How to clear and start over.
https://ttlc.intuit.com/questions/2586254
NOTE:
If you DO NOT want to re-transfer last year's data after clearing your return, pay special attention to the 'pop-up' window "Are you sure you want to clear your return?"
There is a subtle option just above the blue "Yes" & "No" buttons.
MAKE SURE the box is UNCHECKED. (The default is 'checked' to re-transfer your data)
If the 'pop-up' window does not appear then try this work-around:
* Go to My Account
* Tools
* Transfer last year's TurboTax return from your computer (Note it does say "from your computer")
* Continue
* Continue without Transferring
If you have already paid for your return, OR registered, TTax Will NOT let you clear and start over.