NQSOs: ordinary income at exercise, no exceptions

What makes an option "non-qualified"

The IRS classifies stock options as either incentive stock options (ISOs) or non-qualified stock options (NQSOs, also written NSOs). ISOs must satisfy a strict set of requirements under IRC § 422 — including employee-only issuance, a $100,000 annual ISO limit, and exercise within 10 years of grant. Everything else is an NQSO by default.

At late-stage private companies, NQSOs are extremely common:

• Grants to contractors, advisors, and board members must be NQSOs (ISOs are employees-only).
• Grants above the $100K annual ISO limit automatically convert to NQSOs for the excess.
• Many companies simply grant NQSOs to all employees — fewer restrictions on the company's side.
• RSUs have become more common for rank-and-file employees, but executives and early employees often still hold option grants, a significant share of which are NQSOs.

If your grant agreement says "non-qualified stock option," "NSO," or "NQSO" — or if it omits the word "incentive" — you have NQSOs.

The tax event: exercise creates ordinary income

Under IRC § 83 and IRS Topic 427, the moment you exercise an NQSO you recognize ordinary income equal to:

(FMV on exercise date − Strike price) × Shares exercised

This amount is called the spread. It goes on your W-2 (box 12, code V) if you are an employee — meaning your employer withholds taxes. Contractors receiving NQSOs get a 1099-NEC instead and must handle their own estimated payments.

The spread is included in W-2 box 1. Withholding is mandatory at the IRS supplemental rate (22% for proceeds up to $1 million; 37% above). If your real marginal bracket is above 22%, you will owe more at filing. Plan accordingly — see our RSU withholding calculator for sizing the gap.

FICA: the layer on top of income tax

Because the NQSO spread is treated as wages, it is also subject to FICA:

In practice: if you earn a $250K salary and exercise NQSOs with a $300K spread, your total wages jump to $550K. Social Security is capped early in the year, but you'll pay full Medicare (1.45%) plus 0.9% additional Medicare on $350K above the $200K threshold — an extra ~$5,900 on top of income tax.

Your shares after exercise: the capital gains clock

Once you exercise, you own shares. Their tax basis equals FMV on the exercise date — the full amount you already paid income tax on. Appreciation after that date has its own tax treatment:

• Held more than one year from exercise date → long-term capital gains (0%, 15%, or 20% federal depending on income, plus 3.8% NIIT if applicable).
• Held one year or less → short-term capital gains, taxed as ordinary income at your full rate.

At a pre-IPO company, you often can't sell immediately after exercising — there's no market. But the LTCG clock starts at exercise, so exercising early (while FMV is lower) and holding for a year can convert future appreciation to capital gains. This is the same logic that drives 83(b) elections for restricted stock — see the early exercise and 83(b) guide for the mechanics. For ISOs, the AMT exposure is the main cost of that strategy; for NQSOs, it's the upfront income tax on the spread at exercise.

QSBS note: shares acquired by exercising NQSOs in a qualifying C-corp can qualify for the Section 1202 exclusion, provided the company met the gross-asset test at issuance and you hold the shares for the required period. The QSBS clock starts at the exercise date. See the QSBS guide for the post-OBBBA eligibility rules.

ISO vs. NQSO: the core tradeoffs

ISOs can produce a lower total tax on a qualifying disposition — ordinary income is only realized at exercise if you hold through AMT. But the AMT on a large ISO exercise at a still-private company is a real cash risk (you owe AMT now, can't sell to fund it). Use the ISO / AMT calculator to model that scenario. NQSOs are simpler: you know the bill at exercise.

Worked example: 3,000 NQSOs at a late-stage company

Planning decisions: how to approach an NQSO exercise

1. Know where the spread lands in your bracket. Calculate total income before the exercise (salary, other W-2, investment income) and add the spread. The marginal bracket the spread falls into is your minimum federal rate. In the example above, a $300K salary puts the entire $336K spread in the 35% federal bracket, well below the 37% threshold. A $400K salary would push it there.
2. Model the FICA before you exercise. If your salary is below $184,500, the NQSO spread is also subject to SS (6.2%) — an additional $11,439 on $184,500. Know whether you've crossed the cap before exercising.
3. Fund your estimated taxes immediately. Withholding on supplemental income is 22% — but your marginal rate may be 35% or 37%. The gap on $336K at 35% vs. 22% = $43,680 you'll owe in April unless you make Q3 or Q4 estimated payments. Quarterly deadlines: Q1 Apr 15, Q2 Jun 16, Q3 Sep 15, Q4 Jan 15.
4. Decide whether to hold shares post-exercise. If you expect the company to grow significantly before an IPO and want LTCG treatment on future appreciation, exercising and holding for 12+ months converts that gain. The cost: income tax + FICA at exercise, paid with cash you cannot recover if the stock declines. Only take this risk with shares you're prepared to hold through failure.
5. Consider year-timing if you have flexibility. If your grant has a broad exercise window (many private-company NQSOs allow exercise any time after vesting), splitting exercises across two calendar years can avoid pushing all the income into a single year's bracket. Verify your post-termination window if you are leaving the company — unlike ISOs, NQSOs can contractually be extended beyond 90 days, but check your agreement.
6. Check QSBS eligibility before exercising. If the company meets the § 1202 gross-asset test, exercising now starts the QSBS clock. The 5-year (or 3/4-year under OBBBA for post-July 2025 stock) holding period begins at exercise. The income tax on exercise does not disappear — but QSBS exclusion could shelter future appreciation gains entirely.

NQSOs at a tender offer or secondary sale

Sometimes you can participate in a tender offer or secondary without first exercising: the company (or buyer) allows a net-exercise or cashless exercise directly into the sale. In that case, you exercise and sell in the same transaction. The spread from grant to sale price is all ordinary income — there is no holding period, no capital gains. The tender offer calculator models this for both shares already owned and options exercised into the tender. See the calculator and the full tender offer guide for the decision framework.

What you actually need to decide

The NQSO tax is not avoidable — but it is modelable. The key questions before you act:

• What is the actual FMV the company will use? (The 409A valuation for private companies — see the 409A guide for why it matters.)
• What is your effective combined tax rate (federal + state + FICA) on the spread at this income level?
• If you're holding post-exercise, what's the realistic upside scenario that makes that tax cost worth it? What's the downside (illiquid shares that decline in value while you've already paid tax)?
• Do you have cash to fund the tax, or do you need to sell shares to cover? (Exercise-and-sell triggers the income tax immediately and eliminates the LTCG optionality.)

These are consequential, irreversible decisions. The math is straightforward; the inputs are not. An equity-comp specialist can model your specific grant, current income, and company scenario before you act.

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