MFS MUNICIPAL SERIES TRUST
N-30D, 1995-05-25
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<PAGE>

MFS
THE FIRST NAME IN MUTUAL FUNDS

ANNUAL REPORT FOR
YEAR ENDED
MARCH 31, 1995

MFS(R) MUNICIPAL INCOME FUND





<PAGE>
<TABLE>
<CAPTION>
MFS(R) MUNICIPAL INCOME FUND

<S>                                                           <C>
TRUSTEES                                                      CUSTODIAN
A. Keith Brodkin* - Chairman and President                    State Street Bank and Trust Company

Richard B. Bailey* - Private Investor;                        AUDITORS
Former Chairman and Director (until 1991),                    Deloitte & Touche LLP
Massachusetts Financial Services Company
                                                              INVESTOR INFORMATION
Marshall N. Cohan - Private Investor                          For MFS stock and bond market outlooks,
                                                              call toll free: 1-800-637-4458 anytime from
Lawrence H. Cohn, M.D. - Chief of Cardiac Surgery, Brigham    a touch-tone telephone.
and Women's Hospital; Professor of
Surgery, Harvard Medical School                               For information on MFS mutual funds,
                                                              call your financial adviser or, for an
The Hon. Sir J. David Gibbons, KBE - Chief                    information kit, call toll free:
Executive Officer, Edmund Gibbons Ltd.;                       1-800-637-2929 any business day from
Chairman, Bank of N.T. Butterfield & Son Ltd.                 9 a.m. to 5 p.m. Eastern time (or leave
                                                              a message anytime).
Abby M. O'Neill - Private Investor;
Director, Rockefeller Financial Services, Inc.                INVESTOR SERVICE
(Investment Advisers)                                         MFS Service Center, Inc.
                                                              P.O. Box 2281
Walter E. Robb, III - President and Treasurer,                Boston, MA 02107-9906
Benchmark Advisors, Inc. (Corporate Financial
Consultants)                                                  For general information, call toll free:
                                                              1-800-225-2606 any business day from
Arnold D. Scott* - Senior Executive Vice President            8 a.m. to 8 p.m. Eastern time.
and Secretary, Massachusetts Financial Services
Company                                                       For service to speech- or hearing-impaired,
                                                              call toll free: 1-800-637-6576 any business
Jeffrey L. Shames* - President and Chief Equity               day from 9 a.m. to 5 p.m. Eastern time.
Officer, Massachusetts Financial Services Company             (To use this service, your phone must be
                                                              equipped with a Telecommunications
J. Dale Sherratt - President, Insight Resources, Inc.         Device for the Deaf.)
(Acquisition Planning Specialists)
                                                              For share prices, account balances and
Ward Smith - Former Chairman (until 1994),                    exchanges, call toll free: 1-800-MFS-TALK
NACCO Industries; Director, Sundstrand                        (1-800-637-8255) anytime from a touch-tone
Corporation                                                   telephone.

INVESTMENT  ADVISER
Massachusetts Financial Services Company
500 Boylston Street
Boston, Massachusetts 02116-3741

PORTFOLIO  MANAGER
David B. Smith*                                               TOP-RATED SERVICE
                                                              MFS was rated first when 
TREASURER                                                     securities firms evaluated the
W. Thomas London*                                             quality of service they receive
                                                              from 40 mutual fund companies.
ASSISTANT  TREASURER                                          MFS got high marks for answering
James O. Yost*                                                calls quickly, processing trans-
                                                              actions accurately and sending
SECRETARY                                                     statements out on time.
Stephen E. Cavan*                                                  (Source: 1994 DALBAR Survey)

ASSISTANT  SECRETARY
James R. Bordewick, Jr.*




                                                              Cover photo: Through their wide range of
                                                              investments, MFS mutual funds help you
*Affiliated with the Investment Adviser                       share in America's growth.
</TABLE>




LETTER  TO  SHAREHOLDERS


Dear Shareholders:
During the fiscal year ended March 31, 1995, Class A shares of the Fund provided
a total  return of  +6.33%,  Class B shares  +5.32%,  and Class C shares  +5.39%
(including the  reinvestment of  distributions  but excluding the effects of any
sales charges).  These results  underperformed  the +7.43% return for the Lehman
Brothers  Municipal Bond Index,  an unmanaged  index of national  municipal bond
investments  rated Baa or  higher.  Over the  period,  the  Fund's  holdings  of
primarily  premium coupon bonds provided  below-average  sensitivity to changing
interest  rates.  While this benefited the Fund during the first eight months of
the fiscal year when interest rates were rising,  it detracted from  performance
over the latter four months of the period when interest rates changed course and
began falling.  A discussion of the Fund's  performance  and our outlook for the
months ahead may be found in the  Portfolio  Performance  and  Strategy  section
below.

Economic Environment
The economic expansion,  entering its fifth year, gained firmer underpinnings in
1994 as employers significantly stepped up hiring levels.  Increased employment,
stronger capital spending by businesses,  and strengthening  overseas  economies
resulted in 4.1% real  (adjusted for inflation)  gross  domestic  product growth
last year.  Interest rates rose  substantially  over the past year, which should
help restrain, but not curtail, the economic expansion.  Based on sound economic
fundamentals both here and abroad, we expect the business  expansion to continue
well into 1995. However, recent data, including a March rise in the unemployment
rate and the first decline in industrial production in six months,  indicate the
increased likelihood of a deceleration in the economy.
    Despite a stonger  economy,  inflation  at the  consumer  level has remained
relatively benign at 2.7% in 1994, the fourth straight year of 3.0% or less. Due
to a  prolonged  period of  below-trend-line  growth and  continued  pressure on
corporations  to emphasize  effective cost controls,  wage growth and unit labor
costs have remained subdued.  However,  as the economy has exhibited  continuing
strength,  various  industrial  commodity prices have been rising  substantially
faster  than  consumer  prices.  Nevertheless,  businesses  have had  difficulty
passing these price increases on to the consumer. With the economy continuing to
expand,  we expect some upward movement in inflation from below 3% to the 3 1/2%
range.

Municipal Bond Market
Municipal bond investors  experienced  unusual volatility during the fiscal year
ended March 31, 1995,  with  long-term  yields  rising 100 basis points  through
mid-November,  then retracing to finish the fiscal year unchanged. The municipal
bond  market  was  battered  during  the  first  half  of the  fiscal  year by a
combination of rising  inflationary fears spurred by strong economic growth, and
heavy selling by tax-exempt mutual funds.  However,  the market began to improve
in December,  when  inflation  fears subsided and market  participants  began to
focus on the reduced supply of municipal  bonds.   During 1994, new-issue supply
declined 44% from 1993's record level, and was down an additional 46% during the
first  three  months of this  year.  This  reduction  in supply,  combined  with
historically heavy bond calls and redemptions, should result in an unprecedented
two consecutive years of fewer bonds outstanding.
    We believe municipals continue to represent good value based on our forecast
of stable to lower  long-term  interest  rates,  and that  they  should  provide
attractive after-tax returns relative to alternative fixed-income investments.

Portfolio Performance and Strategy
During the past 12 months,  the Fund was able to increase its  dividend  rate by
capturing  additional  yield  available  in the  non-rated  sector of the market
versus lower investment-grade  bonds, and by emphasizing  investment-grade bonds
with structures resulting in greater-income characteristics. Over the period, we
added to the Fund's  holdings in  noncallable  bonds,  reduced  its  exposure to
HUD-guaranteed  housing  bonds,  and  reduced our  holdings  in Denver  Airport,
capturing a large gain in that  position.  Our exposure to  corporate-guaranteed
airport bonds elsewhere  increased  slightly during the period, as we endeavored
to capture the cyclical  improvement  currently  being  experienced by the major
airlines.
    Recent  credit  developments  involving   municipalities  and  the  changing
environment  for  electric  utilities  and  hospitals  clearly  demonstrate  the
importance  of  fundamental  credit  analysis.  We will  continue  to search for
relative  values in these  sectors  and look for  opportunities  to  reduce  our
exposure to declining  credits where  appropriate.  We will be placing increased
emphasis  on  improving  the  call  protection  of the  Fund  while,  hopefully,
minimizing any adverse effects this may have on distributable income.
    We  appreciate  your  support and welcome any  questions or comments you may
have.

Respectfully,
------------------              ------------------

A 1-1/2" x 1-5/8" photo         A 1-1/2" x 1-5/8" photo
of A. Keith Brodkin,            of Dvid B. Smith,
Chairman and President          Portfolio Mnager.


------------------              ------------------


/s/A. Keith Brodkin             /s/David B. Smith
-------------------             ------------------
A.  Keith Brodkin               David B. Smith
Chairman and President          Portfolio Manager


April 17, 1995

OBJECTIVE  AND  POLICIES

The Fund's investment  objective is to provide as high a level of current income
exempt from  federal  income  taxes as is  considered  consistent  with  prudent
investing and protection of shareholders' capital.

