Exhibit (b)

                      IXIS Advisor Cash Management Trust
                           Section 906 Certification

   In connection with the report on Form N-CSR for the period ended December31,
2005 for the Registrant (the "Report"), the undersigned each hereby certifies
to the best of his knowledge, pursuant to section 906 of the Sarbanes-Oxley Act
of 2002, that:

   1. the Report complies with the requirements of Section 13(a) or 15(d) of
the Securities and Exchange Act of 1934, as applicable; and

   2. the information contained in the Report fairly presents, in all material
respects, the financial condition and results of operations of the Registrant.

By:                                    By:
President & Chief Executive Officer    Treasurer
IXIS Advisor Cash Management Trust     IXIS Advisor Cash Management Trust
- -------------------------------------  -------------------------------------

/s/ John T. Hailer                     /s/ Michael C. Kardok
- -------------------------------------  -------------------------------------
John T. Hailer                         Michael C. Kardok

Date: February 27, 2006                Date: February 27, 2006

A signed original of this written statement required by Section 906, or other
document authenticating, acknowledging, or otherwise adopting the signature
that appears in typed form within the electronic version of this written
statement required by Section 906, has been provided to the IXIS Advisor Cash
Management Trust, and will be retained by the IXIS Advisor Cash Management
Trust and furnished to the Securities and Exchange Commission (the
"Commission") or its staff upon request.