If you haven't paid or registered, you can use "Clear and start over" to erase a return. After clearing, just don't start over. To deactivate the account, however, you'd need to phone TurboTax Support.
FAQ: How do I clear and start over in TurboTax Online?
Here's how to contact TurboTax Support to begin an account deactivation process.
FAQ: What is the TurboTax phone number?
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