[psanford]

You can claim the AMT credit in the future tax years.

[buck4roo]

Correct me if I'm wrong, but I recall this AMT overpayment credit could only be used up at rate of $3k/year and only in years where you also owed AMT?

[psanford]

Here's the relevant code. It sounds like your understanding doesn't match the current rules (consult a tax professional): https://www.law.cornell.edu/uscode/text/26/53