The Fund seeks to achieve its  investment  objective by  investing  primarily in
debt securities issued by or on behalf of states, territories and possessions of
the United States and the District of Columbia and their political subdivisions,
agencies or  instrumentalities,  the  interest  on which is exempt from  federal
income tax.

TAX  FORM  SUMMARY

In January  1995,  shareholders  were mailed a Tax Form  Summary  reporting  the
federal tax status of all distributions paid during the calendar year 1994.

PERFORMANCE

The information  below  illustrates the historical  performance of MFS Municipal
Income Fund Class B shares in comparison to various market  indicators.  Class B
share  results  in the graph do not  reflect  the  deduction  of any  contingent
deferred sales charge (CDSC) since the CDSC is not  applicable  after a six-year
period.  Benchmark  comparisons  are  unmanaged  and do not  reflect any fees or
expenses. You cannot invest in an index. All results reflect the reinvestment of
all dividends and capital gains.

Class A shares were offered effective September 7, 1993.  Information on Class A
share performance appears on the next page.

Class C shares were offered  effective  January 3, 1994.  Information on Class C
share performance appears on the next page.



<PAGE>
GROWTH OF A HYPOTHETICAL $10,000 INVESTMENT
(For the Period from January 1, 1987 to March 31, 1995)



Page 3

Line graph  representing the growth of a $10,000  investment for the period from
January 1, 1987 to March 31, 1995. The graph is scaled from $7,500 to $20,000 in
$2,500  segments.  The years are marked from 1987 to 1995. There are three lines
drawn to scale.  One is a solid line  representing  MFS  Municipal  Income  Fund
(Class  B), a  second  line of  short  dashes  represents  the  Lehman  Brothers
Municipal  Bond Index,  and a third line of long dashes  represents the Consumer
Price Index.

MFS Municipal Income Fund (Class B)                       $16,332
Lehman Brothers Municipal Bond Index                      $18,491
Consumer Price Index                                      $13,698


AVERAGE  ANNUAL  TOTAL  RETURNS

<TABLE>
<CAPTION>
                                                                                                 Life of Class
                                                                                                 through
                                                         1 Year      3 Years        5 Years      3/31/95
--------------------------------------------------------------------------------------------------------------
<S>                                                      <C>         <C>            <C>          <C>
MFS Municipal Income Fund (Class A) including
  4.75% sales charge                                     +1.24%       --            --           -1.19%<F1>
--------------------------------------------------------------------------------------------------------------
MFS Municipal Income Fund (Class A) at net
  asset value                                            +6.33%       --            --           +1.97%<F1>
--------------------------------------------------------------------------------------------------------------
MFS Municipal Income Fund (Class B) with CDSC<F5>        +1.32%       +5.27%        +6.38%       +6.12%<F2>
--------------------------------------------------------------------------------------------------------------
MFS Municipal Income Fund (Class B) without CDSC         +5.32%       +6.16%        +6.69%       +6.12%<F2>
--------------------------------------------------------------------------------------------------------------
MFS Municipal Income Fund (Class C)                      +5.39%       --            --           +0.46%<F3>
--------------------------------------------------------------------------------------------------------------
Lehman Brothers Municipal Bond Index                     +7.43%       +7.34%        +8.24%       +7.74%<F4>
--------------------------------------------------------------------------------------------------------------
Consumer Price Index<F6>                                 +2.85%       +2.82%        +3.30%       +3.89%<F4>
--------------------------------------------------------------------------------------------------------------

All results are historical and,  therefore,  are not an indication of future  results.  The principal value and
income return of an investment in a mutual fund will vary with changes in market conditions,  and shares,  when
redeemed,  may be worth more or less than their original  cost.  Class C shares have no initial sales charge or
CDSC but, along with Class B shares, have higher annual fees and expenses than Class A shares.

<FN>
<F1>For the period from the commencement of offering of Class A shares, September 7, 1993 to March 31, 1995.
<F2>For the period from the commencement of offering of Class B shares, December 29, 1986 to March 31, 1995.
<F3>For the period from the commencement of offering of Class C shares,  January 3, 1994 to March 31, 1995.
<F4>Benchmark comparisons begin on January 1, 1987.
<F5>These returns reflect the applicable CDSC of 4%, 3% and 2% for the 1-, 3- and 5-year periods, respectively,
    and 0% for the period commencing December 29, 1986.
<F6>The Consumer Price Index is a popular measure of change in prices.
</TABLE>




