It seems to be a glitch in the TT software. I called the number as suggested but had to pay to upgrade to talk to someone. I am not happy that "call us" is the best reply they could come up with. It also took some days to get a reply; I see a noticeable decline in forum support this year.
We opened up my in-process tax form (I don't recall which schedule) and the support person found that my AMT was credited there. I don't remember how we undid it, but the button next to that AMT credit now says Start and I'm afraid to touch it. I hope she's right that the credit is being taken. She said she would alert TurboTax of the problem.
Maybe you can ask TT to waive the upgrade since this is their fault. They should at least acknowledge the problem in the forum and post how to get around it.
