The rest of this series covers incentive stock options, but ISOs are actually the special case. Non-qualified stock options (NSOs) are the default: they’re what contractors, advisors, and board members receive (ISOs can only go to employees), and they’re what employees receive whenever a grant doesn’t fit inside the ISO rules. Plenty of option holders have both types sitting in the same account, sometimes from the same grant.
The tax treatment is a different world: simpler rules, no AMT puzzle, and a much more immediate cash problem. Same running numbers as the rest of the series: 10,000 NSOs, $10 strike, shares currently valued at $110.
Why you might hold NSOs without ever asking for them
- The employee requirement: ISO treatment is only available to employees of the granting company (or its parent or subsidiary). Anyone providing services in another capacity (contractor, advisor, outside director) gets NSOs by default, whatever the grant paperwork is called.
- The $100,000 limitation: Even for employees, there’s a cap. Only $100,000 of options (measured by grant-date value of the underlying shares) can become exercisable as ISOs in any single calendar year; anything past the cap is automatically treated as NSOs. Large grants, short vesting schedules, and acceleration provisions all push against this limit, which is why big grants often arrive as an ISO/NSO split. Early-exercise provisions are the classic trap: if an entire grant is exercisable immediately, the whole grant counts against the cap at once, and everything over $100,000 of grant-date value converts to NSO on the spot.
- Deliberate choice: Some companies simply grant NSOs. Foreign companies, for example, may not want to incur the cost of administering a US-compliant equity plan. Nothing about an NSO grant implies something went wrong.
The practical point: an option holder should confirm what they actually hold, grant by grant, because the planning below differs sharply from the ISO playbook.
The core rule: income at exercise
NSOs skip the deferral that makes ISOs complicated. The spread at exercise is ordinary income, immediately, in full.
- The math: Exercise all 10,000 options and the $100-per-share spread is $1,000,000 of income that year. Not AMT income, not a preference item, just income at ordinary rates. And because tax brackets are progressive, a single-shot exercise of this size doesn’t get taxed at the rate a normal year’s income would: the spread stacks on top of everything else and catapults most of itself into the top bracket. Someone whose salary usually tops out in the 24% bracket can watch the bulk of a $1,000,000 spread get taxed at 35% and 37%, purely because it all landed in one year.
- For employees: The spread lands on the W-2 and runs through payroll, with income tax withholding and full Social Security and Medicare tax. One catch: withholding on supplemental income typically happens at flat statutory rates (22% on the first $1,000,000, and 37% on every dollar after that) that can sit well below the actual marginal rate on a spread this size, so a large exercise can be under-withheld even though it was withheld on. The remainder is due with the return, or through estimated payments.
- For contractors: No withholding backstop at all. The spread arrives on a 1099, the full tax bill lands on the contractor’s own estimated payments, and the spread is generally self-employment income on top, adding Medicare tax (2.9%, plus the 0.9% additional Medicare tax at higher incomes) and potentially the Social Security portion. This is a layer employees never see directly, and it can be easy to miss in back-of-envelope exercise math.
- After exercise: Basis equals the share value at exercise, and all further growth is capital gain, long-term once the shares have been held a year. The ordinary income hit is a one-time toll at the exercise gate.
The real cost of exercising
Add it up and a full exercise of this position requires, in the same rough window:
- The strike price: $100,000 in cash to the company.
- Federal income tax on the spread: At top marginal rates, in the neighborhood of $370,000 on $1,000,000 of spread, before deductions.
- Payroll or self-employment tax: Medicare tax at minimum, and for contractors potentially the full self-employment calculation, depending on the year’s other earnings.
- State tax: Varies from zero to six figures depending on the state.
The all-in number can approach half the paper value of the position, paid in cash, for shares that remain illiquid. The tax rules are easy to state; the funding problem is the hard part. (A calculator for running these numbers with your own inputs is coming soon.)
What the planning levers look like
- Timing toward low-income years: Since the spread stacks on top of the year’s other income, an exercise in a light year is taxed at lower marginal rates than the same exercise in a heavy one. This is the direct answer to the bracket problem above: the same $1,000,000 of spread realized as $250,000 a year over four years keeps far more of itself out of the top brackets than one $1,000,000 exercise does. Spreading exercises across several years does the same work the AMT-breakeven approach does for ISOs, just against ordinary brackets instead of the AMT.
- The ISO pairing play: For anyone holding both types (common, given the $100,000 split above), NSO and ISO exercises interact in a useful way. An NSO exercise raises regular taxable income, and as Part 2 covered, higher regular tax means a higher AMT breakeven. So a year with a planned NSO exercise is also a year with expanded capacity for AMT-free ISO exercises. Sequenced together, one exercise creates room for the other: the NSO spread absorbs the ordinary brackets while the ISO exercise rides the enlarged gap between regular tax and tentative minimum tax. Modeling both in the same projection can move meaningfully more of a mixed position into shares than planning each type in isolation.
- Exercising early while the spread is small: The income hit is the spread at exercise. Options exercised when the 409A was $12 generate $2 per share of income; the same options exercised at $110 generate $100. All growth after exercise is capital gain. For someone genuinely bullish, this is the argument for exercising as early as conviction and cash allow: it converts future appreciation from ordinary income into capital gain and starts the holding clock. The cost is taking investment risk sooner, which is the Part 1 question again.
- Pairing exercises with liquidity: Exercising into a tender offer or sale window means the proceeds can fund the strike and the taxes, and nothing has to come out of savings. The tradeoff is that exercising and selling at the same price leaves the entire gain as ordinary income; there was never a holding period to convert anything. Exercising outside a liquidity window preserves the conversion opportunity but means self-funding every layer of the cost above.
- QSBS still applies: Shares acquired by exercising NSOs can qualify for the Section 1202 exclusion just like ISO shares, with the holding clock starting at exercise. For anyone bullish enough to exercise early and hold, the payoff structure from Part 3 carries over intact.
What careful planning looks like here
For NSOs, planning is mostly a funding and timing exercise: projecting the year’s income, computing the true all-in cost of an exercise (strike, federal, payroll or self-employment, state), sizing the exercise to the bracket space and cash available, and making estimated payments on schedule so penalties don’t compound the bill. For a mixed ISO/NSO position, one projection covering both types at once can find combinations (like the pairing play above) that neither playbook finds alone. A tax advisor who models equity compensation regularly can put hard numbers on each of these pieces before any irreversible checks get written.
This article is for educational purposes only and is not tax, legal, or investment advice. The scenarios and numbers are illustrative and don't describe any actual client. Tax outcomes depend heavily on individual circumstances; consult a qualified tax professional about your specific situation.