<PAGE>
PORTFOLIO  OF  INVESTMENTS - March 31, 1995

Municipal  Bonds - 99.7%
------------------------------------------------------------------------------
S&P
Bond
Rating                                           Principal Amount
(Unaudited)      Issuer                              (000 Omitted)     Value
------------------------------------------------------------------------------
        Student Loan Revenue - 1.3%
AAA       Pennsylvania Higher Education Assistance
            Agency, 9.24s, 2026*                          $ 5,500 $  5,798,760
------------------------------------------------------------------------------
        General Obligation - 10.3%
NR        Arlington, TX, Independent School
            Refunding Rev., PSF, 0s, 2007                 $ 3,070 $  1,562,017
A+        Commonwealth of Massachusetts, 7s, 2007           2,590    2,834,704
AA+       Harris County, TX, Certificates of
            Obligation (Astrodome Improvements
            Project), 8.1s, 2008                            1,385    1,523,431
A-        New York, NY, 8.2s, 2003                          5,000    5,610,450
A-        New York, NY, 7.5s, 2008                          1,350    1,423,927
A-        New York, NY, 6.25s, 2009                         3,400    3,258,866
A-        New York, NY, 8.25s, 2010                         2,335    2,559,533
A-        New York, NY, 8s, 2018                               30       32,343
AAA       Northwest Texas, Independent School
            District, AMBAC, 0s, 2011                       3,000    1,133,400
AA        State of Texas, 7.625s, 2018                     14,405   15,703,754
AA        State of Wisconsin, 8.1s, 2018                    7,115    7,773,991
AA        State of Wisconsin, 7.6s, 2020                    2,865    2,998,309
                                                                   -----------
                                                                  $ 46,414,725
------------------------------------------------------------------------------
        State and Local Appropriation - 3.2%
A+        Indianapolis, IN, Local Public
            Improvement Bond Bank, 6.75s, 2020            $ 1,000 $  1,019,460
BBB+      New York Dormitory Authority Rev. (City
            University), 7.5s, 2010                         2,500    2,800,700
BBB+      New York Medical Care Facility,
            Financial Agency Rev., 8.875s, 2007               770      843,374
BBB+      New York Medical Care Facility,
            Financial Agency Rev., 7.875s, 2008               745      814,427
BBB+      New York Medical Care Facility,
            Financial Agency Rev., 7.875s, 2020             2,580    2,808,072
BBB+      New York Medical Care Facility,
            Financial Agency Rev., 7.5s, 2021                 540      581,678
BBB       New York Urban Development Corp. (State
            Facilities), 7.5s, 2011                         2,500    2,694,550
AAA       Philadelphia, PA, Regional Port
            Authority Lease Rev., MBIA, MVRIC,
            8.87s, 2020*                                    2,500    2,539,125
                                                                   -----------
                                                                  $ 14,101,386
------------------------------------------------------------------------------
        Refunded and Special Obligation - 20.3%
AAA       Adams County, CO, Single Family Mortgage
            Rev., 8.875s, 2011                            $ 2,510 $  3,235,315
NR        Chapel Hill, NC, Parking Facilities Rev.
            (Rosemary Street Project), 8.125s, 2013           960    1,113,801
NR        Chapel Hill, NC, Parking Facilities Rev.
            (Rosemary Street Project), 8.25s, 2023          1,000    1,166,270
AAA       Commonwealth of Massachusetts, 7.5s, 2007         1,990    2,262,173
A+        Commonwealth of Massachusetts, 7.5s, 2007         2,010    2,284,907
NR        Dayton, OH, Special Facilities Rev.
            (Emery Air Freight), "A", 12.5s, 2009           1,000    1,176,010
AAA       Henrico County, VA, Industrial
            Development Authority Rev., 7.34s, 2027*        5,000    4,770,900
NR        Illinois Education and Facilities
            Authority, 8.75s, 2015                          1,440    1,493,338
NR        Illinois Education and Facilities
            Authority, 8.75s, 2015                             60       62,119
AA        Intermountain Power Agency, UT, Power
            Supply Rev., 7s, 2021                           5,000    5,467,900
AAA       Los Angeles, CA, Convention & Exhibition
            Center Authority, Certficates of 
            Participation, 7.375s, 2018                   $ 2,000    2,220,300
NR        Massachusetts Health & Education
            Facilities Authority Rev. (Suffolk
            University), 8s, 2010                           1,000    1,141,650
NR        Massachusetts Health & Education
            Facilities Authority Rev. (Youville
            Hospital), 9.1s, 2015                             915      966,834
AAA       Massachusetts Water Resources Authority,
            7.625s, 2014                                    3,200    3,616,480
AAA       New York Local Government Assistance
            Corp., 7.25s, 2018                              2,750    3,107,473
A-        New York, NY, Pre-Refunded, "A", 8.25s,
            2010                                            2,165    2,562,472
A-        New York, NY, Pre-Refunded, "A", 8.25s,
            2018                                            2,970    3,459,307
AAA       New York Medical Care Facility,
            Financial Agency Rev., 8.875s, 2007               680      756,670
AAA       New York Medical Care Facility,
            Financial Agency Rev., 7.875s, 2008               670      771,458
BBB+      New York Medical Care Facility,
            Financial Agency Rev., 7.75s, 2020              1,030    1,169,278
AAA       New York Medical Care Facility,
            Financial Agency Rev., 7.875s, 2020             3,565    4,104,848
AAA       New York Medical Care Facility,
            Financial Agency Rev., 7.75s, 2021              1,460    1,665,042
NR        New York Urban Development Corp.
            (Correctional Facilities), 7.75s, 2014          5,000    5,663,100
NR        New York Urban Development Corp Rev.,
            7.3s, 2008                                      2,340    2,670,548
A-        Pennsylvania Industrial Development
            Authority Rev., 7s, 2011                        7,000    7,784,210
AAA       Philadelphia, PA, Municipal Authority
            Rev., 7s, 2004                                  2,000    2,245,380
NR        Texas Turnpike Authority Rev. (Houston
            Ship Channel Bridge), 0s, 2020                  3,000    3,979,920
AAA       Washington County, PA, Authority Lease
            Rev., 7.45s, 2018                               1,200    1,360,645
AAA       Washington Public Power Supply System
            Rev., Nuclear Project #1, 14.375s, 2001         1,000    1,345,870
AAA       Washington Public Power Supply System
            Rev., Nuclear Project #1, 7.25s, 2015           3,350    3,694,480
AAA       Washington Public Power Supply System
            Rev., Nuclear Project #2, 7.375s, 2012          5,355    6,003,222
AA        Washington Public Power Supply System
            Rev., Nuclear Project #3, 7.25s, 2015           5,000    5,514,150
BBB+      West Virginia Water Development
            Authority, 8.625s, 2028                         1,000    1,134,490
BBB+      West Virginia Water Development Authority,
            8.125s, 2029                                    1,000    1,118,340
                                                                    -----------
                                                                  $ 91,088,900
--------------------------------------------------------------------------------
        Single Family Housing Revenue - 9.2%
AAA       Berkeley, Brookes, & Fayette Counties,
            WV, MBIA, 0s, 2016                           $ 14,000 $  1,415,540
AAA       Chicago, IL, Residential Mortgage Rev.,
            0s, 2009                                        7,000    2,495,360
BB        Cook County, IL, Single Family Housing,
            0s, 2015                                       14,745    1,625,637
NR        De Kalb, IL, Single Family Mortgage
            Rev., 7.45s, 2009                                 280      295,898
NR        Delaware Housing Authority Rev., 9.125s,
            2018                                              915      953,192
BB        Harris County, TX, Housing Finance
            Corp., 9.625s, 2003                               285      285,043
BB        Harris County, TX, Housing Finance
            Corp., 9.875s, 2014                               505      505,080
A+        Illinois Housing Development Agency, 0s,
            2016                                            8,785      954,841
AAA       Kentucky Housing Corp., Housing Rev.,
            FHA, 7.45s, 2023                                6,280    6,610,453
AAA       Louisiana Housing Finance Agency, Single
            Family Mortgage Rev., FGIC, 9.375s, 2015          310      320,628
AA+       Minnesota Housing Finance Agency, 9s, 2018        4,655    4,806,427
NR        Mississippi Home Corp., Single Family
            Rev., 7.1s, 2023                                  870      899,388
A+        New Hampshire Housing Finance Authority,
            7.2s, 2010                                      7,000    7,346,990
A+        New Hampshire Housing Finance Authority,
            8.625s, 2013                                      755      789,172
A+        Tennessee Housing Development Agency,
            8.25s, 2020                                     1,880    1,974,620
A+        Tennessee Housing Development Agency,
            8.125s, 2021                                    2,145    2,241,868
AA        Utah Housing Finance Agency, 8.625s, 2019         1,750    1,820,962
AA        Utah Housing Finance Agency, 9.125s, 2019           195      203,470
AA        Utah Housing Finance Agency, 9.25s, 2019            135      145,089
A+        West Virginia Housing Development Fund,
            7.85s, 2014                                     5,470    5,733,763
                                                                   -----------
                                                                  $ 41,423,421
------------------------------------------------------------------------------
        Multi-Family Housing Revenue - 3.1%
BBB       Colorado Housing Finance Authority,
            8.3s, 2023                                    $ 2,750 $  2,896,768
NR        Maryland Community Development
            Administration, 8.5s, 2028                      3,000    3,125,670
A+        Pennsylvania Housing Finance Agency,
            7.6s, 2013                                      1,000    1,073,540
AA-       Vermont Housing Finance Agency, 8.375s,
            2020                                            2,760    2,878,762
A         Wisconsin Housing & Economic Development
            Authority, 7.2s, 2013                           4,000    4,134,200
                                                                   -----------
                                                                  $ 14,108,940
------------------------------------------------------------------------------
        Insured Health Care Revenue - 3.1%
AAA       Clermont County, OH, Hospital Facilities
            Rev. (Mercy Health System), AMBAC,
            MVRIC, 9.991s, 2021*                          $ 1,500 $  1,626,135
AAA       Colorado Health Facilities Authority
            Rev. (PSL Health Systems), FSA, 7.25s,
            2016                                            2,000    2,157,780
AAA       Fredericksburg, VA, Industrial
            Development Authority, Hospital
            Facilities Rev., FGIC, INFLOS, 8.759s, 2023*    1,500    1,597,785
AAA       Jefferson County, KY, Hospital Rev.
            (Alliant Health
        System), INFLOS, MBIA, 8.38s, 2014*                 1,500    1,572,945
AAA       Mississippi Hospital Equipment &
            Facilities Authority Rev. (Rush
            Medical Foundation), Connie Lee, 6.7s, 2018     1,000    1,027,200
AAA       Rio Grande Valley, TX, Health Facilities
            Development Corp., MBIA, Short Rites,
            7.72s, 2015*#                                   2,800    2,841,749
AAA       Tulsa, OK, Industrial Authority,
            Hospital Rev. (St. John's Medical
            Center), MBIA, 0s, 2006                         6,430    3,283,929
                                                                   -----------
                                                                  $ 14,107,523
------------------------------------------------------------------------------
        Health Care Revenue - 4.6%
NR        Bell County, TX, Health Facilities
            Development Corp. (Advanced Living
            Technology), 10.5s, 2018                      $ 2,000 $  1,840,000
