TurboTax does have a 100% Accuracy Guarantee. So if there was a software error, you would be reimbursed for penalties and interest. However, I did just read the guarantee and it says that the claim must be filed within 60 days of receiving the notice from the IRS. I'd probably still take a shot at it, though.
Here are links to info about the Guarantee, as well as another about submitting a claim.
What is the TurboTax 100% Accurate Calculation Guarantee?
How do I submit a claiim under the TurboTax 100% Accurate Calculation Guarantee?
*** I am NOT a tax expert. I am a seasoned TurboTax user, and volunteer to provide assistance to TT users. Nothing I post is to be considered TAX ADVICE; I bear no legal liability for responses.***
