For your 2017 AGI you don't use $ signs or decimals. You can try just entering zero (just one zero) for your 2017 AGI if your correct AGI is not working. If nothing works for your AGI, you would have to mail in your return.
You find your AGI
- On your originally-filed 2017 tax return, form 1040 (Line 37), 1040A (Line 21), 1040EZ (Line 4), 1040NR (Line 36), Form 1040X (Line 1, column A)
How do I find last year’s AGI?
https://ttlc.intuit.com/replies/3301618
