If you already receive Social Security benefits, you can start or update your direct deposit by visiting your online my Social Security account. Simply log in, navigate to your profile page, and input your direct deposit information. You can set this change to take effect immediately or at a specified later date. If you receive SSI benefits, don't have a U.S. mailing address, or otherwise aren't able to make this change online, you can contact your bank or call the Social Security Administration at  1-800-772-1213.