You always owe your correct tax. If you took a full distribution of a traditional IRA, you owe tax on the entire amount. Pay the tax. (If you like, you can prepare an amended return for that year to make sure the tax calculation is correct.)
If the mistake was a program error and your data entry error, the turbotax accuracy guarantee is supposed to cover interest and penalties, but not your tax, because you always owe your own correct tax. You must file a claim for the accuracy guarantee within 60 days of getting a bill for the penalties and interest. https://ttlc.intuit.com/turbotax-support/en-us/help-article/intuit-account-billing/submit-claim-turb...
