Haven't received your third stimulus check yet? We understand if you're starting to feel anxious about where your $1,400 payment is and when your check could be scheduled to arrive. There could be a holdup with delivery if you think the IRS has your direct deposit information on file. If not, your third payment could arrive in the mail as a paper check or as an EIP card. But how will you get your payment if you receive Social Security benefits like SSI and SSDI?