That is all you need to do is follow the instructions for the amendment (Form 1040X). It is scheduled to be available tomorrow. This year, amendments can be e-filed, so the original and changes can be e-filed with TurboTax. When you prepare the amendment, you will go directly to the stimulus questions and enter the amounts you received for the 1st and 2nd payments. When you enter 0 for the second one, the recovery rebate will be calculated and added to Form 1040X. I will leave the instructions here, but as mentioned by you and above, it won't be ready until at least tomorrow.
You will need to amend if you already mailed your return (or the government accepted your e-file) and:
- You forgot to report income or claim dependents, deductions, or credits (such as the recovery rebate).
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