Again, I hope I didn't provide wrong info. I believe what I wrote is correct, as is understood. Also, individuals in this case nearly always go to tax professionals for guidance, and most aren't willing to sign off on theadvice to exclude it from the AMT.....
I believe the AMT is not owed on an exercised ISO.
When I showed section 83g to my accountants, their jaws bounced off the floor. All CPA's are licensed by the IRS. The IRS literally holds their careers in the IRS's hands. Only the most agressive will buck the IRS.
The CPA community tends to circle the wagons around their own as well, and they follow the opinion of whomever is the 'leading CPA'. Well if that leader hasn't done their homework, or won't publicly take an adverse stance, that sets the thinking in all the follower CPA's as well.
Then you also get the problem, if you ultimately convince them, that they've been mis-trained by the IRS and mislead by their peers, they're in a the awkward position of filing an ISO exercise a new way, inviting the scrutiny of the IRS and risking their license, and further risking being sued for malpractice by previous clients who paid the AMT on ISO's.
So they don't change, and don't rock the boat.
Show section 83g to your accountant and they'll either confess ignorance ('well gee that's tax law stuff and I rely on my trusty IRS example sheet'), or rely on the reputations of others ('you must be wrong because so and so wouldn't make a mistake and knows more about it than you'), or they'll scratch their heads.