Hello @ethan-d-weller97!
It sounds like you need your 2018 AGI so that you can E-file your 2019 return.
The 2018 AGI is on the 2018 Federal tax return you filed Form 1040 Line 7
If you filed your 2018 taxes with TurboTax, sign in and go down to Your tax returns & documents. Select View adjusted gross income (AGI).
You can also view or download a transcript of your return at irs.gov
Keep in mind at this time tax transcripts are only available online as the IRS has stopped processing transcript requests by mail until further notice.
We have also have a great article on this subject: How do I find last year's AGI?
Also, this will help with entering your AGI in TurboTax: Where do I enter AGI?
Hope that helps!
Adrian E
