NQSO After-Tax Calculator
When you exercise nonqualified stock options (NQSOs), the spread — the difference between market price and your strike price — is ordinary W-2 income. You owe federal income tax at your marginal rate, Social Security (up to the wage base), Medicare, and state income tax. This calculator shows your real tax bill so there are no surprises at exercise.
How NQSO taxation works
Under IRC § 83 and IRS Publication 525, the spread at NQSO exercise is employment income — taxed at your marginal federal rate, subject to FICA, and taxed by your state as ordinary income. The employer is required to withhold, typically at the 22% federal supplemental rate (37% for supplemental wages above $1M in a calendar year). If your actual marginal rate is higher, you owe the difference at filing.
After exercise, your cost basis in the shares equals the FMV at exercise. Any further appreciation is capital gain — long-term if you hold 12+ months, short-term otherwise.
FICA on NQSO exercise
Social Security tax (6.2%) applies to the spread up to the 2026 wage base of $184,500.2 If your W-2 salary already exceeds $184,500 before exercise, no additional Social Security is owed on the spread. Medicare (1.45%) applies to all wages with no cap. If total income exceeds $200,000 (single) or $250,000 (MFJ), an additional 0.9% Additional Medicare Tax applies to the excess under IRC § 3103.
Timing levers
- Exercise in a low-income year. The spread is stacked on top of your other income — a lower W-2 base before exercise means a lower bracket for the spread.
- Spread exercises across calendar years. If your grant is large, exercising in December and again in January splits income across two tax years, potentially staying in a lower bracket both years.
- Hold for LTCG. Once you exercise, further appreciation from FMV-at-exercise to your sale price is long-term capital gain if you hold 12+ months. The spread between a 37% marginal rate and a 20% LTCG rate on a large lot is material — but you take concentration risk while waiting.
- There is no qualifying disposition for NQSOs. Unlike ISOs, the spread is always ordinary income at exercise regardless of holding period. The holding period only affects the post-exercise appreciation.
Related tools
- ISO Exercise AMT Calculator — if you have ISOs, model AMT exposure before exercising
- 83(b) Election Calculator — early-exercise decision tool for pre-IPO options
- Complete Stock Option Planning Guide — ISO vs. NQSO, 10b5-1, pre-IPO framework
- Match with a specialist advisor
Get your NQSO exercise modeled by a specialist
Your actual tax picture depends on state tax rates, W-2 timing, other stock positions, and whether holding concentrates your risk beyond what's prudent. A fee-only specialist can run your real numbers before you exercise.
Sources
- IRS Topic No. 427 — Stock Options: tax treatment of ISOs and NQSOs; ordinary income at NQSO exercise.
- SSA — Contribution and Benefit Base. 2026 Social Security wage base: $184,500.
- IRS Topic No. 751 — Social Security and Medicare Withholding Rates. Employee rates: 6.2% SS + 1.45% Medicare; Additional Medicare Tax 0.9% over threshold.
- Charles Schwab — NQSO Taxes Guide: ordinary income treatment, FICA withholding, cost basis, and post-exercise holding periods.
State rates are approximate marginal rates for high-income earners as of 2026. California rises to 13.3% above $1M; New Jersey to 10.9% above $1M; New York state to 10.9% above $25M (NYC residents pay additional city tax). Federal ordinary income brackets per IRS inflation adjustments for 2026. Values verified April 2026.