Software licenses usually explicitly disclaim all financial damages. I assume Intuit does too (I don't use Turbotax myself).

If an LLM hallucinates your income or deductions, the IRS is not going to go after the LLM, it's going to go after the taxpayer. I can't believe what I'm seeing in some of these replies. Making a mistake on your taxes is at best, a stressful letter from the IRS, and at worse, prison time. Place your trust appropriately.

Intuit actually will indemnify any penalties in case of filing errors on their part.