How do I correct a mistake before I file?

[TomK · Accepted solution]

Please follow the instructions below to make changes or add to your still as unfiled return:

1. In TurboTax Online, sign into your account.
2. Select Tax Home in the left menu.
3. Scroll down to Your tax returns & documents.
4. Select 2018, and then select Add a State (you're not actually adding a state, this just opens the return back up)
5. Make changes and then refile (do NOT refile if you have already submitted your return… unless it was rejected to make a correction(s)) .