MFS SERIES TRUST IV, 497J, 2001-01-03

MFS SERIES TRUST IV
497J, 2001-01-03

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                    MASSACHUSETTS FINANCIAL SERVICES COMPANY
              500 BOYLSTON STREET, BOSTON, MASSACHUSETTS 02116-3741
                                 (617) 954-5000




                                        January 3, 2001

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 ("MMM")
                 MFS(R)Government Money Market Fund ("MMG")
                 MFS(R)Municipal Bond Fund ("MMB")
                 MFS(R)Mid Cap Growth Fund ("OTC")

Ladies and Gentlemen:

         Pursuant to Rule 497(j) under the  Securities  Act of 1933, as amended,
please  accept  this  letter on behalf  of the Trust as  certification  that the
Prospectuses  and  Statements  of  Additional  Information  for the Trust do not
differ from those contained in Post-Effective Amendment No. 35 for MMM, MMG, MMB
and OTC (the  "Amendment") to the Trust's  Registration  Statement on Form N-1A.
This Amendment was filed  electronically  on December 29, 2000 for MMM, MMG, MMB
and OTC.

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

                                        Very truly yours,




                                        HEATHER R. GIROLAMO
                                        Heather R. Girolamo
                                        Associate Counsel

HRG/bjn