For 2018 I filed Married Joint, but this year I am single. I did not work last year. What is my AGI from 2018?

[Critter]

LOOK at the form 1040 of the 2018 return ... your AGI is the amount on line 7....

[xmasbaby0]

Your 2018 AGI is on line 7 of your 2018 joint return.

https://ttlc.intuit.com/community/agi/help/how-do-i-find-last-year-s-agi/01/25947

Your 2018 tax return shows your 2018 Adjusted Gross Income (AGI) If you filed a joint return then the AGI is the same for each of you.

Form 1040        line 7

If you are using the same TT account that you used last year, you should also be able to find this number in your Tax Home for 2018

If entering the amount from your 2018 tax return does not work, then try entering “0” instead.  If that does not work and you still cannot e-file, then print, sign, and mail your tax return.

You can get a free transcript of your past return from the IRS: 

https://www.irs.gov/individuals/get-transcript