Im trying to file my 2019 taxes and it's asking to enter my 2018 Oregon tax liability from form OR-40. How do I find that form?

Always print a copy of your completed tax return for your records, and review it carefully before e-Filing.
You will need it if you are audited by the IRS, or to amend because a TurboTax update changes your return.
OR, to look up your last year's tax liability.

I did have a copy of last years and looked alllll over for the line they were asking info from and couldn’t find it. I’ll have to look again! 

@missxsara

Which line are you looking for? Your 2018 Oregon tax liability or your 2018 tax credit for taxes paid to another state?