BBB-      Bell County, TX, Health Facilities
            Development Corp. (Kings Daughters
            Hospital), 9.25s, 2008                          1,720    1,901,649
BBB       Colorado Health Facilities Authority
            Rev. (Rocky
        Mountain Adventist), 6.625s, 2013                   1,000      955,600
NR        Fulton County, GA, Residential Care
            Facilities, Elderly Authority Rev.
            (Lenbrook Square Foundation), 9.75s, 2017         480      497,045
NR        Gadsden County, FL, Industrial
            Development Authority (RHA/FLA
            Properties), 10.45s, 2018                       1,970    2,022,699
        Health Care Revenue - continued
NR        Louisiana Public Facilities Authority
            (Southwest Medical Center), 11s, 2006         $ 1,655 $    992,328
A         Massachusetts Health & Educational
            Facilities Rev., 6.875s, 2022                   6,000    6,050,880
BBB+      New York Medical Care Facilities Agency,
            Mental Health Services, 7.75s, 2020             1,025    1,102,336
NR        Philadelphia, PA, Industrial Development
            Authority, 10.25s, 2018                         1,980    2,042,747
NR        Philadelphia, PA, Industrial Development
            Authority, 10.25s, 2018                         1,485    1,529,535
A         Torrance, CA, Hospital Rev., 6.875s, 2015         1,815    1,863,242
                                                                   -----------
                                                                  $ 20,798,061
------------------------------------------------------------------------------
        Electric and Gas Utility Revenue - 9.8%
AAA       Austin, TX, Utilities System Rev.,
            AMBAC, 0s, 2010                               $ 7,500 $  2,944,875
NR        Chelan County, WA, Public Utility
            District #1,
        Consolidated Rev., 9.3s, 2062                       4,450    4,911,020
AAA       Georgia Municipal Electric Authority,
            MBIA, 6.375s, 2016*                             2,000    2,085,240
NR        Midland, MI, Environmental Development
            Authority, Pollution Control Rev. (Midland
            Cogeneration), 9.5s, 2009                       2,000    2,139,000
NR        Montana Board of Investment Resources
            Recovery Rev. (Yellowstone Energy),
            7s, 2019                                        3,000    2,798,910
AAA       Municipal Electric Authority, GA,
            Special Obligation, MBIA, 6.5s, 2020            7,350    7,712,796
A-        North Carolina Eastern Municipal Power
            Agency, 7s, 2007                                3,250    3,443,277
AAA       Texas Municipal Power Agency Rev., 0s,
            2011                                            5,930    2,220,192
AAA       Texas Municipal Power Agency Rev., 0s,
            2013                                            6,000    1,957,320
AAA       Texas Municipal Power Agency Rev., 0s,
            2014                                           10,435    3,203,023
AA        Washington Public Power Supply System
            Rev., Nuclear Project #1, 0s, 2003              2,000    1,246,560
AA        Washington Public Power Supply System
            Rev., Nuclear Project #1, 7s, 2011              4,050    4,228,564
AA        Washington Public Power Supply System
            Rev., Nuclear Project #3, 0s, 2004              4,885    2,849,469
AAA       Washington Public Power Supply Systems,
            Series "A", BIGI, 0s, 2013                      4,000    1,288,120
AAA       Washington Public Power Supply Systems,
            Series "A", BIGI, 0s, 2014                      3,350    1,013,777
                                                                   -----------
                                                                  $ 44,042,143
------------------------------------------------------------------------------
        Water and Sewer Utility Revenue - 3.8%
AAA       Contra Costa, CA, Water District Rev.,
            MBIA, 5.5s, 2019                              $ 4,000 $  3,687,080
AAA       Harris County, TX, Flood Control
            District, FGIC, 0s, 2010                        3,545    1,408,534
A         Massachusetts Water Resources Authority,
            6.5s, 2019                                      7,495    7,881,442
AAA       Salt Lake County, UT, Water Conservancy
            District Rev., AMBAC, 0s, 2008                  2,100      946,176
AAA       Salt Lake County, UT, Water Conservancy
            District Rev., AMBAC, 0s, 2009                  3,800    1,604,816
A-        Union County, NJ, Utilities Authority
            Solid Waste, 7.2s, 2014                         1,500    1,520,160
                                                                   -----------
                                                                  $ 17,048,208
------------------------------------------------------------------------------
        Turnpike Revenue - 3.4%
NR        Massachusetts Industrial Finance Agency,
            Tunnel Rev. (Mass. Turnpike), 9s, 2020        $ 2,900 $  3,121,328
AA-       Michigan Trunk Line, Series "A", 5.5s,
            2021                                            5,000    4,626,700
AA-       Michigan Trunk Line, Series "B", 5.5s,
            2021                                            3,000    2,776,020
A         New Jersey Turnpike Authority, Turnpike
            Rev., 6.5s, 2016                                1,450    1,531,591
NR        San Joaquin Hills, CA, Transportation
            Corridor Agency, Toll Road Rev., 0s,
            2005                                            1,800      852,462
NR        San Joaquin Hills, CA, Transportation
            Corridor Agency, Toll Road Rev., 0s,
            2009                                            6,750    2,320,650
                                                                   -----------
                                                                  $ 15,228,751
------------------------------------------------------------------------------
        Airport and Port Revenue - 13.4%
BB+       Chicago, IL, O'Hare International
            Airport, Special Facilities Rev.
            (AMR), 7.875s, 2025                           $ 3,500 $  3,608,430
BB        Chicago, IL, O'Hare International
            Airport, Special
        Facilities Rev. (United Airlines), 8.4s,
            2018                                            2,025    2,151,907
BB        Chicago, IL, O'Hare International
            Airport, Special Facilities Rev. 
            (United Airlines), 8.85s, 2018                  2,950    3,269,573
BB        Chicago, IL, O'Hare International
            Airport, Special
        Facilities Rev. (United Airlines), 8.85s,
            2018                                            6,535    7,242,936
NR        Cleveland, OH, Airport, Special
            Facilities Rev. (Continental Airlines),
            9s, 2019                                        5,300    5,318,391
AAA       Connecticut Airport Rev., FGIC, 7.65s, 2012       1,000    1,130,670
BB+       Dallas-Fort Worth, TX, International
            Airport Facilities (AMR), 7.5s, 2025            5,000    5,056,000
BB        Denver, CO, City & County Airport Rev.,
            8.75s, 2023                                     4,750    5,234,785
AAA       Hawaii Airport Systems Rev., FGIC, 7.5s,
            2020                                            5,350    5,751,945
BB        Kenton County, KY, Airport Board Special
            Facilities (Delta Airlines), 7.5s, 2020         1,000    1,018,640
AAA       Metropolitan Washington District of
            Columbia Airports Authority, FGIC,
            7.25s, 2010                                     4,000    4,324,480
NR        St. Augustine, FL, Airport Authority
            (Grumman Repair Facility), 11s, 2004              500      536,500
BB+       Tulsa, OK, Municipal Airport Trust Rev.
            (AMR), 7.375s, 2020                            12,000   12,132,360
A+        Virginia Port Authority, 8.2s, 2008               3,000    3,316,080
                                                                   -----------
                                                                  $ 60,092,697
------------------------------------------------------------------------------
        Industrial Revenue (Corporate Guarantee) -  7.2%
BBB       Brazos River Authority, TX, Pollution
            Control Rev. (Texas Utilities), 9.875s, 2017  $ 8,890 $  9,770,910
BBB       Brazos River Authority, TX, Pollution
            Control Rev. (Texas Utilities), 9.25s, 2018     1,000    1,090,620
A+        Burke County, GA, Pollution Control Rev.
            (Georgia Power Co./Vogtle Project),
            9.375s, 2017                                    2,650    2,945,582
NR        Burns Harbor, IN, Solid Waste Disposal
            Facilities Rev. (Bethlehem Steel), 8s,
            2024                                            3,000    3,065,460
A         Charleston County, SC, Resource Recovery
            Rev. (Foster Wheeler), 9.25s, 2010              3,200    3,523,840
AA-       Chicago, IL, Gas Supply Rev. (People's
            Gas), 8.1s, 2020                                2,000    2,230,820
A-        Erie County, PA (International Paper),
            7.875s, 2016                                    1,200    1,289,148
A-        Matagorda County, TX, Pollution Control
            Rev. (Central Power & Light), 7.875s,
            2016                                            1,500    1,582,485
NR        Port of New Orleans, LA (Avondale
            Industries), 8.5s, 2014                         2,000    2,088,560
BB-       Port of New Orleans, LA (Continental
            Grain Co.), 7.5s, 2013                          1,000    1,015,170
NR        San Joaquin Hills, CA, Transportation
            Corridor Agency, 0s, 2004                       3,000    1,534,050
BBB       West Side Calhoun County, TX, Navigation
            District, 8.2s, 2021                            2,000    2,196,880
                                                                   -----------
                                                                  $ 32,333,525
------------------------------------------------------------------------------
        Universities - 0.4%
AA-       Michigan State University Rev., 5.5s,
            2022                                          $ 2,000 $  1,821,340
------------------------------------------------------------------------------
        Miscellaneous Revenue - 6.6%
NR        Atlanta, GA, Downtown Development Authority,
            11.5s, 2015**++                               $ 1,055 $    316,548
NR        Bristol, CT, Resource Recovery
            Facilities, 6.5s, 2014##                        8,000    7,624,560
NR        Crystal City, TX, Lease Obligations, 10.5s,
            2008+                                           1,252    1,197,172
BBB-      Greater Detroit, MI, Resource Recovery
            Authority, 9.25s, 2008                          2,130    2,224,785
AAA       Illinois Dedicated Tax, Civic Center,
            AMBAC, 0s, 2016                                 5,000    1,285,100
NR        Martha's Vineyard, MA, Land Bank,
            8.125s, 2011                                    1,900    1,929,698
NR        Maryland Energy Financing Administration
            (Solid Waste), 9s, 2016                         4,000    3,995,480
NR        Massachusetts Health & Education
            Facilities Authority Rev. (Learning
            Center for Deaf Children), 9.25s, 2014          1,000    1,069,290
NR        Pittsylvania County, VA, Industrial
            Development Authority Rev., 7.5s, 2014          6,000    6,072,780
NR        Retema, TX, Special Facilities Rev.
            (Retema Park Racetrack Project), 8.75s, 2018    4,000    3,899,400
                                                                   -----------
                                                                  $ 29,614,813
------------------------------------------------------------------------------
Total Municipal Bonds                                             $448,023,193
------------------------------------------------------------------------------
Total Investments (Identified Cost, $420,651,437)                 $448,023,193
Other  Assets,  Less  Liabilities - 0.3%                             1,148,279
------------------------------------------------------------------------------
Net Assets - 100.0%                                               $449,171,472
------------------------------------------------------------------------------
+Restricted security.
++Security valued by or at the direction of the Trustees.
*Inverse floating rate security.
**Non-income producing security - in default.
#Indexed security.
##When-issued  security.  At March 31, 1995, the Fund had sufficient cash and/or
  securities at least equal to the value of the when-issued security.

