Client Portals. For deposit, make checks payable to "TD Ameritrade FBO Your Name" and include your account number and mail: US Mail: TD Ameritrade Institutional - PO Box 650567, Dallas, TX 75265-0567. Overnight Mail: TD Ameritrade Institutional - 7801 Mesquite Bend Drive, Suite 112, Irving, TX 75063-6043. Optional ACH, DTC, ACAT, and ....