EXHIBIT 15.1

        AWARENESS LETTER OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Board of Directors
TD AMERITRADE Holding Corporation

We are aware of the incorporation by reference in the Registration Statements
(Numbers 333-132016, 333-105336, 333-99481, 333-99353, 333-86164 and 333-77573
on Form S-8, Number 333-87999 on Form S-3 and Post Effective Amendment No. 1 to
Registration Statement Number 333-88632 on Form S-3 to Form S-4) of TD
AMERITRADE Holding Corporation of our report dated August 7, 2008 relating to
the unaudited condensed consolidated interim financial statements of TD
AMERITRADE Holding Corporation that are included in its Form 10-Q for the
quarter ended June 30, 2008.

                                             /s/ ERNST & YOUNG LLP

Chicago, Illinois
August 7, 2008