See notes to financial statements



<PAGE>
FINANCIAL  STATEMENTS

Statement of Assets and Liabilities
------------------------------------------------------------------------------
March 31, 1995
------------------------------------------------------------------------------
Assets:
  Investments, at value (identified cost, $420,651,437)          $448,023,193
  Cash                                                                 56,499
  Receivable for investments sold                                   2,492,940
  Receivable for Fund shares sold                                     237,809
  Interest receivable                                               8,910,475
  Other assets                                                          6,957
                                                                 ------------
      Total assets                                               $459,727,873
                                                                 ------------
Liabilities:
  Distributions payable                                          $    877,910
  Payable for when-issued investments purchased                     8,000,000
  Payable for Fund shares reacquired                                1,461,848
  Payable to affiliates -
    Management fee                                                      9,525
    Shareholder servicing agent fee                                     2,650
    Distribution fee                                                   11,662
  Accrued expenses and other liabilities                              192,806
                                                                 ------------
      Total liabilities                                          $ 10,556,401
                                                                 ------------
Net assets                                                       $449,171,472
                                                                 ------------

Net assets consist of:
  Paid-in capital                                                $433,004,620
  Unrealized appreciation on investments                           27,371,756
  Accumulated net realized loss on investments                    (10,520,735)
  Accumulated distributions in excess of net investment income       (684,169)
                                                                 ------------
      Total                                                      $449,171,472
                                                                 ------------
Shares of beneficial interest outstanding                         52,435,142
                                                                 ------------
Class A shares:
  Net asset value and redemption price per share
    (net assets of $25,270,127 / 2,952,479 shares of beneficial
     interest outstanding)                                          $8.56
                                                                     ----
  Offering price per share (100/95.25)                              $8.99
                                                                     ----
Class B shares:
  Net asset value, offering price, and redemption price per
    share (net assets of $412,965,394 / 48,206,602 shares of
    beneficial interest outstanding)                                $8.57
                                                                     ----
Class C shares:
  Net asset value, offering price, and redemption price per
    share (net assets of $10,935,951 / 1,276,061 shares of
    beneficial interest outstanding)                                $8.57
                                                                     ----
On sales of $100,000 or more, the offering price of Class A shares is reduced. A
contingent  deferred  sales charge may be imposed on  redemptions of Class A and
Class B shares.

See notes to financial statements
<PAGE>
FINANCIAL  STATEMENTS

Statement  of  Operations
------------------------------------------------------------------------------
Year Ended March 31, 1995
------------------------------------------------------------------------------
Net investment income:
  Interest income                                                 $33,848,466
                                                                   ----------
  Expenses -
    Management fee                                                $ 3,545,246
    Trustees' compensation                                             40,748
    Shareholder servicing agent fee (Class A)                          13,323
    Shareholder servicing agent fee (Class B)                         977,825
    Shareholder servicing agent fee (Class C)                          14,272
    Distribution and service fee (Class B)                          4,444,656
    Distribution and service fee (Class C)                             95,149
    Custodian fee                                                     173,858
    Printing                                                           84,123
    Auditing fees                                                      60,684
    Postage                                                            43,309
    Legal fees                                                         26,048
    Miscellaneous                                                     373,477
                                                                   ----------
      Total expenses                                              $ 9,892,718
                                                                   ----------
        Net investment income                                     $23,955,748
                                                                   ----------
Realized and unrealized gain (loss) on investments:
  Realized gain (loss) (identified cost basis) -
    Investment transactions                                       $(9,519,481)
    Futures contracts                                                 723,362
                                                                   ----------
      Net realized loss on investments                            $(8,796,119)
                                                                   ----------
  Change in unrealized appreciation (depreciation) -
    Investments                                                   $ 8,378,273
    Futures contracts                                                (151,563)
                                                                   ----------
      Net unrealized gain on investments                          $ 8,226,710
                                                                   ----------
        Net realized and unrealized loss on investments           $  (569,409)
                                                                   ----------
          Increase in net assets from operations                  $23,386,339
                                                                   ----------
See notes to financial statements
<PAGE>

FINANCIAL  STATEMENTS - continued


<TABLE>
<CAPTION>
Statement  of  Changes  in  Net  Assets
------------------------------------------------------------------------------------------------------------------------------
                                                                Year Ended        Four Months Ended               Year Ended
                                                              March 31, 1995           March 31, 1994        November 30, 1993
------------------------------------------------------------------------------------------------------------------------------
<S>                                                          <C>                       <C>                       <C>
Increase in net assets:
From operations -
  Net investment income                                       $ 23,955,748             $  8,135,114              $ 24,569,248
  Net realized gain (loss) on investments                       (8,796,119)              (1,579,438)                2,174,746
  Net unrealized gain (loss) on investments                      8,226,710              (21,759,776)               19,852,443
                                                               -----------               -----------              -----------
    Increase (decrease) in net assets from operations         $ 23,386,339             $(15,204,100)             $ 46,596,437
                                                               -----------               -----------              -----------
Distributions declared to shareholders -
  From net investment income (Class A)                            (551,579)                 (24,388)                   (2,142)
  From net investment income (Class B)                         (22,598,713)              (6,513,043)              (25,152,570)
  From net investment income (Class C)                            (491,715)                 (36,953)                   --
  In excess of net investment income (Class A)                       --                        (444)                     (150)
  In excess of net investment income (Class B)                       --                  (1,488,102)               (1,560,580)
  In excess of net investment income (Class C)                       --                      (1,021)                   --
  From net realized gain on investments                              --                    (320,243)               (5,237,004)
  In excess of net realized gain on investments                     (2,000)              (1,230,985)                   --
                                                               -----------                ----------               ----------
    Total distributions declared to shareholders               (23,644,007)              (9,615,179)              (31,952,446)
                                                               -----------                ----------               ----------
Fund share (principal) transactions -
  Net proceeds from sale of shares                            $ 63,201,308             $ 31,229,236              $118,919,014
  Net asset value of shares issued to
    shareholders in reinvestment of
    distributions                                               12,855,706                5,241,616                18,199,816
  Cost of shares reacquired                                   (118,093,995)             (38,825,729)              (83,071,056)
                                                               -----------              -----------               -----------
     Increase (decrease) in net assets from
     Fund share transactions                                   (42,036,981)              (2,354,877)             $ 54,047,774
                                                               -----------               ---------                -----------
      Total increase (decrease) in net assets                  (42,294,649)             (27,174,156)             $ 68,691,765

Net assets:
  At beginning of period                                       491,466,121              518,640,277               449,948,512
                                                               -----------              -----------               -----------

  At end  of  period  (including  accumulated 
    distributions  in  excess  of  net investment
    income of $(684,169), $(1,489,567) and $(1,560,730),
    respectively)                                             $449,171,472             $491,466,121              $518,640,277
                                                               -----------              -----------               -----------
See notes to financial statements
</TABLE>
<PAGE>

FINANCIAL  STATEMENTS - continued

<TABLE>
<CAPTION>
Financial  Highlights
-----------------------------------------------------------------------------------------------------------------------
                                                    Year Ended           Year Ended     Year Ended     Year Ended
                                                      March 31,          November 30,   March 31,      November 30,
-----------------------------------------------------------------------  ------------   -------------  ------------
                                                      1995     1994<F1>    1993<F2>     1995     1994<F1>      1993
------------------------------------------------------------------------------------------------------------------------
                                                    Class A                     Class B
------------------------------------------------------------------------------------------------------------------------
Per share data (for a share outstanding throughout each period):
<S>                                                  <C>      <C>         <C>          <C>       <C>         <C>   
Net asset value - beginning of period                $ 8.56   $ 8.99      $ 9.15        $ 8.56   $ 8.99         $ 8.73

Income from investment operations<F4>
Net investment income                                $ 0.50   $ 0.15      $ 0.12        $ 0.44   $ 0.14         $ 0.42

Net realized and unrealized gain (loss)
  on investments                                       0.02    (0.51)      (0.16)         --      (0.51)          0.42
                                                       ----    -----       -----        ------    -----           ----
     Total from investment operations                $ 0.52   $(0.36)     $(0.04)       $ 0.44   $(0.37)        $ 0.84
                                                       ----     ----        ----          ----     ----           ----
Less distributions declared to shareholders --
   From net investment income                        $(0.52)  $(0.02)     $(0.11)       $(0.43)  $(0.01)        $(0.45)
   In excess of net investment income                   --       --        (0.01)         --       --            (0.03)
   From net realized gain on investments                --     (0.01)        --           --      (0.01)         (0.10)
   In excess of net realized gain on investments        --<F6> (0.04)        --           --      (0.04)           -- 
                                                       ----     ----        ----          ----     ----           ----
     Total distributions declared to shareholders    $(0.52)  $(0.07)     $(0.12)       $(0.43)  $(0.06)        $(0.58)
                                                       ----     ----        ----          ----     ----           ----
Net asset value - end of period                      $ 8.56   $ 8.56      $ 8.99        $ 8.57   $ 8.56         $ 8.99
                                                     ======   ======      ======        ======   ======         ======
Total Return<F5>                                       6.33%   (7.90)%<F3> (1.80)%<F3>    5.32%   (8.97)%<F3>     9.95%
Ratios (to average net assets)/Supplemental data:
  Expenses                                             1.13%    1.07%<F3>   0.76%<F3>     2.16%    2.24%<F3>      2.11%
  Net investment income                                6.20%    5.31%<F3>   4.94%<F3>     5.15%    4.74%<F3>      4.92%
Portfolio turnover                                       25%       9%         30%           25%       9%            30%
Net assets at end of period (000 omitted)           $25,270   $5,595      $  461      $412,965  $479,478      $518,179

<FN>
<F1>For the four-month period ended March 31, 1994.
<F2>For the period from the commencement of offering of Class A shares, September 7, 1993 to November 30, 1993.
<F3>Annualized.
<F4>Per share data for the periods subsequent to November 30, 1993 are based on average shares outstanding.
<F5>Total returns for Class A shares do not include the applicable sales charge.  If the charge had been
    included, the results would have been lower.
<F6>Distributions in excess of net realized gains were less than $0.01 per share.

