Please include your account number on the memo section of your check as well as the back of the check.

*If you are making an IRA, Roth IRA, or retirement plan contribution, please also include the year of your contribution on the memo section as well as on the back of the check.  For example: "2012 Contribution Account #12345678"

You may either deposit checks at your local TD Ameritrade branch (click here for locations) or mail checks to:
TD Ameritrade Institutional
4075 Sorrento Boulevard, Suite A
San Diego, CA 92121