You can claim the full credit on your 2021 tax return when you file it if you did not receive any or all of the advance payments you were entitled to. You can also correct the amount you were due when you provide updated information on that return. You’ll receive more of a credit if you were underpaid, or you may have to repay the IRS, if you were overpaid. Ask the IRS for a payment trace if your advance payments were issued but you didn’t receive the money, for reasons such as being forwarded to the wrong bank account or mailed to an incorrect address. You can do this by submitting Form 3911, the Taxpayer Statement Regarding Refund, to the IRS.