November 15, 1999

Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, D.C. 20549
Attn:    Ms. Laura J. Riegel
         Division of Investment Management

         Re:      Withdrawal of Post-Effective Amendment No. 15
                  to the Registration Statement under the Securities
                  Act of 1933 of Cash Account Trust
                  File Nos. 33-32476 and 811-5970
                  -------------------------------

Dear Ms. Riegel:

         Pursuant to Rule 477(a) under the Securities Act of 1933, as amended
(the "1933 Act"), Cash Account Trust (the "Trust") hereby applies to withdraw
Post-Effective Amendment No. 15 ("PEA 15") to its registration statement under
the 1933 Act that was filed on November 12, 1999 (the "Amendment"). The
Amendment was filed for the purpose of designating a new effective date from
that indicated in Post-Effective Amendment No. 14, as filed with the Commission
on September 3, 1999. Due to problems with the EDGAR system on November 10,
1999, PEA 15 was not filed on EDGAR form type 485BXT until after the previously
filed amendment went effective, thereby preventing the designation of a new
effective date. However, the Trust states that it has never made a public
offering of securities of the share classes being registered; that the share
classes are not now nor have they ever been active; and that neither share class
has any assets, known liabilities or pending claims. The Trust believes that
withdrawal of this Amendment would be consistent with the public interest and
the protection of investors, and intends to file a new post-effective amendment
prior to a public offering of those share classes.

         Please contact Greg Pottle at (617) 295-3033 with any questions you may
have concerning the foregoing.


                                                    Very truly yours,



                                                    /s/Philip J. Collora
                                                    -----------------------
                                                    Philip J. Collora
                                                    Vice President and Secretary
                                                    Cash Account Trust