Procedure · Equity exercise
How to exercise stock options
An option exercise is the moment a grant turns into actual ownership. It is a share issuance with a strike payment, a withholding obligation, and four records that have to agree on the same day: the option ledger, the share register, the cap table, and the minute book. The procedure below walks the exercise in order and identifies where the tax treatment turns.
Quick facts
Stock option exercise
| When | On receipt of the exercise notice and the strike payment |
|---|---|
| Initiated by | The grantee (the employee, former employee, director, or other grant holder) |
| Effect | The corporation issues shares to the grantee for the strike paid |
| Records updated | Option ledger, share register, cap table, minute book, payroll/tax reporting |
At a glance
- Exercise is effective when the corporation receives a completed notice and the strike payment
- NSO spread is ordinary compensation income; ISO spread is an AMT preference
- Share issuance on exercise updates the share register the same day
- The post-termination exercise window is governed by the plan and the grant, not negotiated at termination
- Year-end reporting (Form 3921, W-2, T4, ERS return) is where errors surface most often
On this page
Steps
Confirm the vested-and-unexercised balance
The exercising party (employee, former employee, or other grantee) confirms with the corporation the number of options vested and unexercised as of the intended exercise date. The figure is the cumulative vested options under the grant's vesting schedule, less any prior exercises, less any forfeitures. The post-termination exercise window may limit the time available to exercise vested options after the grantee leaves the corporation.Deliver the exercise notice
The grantee delivers a written exercise notice that identifies the grant, the number of options being exercised, the exercise date, and the chosen exercise method (cash, cashless, net exercise, or other method permitted by the plan). The notice is in the form attached to the option agreement. The exercise date is the date the corporation receives a completed exercise notice and the required payment.Receive the strike price payment
The grantee pays the strike price (strike per share multiplied by the number of options exercised) in the form the plan permits. Cash is the default. The plan may permit cashless or net exercise (where the corporation withholds shares with fair market value equal to the strike) or stock swap (where the grantee tenders previously held shares). The payment must clear before the share issuance is effective.Calculate and withhold tax on the exercise
For an NSO exercise, the spread (fair market value on exercise minus strike) is ordinary compensation income, and the corporation withholds federal and state income tax and applies FICA on the spread. For an ISO exercise, there is no regular income tax withholding, but the spread is an AMT preference item for the grantee and the corporation has an information-reporting obligation (Form 3921 for the year of exercise). For Canadian section 7 options, the spread is employment income subject to source deductions, with the section 110(1)(d) deduction applied if the option meets the prescribed-share rules.Issue the underlying shares to the grantee
After payment clears and withholding is satisfied, the corporation issues the shares. The board has typically pre-authorized issuance under the equity plan, so a separate board resolution is not required for each exercise. The shares are issued in the grantee's name with a certificate (or uncertificated entry) bearing the legends required by the plan and by securities law (Rule 144 restrictive legend for unregistered shares in the US, equivalent restrictive notation in other jurisdictions). See how to issue shares.Update the share register, option ledger, cap table, and minute book
The same day the shares are issued, the share register records the issuance (new certificate number, share count, class, consideration equal to the strike paid plus any deemed wage), the option ledger records the exercise against the grant (reducing the vested-and-unexercised balance), the cap table moves the exercised options from outstanding-option to issued-share status, and the minute book retains the exercise notice, the receipt of payment, and any withholding documentation alongside the grant resolution.Track the holding period and report at year end
After exercise, the corporation tracks the holding period for ISO qualifying-disposition purposes (two years from grant, one year from exercise) and reports the exercise on the year-end statutory forms: Form 3921 for ISO exercises and Form W-2 for NSO exercise spreads in the US, T4 box 38/39 for Canadian employee stock option benefits, and HMRC employment-related securities reporting in the UK. Misreporting at year end is the most common source of post-exercise corrections.
