8002312608
002 A000000 522 FIFTH AVENUE
002 B000000 NEW YORK
002 C000000 NY
002 D010000 10036
003 000000 N
004 000000 N
005 000000 N
006 000000 N
007 A000000 N
007 B000000 0
007 C010100 1
008 A000001 MORGAN STANLEY INVESTMENT MANAGEMENT INC.
008 B000001 A
008 C000001 801-15757
008 D010001 NEW YORK
008 D020001 NY
008 D030001 10036
010 A000001 MORGAN STANLEY INVESTMENT MANAGEMENT INC.
010 B000001 801-15757
010 C010001 NEW YORK
010 C020001 NY
010 C030001 10036
012 A000001 COMPUTERSHARE TRUST COMPANY, N.A.
012 B000001 85-05003
012 C010001 COLLEGE STATION
012 C020001 TX
012 C030001 77845
013 A000001 ERNST & YOUNG LLP
013 B010001 BOSTON
013 B020001 MA
013 B030001 02116
014 A000001 BTMU CAPITAL CORPORATION
014 B000001 8-00000
014 A000002 BTMU LEASING & FINANCE
014 B000002 8-00000
014 A000003 BANK OF TOKYO - MITSUBISHI UFJ LTD.
014 B000003 8-00000
014 A000004 BETTER ALTERNATIVE TRADING SYSTEM (BATS)
014 B000004 8-00000
PAGE 2
014 A000005 BLOCK INTEREST DISCOVERY SERVICE (BIDS)
014 B000005 8-00000
014 A000006 KABU.COM SECURITIES
014 B000006 8-00000
014 A000007 MITSUBISHI UFJ MORGAN STANLEY SECURITIES CO.
014 B000007 8-00000
014 A000008 MITSUBISHI UFJ TRUST & BANKING CORP.
014 B000008 8-00000
014 A000009 MORGAN STANLEY & CO. LLC
014 B000009 8-15869
014 A000010 MORGAN STANLEY & CO. INTERNATIONAL PLC
014 B000010 8-00000
014 A000011 MORGAN STANLEY AUSTRALIA SECURITIES LIMITED
014 B000011 8-00000
014 A000012 MORGAN STANLEY ASIA INTERNATIONAL LIMITED
014 B000012 8-00000
014 A000013 MORGAN STANLEY ASIA (SINGAPORE) PTE
014 B000013 8-00000
014 A000014 MORGAN STANLEY ASIA (SINGAPORE) SECURITIES PT
014 B000014 8-00000
014 A000015 MORGAN STANLEY CANADA LIMITED
014 B000015 8-00000
014 A000016 MORGAN STANLEY CAPITAL SERVICES LLC
014 B000016 8-00000
014 A000017 MORGAN STANLEY C.T.V.M. S.A.
014 B000017 8-00000
014 A000018 MORGAN STANLEY DISTRIBUTION, INC.
014 B000018 8-44766
014 A000019 MORGAN STANLEY GATEWAY SECURITIES JSC
014 B000019 8-00000
014 A000020 MORGAN STANLEY HONG KONG SECURITIES LIMITED
014 B000020 8-00000
014 A000021 MORGAN STANLEY INDIA COMPANY PRIVATE LTD.
014 B000021 8-00000
014 A000022 MORGAN STANLEY MENKUL DEGERLER A.S.
014 B000022 8-00000
014 A000023 MORGAN STANLEY MEXICO, CASA DE BOLSA, SA DE C
014 B000023 8-00000
014 A000024 MORGAN STANLEY MUFG SECURITIES CO., LTD.
014 B000024 8-00000
014 A000025 MORGAN STANLEY SAUDI ARABIA
014 B000025 8-00000
014 A000026 MORGAN STANLEY SMITH BARNEY LLC
014 B000026 8-68191
014 A000027 MORGAN STANLEY TAIWAN LIMITED
014 B000027 8-00000
014 A000028 MORGAN STANLEY WEALTH MANAGEMENT AUSTRAILIA P
014 B000028 8-00000
014 A000029 MORGAN STANLEY, S.V. S.A.
014 B000029 8-00000
014 A000030 MUFG SECURITIES ASIA (SINGAPORE) LIMITED
PAGE 3
014 B000030 8-00000
014 A000031 MUFG SECURITIES AMERICAS INC.
014 B000031 8-00000
014 A000032 MUFG SECURITIES ASIA LIMITED
014 B000032 8-00000
014 A000033 MUFG SECURITIES EMEA PLC
014 B000033 8-00000
014 A000034 MUNICENTER
014 B000034 8-00000
014 A000035 OOO MORGAN STANLEY BANK
014 B000035 8-00000
014 A000036 PRIME DEALER SERVICES CORP.
014 B000036 8-47025
014 A000037 PT. MORGAN STANLEY ASIA INDONESIA
014 B000037 8-00000
014 A000038 RMB MORGAN STANLEY
014 B000038 8-00000
