MFS VARIABLE INSURANCE TRUST
NSAR-B, 1998-02-27
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<PAGE>      PAGE  1
000 B000000 12/31/97
000 C000000 0000918571
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 NFS VARIABLE INSURANCE TRUST
001 B000000 811-8326
001 C000000 6179545000
002 A000000 500 BOYLSTON STREET
002 B000000 BOSTON
002 C000000 MA
002 D010000 02116
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 Y
007 B000000 12
007 C010100  1
007 C020100 MFS WORLD GOVERNMENTS SERIES
007 C030100 N
007 C010200  2
007 C020200 MFS TOTAL RETURN SERIES
007 C030200 N
007 C010300  3
007 C020300 MFS UTILITIES SERIES
007 C030300 N
007 C010400  4
007 C020400 MFS MONEY MARKET SERIES
007 C030400 N
007 C010500  5
007 C020500 MFS GROWTH WITH INCOME SERIES
007 C030500 N
007 C010600  6
007 C020600 MFS VALUE SERIES
007 C030600 N
007 C010700  7
007 C020700 MFS EMERGING GROWTH SERIES
007 C030700 N
007 C010800  8
007 C020800 MFS LIMITED MATURITY SERIES
007 C030800 N
007 C010900  9
007 C020900 MFS BOND SERIES
007 C030900 N
007 C011000 10
007 C021000 MFS FOREIGN & COLONIAL EMERGING MARKETS EQUIT
<PAGE>      PAGE  2
007 C031000 N
007 C011100 11
007 C021100 MFS HIGH INCOME SERIES
007 C031100 N
007 C011200 12
007 C021200 MFS RESEARCH SERIES
007 C031200 N
007 C011300 13
007 C011400 14
007 C011500 15
007 C011600 16
007 C011700 17
007 C011800 18
007 C011900 19
007 C012000 20
008 A00AA01 MASSACHUSETTS FINANCIAL SERVICES COMPANY
008 B00AA01 A
008 C00AA01 801-17352
008 D01AA01 BOSTON
008 D02AA01 MA
008 D03AA01 02116
010 A00AA01 MASSACHUSETTS FINANCIAL SERVICES COMPANY
010 B00AA01 801-17352
010 C01AA01 BOSTON
010 C02AA01 MA
010 C03AA01 02116
011 A00AA01 MFS FUNDS DISTRIBUTORS, INC.
011 B00AA01 8-27864
011 C01AA01 BOSTON
011 C02AA01 MA
011 C03AA01 02116
012 A00AA01 MFS SERVICE CENTER, INC.
012 B00AA01 84-1316
012 C01AA01 BOSTON
012 C02AA01 MA
012 C03AA01 02116
013 A00AA01 DELOITTE & TOUCHE LLP
013 B01AA01 BOSTON
013 B02AA01 MA
013 B03AA01 02110
015 A00AA01 STATE STREET BANK AND TRUST COMPANY
015 B00AA01 C
015 C01AA01 BOSTON
015 C02AA01 MA
015 C03AA01 02111
015 E01AA01 X
015 A00AA02 BANK OF NEW YORK
015 B00AA02 S
015 C01AA02 NEW YORK
015 C02AA02 NY
015 C03AA02 10286
<PAGE>      PAGE  3
015 E01AA02 X
015 A00AA03 CHASE MANHATTAN BANK, N.A.
015 B00AA03 S
015 C01AA03 NEW YORK
015 C02AA03 NY
015 C03AA03 10081
015 E04AA03 X
018  00AA00 Y
019 A00AA00 N
019 B00AA00    0
020 A000001 MERRILL LYNCH PIERCE FENNER &CO
020 B000001 13-5674085
020 C000001    109
020 A000002 MORGAN STANLEYFORD) & CO.
020 B000002 13-2655998
020 C000002     84
020 A000003 SMITH BARNEY
020 B000003 13-1912900
020 C000003     48
020 A000004 PERSHING DIVISION OF DLJ
020 B000004 00-0000000
020 C000004     43
020 A000005 WEEDEN & CO
020 B000005 00-0000000
020 C000005     43
020 A000006 BERNSTEIN (SANFORD) & CO.
020 B000006 13-2625874
020 C000006     39
020 A000007 GOLDMAN SACHS
020 B000007 13-5108880
020 C000007     38
020 A000008 EDWARDS (AG) & SONS
020 B000008 00-0000000
020 C000008     37
020 A000009 BEAR STERNS & CO
020 B000009 13-3299429
020 C000009     36
020 A000010 PAINE WEBBER
020 B000010 00-0000000
020 C000010     35
021  000000     1298
022 A000001 LEHMAN BROTHERS
022 B000001 13-2518466
022 C000001   1134581
022 D000001     87951
022 A000002 PRUDENTIAL BACHE
022 B000002 22-2347336
022 C000002    718538
022 D000002      1205
022 A000003 CARROL MCENTEES
022 B000003 00-0000000
<PAGE>      PAGE  4
022 C000003    625626
022 D000003     30475
022 A000004 NATIONS BANK
022 B000004 75-0520130
022 C000004    642016
022 D000004      1299
022 A000005 GOLDMAN SACHS
022 B000005 13-5108880
022 C000005    546493
022 D000005     39760
022 A000006 CS FIRST BOSTON
022 B000006 00-0000000
022 C000006    525349
022 D000006     40119
022 A000007 MERRILL LYNCH
022 B000007 13-5674085
022 C000007    185385
022 D000007     58548
022 A000008 CHASE MANHATTAN
022 B000008 00-0000000
022 C000008    188030
022 D000008     13327
022 A000009 HSBC SECURITIES
022 B000009 00-0000000
022 C000009    134379
022 D000009     28012
022 A000010 BANK OF AMERICA
022 B000010 00-0000000
022 C000010    124667
022 D000010      4595
023 C000000    5640672
023 D000000     742385
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 Y
029  00AA00 N
030 A00AA00      0
030 B00AA00  0.00
030 C00AA00  0.00
031 A00AA00      0
031 B00AA00      0
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033  00AA00      0
034  00AA00 N
<PAGE>      PAGE  5
035  00AA00      0
036 B00AA00      0
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038  00AA00      0
039  00AA00 N
040  00AA00 N
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043  00AA00      0
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054 A00AA00 Y
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054 O00AA00 N
077 A000000 Y
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078  000000 N
080 A00AA00 NATIONAL UNION INSURANCE CO.
080 B00AA00 FEDERAL INS.
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081 B00AA00 116
082 A00AA00 Y
082 B00AA00      100
083 A00AA00 N
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<PAGE>      PAGE  6
086 A010000      0
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<PAGE>      PAGE  7
048 C020100 0.000
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048 K020100 0.000
049  000100 N
050  000100 N
