PAGE 1
000 B000000 10/31/2017
000 C000000 0001379384
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 6.1
000 J000000 A
001 A000000 BLK CREDIT ALLOCATION INCOME TRUST
001 B000000 811-21972
001 C000000 8004417762
002 A000000 100 BELLEVUE PARKWAY
002 B000000 WILMINGTON
002 C000000 DE
002 D010000 19809
003 000000 N
004 000000 N
005 000000 N
006 000000 N
007 A000000 N
007 B000000 0
007 C010100 1
008 A000001 BLACKROCK ADVISORS, LLC
008 B000001 A
008 C000001 801-47710
008 D010001 WILMINGTON
008 D020001 DE
008 D030001 19809
012 A000001 COMPUTERSHARE TRUST COMPANY, N.A.
012 B000001 85-11340
012 C010001 CANTON
012 C020001 MA
012 C030001 02021
013 A000001 DELOITTE & TOUCHE LLP
013 B010001 BOSTON
013 B020001 MA
013 B030001 02116
014 A000001 BLACKROCK EXECUTION SERVICES
014 B000001 8-48719
014 A000002 BLACKROCK INVESTMENTS, LLC
014 B000002 8-48436
014 A000003 HARRIS WILLIAMS LLC
014 B000003 8-53380
014 A000004 PNC CAPITAL MARKETS, INC.
014 B000004 8-32493
014 A000005 PNC INVESTMENTS LLC
014 B000005 8-66195
014 A000006 SOLEBURY CAPITAL, LLC
014 B000006 8-67548
015 A000001 STATE STREET BANK & TRUST COMPANY
PAGE 2
015 B000001 C
015 C010001 BOSTON
015 C020001 MA
015 C030001 02111
015 E010001 X
015 A000002 CLEARSTREAM BANKING SA
015 B000002 S
015 C010002 LUXEMBOURG
015 D010002 LUXEMBOURG
015 E040002 X
018 000000 Y
019 A000000 Y
019 B000000 274
019 C000000 BLKRKADVSR
020 A000001 BANK OF AMERICA CORP
020 B000001 56-0906609
020 C000001 31
021 000000 40
022 A000001 RBC CAPITAL MARKETS CORP
022 B000001 13-5033225
022 C000001 578285
022 D000001 574219
022 A000002 REGIONS BANK
022 B000002 63-0371391
022 C000002 610525
022 D000002 518515
022 A000003 BLK LIQUIDITY FUNDS, T-FUND, INST. CLASS
022 B000003 52-0983343
022 C000003 448248
022 D000003 448980
022 A000004 DEUTSCHE BANK SECURITIES, INC.
022 B000004 13-2730828
022 C000004 356873
022 D000004 358743
022 A000005 BARCLAYS CAPITAL INC.
022 B000005 13-3299429
022 C000005 283600
022 D000005 217691
022 A000006 CREDIT SUISSE SECURITIES (USA) LLC
022 B000006 13-5659485
022 C000006 104624
022 D000006 123271
022 A000007 CITIGROUPGLOBAL MARKETS, INC.
022 B000007 11-2418191
022 C000007 125414
022 D000007 90032
022 A000008 J.P. MORGAN SECURITIES
022 B000008 90-0129817
022 C000008 108697
022 D000008 105973
022 A000009 JEFFERIES & COMPANY INC
PAGE 3
022 B000009 95-2622900
022 C000009 28559
022 D000009 53081
022 A000010 UBS SECURITIES LLC
022 B000010 13-3873456
022 C000010 47615
022 D000010 33920
023 C000000 2857417
023 D000000 2612266
024 000000 Y
025 A000001 BANK OF AMERICA CORP
025 B000001 56-0906609
025 C000001 D
025 D000001 36326
025 A000002 J.P. MORGAN SECURITIES
025 B000002 90-0129817
025 C000002 D
025 D000002 32442
025 A000003 CREDIT SUISSE SECURITIES (USA) LLC
025 B000003 13-5659485
025 C000003 D
025 D000003 23876
025 A000004 CITIGROUP GLOBAL MARKETS INC.
025 B000004 11-2418191
025 C000004 D
025 D000004 15682
025 A000005 CITIGROUP GLOBAL MARKETS INC.
025 B000005 11-2418191
025 C000005 E
025 D000005 14108
025 A000006 BARCLAYS CAPITAL INC.
025 B000006 13-3299429
025 C000006 D
025 D000006 12907
025 A000007 JEFFERIES & COMPANY, INC.
025 B000007 95-2622990
025 C000007 D
025 D000007 1760
026 A000000 N
026 B000000 N
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
PAGE 4
