Depending on how you filed in the previous year, the Prior Year AGI is found on the first page of form 1040 line 11. If you did not file with FileYourTaxes.com in the prior year, you can refer to the IRS to help assist you in finding your prior year AGI.
How to find your prior year AGI in FileYourTaxes.com
If you filed last year's return with FileYourTaxes.com, you can view your AGI in the My Forms tab in the top navigation bar of a 2020-2023 tax year return.
Select your Form 1040 in the drop down to locate your 2023 AGI on line 11.