In 2021, it was my first year using TurboTax. I purchased every protection/assistant to do this. I received a form saying there was a miscalculation on my state taxes and now I owe 3100 due to this mistake.
TurboTax guarantees accurate calculations, so if they make an error, they will pay you the penalty and interest but limitations apply. For more information, review the Intuit Terms Of Service For TurboTax Online Tax Preparation Services.
Refer to the TurboTax article How do I submit a claim under the TurboTax 100% Accurate Calculation Guarantee or 100% Accurate, Expert Approved Guarantee? for information.