What exactly is your problem with your tax return? It is being rejected by the IRS for an incorrect 2019 AGI?
What benefits statement and/or monthly "deposit" are you referring to and what does it have to do with your tax return?
Monthly deposit? Benefit statement? Are you getting social security or a pension? You need the AGI (Adjusted Gross Income) from your 2019 TAX RETURN 1040. Not from your income deposits or statements.
You need your 2019 AGI to efile 2020. The AGI is on 2019 1040 line 8b. If you filed a Joint return you use the same AGI for each spouse.
How to find the AGI.
If you didn't file 2019 or filed it later in the year or mailed it, then try entering 0 for the AGI. If that doesn't work you will have to print and mail your return.
Or request a transcript from the IRS