As long as you have not actually filed (haven't mailed or successfully efiled), here's how to open the return back up to change filing methods if TurboTax thinks you are finished:
- Log in and go to "Your Tax Returns & Documents." Click that line or the word SHOW to expand.
- Under 2018 choose "Add a State." (you don't really add one; that's just to get the return to open up.)
- Once the return is open, go through the REVIEW tab to be sure all is still in order.
- Then go through the FILE tab and change the filing method to "efile."
- Then be sure you go all the way to the end to the final screen and click a button "Transmit My Returns Now".
NOTE: Do NOT use this method to open a return to make changes/edits to an
already-filed return (one that has actually been mailed or efiled.) If you later need to make changes to an already-filed return, you have to
go through the formal amending process, and your return must start off
exactly as originally filed.