As long as you haven't paid your TurboTax Online
fee, or already filed the return, you can clear any data that you have
entered (Fees paid through Refund Processing and pre-paid code
also count as "paid.")
Once you've paid or registered, we're required to
store copies of your return. These are the same requirements imposed on
accountants, CPAs, and other professional tax preparers.
You can follow the instructions listed in this
TurboTax FAQ to clear your return:
https://ttlc.intuit.com/replies/3300662