TurboTax accounts cannot be deleted. You can simply abandon the account. No one else has access.
Or are you referring to an Advantage membership that you want to cancel?
https://ttlc.intuit.com/community/downgrading/help/how-do-i-cancel-my-turbotax-advantage-subscriptio...
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
