In TurboTax Online, you can do just that with the Clear & Start Over feature as long as you haven't paid or registered yet.

1. Sign in to TurboTax Online and open your return by clicking the orange Take me to my return button.
2. From the My Account dropdown menu, select Clear & Start Over.
3. Answer Yes to Are you sure you want to clear your return?
4. After your entries have been cleared out, we'll prompt you to select a TurboTax product so you can start over from the very beginning.
5. If you're signed in under last year's login, 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.

If you can't Clear & Start Over after you've registered, and it's convenient, consider opening a new account under a new username. Up to 5 accounts can be tied to the same email address.

Here’s how:

1. Sign out of TurboTax Online.
2. Select the TurboTax Online product you want to use for the second return and proceed.
3. On the Create your account screen, set up a new login for the second return.

• You can reuse your email address if you want to receive e-file notifications for the second return.
• Up to 5 accounts can be tied to the same email address.

Otherwise, try to post another question about your problem and someone should be able to help you fix it.