TurboTax has a 100% Accurate Calculation Guarantee where if there was a calculation error on the tax return they will pay any penalties and interest caused by the error, but not any taxes owed. TurboTax will not pay for a user error or any user omissions of income.
See this TurboTax support FAQ to submit a claim - https://ttlc.intuit.com/turbotax-support/en-us/help-article/intuit-account-billing/submit-claim-turb...
