TurboTax accounts cannot be deleted. You can clear and start the return over if you have not registered, paid or e-filed. But if it is too late for that, then you can just abandon the account and start over in a new online account. Nothing will happen with the old one.
CLEAR AND START OVER
https://ttlc.intuit.com/questions/2586254-how-do-i-clear-and-start-over
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-start-another-return-in-turbotax-onli...
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