014 A000039 TOKYO CREDIT SERVICES
014 B000039 8-00000
014 A000040 TRADEWEB
014 B000040 8-00000
014 A000041 UNION BANC INVESTMENT SERVICES
014 B000041 8-30706
014 A000042 UNIONBANCAL CORPORATION
014 B000042 8-00000
015 A000001 STATE STREET BANK AND TRUST COMPANY
015 B000001 C
015 C010001 BOSTON
015 C020001 MA
015 C030001 02111
015 E010001 X
018 000000 Y
019 A000000 Y
019 B000000 80
019 C000000 MSINSTLRET
020 A000001 GOLDMAN SACHS & CO.
020 B000001 13-5108880
020 C000001 7
021 000000 7
022 A000001 MORGAN STANLEY
022 B000001 13-2655998
022 C000001 26797
022 D000001 26606
022 A000002 CITIGROUP GLOBAL MARKETS, INC.
022 B000002 11-2418191
022 C000002 14807
022 D000002 6893
022 A000003 BANK OF AMERICA CORP.
022 B000003 56-0906609
022 C000003 12205
022 D000003 9150
PAGE 4
022 A000004 GOLDMAN SACHS & CO.
022 B000004 13-5108880
022 C000004 9171
022 D000004 8667
022 A000005 JP MORGAN CHASE & CO.
022 B000005 13-2624428
022 C000005 10260
022 D000005 6924
022 A000006 CREDIT SUISSE
022 B000006 13-5659485
022 C000006 4119
022 D000006 5534
022 A000007 BARCLAYS BANK PLC
022 B000007 13-4942190
022 C000007 3828
022 D000007 4214
022 A000008 WELLS FARGO BANK
022 B000008 94-1347393
022 C000008 3292
022 D000008 3275
022 A000009 DEUTSCHE BANK AG
022 B000009 13-2944988
022 C000009 4481
022 D000009 1295
022 A000010 JEFFERIES & CO., INC.
022 B000010 95-2622900
022 C000010 2448
022 D000010 2092
023 C000000 101981
023 D000000 93528
024 000000 Y
025 A000001 JP MORGAN CHASE & CO.
025 B000001 13-2624428
025 C000001 D
025 D000001 2142
025 A000002 BANK OF AMERICA CORP.
025 B000002 56-0906609
025 C000002 D
025 D000002 6100
025 A000003 GOLDMAN SACHS & CO.
025 B000003 13-5108880
025 C000003 D
025 D000003 2369
025 A000004 CITIGROUP GLOBAL MARKETS, INC.
025 B000004 11-2418191
025 C000004 D
025 D000004 4177
025 A000005 CREDIT SUISSE
025 B000005 13-5659485
025 C000005 D
025 D000005 2005
PAGE 5
025 A000006 WELLS FARGO BANK
025 B000006 94-1347393
025 C000006 D
025 D000006 947
025 A000007 DEUTSCHE BANK AG
025 B000007 13-2944988
025 C000007 D
025 D000007 779
026 A000000 N
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 N
028 A010000 0
028 A020000 0
028 A030000 0
028 A040000 0
028 B010000 0
028 B020000 0
028 B030000 0
028 B040000 0
028 C010000 0
028 C020000 0
028 C030000 0
028 C040000 0
028 D010000 0
028 D020000 0
028 D030000 0
028 D040000 0
028 E010000 0
028 E020000 0
028 E030000 0
028 E040000 0
028 F010000 0
028 F020000 0
028 F030000 0
028 F040000 0
028 G010000 0
028 G020000 0
028 G030000 0
028 G040000 0
028 H000000 0
030 A000000 0
030 B000000 0.00
030 C000000 0.00
031 A000000 0
PAGE 6
031 B000000 0
032 000000 0
033 000000 0
035 000000 0
036 B000000 0
038 000000 0
042 A000000 0
042 B000000 0
042 C000000 0
042 D000000 0
042 E000000 0
042 F000000 0
042 G000000 0
042 H000000 0
043 000000 0
044 000000 0
045 000000 Y
046 000000 N
047 000000 Y
048 000000 0.000
048 A010000 500000
048 A020000 0.420
048 B010000 0
048 B020000 0.000
048 C010000 0
048 C020000 0.000
048 D010000 0
048 D020000 0.000
048 E010000 0
048 E020000 0.000
048 F010000 0
048 F020000 0.000
048 G010000 0
048 G020000 0.000
048 H010000 0
048 H020000 0.000
048 I010000 0
048 I020000 0.000
048 J010000 0
048 J020000 0.000
