The Adjusted Gross Income for the first person listed on the return. Form 1040 line 11, before deductions to find the taxable income.
See How do I find last year’s AGI? for the lookback or filing.
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Do you need the 2019 AGI to efile 2020? If you filed a Joint return last year there is only 1 AGI. Enter the same AGI for each spouse.
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 then try entering 0 for the AGI. If that doesn't work you will have to print and mail your return.