TurboTax accounts cannot be deleted. You can clear any tax data you entered on the 2017 tax return by clicking on Tax Tools and then Clear & Start Over with the 2017 return accessed.
You can remove or change information in your TurboTax account by clicking Intuit Account at the top of the online program screen after signing onto the account. Click on Account Settings. Edit any information in both Profile and Security.
To deactivate an account you will need to contact TurboTax support for the procedure.
Use this website to contact TurboTax support during business hours - https://support.turbotax.intuit.com/contact/
Support can also be reached by messaging them on these pages https://www.facebook.com/turbotax/ and https://twitter.com/TeamTurboTax
