What this calculator answers
This tool models one ordinary 2026 employee exercise of a nonstatutory stock option that did not have a readily determinable value at grant. It assumes the acquired stock is substantially vested at exercise, the employer reports the positive exercise spread as Form W-2 Code V wages, and the Code V amount is a separately identified supplemental wage payment eligible for the optional flat federal withholding method.
It calculates shares multiplied by exercise price, shares multiplied by payroll FMV, the positive compensation spread, modeled federal income tax withholding, employee Social Security and Medicare withholding, cash needed if the exercise price and modeled federal withholding were both paid with cash, and initial basis before commissions or later adjustments. It does not calculate an actual cashless exercise, shares sold, sale proceeds, final income tax, capital gain or loss, state tax, or whether exercising is financially appropriate.
Confirm that the option is an NSO first
The IRS separates statutory options—generally qualifying incentive stock options and employee stock purchase plan options—from nonstatutory options. A company portal may call an award an NQSO, NSO, nonqualified option, or simply a stock option. The legal plan and grant agreement determine the route; the fact that the option has an exercise price does not make it an ISO.
IRS Topic 427 explains that most nonstatutory options do not have a readily determinable fair market value at grant. Under that common path, no taxable event occurs at grant, and income generally arises when the option is exercised. If the option had a readily determinable value at grant, different timing applies and this calculator stops.
Use the 2026 Stock Compensation Tax Guide when the award type is uncertain. It routes RSUs, ISOs, NSOs, ESPPs, and restricted stock through their different ownership, compensation, AMT, basis, and sale records before a calculator is selected.
The employee exercise spread becomes compensation
For the supported option-without-readily-determinable-value path, the modeled spread per share is payroll FMV minus exercise price, but not below zero. Multiply the positive spread by shares exercised. IRS Publication 525 describes the income as the difference between the amount paid and the FMV when the acquired property becomes substantially vested.
Suppose 1,000 shares are exercised at $10 when the employer’s supported payroll FMV is $25. Exercise cost is $10,000, exercise-date stock value is $25,000, and the positive spread is $15,000. Under the supported employee path, the $15,000 is compensation. It is not a capital gain merely because stock is involved, and the $25,000 stock value is not all wage income.
If payroll FMV is no greater than exercise price, the simplified positive spread is zero. That does not prove the exercise was correctly valued, commercially sensible, or free of reporting issues. The employee still paid exercise cost and acquired an asset whose supported initial basis can exceed its exercise-date value.
Form W-2 Code V creates a record trail
The 2026 General Instructions for Forms W-2 and W-3 direct employers to report the employee’s NSO exercise spread in box 12 using code V. The amount is also included in box 1, box 3 up to the Social Security wage base, and box 5 under the ordinary supported path.
Reconcile the exercise confirmation and payroll statement with the eventual Form W-2. Code V is not an additional amount to add on top of box 1 when preparing the return; it identifies compensation already included in the wage reporting. Treating Code V as separate extra income can count the same exercise twice.
A missing or different Code V amount should be investigated with the employer. This page cannot correct Form W-2, determine FMV, or decide whether restrictions postponed income. Save the grant, exercise, payroll, and year-end tax documents together.
Substantial vesting controls this shortcut
Publication 525 states that when stock received from exercising the ordinary option remains subject to a substantial risk of forfeiture, the income generally is not included until the stock becomes substantially vested. An early-exercise arrangement can therefore have a different measurement date and may involve a Section 83(b) election.
This calculator requires shares to be substantially vested at exercise and deliberately stops for restricted or forfeitable stock. Do not enter exercise-date FMV merely because the brokerage interface accepted an exercise. Confirm transferability, forfeiture terms, repurchase rights, service conditions, and any election with the plan and qualified guidance.
Federal withholding is not the final tax rate
The supported page applies the optional 22% federal supplemental-wage rate to the Code V wage portion through the cumulative $1 million boundary and 37% to the portion above that boundary. These are withholding rates, not a promise that the wage is finally taxed at either percentage. The complete return can place additional wages in a different marginal bracket.
2026 IRS Publication 15 permits the 22% method only for separately identified supplemental wages when federal income tax was withheld from regular wages in the current or immediately preceding calendar year. An employer may instead use an aggregate method based on regular wages, the payroll period, Form W-4, and prior withholding. This tool stops rather than pretending that 22% applies to every NSO exercise.
