I was granted Employee Stock Options, 1/4 of which vested each year. From 2015 through 2017, I purchased those options at the strike price I was given when I was hired, so I was required to pay Alternative Minimum Tax (AMT) for those three years which was a considerable amount (this in addition to the amount paid for the options).

I file my taxes on my own, but I don't think I included the AMT amount on my tax returns which, I believe, would have been included as a deduction, thus lowering my tax liability for those three years.

I'm in a much tighter spot financially right now, so as I'm filing my taxes (extension approved by IRS) and including the information on my 1099-B for the sale of some of those options, I'm hoping I can retroactively include the AMT I paid from 2015-2017; otherwise I feel like I'm getting taxed twice since I'm required to pay capital gains tax, too.

Any advice would be greatly appreciated.