051  000100 N
052  000100 N
053 A000100 Y
053 B000100 Y
053 C000100 Y
055 A000100 Y
055 B000100 N
056  000100 Y
057  000100 N
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059  000100 Y
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<PAGE>      PAGE  8
063 A000100   0
063 B000100  5.2
064 A000100 N
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066 A000100 N
067  000100 N
068 A000100 N
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069  000100 N
070 A010100 Y
070 A020100 N
070 B010100 Y
070 B020100 N
070 C010100 Y
070 C020100 N
070 D010100 N
070 D020100 N
070 E010100 Y
070 E020100 N
070 F010100 N
070 F020100 N
070 G010100 Y
070 G020100 N
070 H010100 N
070 H020100 N
070 I010100 N
070 I020100 N
070 J010100 Y
070 J020100 N
070 K010100 Y
070 K020100 N
070 L010100 Y
070 L020100 Y
070 M010100 Y
070 M020100 Y
070 N010100 Y
070 N020100 N
070 O010100 Y
070 O020100 N
070 P010100 Y
070 P020100 N
070 Q010100 N
070 Q020100 N
070 R010100 N
070 R020100 N
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<PAGE>      PAGE  9
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073 A010100   0.1700
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074 C000100     1700
074 D000100    35449
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074 P000100        1
<PAGE>      PAGE  10
074 Q000100        0
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024  000200 Y
025 A000201 CHASE MANHATTAN, INC.
025 B000201 13-3439358
025 C000201 E
025 D000201     248
025 A000202 MERRILL LYNCH
025 B000202 13-5674085
025 C000202 E
025 D000202     139
025 A000203 MORGAN STANLEY
025 B000203 13-2655998
025 C000203 E
025 D000203     290
025 A000204 NATIONS BANK CORP.
025 B000204 75-0520130
025 C000204 E
025 D000204     443
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025 D000206       0
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028 A010200       234
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<PAGE>      PAGE  11
028 D020200         0
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045  000200 Y
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047  000200 Y
048  000200  7.500
048 A010200        0
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048 B010200        0
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048 I020200 0.000
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049  000200 N
050  000200 N
051  000200 N
052  000200 N
053 A000200 Y
053 B000200 Y
053 C000200 Y
055 A000200 Y
055 B000200 N
<PAGE>      PAGE  12
056  000200 Y
057  000200 N
058 A000200 N
059  000200 Y
060 A000200 Y
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066 A000200 Y
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066 D000200 N
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<PAGE>      PAGE  13
070 G020200 N
070 H010200 N
070 H020200 N
070 I010200 N
070 I020200 N
070 J010200 Y
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070 K010200 Y
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<PAGE>      PAGE  14
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<PAGE>      PAGE  15
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<PAGE>      PAGE  16
049  000300 N
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<PAGE>      PAGE  17
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<PAGE>      PAGE  18
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<PAGE>      PAGE  19
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<PAGE>      PAGE  20
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<PAGE>      PAGE  21
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<PAGE>      PAGE  22
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<PAGE>      PAGE  23
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<PAGE>      PAGE  24
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<PAGE>      PAGE  26
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<PAGE>      PAGE  27
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<PAGE>      PAGE  28
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<PAGE>      PAGE  29
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<PAGE>      PAGE  30
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<PAGE>      PAGE  31
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<PAGE>      PAGE  33
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<PAGE>      PAGE  34
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<PAGE>      PAGE  35
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<PAGE>      PAGE  36
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<PAGE>      PAGE  37
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064 A000800 N
064 B000800 N
066 A000800 N
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068 A000800 N
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070 F020800 N
070 G010800 N
070 G020800 N
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070 H020800 N
070 I010800 N
070 I020800 N
070 J010800 Y
070 J020800 Y
070 K010800 Y
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070 L020800 Y
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<PAGE>      PAGE  39
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<PAGE>      PAGE  40
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024  000900 Y
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025 B000901 13-2518466
