In TurboTax Online, you can erase your return and start from scratch as long as you haven't submitted payment, deducted the TurboTax fee from your refund, or registered. If you haven't already done so, sign in at TurboTax.com and make sure you've gone past the blue "Simple and accurate" screen. In the left-side menu, select Tax Tools, and then select Clear & Start Over (click or tap the 3 lines in the upper-left corner if you don't see this menu). (see attached tax tools) Answer Yes in the pop-up to confirm.