i NEVER GOT THE 3RD STIMULUS, HOW DO I CLAIM IT?

​You can claim the recovery rebate credit for the third payment on your 2021 return, You may need that information from letter 6475 to determine whether you are eligible to claim a 2021 Recovery Rebate Credit on your 2021 tax return filed next year. This information will help you if you don't receive a third payment or don't receive the maximum amount this year, because you may be eligible to claim the 2021 Recovery Rebate Credit when you file your 2021 tax return.