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<PAGE>      PAGE  41
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<PAGE>      PAGE  42
050  000900 N
051  000900 N
052  000900 N
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055 A000900 Y
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057  000900 N
058 A000900 N
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070 A010900 Y
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<PAGE>      PAGE  43
070 E020900 N
070 F010900 N
070 F020900 N
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070 G020900 N
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070 H020900 N
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070 I020900 N
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<PAGE>      PAGE  44
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076  000900     0.00
024  001000 N
<PAGE>      PAGE  45
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045  001000 Y
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<PAGE>      PAGE  46
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<PAGE>      PAGE  47
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<PAGE>      PAGE  48
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<PAGE>      PAGE  49
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024  001100 N
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<PAGE>      PAGE  50
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<PAGE>      PAGE  51
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<PAGE>      PAGE  52
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<PAGE>      PAGE  53
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024  001200 Y
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<PAGE>      PAGE  54
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<PAGE>      PAGE  55
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<PAGE>      PAGE  56
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<PAGE>      PAGE  57
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074 I001200        0
074 J001200     3441
074 K001200        0
074 L001200     1753
074 M001200        7
074 N001200   317283
074 O001200    31201
074 P001200        6
074 Q001200        0
074 R011200        0
074 R021200        0
074 R031200        0
074 R041200      231
074 S001200        0
074 T001200   285845
074 U011200    18095
074 U021200        0
074 V011200    15.80
074 V021200     0.00
074 W001200   0.0000
074 X001200       39
074 Y001200        0
075 A001200        0
075 B001200   180088
076  001200     0.00
SIGNATURE   MARK E. BRADLEY                              
TITLE       ASSISTANT TREASURER 
 


<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000918571
<NAME> MFS VARIABLE INSURANCE TRUST
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   <NUMBER> 07
   <NAME> MFS EMERGING GROWTH SERIES
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<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000918571
<NAME> MFS VARIABLE INSURANCE TRUST
<SERIES>
   <NUMBER> 09
   <NAME> MFS BOND SERIES
<MULTIPLIER> 1
       
<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000918571
<NAME> MFS VARIABLE INSURANCE TRUST
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   <NUMBER> 12
   <NAME> MFS RESEARCH SERIES
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000918571
<NAME> MFS VARIABLE INSURANCE TRUST
<SERIES>
   <NUMBER> 05
   <NAME> MFS GROWTH WITH INCOME SERIES
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<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000918571
<NAME> MFS VARIABLE INSURANCE TRUST
<SERIES>
   <NUMBER> 11
   <NAME> MFS HIGH INCOME SERIES
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000918571
<NAME> MFS VARIABLE INSURANCE TRUST
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   <NUMBER> 08
   <NAME> MFS LIMITED MATURITY SERIES
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000918571
<NAME> MFS VARIABLE INSURANCE TRUST
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   <NUMBER> 04
   <NAME> MFS MONEY MARKET SERIES
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000918571
<NAME> MFS VARIABLE INSURANCE TRUST
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   <NUMBER> 010
   <NAME> FOREIGN & COLONIAL EMERGING MARKETS EQUITY SERIES
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<APPREC-INCREASE-CURRENT>                     (141640)
<NET-CHANGE-FROM-OPS>                         (151535)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                         150000
<NUMBER-OF-SHARES-REDEEMED>                          0
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                         1348465
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                             3350
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                  15943
<AVERAGE-NET-ASSETS>                           1311427
<PER-SHARE-NAV-BEGIN>                            10.00
<PER-SHARE-NII>                                      0
<PER-SHARE-GAIN-APPREC>                         (1.00)
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               9.00
<EXPENSE-RATIO>                                   1.50
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000918571
<NAME> MFS VARIABLE INSURANCE TRUST
