What number should I use for the AGI if we filed late (November 2018) The number from the IRS transcript?

[xmasbaby0]

Note: If you filed late or amended your return, your correct 2018 AGI may not be in the system.

https://ttlc.intuit.com/questions/1944348-how-do-i-print-and-mail-my-return-in-turbotax-online

Note:  If you mail your federal return, you will also need to mail your state return.  You will not be able to e-file your state return.

https://ttlc.intuit.com/questions/3415597-what-if-i-entered-the-correct-agi-and-i-m-still-getting-an...

https://ttlc.intuit.com/questions/1944348-how-do-i-print-and-mail-my-return-in-turbotax-online

it is a good idea to use a mailing service that will track it like UPS or certified mail.  Then you will know the IRS received it.

[bluedeb]

Use your original adjusted gross income (AGI) from last year, if your return gets rejected, enter a zero for your 2018 AGI.