See the following FAQ regarding how to clear and start over:
https://ttlc.intuit.com/replies/4248526
If you just want to delete an individual form, please follow these instructions:
TurboTax Online
- While in
your return, click on Tax Tools > Tools (in the black bar
at the side of your screen). [See Screenshot #1 below.]
- Click on Tools.
- Under "Other helpful
links" click on Delete a form. [Screenshot #2]
- Click Delete next to the
appropriate form or schedule and follow the onscreen instructions. [Screenshot #3]
- Once you have finished deleting
the desired form(s) click the Continue with My Return box (in the
lower right of your screen).
TurboTax CD/Dowload
- Go into Forms Mode by
clicking on the Forms icon in the top right of the blue bar. [Screenshot
#4]
- In the Forms in My Return
list on the left, double-click on the form you wish to open and
delete. [In this case the 1040X.] [Screenshot #5]
- Click on the Delete Form
box at the bottom of the screen.
- To return to the interview, click
on the Step-By-Step icon in the top right of the blue bar.
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