<SERIES>
   <NUMBER> 02
   <NAME> MFS TOTAL RETURN SERIES
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               DEC-31-1997
<INVESTMENTS-AT-COST>                         70839879
<INVESTMENTS-AT-VALUE>                        77040474
<RECEIVABLES>                                  1042324
<ASSETS-OTHER>                                     169
<OTHER-ITEMS-ASSETS>                             35977
<TOTAL-ASSETS>                                78118944
<PAYABLE-FOR-SECURITIES>                       2461937
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                        44877
<TOTAL-LIABILITIES>                            2506814
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      66269458
<SHARES-COMMON-STOCK>                          4546608
<SHARES-COMMON-PRIOR>                          1404528
<ACCUMULATED-NII-CURRENT>                      1445727
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                        1696397
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       6200548
<NET-ASSETS>                                  75612130
<DIVIDEND-INCOME>                               589468
<INTEREST-INCOME>                              1305329
<OTHER-INCOME>                                  (5474)
<EXPENSES-NET>                                (442217)
<NET-INVESTMENT-INCOME>                        1447106
<REALIZED-GAINS-CURRENT>                       1695568
<APPREC-INCREASE-CURRENT>                      5126598
<NET-CHANGE-FROM-OPS>                          8269272
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        3451965
<NUMBER-OF-SHARES-REDEEMED>                   (309785)
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                        56362358
<ACCUMULATED-NII-PRIOR>                            226
<ACCUMULATED-GAINS-PRIOR>                         5068
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                           331670
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                 452767
<AVERAGE-NET-ASSETS>                          44462903
<PER-SHARE-NAV-BEGIN>                            13.71
<PER-SHARE-NII>                                   0.52
<PER-SHARE-GAIN-APPREC>                           2.40
<PER-SHARE-DIVIDEND>                              0.00
<PER-SHARE-DISTRIBUTIONS>                         0.00
<RETURNS-OF-CAPITAL>                              0.00
<PER-SHARE-NAV-END>                              16.63
<EXPENSE-RATIO>                                   1.00
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
         

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000918571
<NAME> MFS VARIABLE INSURANCE TRUST
<SERIES>
   <NUMBER> 06
   <NAME> MFS VALUE SERIES
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               DEC-31-1997
<INVESTMENTS-AT-COST>                          5197561
<INVESTMENTS-AT-VALUE>                         5558237
<RECEIVABLES>                                    61381
<ASSETS-OTHER>                                       0
<OTHER-ITEMS-ASSETS>                             56214
<TOTAL-ASSETS>                                 5675832
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                        16004
<TOTAL-LIABILITIES>                              16004
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                       5357872
<SHARES-COMMON-STOCK>                           484368
<SHARES-COMMON-PRIOR>                           126723
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                           (176)
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                       (58715)
<ACCUM-APPREC-OR-DEPREC>                        360847
<NET-ASSETS>                                   5659828
<DIVIDEND-INCOME>                                32794
<INTEREST-INCOME>                                50482
<OTHER-INCOME>                                  (1324)
<EXPENSES-NET>                                 (42819)
<NET-INVESTMENT-INCOME>                          39133
<REALIZED-GAINS-CURRENT>                        659848
<APPREC-INCREASE-CURRENT>                       287712
<NET-CHANGE-FROM-OPS>                           986693
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                      (37655)
<DISTRIBUTIONS-OF-GAINS>                      (640159)
<DISTRIBUTIONS-OTHER>                          (53104)
<NUMBER-OF-SHARES-SOLD>                         779105
<NUMBER-OF-SHARES-REDEEMED>                   (485405)
<SHARES-REINVESTED>                              63945
<NET-CHANGE-IN-ASSETS>                         4308573
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                      (1028)
<GROSS-ADVISORY-FEES>                            32114
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                  89649
<AVERAGE-NET-ASSETS>                           4305248
<PER-SHARE-NAV-BEGIN>                            10.66
<PER-SHARE-NII>                                   0.12
<PER-SHARE-GAIN-APPREC>                           2.66
<PER-SHARE-DIVIDEND>                            (0.09)
<PER-SHARE-DISTRIBUTIONS>                       (1.54)
<RETURNS-OF-CAPITAL>                            (0.13)
<PER-SHARE-NAV-END>                              11.68
<EXPENSE-RATIO>                                   1.00