Jurisdiction notes
The mechanics are similar across jurisdictions; the tax characterization differs:
- Delaware (DGCL). Share issuance on exercise under DGCL § 152 (consideration). The board's prior authorization under the plan covers the issuance, so no separate resolution is required per exercise. The shares carry Rule 144 restrictive legends until registered or eligible for resale. View jurisdiction guide
- California. California Corporations Code § 408 governs the share issuance. California treats the spread as wages for state income tax withholding on NSO exercises; ISO exercise withholding follows federal (no regular withholding, AMT for the grantee). View jurisdiction guide
- Canada (CBCA). Share issuance under CBCA s. 25. Employee stock option benefit taxed under Income Tax Act s. 7 with the s. 110(1)(d) deduction (50% of the benefit, similar to capital gains treatment) if the option meets the prescribed-share, fair-market-value, and arm's-length conditions. CCPC option holders may defer recognition until disposition under s. 7(1.1). View jurisdiction guide
- Ontario (OBCA). Share issuance under OBCA s. 25. Tax treatment parallel to federal under Income Tax Act s. 7. Ontario CCPCs benefit from the same CCPC option deferral. View jurisdiction guide
- United Kingdom. Exercise of an EMI option granted under ITEPA 2003 Sch. 5 at or above the actual market value on grant produces no income tax or NICs on exercise; the gain is capital and may qualify for Business Asset Disposal Relief. CSOP exercises within the qualifying conditions are similarly free of income tax on exercise. Unapproved option exercises are taxed as employment income on the spread, with PAYE and NICs through payroll, plus an Employment Related Securities annual return to HMRC. View jurisdiction guide
Common mistakes
- Exercise notice without payment. The grantee signs and returns the exercise notice but doesn't send the strike payment. The corporation treats this as a complete exercise, updates the records, and issues shares. The strike receivable is now an unsecured loan to the grantee that the plan probably doesn't permit.
- NSO exercise without withholding. A former employee exercises an NSO years after leaving. The corporation issues the shares but doesn't withhold or report the spread. The grantee receives no W-2, doesn't report the income, and a CP2000 notice follows two years later.
- Same-day sale of an ISO without flagging the disqualifying disposition. The grantee exercises an ISO and sells the shares the same day. The corporation issues a Form 3921 (ISO exercise) but not a W-2 (the disposition is disqualifying and the spread should be wage income). The grantee files inconsistent returns.
- Records updated days or weeks later. The shares are issued on day 1 but the share register, option ledger, and cap table are updated on day 30. In the gap, another grant is approved against the old pool balance and exceeds the limit.
- Post-termination window missed. The grantee leaves on March 1. The plan provides a three-month exercise window, ending June 1. The grantee exercises on June 5. The corporation either honours the exercise (creating a 422 problem if the option was an ISO) or refuses it (creating an employee-relations problem). The window should be communicated in writing at termination.
In Octelligence
Exercise that updates the ledger, the register, and the cap table together.
Octelligence treats the exercise as one event with four updates: the option ledger records the exercise against the grant, the share register issues the new shares, the cap table moves the position from option to issued, and the minute book stores the notice, the payment, and the withholding record. The tax reporting export pulls from the same data the next year.
See Cap Tables & FinancingFAQ
Common questions
Cash exercise: the grantee pays the strike price in cash and receives the full number of shares underlying the exercised options. Cashless exercise: a broker funds the strike payment by selling some of the underlying shares in the market on the exercise date (requires a public market, so private corporations rarely permit it). Net exercise: the corporation issues fewer shares than the options exercised, withholding shares with a fair market value equal to the strike payment (and sometimes additional shares for tax withholding). Each method must be expressly permitted by the plan and the grant agreement.
Only if the plan and the grant permit early exercise. When early exercise is permitted, the unvested options are exercised but the resulting shares are subject to a repurchase right in favour of the corporation that lapses as the original vesting schedule would have vested. The grantee typically files a Section 83(b) election within 30 days of exercise to start the capital-gains holding period and avoid ordinary-income recognition as the repurchase right lapses.
It's the period after the grantee leaves the corporation during which vested-and-unexercised options can still be exercised. Three months is the statutory minimum for ISO qualification under IRC § 422 (for termination other than death or disability; longer for those). Some plans extend the window to 10 years, which disqualifies the option as an ISO but improves the grantee's economic position. The window is set by the plan and the grant agreement, not by negotiation at termination.
You've made a disqualifying disposition. The favourable ISO tax treatment (capital gains on the entire gain, no AMT on the exercise) is lost. The spread on exercise is treated as ordinary compensation income on Form W-2 in the year of disposition, and any additional gain or loss is short-term capital. A qualifying disposition requires holding the shares at least two years from grant and at least one year from exercise.
The grantee owes the tax; the corporation withholds it. For US NSO exercises, federal income tax (typically at the supplemental wage rate), state income tax (where applicable), Social Security (up to the wage base), and Medicare are withheld on the spread. The grantee can pay the withholding in cash alongside the strike, or the corporation may permit share withholding (issuing fewer shares to cover the tax). The withholding obligation is the same whether the grantee is a current or former employee.
Yes. Each exercise is a separate share issuance and gets its own register entry with a unique certificate number (or uncertificated entry). Bundling multiple exercises into a single certificate creates a reconciliation problem because each exercise has its own grant date, strike price, and holding-period clock. The certificates carry the restrictive legend required by the plan and securities laws.
Exercises that close cleanly
From exercise notice to register entry in one workflow.
Notice, payment, withholding, share issuance, and reporting all tied to the original grant, with the cap table and the option ledger updating together.