Line 8b of your 2019 Form 1040 has your 2019 AGI.
Where do I find my AGI?
Your 2019 tax return shows your 2019 Adjusted Gross Income (AGI) If you filed a joint return then the AGI is the same for each of you.
Form 1040 line 8b
If you are using the same TT account that you used last year, you should also be able to find this number in your Tax Home for 2019
If entering the amount from your 2019 tax return does not work, then try entering “0” instead. If that does not work and you still cannot e-file, then print, sign, and mail your tax return.
You can get a free transcript of your past return from the IRS:
Note: If you filed late or amended your return, your correct 2019 AGI may not be in the system.
Note: If you mail your federal return, you will also need to mail your state return. You will not be able to e-file your state return.
it is a good idea to use a mailing service that will track it like UPS or certified mail. Then you will know the IRS received it.
If you used the wrong AGI, your e-file be rejected. When you get the rejection notice, correct it and re-file.
The 2019 AGI is on your 2019 federal tax return, Form 1040 Line 8b
To access your prior year online tax returns sign onto the TurboTax website with the User ID you used to create the account - https://myturbotax.intuit.com/
Scroll down to the bottom of the screen and on the section Your tax returns & documents click on Show. Click on the Year and Click on View adjusted gross income (AGI)
If you used the desktop CD/Download editions installed on your computer, the only copy of your tax data file and any PDF's will be on the computer where the return was created. TurboTax does not store online any returns completed using the desktop editions.
Or go to this IRS website for free federal tax return transcripts - https://www.irs.gov/individuals/get-transcript
For a fee of $43 you can get a complete federal tax return from the IRS by completing Form 4506 - http://www.irs.gov/pub/irs-pdf/f4506.pdf