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000918571
<NAME> MFS VARIABLE INSURANCE TRUST
<SERIES>
   <NUMBER> 003
   <NAME> MFS UTILITIES SERIES
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               DEC-31-1997
<INVESTMENTS-AT-COST>                         27136956
<INVESTMENTS-AT-VALUE>                        30279709
<RECEIVABLES>                                  1128118
<ASSETS-OTHER>                                      84
<OTHER-ITEMS-ASSETS>                              6595
<TOTAL-ASSETS>                                31414506
<PAYABLE-FOR-SECURITIES>                       1154706
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       112988
<TOTAL-LIABILITIES>                            1267694
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      24158269
<SHARES-COMMON-STOCK>                          1676065
<SHARES-COMMON-PRIOR>                           700567
<ACCUMULATED-NII-CURRENT>                       512876
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                        2332966
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       3142701
<NET-ASSETS>                                  30146812
<DIVIDEND-INCOME>                               485746
<INTEREST-INCOME>                               215364
<OTHER-INCOME>                                 (11010)
<EXPENSES-NET>                                (175489)
<NET-INVESTMENT-INCOME>                         514611
<REALIZED-GAINS-CURRENT>                       2337591
<APPREC-INCREASE-CURRENT>                      2531459
<NET-CHANGE-FROM-OPS>                          5383661
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        1542046
<NUMBER-OF-SHARES-REDEEMED>                   (566548)
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                        20574671
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                      (1816)
<GROSS-ADVISORY-FEES>                           131652
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                 212192
<AVERAGE-NET-ASSETS>                          17644637
<PER-SHARE-NAV-BEGIN>                            13.66
<PER-SHARE-NII>                                   0.44
<PER-SHARE-GAIN-APPREC>                           3.89
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              17.99
<EXPENSE-RATIO>                                   1.00
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000918571
<NAME> MFS VARIABLE INSURANCE TRUST
<SERIES>
   <NUMBER> 01
   <NAME> MFS WORLD GOVERNMENTS SERIES
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               DEC-31-1997
<INVESTMENTS-AT-COST>                         37397683
<INVESTMENTS-AT-VALUE>                        37314122
<RECEIVABLES>                                  3265788
<ASSETS-OTHER>                                    2397
<OTHER-ITEMS-ASSETS>                             46574
<TOTAL-ASSETS>                                40628881
<PAYABLE-FOR-SECURITIES>                       1885651
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       684763
<TOTAL-LIABILITIES>                            2570414
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      37806443
<SHARES-COMMON-STOCK>                          3727865
<SHARES-COMMON-PRIOR>                          2459773
<ACCUMULATED-NII-CURRENT>                       552118
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                        238099
<ACCUM-APPREC-OR-DEPREC>                       (61995)
<NET-ASSETS>                                  38058467
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                              2302916
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                  329892
<NET-INVESTMENT-INCOME>                        1973024
<REALIZED-GAINS-CURRENT>                     (2045124)
<APPREC-INCREASE-CURRENT>                    (1880032)
<NET-CHANGE-FROM-OPS>                            92992
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                      490,069
<DISTRIBUTIONS-OF-GAINS>                        221999
<DISTRIBUTIONS-OTHER>                               84
<NUMBER-OF-SHARES-SOLD>                        3486026
<NUMBER-OF-SHARES-REDEEMED>                  (2289007)
<SHARES-REINVESTED>                              71073
<NET-CHANGE-IN-ASSETS>                        12035514
<ACCUMULATED-NII-PRIOR>                         876272
<ACCUMULATED-GAINS-PRIOR>                       221999
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                           247419
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                 382069
<AVERAGE-NET-ASSETS>                          33097933     
<PER-SHARE-NAV-BEGIN>                            10.58
<PER-SHARE-NII>                                   0.61
<PER-SHARE-GAIN-APPREC>                         (0.73)
<PER-SHARE-DIVIDEND>                            (0.17)     
<PER-SHARE-DISTRIBUTIONS>                       (0.08)
<RETURNS-OF-CAPITAL>                              0.00   
<PER-SHARE-NAV-END>                              10.21
<EXPENSE-RATIO>                                   1.00
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                              0.00
        


</TABLE>


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