The IRS requires your 2018 AGI to verify your identity for e-filing. If you're paper-filing your return, you won't need your AGI because those are manually processed.
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. You won't find your AGI on your W-2 or 1099 form because those forms don't take into account over a dozen above-the-line deductions that go into calculating your AGI.
Where do I correct my 2018 AGI in TurboTax Online?
To revisit the 2018 AGI section in TurboTax Online:
- Sign in and open your return, if you haven't already done so.
- From the left menu, select File (tap in the upper-left corner to expand the menu on mobile devices).
- Select Start next to Step 3 (if needed, revisit Steps 1 and/or 2 to activate Step 3).
- Select I want to e-file.
- Continue until you see the place to enter your 2018 AGI.
https://ttlc.intuit.com/community/agi/help/where-do-i-correct-my-agi-in-turbotax-online/00/26311
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