Why do you think you need it? You only need 2020 AGI in order to e-file a 2021 tax return. And e-filing is now permanently closed for 2021, so entering your 2020 AGI will not help you. The only way to file a 2021 tax return now is by mail. You have to print it, sign and date it in ink, and mail it in.
When you mail a tax return, you need to attach any documents showing tax withheld, such as your W-2’s or any 1099’s. Use a mailing service that will track it, such as UPS or certified mail so you will know the IRS/state received the return.
Federal and state returns must be in separate envelopes and they are mailed to different addresses. Read the mailing instructions that print with your tax return carefully so you mail them to the right addresses.
If you need your 2020 AGI for some other reason, then you need to look at line 11 of your 2020 Form 1040, or get your AGI from a transcript.
https://ttlc.intuit.com/community/prior-year-return/help/how-do-i-access-my-prior-year-return/00/270...
You can get a free transcript of your past return from the IRS:
https://www.irs.gov/individuals/get-transcript
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
