Your ISOs are in the money. Now about that AMT warning.

Incentive stock options carry a genuine prize: exercise, hold the shares long enough, and the gain from your strike price to the eventual sale is taxed as long-term capital gain rather than ordinary income. The toll on that road is the alternative minimum tax. When you exercise an ISO and hold the shares, the spread between strike and fair market value that day is income for AMT purposes, even though no cash arrived. Everything about the decision turns on one variable: the size of the spread at the moment you exercise.

Why does everyone tell a horror story about this?

Because the failure mode is real and has a history. An executive exercises when the spread is large, owes AMT on paper income, and then watches the stock fall below the price that generated the tax. The dot-com era produced people who owed more in tax than their shares were ever worth again. The lesson is not that ISOs are dangerous. It is that exercising a large spread with no liquidity and no plan is dangerous, and the same exercise done earlier, smaller, or with a sale plan attached is a different decision entirely.

So when does exercising make sense?

When the spread is small, the toll is small. That is the logic of exercising early in a company's life, or exercising in measured annual tranches sized so the AMT consequence in any single year stays digestible. It is also the logic of the qualifying-disposition clock: shares must be held more than two years from grant and one year from exercise for the gain to qualify, so each year you wait to start is a year the capital-gains treatment moves further out. And AMT paid on an exercise is not entirely gone; much of it generates a credit that can return in later years, which makes the AMT closer to a prepayment than a pure cost, provided you can carry it.

When should I just take the ordinary income?

Sometimes the prize is not worth the road. Selling shares in a disqualifying disposition converts the spread to ordinary income, which sounds like failure but is often the right call: when the position is dangerously concentrated, when the company is private and the shares cannot be sold to cover the tax, or when the spread has grown so large that holding for capital-gains treatment means betting a life-changing sum on one stock for another year. Paying ordinary income tax on a certain gain beats capital-gains treatment on a gain that evaporates.

The honest limit

ISO planning is a multi-year modeling exercise, not a rule of thumb. The AMT calculation interacts with your other income, your state, the credit recovery, and the concentration question that sits underneath all of it. Any advice that fits in a sentence is wrong for someone.

The principle to carry

Exercise decisions are spread decisions. Small spread, small toll, easy call. Large spread, real toll, and the question stops being about taxes and starts being about how much of your net worth belongs on one company's chart.

Aspirean models ISO exercises inside the client's full tax picture, usually across several years, before a single share is exercised. If your option grant has quietly become a real number, that is the moment to talk.

This piece is general education, not individual advice. Whether any of it applies to you depends on your specifics, which is exactly the conversation to have before acting.