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
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 0.620
048 A010000 0
PAGE 5
048 A020000 0.000
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 0
048 K020000 0.000
049 000000 N
050 000000 N
051 000000 N
052 000000 N
053 A000000 Y
053 B000000 Y
053 C000000 N
054 A000000 Y
054 B000000 Y
054 C000000 N
054 D000000 N
054 E000000 N
054 F000000 N
054 G000000 N
054 H000000 Y
054 I000000 N
054 J000000 Y
054 K000000 N
054 L000000 N
054 M000000 Y
054 N000000 N
055 A000000 Y
055 B000000 N
056 000000 Y
057 000000 N
058 A000000 N
059 000000 Y
060 A000000 Y
060 B000000 Y
061 000000 0
PAGE 6
062 A000000 Y
062 B000000 0.0
062 C000000 0.2
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 0.1
062 L000000 0.6
062 M000000 1.5
062 N000000 0.0
062 O000000 1.1
062 P000000 93.3
062 Q000000 28.7
062 R000000 4.0
063 A000000 0
063 B000000 19.9
064 A000000 N
064 B000000 Y
065 000000 N
066 A000000 N
067 000000 N
068 A000000 N
068 B000000 N
069 000000 N
070 A010000 Y
070 A020000 N
070 B010000 Y
070 B020000 N
070 C010000 Y
070 C020000 N
070 D010000 Y
070 D020000 N
070 E010000 Y
070 E020000 Y
070 F010000 Y
070 F020000 N
070 G010000 Y
070 G020000 Y
070 H010000 Y
070 H020000 N
070 I010000 N
070 I020000 N
070 J010000 Y
070 J020000 Y
070 K010000 Y
070 K020000 Y
070 L010000 Y
PAGE 7
070 L020000 Y
070 M010000 Y
070 M020000 N
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 Y
070 R020000 N
071 A000000 496888
071 B000000 644268
071 C000000 2026019
071 D000000 25
072 A000000 12
072 B000000 101229
072 C000000 4861
072 D000000 0
072 E000000 0
072 F000000 12704
072 G000000 123
072 H000000 0
072 I000000 149
072 J000000 109
072 K000000 0
072 L000000 36
072 M000000 285
072 N000000 42
072 O000000 0
072 P000000 5584
072 Q000000 0
072 R000000 67
072 S000000 104
072 T000000 0
072 U000000 0
072 V000000 0
072 W000000 67
072 X000000 19270
072 Y000000 12
072 Z000000 86832
072AA000000 7925
072BB000000 0
072CC010000 23622
072CC020000 0
072DD010000 90693
072DD020000 0
072EE000000 0
073 A010000 0.8425
PAGE 8
073 A020000 0.0000
073 B000000 0.0000
073 C000000 0.0000
074 A000000 2765
074 B000000 0
074 C000000 0
074 D000000 1996036
074 E000000 63334
074 F000000 0
074 G000000 820
074 H000000 0
074 I000000 9515
074 J000000 1175
074 K000000 7
074 L000000 24990
074 M000000 168
074 N000000 2098810
074 O000000 18332
074 P000000 1078
074 Q000000 0
074 R010000 477822
074 R020000 0
074 R030000 0
074 R040000 3544
074 S000000 0
074 T000000 1598034
074 U010000 107412
074 U020000 0
074 V010000 14.88
074 V020000 0.00
074 W000000 0.0000
074 X000000 55419
074 Y000000 325691
075 A000000 0
075 B000000 1573911
076 000000 13.36
077 A000000 Y
077 B000000 Y
077 O000000 Y
077 Q010000 N
078 000000 N
080 A000000 Federal Insurance Company
080 B000000 St. Paul Fire & Marine Ins. Co.
080 C000000 60650
081 A000000 Y
081 B000000 74
082 A000000 N
082 B000000 0
083 A000000 N
083 B000000 0
084 A000000 N
PAGE 9
084 B000000 0
085 A000000 Y
085 B000000 N
086 A010000 0
086 A020000 0
086 B010000 676
086 B020000 8823
086 C010000 0
086 C020000 0
086 D010000 0
086 D020000 0
086 E010000 0
086 E020000 0
086 F010000 0
086 F020000 0
087 A010000 Common Stock
087 A020000 092508100
087 A030000 BTZ
088 A000000 N
088 B000000 N
088 C000000 N
088 D000000 N
SIGNATURE NEAL J. ANDREWS
TITLE CFO