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What is the difference between ISOs and NSOs?

Incentive stock options (ISOs) and non-qualified stock options (NSOs) differ mainly in tax treatment. Exercising an NSO creates ordinary income on the spread right away. Exercising an ISO creates no regular income tax, but the spread can trigger alternative minimum tax, and favorable treatment requires meeting specific holding periods.

How NSOs are taxed

When you exercise a non-qualified option, the spread between the strike price and the market value is ordinary income that year, reported on your W-2 with withholding. Your basis then becomes the full market value at exercise, so any later change is a capital gain or loss. NSOs are simpler to predict, and simpler is worth something.

How ISOs are taxed, and where AMT comes in

Exercising an incentive option triggers no regular income tax, which is the appeal. The spread is, however, an adjustment item for the alternative minimum tax, a parallel calculation that can pull a large exercise into a tax bill you did not expect. The larger the spread and the more shares you exercise in one year, the more likely AMT becomes relevant. This is the single most common way a good ISO outcome turns into a cash-flow problem.

Qualifying and disqualifying dispositions

If you hold ISO shares at least two years from the grant date and one year from exercise, the sale is a qualifying disposition and the entire gain over your strike price can be taxed at long-term capital gains rates. Sell earlier and it becomes a disqualifying disposition, which converts part of the gain back to ordinary income. The rules reward patience, though patience also means holding concentrated stock longer.

Why the timing of an exercise matters so much

Spreading exercises across multiple tax years, exercising earlier when the spread is small, and modeling AMT before you act are all ordinary planning moves that can change the outcome meaningfully. The decisions that matter most tend to happen before the exercise, not after. Once the transaction is done, most of the flexibility is gone.

How this works at Hunt Wealth

We model the after-tax result of an exercise before you make it, including an AMT projection, and lay out a multi-year exercise plan when spreading it out serves you better than doing it all at once.

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