An amended return, Form 1040-X, can only be printed and mailed to the IRS if the original tax return was not e-filed. The IRS will take up to 16 weeks or longer to process an amended tax return.
Before starting to amend the tax return, wait for the tax refund to be received or the taxes due to be paid and processed by the IRS.
See this TurboTax support FAQ on amending a tax return originally completed and filed using the 2020 TurboTax editions - https://ttlc.intuit.com/community/amending/help/how-do-i-amend-my-return/01/27439
When amending the 2020 tax return, enter stimulus in the Search box located in the upper right of the program screen. Click on Jump to stimulus
Answer the questions for the stimulus payments you did NOT receive.
Have you prepared 2020 tax return? The way to get the 1st or 2nd stimulus amount that you did not yet recei e is to use the recovery rebate credit on your 2020 tax return.
The stimulus check is an advance on a credit you can receive on your 2020 tax return. If something went wrong or you did not get the stimulus check in 2020, you can get it when you file your 2020 return in early 2021
The Recovery Rebate Credit will be found in the FEDERAL REVIEW section. ( you should see "Let's make sure you got the right stimulus amount”) If you are eligible it will end up on line 30 of your 2020 Form 1040.
Make sure that you enter ALL of the stimulus money received for the 1st and 2nd stimulus for yourself, your spouse and your children.
Click on Tax Tools on the left side of the screen. Click on Tools. Click on View Tax Summary. Click on Preview my 1040 on the left side of the screen.
If you already prepared and filed your 2020 return and did NOT use the credit---and did NOT have an amount on line 30 of your Form 1040------then when your 2020 return has been fully processed you can amend and use the recovery rebate credit---but do not expect quick results. It takes about six months for the IRS to process an amended return.
Select your tax year for amending instructions: