MFS SERIES TRUST IV, 497J, 1999-01-04

MFS SERIES TRUST IV
497J, 1999-01-04

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                             MFS(R) SERIES TRUST IV
               500 Boylston Street Boston Massachusetts 02116-3741
                                  617 954 5000




                                        January 4, 1999

VIA EDGAR
Securities and Exchange Commission
Judiciary Plaza
450 Fifth Street, NW
Washington, DC  20549

         Re:    MFS(R) Series Trust IV (the "Trust") (File Nos. 2-54607 and 
                811-2594) on behalf of:
                    MFS(R) Money Market Fund
                    MFS(R) Government Money Market Fund
                    MFS(R) Municipal Bond Fund and
                    MFS(R) Mid Cap Growth Fund

Ladies and Gentlemen:

         Pursuant to Rule 497(j) under the  Securities  Act of 1933, as amended,
please accept this letter as certification  that the Prospectuses and Statements
of Additional  Information  for the Trust do not differ from those  contained in
Post-Effective  Amendment No. 33 (the  "Amendment") to the Trust's  Registration
Statement on Form N-1A. This Amendment was filed  electronically on November 30,
1998.

         Please call the  undersigned or Nicole E. Leonard at (617) 954-5000 or
(800) 343-2829 with any questions you may have.

                                        Very truly yours,



                                        JAMES R. BORDEWICK, JR.
                                        James R. Bordewick, Jr.
                                        Assistant Secretary

JRB/bjn