After the exercise, compare the full-year projected return with all expected withholding. The 2026 Federal Income Tax Bracket Calculator can show ordinary rate-schedule arithmetic only after projected taxable income is established. The 2026 Quarterly Estimated Tax Calculator can test its supported safe-harbor path only after projected total tax and payment amounts are ready.
The $1 million supplemental-wage boundary is cumulative
Prior bonuses, commissions, equity wages, and other supplemental wages from the employer and applicable businesses under common control can consume the first $1 million before the current exercise. Only the portion of a current supported payment above the cumulative boundary is modeled at 37%.
If prior 2026 supplemental wages are $990,000 and the current Code V spread is $50,000, the first $10,000 of the spread reaches the boundary and is modeled at 22%. The remaining $40,000 is modeled at 37%. Regular salary should not be entered merely because it is taxable compensation.
Social Security applies only through the 2026 wage base
The employee Social Security rate is 6.2% and the 2026 contribution and benefit base is $184,500. The calculator limits current Code V wages to the base remaining after the entered prior Social Security wages. The Social Security contribution and benefit base table confirms the 2026 amount.
Unrelated employers generally apply their own wage records when withholding. Reaching the annual base across multiple employers can create an employee excess handled under the applicable return rules, but one employer normally does not stop because another employer’s wages were entered here. Use the payroll record actually processing the exercise.
Medicare withholding follows a separate threshold
Regular employee Medicare withholding is 1.45% of covered wages and has no annual wage-base ceiling. The employer must also withhold the 0.9% Additional Medicare Tax after wages it pays to the employee exceed $200,000 in the calendar year. The trigger does not change for filing status or spouse wages.
Final Additional Medicare Tax liability does use filing-status thresholds and can differ from employer withholding. Use the 2026 Additional Medicare Tax Calculator after establishing the return-level Form 8959 wage and self-employment amounts. Do not subtract the paycheck amount from wages or treat it as the final liability.
Exercise cost and tax withholding are different cash uses
Exercise cost equals shares multiplied by the contractual exercise price. Federal withholding is calculated from the supported wage spread. If both were paid with cash, their sum is the modeled cash funding need before commissions, state or local tax, plan fees, or rounding. The employer or broker may instead sell shares, withhold shares, or net cash through a cashless exercise.
The result converts exercise cost plus modeled federal withholding into a fractional share equivalent at the entered FMV. This is a planning comparison, not the number of shares a broker will sell. Execution price, fees, required whole-share rounding, plan procedures, blackout restrictions, and state deductions can change the actual transaction.
A same-day sale is still a stock sale
A cashless exercise often combines an option exercise with an immediate market sale. The wage spread remains a compensation event under the supported path, while the sale is a separate transaction that can create a capital gain or loss based on sale proceeds, supported basis, fees, and lot identity. A small price change between payroll valuation and execution can create a small gain or loss.
This calculator does not ask for a sale price because doing so would make a two-event transaction look like one tax formula. Reconcile the exercise confirmation, trade confirmation, payroll statement, Form W-2, Form 1099-B, and Form 8949 path separately.
Initial basis includes compensation already recognized
Publication 525 states that basis in property acquired under the option is the amount paid plus any amount included in income upon grant or exercise. Under the supported positive-spread case, exercise price plus Code V wage income commonly produces an initial per-share basis equal to the payroll FMV. When FMV is below exercise price and the modeled wage spread is zero, the amount paid remains the starting basis.
For options granted on or after January 1, 2014, Publication 525 warns that basis information reported on Form 1099-B will not reflect an amount included in income upon grant or exercise. Copying an incomplete broker basis can tax the Code V compensation again. Maintain a lot ledger even if the brokerage account shows an unrealized gain or loss.
Use the 2026 Long-Term Capital Gains Tax Calculator only after sale proceeds, adjusted basis, holding period, loss netting, and eligible gain are established. It does not calculate Code V wages or correct broker basis.
Do not use the ISO AMT shortcut
NSOs and ISOs do not share the same exercise-year tax treatment. The supported NSO path creates W-2 compensation at exercise and does not use Form 3921. A qualifying ISO can avoid regular wage income at exercise while creating a possible Form 6251 adjustment. Entering an NSO spread in the ISO calculator can incorrectly replace payroll wages with an AMT-only amount.
