In TurboTax Online, you can clear and start over as long as you haven't paid or registered yet (free users are asked to register their accounts before they file).
A reason you might want to clear and start over is if you think you’re in a higher-priced version of TurboTax and don’t need to be. Have a look below under Related Information for more details.
Mobile app users can’t clear and start over. If you’re using the mobile app, log in to your TurboTax account from a browser instead.
If you're signed in under last year's login, once you clear and start over we'll automatically transfer last year's info over if you select the PLUS upgrade, Deluxe, Premier, or Self-Employed. Federal Free Edition (without PLUS) does not include the year-over-year transfer feature.