Accuracy Guarantee https://ttlc.intuit.com/community/charges-and-fees/help/how-do-i-submit-a-claim-under-the-turbotax-1...
But it only covers actual CALCULATION errors in the program, not user error (and it’s almost always user error), and it only pays any penalties or interest resulting from that error, not the taxes. Either way, you are still responsible for the increase in tax.
