I do not have my 2017 tax number so Turbo tax can't e-file my 2018 return. I used turbo tax for my 2017 return but cannot access the number. How do I get this number

[xmasbaby0]

Your 2017 AGI does not matter any more.  You cannot e-file---- e-filing for 2018 has been closed permanently since October 15, 2019.  You do not need the AGI.   Your 2018 return has to be printed, signed and mailed now.

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/state received the return.

[DoninGA]

E-filing a 2018 tax return using TurboTax was permanently closed after October 20, 2019.

The 2018 tax return can only be printed and mailed.

If you are using the TurboTax desktop editions, in the File section of the program you will need to change the method of filing to File by Mail

To access your current or prior year online tax returns sign onto the TurboTax website with the userID you used to create the account - https://myturbotax.intuit.com/

Scroll down to the bottom of the screen and on the section Your tax returns & documents click on Show.  Click on the Year and Click on Download/print return (PDF)

Print, sign, date and mail the tax return to the IRS.  Include with the mailed return any forms W-2 and 1099 which have taxes withheld.  Go to this IRS website for mailing addresses - https://www.irs.gov/filing/where-to-file-paper-tax-returns-with-or-without-a-payment

There are no penalties for filing a tax return after the due date if filing for a tax refund or there are no taxes owed.