The same thing happened to me (just received the IRS notice today). Instead of getting a refund, I have to pay some tax. As far as the TurboTax "100% Guarantee", that only covers any penalty. We are still liable for any tax. Pretty much a useless guarantee - who is going to bother filing some paperwork to recoup 58 cents? There is definitely a coding error in TurboTax software for 2024.
