You have to wait for the original tax return to be fully processed before you amend. Then you can send an amended return to use the recovery rebate credit to get the 1st and/or 2nd stimulus payment if you did not receive it. There is no place to enter anything about the 3rd stimulus----that is issued separately by the IRS.
Select your tax year for amending instructions:
What does it mean to "amend" a return?
· Do I Need to Amend my 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.
https://ttlc.intuit.com/questions/1901539-how-do-i-preview-my-turbotax-online-return-before-filing
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.
Note: Do not expect quick results when you amend.
Even during “normal” times it takes about four months for the IRS to process an amended return. During the pandemic and due to the severe backlog at the IRS it is taking much longer—six months or more for many amended returns. Do not expect quick results from amending. When the IRS issues a refund for an amended return it will be by check. They do not make direct deposits for refunds for amended returns. You can watch for information here:
https://www.irs.gov/Filing/Individuals/Amended-Returns-(Form-1040-X)/Wheres-My-Amended-Return-1
@anthonyyoshida72 , if you return has been already filed and accepted -- then please wait till the processing is over ( your refund issued or say four to six weeks have gone past ) then file an amended return covering ONLY the EIP ( Economic Impact Payment ) section .
If your return is rejected then you can make the changes for the EIP -- recovery cerdit -- in addition to correcting for the rejection.
Here is some details from the IRS: https://www.irs.gov/newsroom/2020-recovery-rebate-credit-topic-g-correcting-issues-after-the-2020-tax-return-is-filed