048 K010000 500000
048 K020000 0.350
049 000000 N
050 000000 N
051 000000 N
052 000000 N
053 A000000 N
054 A000000 Y
054 B000000 Y
054 C000000 Y
054 D000000 N
PAGE 7
054 E000000 N
054 F000000 N
054 G000000 Y
054 H000000 N
054 I000000 N
054 J000000 Y
054 K000000 N
054 L000000 N
054 M000000 Y
054 N000000 N
054 O000000 Y
055 A000000 N
055 B000000 N
056 000000 Y
057 000000 N
058 A000000 N
059 000000 Y
060 A000000 Y
060 B000000 Y
061 000000 0
062 A000000 Y
062 B000000 0.9
062 C000000 0.0
062 D000000 0.0
062 E000000 0.0
062 F000000 0.0
062 G000000 0.0
062 H000000 0.0
062 I000000 0.0
062 J000000 0.0
062 K000000 0.0
062 L000000 0.0
062 M000000 0.0
062 N000000 0.0
062 O000000 0.0
062 P000000 96.6
062 Q000000 1.1
062 R000000 0.0
063 A000000 0
063 B000000 11.2
064 A000000 N
064 B000000 N
066 A000000 N
067 000000 N
068 A000000 N
068 B000000 N
069 000000 N
070 A010000 Y
070 A020000 N
070 B010000 N
070 B020000 N
PAGE 8
070 C010000 Y
070 C020000 N
070 D010000 N
070 D020000 N
070 E010000 Y
070 E020000 Y
070 F010000 N
070 F020000 N
070 G010000 Y
070 G020000 N
070 H010000 N
070 H020000 N
070 I010000 N
070 I020000 N
070 J010000 Y
070 J020000 N
070 K010000 N
070 K020000 N
070 L010000 Y
070 L020000 Y
070 M010000 Y
070 M020000 Y
070 N010000 Y
070 N020000 N
070 O010000 Y
070 O020000 N
070 P010000 Y
070 P020000 N
070 Q010000 N
070 Q020000 N
070 R010000 N
070 R020000 N
071 A000000 71821
071 B000000 72621
071 C000000 167791
071 D000000 43
072 A000000 12
072 B000000 6882
072 C000000 0
072 D000000 0
072 E000000 0
072 F000000 725
072 G000000 138
072 H000000 0
072 I000000 24
072 J000000 22
072 K000000 0
072 L000000 46
072 M000000 6
072 N000000 0
072 O000000 0
PAGE 9
072 P000000 0
072 Q000000 0
072 R000000 61
072 S000000 52
072 T000000 0
072 U000000 0
072 V000000 0
072 W000000 266
072 X000000 1340
072 Y000000 0
072 Z000000 5542
072AA000000 2901
072BB000000 0
072CC010000 0
072CC020000 3642
072DD010000 0
072DD020000 0
072EE000000 0
073 A010000 0.7336
073 A020000 0.0000
073 B000000 0.0000
073 C000000 0.0000
074 A000000 526
074 B000000 0
074 C000000 1495
074 D000000 171148
074 E000000 0
074 F000000 0
074 G000000 0
074 H000000 0
074 I000000 0
074 J000000 1059
074 K000000 0
074 L000000 1666
074 M000000 113
074 N000000 176007
074 O000000 704
074 P000000 72
074 Q000000 0
074 R010000 0
074 R020000 0
074 R030000 0
074 R040000 156
074 S000000 0
074 T000000 175075
074 U010000 8963
074 U020000 0
074 V010000 19.53
074 V020000 0.00
074 W000000 0.0000
074 X000000 1820
PAGE 10
074 Y000000 0
075 A000000 0
075 B000000 172650
076 000000 18.30
077 A000000 Y
077 B000000 Y
077 C000000 N
077 D000000 N
077 E000000 N
077 F000000 N
077 G000000 N
077 H000000 N
077 I000000 N
077 J000000 N
077 K000000 N
077 L000000 N
077 M000000 N
077 N000000 N
077 O000000 Y
077 P000000 N
077 Q010000 N
077 Q020000 N
077 Q030000 N
078 000000 N
080 A000000 ICI MUTUAL INSURANCE COMPANY
080 C000000 61000
081 A000000 Y
081 B000000 79
082 A000000 N
082 B000000 0
083 A000000 N
083 B000000 0
084 A000000 N
084 B000000 0
085 A000000 Y
085 B000000 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
088 A000000 N
088 B000000 N
088 C000000 N
PAGE 11
088 D000000 N
SIGNATURE MARTA CASTILLO-VAVAL
TITLE DIRECTOR