MFS SERIES TRUST IX /MA/, 497J, 1997-09-02

MFS SERIES TRUST IX /MA/
497J, 1997-09-02

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                               MFS SERIES TRUST IX
               500 Boylston Street Boston Massachusetts 02116-3741
                                  617 954 5000




                                            September 2, 1997



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)

Ladies and Gentlemen:

         Pursuant to Rule 497(j) under the  Securities  Act of 1933, as amended,
please accept this letter as certification  that the Prospectus and Statement of
Additional  Information  for the Trust do not  differ  from those  contained  in
Post-Effective  Amendment No. 34 (the  "Amendment") to the Trust's  Registration
Statement on Form N-1A.  The  Amendment was filed  electronically  on August 27,
1997.

         Please  call  the   undersigned  or  Michelle  M.  Wratschko  at  (617)
954-5192 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