June 6, 2019 3:47 AM
The location is based on which 1040 form you used to file last year.
- Form 1040 - Line 37
- Form 1040A - Line 21
- Form 1040EZ - Line 4
- Form 1040NR - Line 36
- Form 1040X - Line 1, Column A
Here is a great FAQ that includes more information about finding AGI: