At the very end of the TurboTax interview, you will enter what you received for the 1st and 2nd Stimulus payments. If you qualified but didn't receive one of them, it will be added to your 2020 Tax Refund.
You can also type "stimulus" in the search box (upper right-hand corner) to get to this section of the interview.
For the latest information regarding the 2nd Stimulus Check, you can check out this TurboTax Blog post: Why Haven’t I Received My Second Stimulus Check?
You can check the status of your stimulus payment with the IRS here: What is the Status of my Stimulus Payment?
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