After you file

I didn't say that right.  Try using zero 0 for the 2018 AGI to efile 2019.  If that doesn't work you will have to print and mail 2019.

 

When you mail a tax return, you need to attach any documents showing tax withheld, such as your W-2’s or any 1099’s. Use a mailing service that will track it, such as UPS or certified mail so you will know the IRS received the return. Don’t forget state.

 

Important! Mail Federal and State in separate envelopes and mail each year in separate envelopes.

 

Where to mail federal paper returns

https://www.irs.gov/uac/where-to-file-paper-tax-returns-with-or-without-a-payment

 

By the way, They are not processing mailed returns right now.