If you are asking about the "Online" software..there is nothing to renew....you just don't use it next year.
IF you are talking about the download/desktop "Advantage" purchase that renews every year....you cancel it here:
https://ttlc.intuit.com/community/downgrading/help/how-do-i-cancel-my-turbotax-advantage-subscriptio...
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