</TABLE>
See notes to financial statements
<PAGE>



FINANCIAL  STATEMENTS - continued


Financial  Highlights - continued
<TABLE>
<CAPTION>

-----------------------------------------------------------------------------------------------------------------------------------
                                                                                                             Year Ended
                                               Year Ended November 30,                                       March 31,
-------------------------------------------------------------------------------------------------------      --------------------
                                                 1992     1991      1990     1989      1988     1987<F4>     1995      1994<F1>
-----------------------------------------------------------------------------------------------------------------------------------
                                               Class B                                                       Class C
-----------------------------------------------------------------------------------------------------------------------------------
Per share data (for a share outstanding throughout each period):
<S>                                            <C>       <C>      <C>       <C>       <C>       <C>          <C>      <C>     
Net asset value -  beginning of period         $  8.50   $ 8.25   $  8.41   $  8.11   $  7.67   $  8.47      $ 8.56   $   9.07
                                               -------   ------   -------   -------   -------   -------      ------   --------
Income from investment operations<F3> -
  Net investment income                        $  0.47   $ 0.49   $  0.49   $  0.51   $  0.50   $  0.38      $ 0.44   $   0.09
  Net realized and unrealized gain (loss)
    on investments                                0.26     0.25     (0.15)     0.30      0.43     (0.83)       0.01      (0.59)
                                                  ----     ----     -----      ----      ----     -----        ----      ----- 
    Total from investment operations           $  0.73   $ 0.74   $  0.34   $  0.81   $  0.93   $ (0.45)     $ 0.45   $  (0.50)
                                               -------   ------   -------   -------   -------   -------      ------   -------- 
Less distributions declared to shareholders -

  From net investment income                   $ (0.48)  $(0.49)  $ (0.50)  $ (0.51)  $ (0.49)   $(0.35)    $ (0.44)  $  (0.01)
  In excess of net investment income               --       --        --        --        --        --          --         --
  From paid-in capital                           (0.02)     --        --        --        --        --          --         --
                                               -------   ------   -------   -------   -------   -------      ------   -------- 
    Total distributions declared 
      to shareholders                          $ (0.50)  $(0.49)  $ (0.50)  $ (0.51)  $ (0.49)  $ (0.35)     $(0.44)   $ (0.01)
                                               -------   ------   -------   -------   -------   -------      ------   -------- 
Net asset value - end of period                $  8.73   $ 8.50   $  8.25   $  8.41   $  8.11   $  7.67      $ 8.57    $  8.56

Total return                                      8.82%    9.21%     4.18%    10.24%    12.53%    (5.79)%<F2>  5.39%    (19.42)%<F2>
                                                  ====     ====      ====     =====     =====     =====        ====     ====== 

Ratios (to average net assets)/
  Supplemental data:
    Expenses                                      2.03%    2.04%     2.05%     2.07%     2.09%     2.03%<F2>   2.09%      2.18%<F2>
    Net investment income                         5.50%    5.82%     5.99%     6.09%     6.38%     6.00%<F2>   5.23%      4.62%<F2>
Portfolio turnover                                  52%      73%       91%      127%      171%      138%         25%         9%
Net assets at end of period
  (000 omitted)                                $449,949 $409,084  $379,239  $343,887  $244,825  $183,935     $10,936    $ 6,393

<F1>For the period from the  commencement of offering of Class C shares, January 3, 1994 to March 31, 1994.
<F2>Annualized.
<F3>Per share data for the periods subsequent to November 30, 1993 are based on average shares outstanding.
<F4>For the  period  from the  commencement  of  investment  operations, December 29, 1986 to November 30, 1987.
</TABLE>

See notes to financial statements
<PAGE>


NOTES  TO  FINANCIAL  STATEMENTS

(1) Business  and  Organization
MFS Municipal  Income Fund (the Fund) is a  diversified  series of MFS Municipal
Series Trust (the Trust).  The Trust is  organized as a  Massachusetts  business
trust and is registered under the Investment Company Act of 1940, as amended, as
an open-end management investment company. During 1993 the Fund changed its year
end from November 30 to March 31.

(2) Significant  Accounting  Policies
Investment Valuations - Debt securities (other than short-term obligations which
mature in 60 days or less),  including listed issues and forward contracts,  are
valued on the basis of valuations  furnished by dealers or by a pricing  service
with  consideration  to factors  such as  institutional-size  trading in similar
groups of securities,  yield,  quality,  coupon rate,  maturity,  type of issue,
trading  characteristics  and other market data, without exclusive reliance upon
exchange or over-the-counter prices.  Short-term obligations, which mature in 60
days or less, are valued at amortized cost, which  approximates  value.  Futures
contracts,  options  and  options on  futures  contracts  listed on  commodities
exchanges are valued at closing settlement prices.  Over-the-counter options are
valued by brokers  through the use of a pricing  model which takes into  account
closing bond valuations,  implied  volatility and short-term  repurchase  rates.
Securities  for which there are no such  quotations or valuations  are valued at
fair value as determined in good faith by or at the direction of the Trustees.

Repurchase  Agreements  - The Fund may enter  into  repurchase  agreements  with
institutions that the Fund's investment adviser has determined are creditworthy.
Each  repurchase  agreement  is recorded  at cost.  The Fund  requires  that the
securities purchased in a repurchase transaction be transferred to the custodian
in a manner  sufficient  to enable the Fund to obtain  those  securities  in the
event of a default under the repurchase agreement. The Fund monitors, on a daily
basis,  the  value of the  securities  transferred  to  ensure  that the  value,
including accrued interest, of the securities under each repurchase agreement is
greater than amounts owed to the Fund under each such repurchase agreement.

Written  Options  - The Fund may write  covered  call or put  options  for which
premiums  are received and are  recorded as  liabilities,  and are  subsequently
adjusted to the current  value of the options  written.  Premiums  received from
writing  options which expire are treated as realized gains.  Premiums  received
from writing  options which are  exercised or are closed are offset  against the
proceeds or amount paid on the  transaction  to determine  the realized  gain or
loss.  If a put option is exercised,  the premium  reduces the cost basis of the
security  purchased by the Fund.  The Fund, as writer of an option,  may have no
control  over  whether the  underlying  security may be sold (call) or purchased
(put) and, as a result,  bears the market risk of an  unfavorable  change in the
price of the securities underlying the written option. In general,  written call
options  may  serve  as a  partial  hedge  against  decreases  in  value  in the
underlying securities to the extent of the premium received. Written options may
also be used as a part of an  income-producing  strategy  reflecting the view of
the Fund's management on the direction of interest rates.

Futures  Contracts - The Fund may enter into financial futures contracts for the
delayed  delivery of  securities  at a fixed price on a future date. In entering
such contracts,  the Fund is required to deposit either in cash or securities an
amount equal to a certain percentage of the contract amount. Subsequent payments
are made or received by the Fund each day,  depending on the daily  fluctuations
in the  value  of the  underlying  security,  and  are  recorded  for  financial
statement  purposes  as  unrealized  gains or  losses by the  Fund.  The  Fund's
investment  in  financial   futures  contracts  is  designed  to  hedge  against
anticipated  future  changes  in  interest  rates or  securities  prices  or for
non-hedging  purposes.  For  example,  interest  rate  futures  may be  used  in
modifying  the  duration  of the  portfolio  without  incurring  the  additional
transaction  costs  involved in buying and selling  the  underlying  securities.
Should interest rates or securities prices move  unexpectedly,  the Fund may not
achieve the  anticipated  benefits of the  financial  futures  contracts and may
realize a loss.

