This help article addresses how to get the AGI:
The best place to get last year's AGI is from the 1040 form you filed for 2018. Look on page 2, line 7. If you filed a 1040NR, it'll be on line 35.
If you're having trouble locating your 2018 return, the second-best place to get your AGI is from the IRS. You can order a free transcript of your return at the IRS Get Transcript site or you can purchase a full copy of your 2018 return. Both versions will include your AGI.
If you didn't file a 2018 federal tax return (or you haven't filed one yet), enter 0 as your AGI.
Alternatively, you can file your return on paper via mail.
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