MFS SERIES TRUST IX /MA/, 497J, 1996-08-30

MFS SERIES TRUST IX /MA/
497J, 1996-08-30

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                               MFS SERIES TRUST IX
             500 BOYLSTON STREET o BOSTON o MASSACHUSETTS 02116-3741
                                 617 o 954-5000




                                            August 30, 1996




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

         Re       MFS Series Trust IX (the "Trust") (File No. 2-50409) on
Behalf of MFS Bond Fund, MFS Limited Maturity Fund and MFS Municipal Limited
Maturity 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 MFS Series  Trust IX do not  differ  from those
contained in  Post-Effective  Amendment No. 33 (the  "Amendment") to the Trust's
Registration  Statement on Form N-1A. The Amendment was filed  electronically on
August 27, 1996.

         If you have any questions  concerning  the  foregoing,  please call the
undersigned or Sharon Julius-Doucette at (800) 343-2829.

                                            Very truly yours,


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

JRB/bjn