Security Loans - The Fund may lend its securities to member banks of the Federal
Reserve  System  and  to  member  firms  of  the  New  York  Stock  Exchange  or
subsidiaries  thereof.  The  loans  are  collateralized  at all times by cash or
securities  with a market value at least equal to the market value of securities
loaned. As with other extensions of credit,  the Fund may bear the risk of delay
in recovery or even loss of rights in the collateral  should the borrower of the
securities  fail  financially.  The Fund receives  compensation  for lending its
securities  in the  form of fees or from all or a  portion  of the  income  from
investment of the collateral. The Fund would also continue to earn income on the
securities loaned. At March 31, 1995, the Fund had no securities on loan.

Investment Transactions and Income - Investment transactions are recorded on the
trade date.  Interest  income is recorded on the accrual basis.  All premium and
original issue  discount are amortized or accreted for both financial  statement
and tax  reporting  purposes  as  required  by federal  income tax  regulations.
Interest  payments  received  in  additional  securities  are  recorded  on  the
ex-interest date in an amount equal to the value of the security on such date.

The Fund uses the effective  interest  method for reporting  interest  income on
payment-in-kind  (PIK) bonds,  whereby  interest income on PIK bonds is recorded
ratably  by the Fund at a  constant  yield to  maturity.  Legal  fees and  other
related expenses  incurred to preserve and protect the value of a security owned
are added to the cost of the security;  other legal fees are  expensed.  Capital
infusions, which are generally non-recurring, incurred to protect or enhance the
value of  high-yield  debt  securities,  are reported as an addition to the cost
basis of the  security.  Costs  that are  incurred  to  negotiate  the  terms or
conditions  of capital  infusions  or that are  expected  to result in a plan of
reorganization  are  considered  workout  expenses  and are reported as realized
losses.  Ongoing costs  incurred to protect or enhance an  investment,  or costs
incurred to pursue  other  claims or legal  actions,  are  reported as operating
expenses.

Tax  Matters  and  Distributions  - The  Fund's  policy  is to  comply  with the
provisions  of the  Internal  Revenue  Code (the Code)  applicable  to regulated
investment  companies and to distribute to  shareholders  all of its net taxable
income,  including  any  net  realized  gain  on  investments.  Accordingly,  no
provision  for federal  income or excise tax is  provided.  The Fund files a tax
return annually using tax accounting  methods  required under  provisions of the
Code which may differ from generally accepted accounting  principles,  the basis
on which these financial statements are prepared. Accordingly, the amount of net
investment  income and net realized gain reported on these financial  statements
may differ from that  reported on the Fund's tax return and,  consequently,  the
character of distributions to shareholders  reported in the financial highlights
may differ from that reported to shareholders on Form 1099-DIV. Distributions to
shareholders are recorded on the ex-dividend date.

Distributions  paid  by the  Fund  from  net  interest  received  on  tax-exempt
municipal  bonds are not includable by  shareholders as gross income for federal
income tax purposes because the Fund intends to meet certain requirements of the
Code applicable to regulated investment companies, which will enable the Fund to
pay exempt-interest  dividends. That portion of such interest, if any, earned on
private  activity  bonds issued after  August 7, 1986,  may be  considered a tax
preference item to shareholders.

The Fund  distinguishes  between  distributions  on a tax basis and a  financial
reporting  basis and  requires  that only  distributions  in excess of tax basis
earnings and profits are  reported in the  financial  statements  as a return of
capital.  Differences in the recognition or classification of income between the
financial  statements  and tax  earnings  and profits  which result in temporary
over-distributions   for  financial  statement   purposes,   are  classified  as
distributions  in excess of net investment  income or  accumulated  net realized
gains.  During the year ended March 31, 1995, $491,631 and $26 were reclassified
from  accumulated  undistributed  net realized gain on  investments  and paid-in
capital,  respectively,  to accumulated net investment income due to differences
between book and tax accounting.  This change had no effect on the net assets or
net asset value per share.

Multiple  Classes of Shares of  Beneficial  Interest - The Fund offers  Class A,
Class B and Class C shares. Class A and Class C shares were first offered to the
public on September 7, 1993 and January 3, 1994, respectively. The three classes
of shares differ in their respective  shareholder servicing agent,  distribution
and service  fees.  Shareholders  of each class also bear certain  expenses that
pertain only to that particular class. All shareholders bear the common expenses
of the Fund pro rata  based on the  average  daily  net  assets  of each  class,
without distinction between share classes. Dividends are declared separately for
each class. No class has preferential dividend rights;  differences in per share
dividend  rates are generally due to  differences  in separate  class  expenses,
including distribution and shareholder service fees.

(3) Transactions  with  Affiliates
Investment  Adviser  - The  Fund  has  an  investment  advisory  agreement  with
Massachusetts  Financial  Services  Company (MFS) to provide overall  investment
advisory and administrative  services,  and general office facilities.  Prior to
September 1, 1993,  Lifetime Advisors,  Inc. (LAI), a wholly owned subsidiary of
MFS, was the investment adviser for the Fund. The management fee, computed daily
and paid  monthly at an  effective  annual  rate of 0.30% of  average  daily net
assets and 6.43% of investment income, amounted to $3,545,246 for the year ended
March 31, 1995.

The Fund pays no  compensation  directly to its Trustees who are officers of the
investment adviser, or to officers of the Fund, all of whom receive remuneration
for their services to the Fund from MFS. Certain of the officers and Trustees of
the Fund are  officers or directors of LAI,  MFS,  MFS Fund  Distributors,  Inc.
(MFD) and MFS Service  Center,  Inc.  (MFSC).  The Fund has an unfunded  defined
benefit  plan  for  all  its   independent   Trustees.   Included  in  Trustees'
compensation  is a net  periodic  pension  expense of $11,398 for the year ended
March 31, 1995.

Distributor - MFD, a wholly owned  subsidiary of MFS, as  distributor,  received
$9,957  as its  portion  of the  sales  charge on sales of Class A shares of the
Fund. The Trustees have adopted separate distribution plans for Class A, Class B
and Class C shares pursuant to Rule 12b-1 of the Investment  Company Act of 1940
as follows:

The Class A  Distribution  Plan  provides that the Fund will pay MFD up to 0.35%
per annum of its  average  daily net  assets  attributable  to Class A shares in
order  that  MFD  may  pay  expenses  on  behalf  of  the  Fund  related  to the
distribution  and servicing of its shares.  These expenses include a service fee
to each  securities  dealer that enters into a sales agreement with MFD of up to
0.25% per annum of the Fund's average daily net assets  attributable  to Class A
shares which are  attributable to that securities  dealer, a distribution fee to
MFD of up to 0.10% per annum of the Fund's average daily net assets attributable
to Class A shares,  commissions to dealers and payments to MFD  wholesalers  for
sales at or above a certain  dollar level,  and other such  distribution-related
expenses  that are  approved  by the  Fund.  Payments  will  commence  under the
distribution  plan on such date that the net assets of the Fund  attributable to
Class A shares first equals or exceeds $40 million.

The Class B and Class C Distribution  Plans provide that the Fund will pay MFD a
monthly  distribution fee, equal to 0.75% per annum, and a quarterly service fee
of up to 0.25% per annum, of the Fund's average daily net assets attributable to
Class B and Class C shares. MFD will pay to securities dealers that enter into a
sales  agreement with MFD, all or a portion of the service fee  attributable  to
Class B and Class C shares,  and will pay to such securities  dealers all of the
distribution fee attributable to Class C shares.  The service fee is intended to
be additional  consideration for services rendered by the dealer with respect to
Class B and Class C shares.  Fees incurred under the  distribution  plans during
the  year  ended  March  31,  1995  were  1.00%  of  average  daily  net  assets
attributable  to Class B and Class C shares on an annualized  basis and amounted
to  $4,444,656  and $95,149,  respectively  (of which MFD  retained  $68,521 and
$4,741, respectively).

A contingent  deferred  sales charge is imposed on  shareholder  redemptions  of
Class  A  shares,  on  purchases  of $1  million  or  more,  in the  event  of a
shareholder  redemption  within twelve months  following the share  purchase.  A
contingent deferred sales charge is imposed on shareholder  redemptions of Class
B shares in the event of a shareholder  redemption within six years of purchase.
MFD receives all contingent  deferred sales charges.  Contingent  deferred sales
charges  imposed  during the year ended March 31, 1995 were $708,357 for Class B
shares.

Shareholder  Servicing  Agent - MFSC, a wholly owned  subsidiary of MFS,  earned
$13,323,  $977,825  and  $14,272  for  Class  A,  Class B and  Class  C  shares,
respectively,  for its  services  as  shareholder  servicing  agent.  The fee is
calculated  as a  percentage  of the  average  daily net assets of each class of
shares at an effective  annual rate of up to 0.15%,  up to 0.22% and up to 0.15%
attributable to Class A, Class B and Class C shares, respectively.

(4) Portfolio Securities
Purchases  and sales of  investments,  other  than U.S.  government  securities,
purchased   option   transactions   and   short-term   obligations,   aggregated
$116,193,500 and $155,479,893, respectively.

