Eligible individuals who did not receive the full amounts of both Economic Impact Payments may claim the Recovery Rebate Credit on their 2020 Form 1040 or 1040-SR. To determine whether you are an eligible individual or the amount of your Recovery Rebate Credit, complete the Recovery Rebate Credit Worksheet in the Instructions for Form 1040 and Form 1040-SR.
Here is where to start to claim the Recovery Rebate Credit.
Log into Turbotax
Click Federal Review ( you should see "Let's make sure you got the right stimulus amount")
Click Continue
Click "Yes" and fill in the correct information
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