MFS MUNICIPAL SERIES TRUST
497, 1996-01-04
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                    MFS Mississippi Municipal Bond Fund

                 Supplement to the Prospectus dated June 1, 1995

The  section  of the  Prospectus  entitled  "Synopsis"  with  respect to the MFS
Mississippi Municipal Bond Fund is hereby revised as follows:

1.  SYNOPSIS

Expense Summary
Shareholder Transaction Expenses:                         Class A      Class B
Maximum Initial Sales Charge Imposed on
 Purchases of Fund Shares (as a percentage
 of offering price)..................................      4.75%        0.00%

Maximum Contingent Deferred Sales
 Charge (as a percentage of original
 purchase price or redemption proceeds,
 as applicable)......................................   See Below(1)    4.00%

The  Following  Annual  Operating  Expenses  for  Each  Class of  Shares  of the
Mississippi Fund are Shown After  Applicable Fee Reductions and  Reimbursements,
as Described in the Footnotes

Annual Operating Expenses of the Fund (as a percentage of average net assets):

                                                     Class A          Class B

Management Fees..............................        0.50%(2)         0.50%(2)
Rule 12b-1 Fees..............................        0.00%(3)         0.80%(4)
Other Expenses...............................        0.10%(5)         0.17%(5)
                                                
Total Operating Expenses.....................        0.60%(6)         1.47%(6)
 .........

(1)  Purchases of $1 million or more are not subject to an initial sales charge;
     however,  a contingent  deferred sales charge of 1% will be imposed on such
     purchases in the event of certain redemption  transactions within 12 months
     following such purchases (see "Purchases" below).

(2)  The Adviser has  voluntarily  reduced  the  management  fee to 0.50% of the
     Mississippi Fund's average daily net assets;  this fee will revert to 0.55%
     commencing on April 1, 1996. Absent this reduction, "Management Fees" would
     have been 0.55% (see "Management of the Trust" below).

(3)  The Mississippi Fund has adopted a distribution plan for its Class A shares
     in accordance with Rule 12b-1 under the Investment  Company Act of 1940, as
     amended   (the   "1940   Act"),   which   provides   that   it   will   pay
     distribution/service  fees  aggregating up to (but not  necessarily all of)
     0.35%  per  annum of the net  assets  of the Fund  attributable  to Class A
     shares (see "Distribution Plans" below).  Currently, the fees payable under
     the Class A Distribution Plan are not being imposed.  Such fees will become
     payable on such date or dates as the  Trustees of the Trust may  determine.
     Distribution  expenses paid under the Plan, together with the initial sales
     charge, may cause long-term shareholders to pay more than the maximum sales
     charge that would have been  permissible if imposed  entirely as an initial
     sales charge.

(4)  The Mississippi Fund has adopted a distribution plan for its Class B shares
     in accordance  with Rule 12b-1 under the 1940 Act,  which  provides that it
     will pay  distribution/service  fees aggregating up to (but not necessarily
     all of) 1.00% per annum of the average daily net assets attributable to the
     Class B shares (see "Distribution Plans" below).  Except in the case of the
     0.25% per annum  first year  service  fee,  service  fees under the Class B
     Distribution  Plan will become  payable on such date as the Trustees of the
     Trust may determine.  Distribution  expenses paid under the Plan,  together
     with  any  CDSC  payable  upon  redemption  of Class B  shares,  may  cause
     long-term shareholders to pay more than the maximum sales charge that would
     have been permissible if imposed entirely as an initial sales charge.

(5)  The Adviser has agreed to pay "Other  Expenses" of the Mississippi Fund for
     a period of time,  subject to reimbursement by the Fund. To accomplish such
     reimbursement,  the Adviser is entitled to receive an  additional  fee from
     the Fund equal to 0.40% per annum of the  average  daily net assets of each
     of the  Class A shares  and Class B shares of the  Fund.  The  Adviser  has
     voluntarily  reduced this expense  reimbursement fee to 0.10% and 0.17% per
     annum of the average daily net assets of the Class A shares and the Class B
     shares, respectively,  of the Fund. Such fee for the Class A shares will be
     increased  to 0.20% per annum on April 1, 1996,  to 0.30% per annum on July
     1,  1996 and to 0.33%  per  annum on  October  1, 1996 and such fee for the
     Class B shares will be  increased  to 0.27% per annum on April 1, 1996,  to
     0.37% per annum on July 1, 1996 and to 0.40% per annum on  October  1, 1996
     (see "Expenses" below).  Absent this expense arrangement,  "Other Expenses"
     would  have been  0.36% and 0.43% per annum for Class A shares  and Class B
     shares, respectively.

(6)  Absent a reduction in the  Mississippi  Fund's  management fees and expense
     reimbursement arrangement, "Total Operating Expenses" would have been 0.91%
     and 1.78% per annum for Class A shares and Class B shares, respectively.

                               Example Of Expenses

An investor would pay the following  dollar amount of expenses on a hypothetical
$1,000 investment in the Mississippi Fund, assuming (a) 5% annual return and (b)
redemption at the end of each of the time periods  indicated  (unless  otherwise
noted):

Period                            Class A          Class B
                                                         (1)
1 year.....................        $53          $ 55    $ 15
3 years....................         66            76      46
5 years....................         79           100      80
10 years...................        119           152(2)  152(2)

- --------------------------
(1)      Assumes no redemption.

(2)      Class B shares  convert  to Class A shares  approximately  eight  years
         after purchase; therefore, years nine and ten reflect Class A expenses.

The  "Example"  set forth above  reflects the  imposition  of the maximum  sales
charge and should not be considered a representation  of past or future expenses
of the Fund; actual expenses may be greater or less than shown.

                                         * * *

Page 63 of the  Prospectus is hereby  revised to delete the two sentences in the
section entitled  "Expenses"  stating that the Adviser is entitled to receive an
expense  reimbursement  fee from  certain  Funds equal to 0.40% per annum of the
average daily net assets of such Fund and that MFS has voluntarily  reduced such
fee to 0.00% per annum for an indefinite period. These sentences are replaced in
their entirety as follows:

"To accomplish such reimbursement, the Adviser is entitled to receive an expense
reimbursement  fee from each  such  Fund in  addition  to the  management  fees,
computed and paid  monthly at the annual rate of 0.40% of the average  daily net
assets of each of the Class A shares  and the Class B shares of the Fund for the
Fund's  then-current  fiscal year, with a limitation that immediately  after any
such  payment the  aggregate  expenses of each of the Class A shares and Class B
shares of such Fund, including the management fee but excluding any Distribution
Plan fees,  will not exceed 0.95% of its average  daily net assets.  The Adviser
has  voluntarily  reduced its expense  reimbursement  fee to 0.00% for each such
Fund (other than the Mississippi Fund) for an indefinite period. With respect to
the  Mississippi   Fund,  the  Adviser  has  voluntarily   reduced  its  expense
reimbursement  fee to 0.10% and 0.17% per annum of the average  daily net assets
of the Class A shares and Class B shares, respectively. Such fee for the Class A
shares will be increased to 0.20% per annum on April 1, 1996, to 0.30% per annum
on July 1, 1996 and to 0.33% per annum on October 1, 1996,  and such fee for the
Class B shares will be increased  to 0.27% per annum on April 1, 1996,  to 0.37%
per annum on July 1, 1996 and to 0.40% per annum on October 1, 1996."

                 The date of this  Supplement is January 1, 1996.


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