For one supported ISO lot, use the 2026 ISO AMT Adjustment Calculator. For a supported stock-settled restricted stock unit event, use the 2026 RSU Tax Withholding Calculator. ESPP purchases and dispositions require their own Form 3922 and holding-period analysis; use the 2026 ESPP Tax and Cost Basis Calculator for one supported Section 423 sale lot.
Former employees and special wage reporting require review
The W-2 instructions include former-employee NSO exercises, but a former employee can have different payroll timing, withholding funding, special wage reporting, or Social Security benefit interactions. IRS Publication 957 also identifies certain later-year option exercises as special wage payments for Social Security earnings-test purposes.
This calculator excludes the former-employee path so a simple withholding result is not mistaken for a complete reporting answer. Obtain the employer’s payroll statement and current guidance, especially when regular wages were not paid, retirement benefits have begun, or the exercise occurs years after service ended.
State, local, and international rules are outside the estimate
States can source option compensation based on work performed during a grant-to-vest or grant-to-exercise period, residence, employer location, or other rules. More than one jurisdiction can claim part of the wage. A move between states does not make the entire exercise taxable only where the employee lives on exercise day.
Cross-border grants can involve treaty, foreign tax credit, payroll, residency, currency conversion, securities, and employer reporting questions. Choose the special path instead of using a U.S. federal estimate as the whole answer.
Three useful examples
Ordinary exercise below payroll thresholds
An employee exercises 1,000 shares at $10 when payroll FMV is $25. The exercise cost is $10,000 and Code V wage spread is $15,000. With no prior supplemental wages, $3,300 is modeled at 22%. If prior Social Security and Medicare wages are $120,000, Social Security withholding is $930 and regular Medicare withholding is $217.50. No Additional Medicare withholding applies, so modeled federal withholding is $4,447.50.
The exercise crosses the Social Security and Medicare thresholds
A $20,000 Code V spread follows $180,000 of Social Security wages and $195,000 of Medicare wages. Only $4,500 remains under the Social Security base, while all $20,000 remains subject to regular Medicare. The final $15,000 lies above the employer’s $200,000 Additional Medicare trigger.
Exercise price exceeds payroll FMV
An employee exercises 100 shares at $30 when payroll FMV is $25. The simplified positive wage spread is zero, exercise cost is $3,000, and initial basis begins with the $3,000 paid. The result does not say the exercise was advisable or that no special reporting applies.
A practical exercise-day workflow
- Verify NSO classification and whether the option had a readily determinable value at grant.
- Confirm that acquired shares are substantially vested at exercise.
- Record grant identifier, shares, exercise price, exercise date, and employer payroll FMV.
- Confirm the employer’s Code V wage and supplemental-wage withholding method.
- Reconcile prior supplemental, Social Security, and Medicare wages.
- Separate exercise cash, payroll withholding, market sale, fees, and shares retained.
- Create a lot-level basis record using amount paid plus compensation recognized.
- Update the full-year return and payment projection.
- Test employer-stock concentration and downside risk before deciding what to retain.
Official sources and 2026 limitations
The option classification, ordinary NSO exercise-income timing, substantial-vesting rule, W-2 Code V treatment, basis formula, and post-2013 Form 1099-B warning come from IRS Topic 427, Publication 525, and the 2026 W-2 and W-3 instructions.
The optional 22% separately identified supplemental-wage method, mandatory 37% rate above $1 million, aggregate-method alternative, Social Security and Medicare rates, and $200,000 employer Additional Medicare withholding trigger come from 2026 Publication 15. The $184,500 Social Security base comes from the SSA contribution and benefit base table.
This calculator provides educational 2026 U.S. federal payroll arithmetic for one narrowly supported employee NSO exercise. It is not tax preparation, payroll processing, tax, legal, accounting, valuation, investment, securities, equity-compensation, or financial advice. It does not determine option type, grant-date value, substantial vesting, FMV, Code V reporting, wage timing, withholding method, exercise funding, state or foreign sourcing, basis adjustments, capital gain or loss, final income tax, refund, balance due, penalties, or investment suitability. Verify every input and result with current plan, employer, payroll, broker, IRS and SSA records, software, and qualified guidance before exercising, selling, filing, paying, or changing withholding. Official sources were accessed July 28, 2026.