As long as you haven't paid or registered yet, you can use the Clear & Start Over account feature to remove your TurboTax data.
Here's how:
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Sign in to TurboTax Online (can't? Go here)
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Continue your/take me to my return.
- Go to My Account (upper right) and select Clear & Start Over.
- When asked 'are you sure you want to clear your return?' answer yes