The cost and unrealized appreciation or depreciation in value of the investments
owned by the Fund, as computed on a federal income tax basis, are as follows:

Aggregate cost                                             $420,651,437
                                                           -------------
Gross unrealized appreciation                              $ 29,459,510
Gross unrealized depreciation                                (2,087,754)
                                                           -------------
  Net unrealized appreciation                              $ 27,371,756
                                                           -------------

At March 31, 1995, the Fund, for federal income tax purposes, had a capital loss
carryforward  of  ($7,934,343),  which may be applied  against  any net  taxable
realized gains of each  succeeding  year until the earlier of its utilization or
expiration on March 31, 2002 ($1,415,952) and March 31, 2003 ($6,518,391).

(5) Shares  of  Beneficial Interest
The Fund's  Declaration  of Trust  permits the  Trustees  to issue an  unlimited
number of full and fractional shares of beneficial interest (without par value).
Transactions in Fund shares were as follows:


<TABLE>
<CAPTION>
Class A Shares
                            Year Ended                           Year Ended                           Period Ended
                            March 31, 1995                       March 31, 1994<F1>                November 30, 1993<F2>
                            -------------------------      -----------------------------      ---------------------------
                            Shares       Amount             Shares       Amount               Shares          Amount
-------------------------------------------------------------------------------------------------------------------------
<S>                         <C>          <C>                <C>          <C>                  <C>          <C>         
Shares sold                 2,767,565    $ 23,341,811       766,727      $  6,792,015         51,270       $    466,122
Shares issued to
 shareholders in
 reinvestment of
 distributions                 17,884         151,011         1,368            12,126            134              1,211
Shares reacquired            (486,722)     (4,100,978)     (165,634)       (1,507,352)          (113)            (1,021)
                            ---------     -----------      --------       ------------         ------       ------------
  Net increase              2,298,727    $ 19,391,844       602,461      $  5,296,789         51,291       $    466,312
                            =========    ============       =======      ============         ======       ============

<CAPTION>
Class B Shares
                            Year Ended                     Year Ended                     Year Ended
                            March 31, 1995                 March 31, 1994<F1>             November 30, 1993
                            -------------------------      -----------------------------  --------------------------------
                            Shares       Amount             Shares          Amount            Shares          Amount
----------------------------------------------------------------------------------------  --------------------------------
<S>                         <C>          <C>              <C>            <C>              <C>              <C>       
Shares sold                 3,236,637    $ 27,296,462     1,771,398      $ 16,008,151     13,299,141       $118,452,892
Shares issued to
 shareholders in
 reinvestment of
 distributions              1,465,533      12,377,112       581,143         5,207,213      2,056,699         18,198,605
Shares reacquired         (12,503,667)   (105,578,609)   (3,964,973)      (35,578,939)    (9,277,213)       (83,070,035)
                           ----------     ------------    ----------      -----------     ----------       ------------
  Net increase (decrease)  (7,801,497)   $(65,905,035)   (1,612,432)     $(14,363,575)     6,078,627       $ 53,581,462
                           ==========    ============    ==========      ============      =========       ============

<CAPTION>
Class C Shares
                            Year Ended                     Year Ended
                            March 31, 1995                 March 31, 1994<F3>
                            -------------------------      -----------------------------
                            Shares            Amount        Shares          Amount
----------------------------------------------------------------------------------------
<S>                         <C>          <C>                <C>          <C>    
Shares sold                 1,490,674    $ 12,563,035       940,881      $  8,429,070
Shares issued to
 shareholders in
 reinvestment of
 distributions                 38,763         327,583         2,564            22,277
Shares reacquired            (999,873)     (8,414,408)     (196,948)       (1,739,438)
                              -------      ------------     -------         ---------
  Net increase                529,564    $  4,476,210       746,497      $  6,711,909
                              =======      ==========       =======      ============
                            
<FN>
<F1>For the four months ended March 31, 1994.
<F2>For the period from the commencement of offering of Class A shares, September 7, 1993 to November 30, 1993.
<F3>For the period from the commencement of offering of Class C shares, January 3, 1994 to March 31, 1994.
</TABLE>

(6)  Line  of  Credit
The Fund entered into an agreement  which enables it to  participate  with other
funds  managed by MFS, or an affiliate  of MFS, in an  unsecured  line of credit
with  a  bank  which  permits  borrowings  up  to  $350  million,  collectively.
Borrowings  may be made to  temporarily  finance the  repurchase of Fund shares.
Interest is charged to each fund,  based on its  borrowings,  at a rate equal to
the bank's base rate. In addition,  a commitment fee, based on the average daily
unused portion of the line of credit, is allocated among the participating funds
at the end of each  quarter.  The  commitment  fee allocated to the Fund for the
year ended March 31, 1995 was $7,371.

(7)  Financial  Instruments
The Fund  invests in indexed  securities  whose  value may be linked to interest
rates,  commodities,  indices or other financial indicators.  Indexed securities
are  fixed-income  securities  whose  proceeds  at  maturity  (principal-indexed
securities)  or  interest  rates  (coupon-indexed   securities)  rise  and  fall
according to the change in one or more specified underlying instruments. Indexed
securities  may be more  volatile than the  underlying  instrument  itself.  The
following is a summary of such securities held at March 31, 1995:


Coupon-Indexed Securities
                                      Principal                   Unrealized
Description              Index        (000 Omitted)   Value       Appreciation
------------------------------------------------------------------------------
Rio Grande Valley, TX,
 Health Facilities
 Development Corp.,
 7.72s, 2015             J.J. Kenny   $2,800          $2,841,749  $74,985
                                                                  -------

(8)  Restricted Securities
The Fund may invest not more than 15% of its total  assets in  securities  which
are subject to legal or contractual  restrictions on resale.  At March 31, 1995,
the Fund owned the  following  restricted  security  (constituting  0.27% of net
assets) which may not be publicly sold without registration under the Securities
Act of 1933.  The Fund does not have the right to demand  that such  security be
registered. The value of this security is determined by valuations supplied by a
pricing  service  or  brokers.  This  security  may  be  offered  to  "qualified
institutional buyers" under Rule 144A of the 1933 Act.


                      Date of        Par Amount
Description           Acquisition    (000 Omitted)    Cost        Value
--------------------------------------------------------------------------
Crystal City, TX,
 Lease Obligations,
 10.5s, 2008           5/25/88          $1,252      $948,056    $1,197,172
                                                                ----------
<PAGE>


INDEPENDENT  AUDITORS'  REPORT

To the Trustees of MFS Municipal  Series Trust and Shareholders of MFS Municipal
Income  Fund:  We  have  audited  the  accompanying   statement  of  assets  and
liabilities,  including the portfolio of  investments,  of MFS Municipal  Income
Fund (one of the series constituting MFS Municipal Series Trust) as of March 31,
1995, the related statement of operations for the year then ended, the statement
of changes in net assets for the year  ended  March 31,  1995,  the four  months
ended March 31, 1994 and the year ended  November  30, 1993,  and the  financial
highlights  for the year ended March 31,  1995,  the four months ended March 31,
1994 and each of the years in the  seven-year  period  ended  November 30, 1993.
These financial  statements and financial  highlights are the  responsibility of
the  Fund's  management.  Our  responsibility  is to express an opinion on these
financial statements and financial highlights based on our audits.

We  conducted  our  audits  in  accordance  with  generally   accepted  auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable  assurance  about  whether the  financial  statements  and  financial
highlights are free of material misstatement.  An audit includes examining, on a
test basis,  evidence  supporting  the amounts and  disclosures in the financial
statements.  Our procedures  included  confirmation  of the securities  owned at
March 31, 1995 by correspondence  with the custodian and brokers;  where replies
were not received from brokers, we performed other auditing procedures. An audit
also includes assessing the accounting principles used and significant estimates
made by  management,  as well as  evaluating  the  overall  financial  statement
presentation.  We believe  that our audits  provide a  reasonable  basis for our
opinion.

In our opinion,  such  financial  statements  and financial  highlights  present
fairly, in all material respects, the financial position of MFS Municipal Income
Fund at March 31, 1995,  the results of its  operations,  the changes in its net
assets,  and its  financial  highlights  for the  respective  stated  periods in
conformity with generally accepted accounting principles.

DELOITTE & TOUCHE LLP


Boston, Massachusetts
May 5, 1995

                ---------------------------------------------

This  report is prepared  for the general  information  of  shareholders.  It is
authorized  for  distribution  to  prospective  investors  only when preceded or
accompanied by a current prospectus.

<PAGE>


MFS MUNICIPAL
INCOME FUND

500 Boylston Street
Boston, MA 02116

MFS(SM)
THE FIRST NAME IN MUTUAL FUNDS

Bulk Rate
U.S. Postage
P A I D
Permit #55638
Boston, MA



MMI-2 5/95 21.5M 02/202/302






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