By Kevin Luu, Co-Founder and Chief Learning Officer. Reviewed on 2026-09-30.
Vesting share options means earning the right to buy company stock at a fixed price (the strike price) over time, usually on a schedule such as four years with a one-year cliff. A vested option is not a share you own. It is a right you still have to pay for (exercise) before a deadline, and that deadline can shrink to about 90 days if you leave the company.
For a two-income household in California or Washington with stock options at a private or newly public employer, the vesting schedule matters less than three dates it sets in motion: when options become exercisable, when they expire, and what happens to them if you change jobs. Those dates decide how much cash and tax you need, and when.
Vested, exercised and sold are three different events
Restricted stock units turn into shares automatically at vest. Options do not. With options there are three separate events, and each one has its own tax result:
- Vest. You earn the right to buy a block of shares at the strike price. No tax for either ISOs or NSOs, and nothing lands in your brokerage account.
- Exercise. You pay the strike price and receive shares. For nonqualified stock options (NSOs), the spread between the share value and the strike is wage income on your W-2 (IRS Topic 427). For incentive stock options (ISOs), there is no regular income tax at exercise, but the spread counts for the alternative minimum tax (AMT).
- Sale. You sell the shares. Gain above your basis is a capital gain, short or long term depending on how long you held the shares. For ISO shares, a sale within two years of grant or within one year of exercise (a disqualifying disposition) turns the exercise spread into ordinary income instead (IRC §422(a)(1)).
Families often treat a vesting notice from the equity portal as income they already have. With options, it is a decision they now face.
How option vesting schedules usually work
Each grant agreement sets its own terms, so read yours. The common pattern at technology and biotech employers is a four-year schedule with a one-year cliff: nothing vests for the first 12 months, 25% vests at the one-year mark, and the rest vests monthly or quarterly over the next three years. Some companies front-load vesting, some use performance or milestone vesting, and refresher grants usually start their own clock.
Three other terms in the grant matter as much as the schedule:
- Expiration. ISOs must expire no later than 10 years after grant under IRC §422(b)(3). Most NSO plans also use 10 years. Vested options left unexercised at expiration are simply lost.
- Post-termination exercise window. Many plans give you 90 days after you leave to exercise vested options. Some companies offer longer windows. Unvested options are generally forfeited when employment ends.
- Acceleration. Some grants vest faster on a sale of the company, either at the deal (single trigger) or only if you are also let go after the deal (double trigger). Our note on what happens to your stock if a company sells covers this.
The ISO three-month rule when you leave a job
ISOs keep their tax treatment only if you exercise while employed or within three months after you leave (one year if you leave because of disability), under IRC §422(a)(2). Exercise after that, even if your company’s plan allows a longer window, and the options are taxed as NSOs.
A second ISO limit catches larger grants: if more than $100,000 of stock (valued at its fair market value on the grant date) first becomes exercisable in one calendar year, the excess is treated as NSOs under IRC §422(d). A big grant with fast or accelerated vesting can end up partly ISO and partly NSO.
Worked example: 15,000 vested options at a private biotech
Assumptions, for illustration only. A married couple in the Bay Area files jointly. One spouse is a scientist at a private biotech; the other is a physician. W-2 pay is about $1.2M, and California taxable income is about $1,050,000 before any option exercise. The scientist holds 40,000 options with a $2 strike, four-year vesting, one-year cliff, monthly after that. At month 18, 15,000 options have vested (10,000 at the cliff plus 6 months of 833). The latest 409A value is $12 a share. The scientist’s salary is already above the 2026 Social Security wage base of $184,500, so no Social Security tax applies to the spread.
| Item | Amount |
|---|---|
| Cash to exercise (15,000 x $2) | $30,000 |
| Spread at exercise (15,000 x $10) | $150,000 |
| If NSOs: federal income tax at 37% | $55,500 |
| If NSOs: California tax at 11.3% + 1% (2025 rates, income over $1M) | $18,450 |
| If NSOs: Medicare 1.45% + 0.9% Additional Medicare Tax | $3,525 |
| If NSOs: California SDI at 1.3% | $1,950 |
| If NSOs: total tax on the spread | about $79,400 |
| If ISOs: regular tax at exercise | $0 (AMT exposure instead) |
Two things stand out. First, as NSOs, this exercise costs about $109,400 in cash and tax for shares the family cannot yet sell. Second, federal withholding on the spread is typically the 22% supplemental rate, which is $33,000 here, against a 37% federal bracket. That leaves roughly $22,500 of federal tax to cover with estimated payments or at filing.
If the options are ISOs, the $150,000 spread is added to AMT income. For 2026, the joint AMT exemption of $140,200 starts phasing out at $1,000,000 of AMT income, at 50 cents per dollar, so a household at this income has little or no exemption left (Rev. Proc. 2025-32). The AMT owed depends on the whole return, so it should be modeled before exercising, not after. California has its own AMT as well (Schedule P (540)).
Now suppose the scientist takes a new job at month 18. The 25,000 unvested options are forfeited. The family has about 90 days to decide whether to spend roughly $30,000 plus possible AMT (as ISOs) or about $109,400 in total (as NSOs, or as ISOs exercised after three months) on illiquid private stock, or walk away from $150,000 of paper value.
California versus Washington for option holders
In California, the NSO spread is taxed as ordinary wages, including SDI at 1.3% for 2026 with no wage cap (EDD), and later gains on the shares get no lower capital gains rate (FTB).
In Washington, there is no wage income tax for 2026 (DOR), so the same $150,000 NSO spread would cost about $59,000 in federal income and Medicare tax and no state tax. A later sale of shares held more than a year can owe Washington’s 7% capital gains tax on gains above the standard deduction ($278,000 for 2025), rising to 9.9% on taxable gains above $1,000,000 (DOR). Washington has also enacted a 9.9% income tax on AGI above $1,000,000 starting January 1, 2028 (DOR), which could affect high earners exercising NSOs from that year; DOR has not yet published the details.
Moving from California to Washington does not erase California’s claim. California generally taxes the part of an option’s income tied to days you worked in California between the grant date and the exercise date, or the date your employment ended if earlier (FTB Publication 1004).
The decisions a family actually has to make
- Exercise now, later or never. Early exercise at a low 409A value keeps the spread and the tax small, but puts cash at risk in a company that may never have a liquid exit.
- How much to exercise. Exercising part of the vested options each year can keep ISO spreads under the level that triggers a large AMT bill.
- Early exercise and 83(b). If the plan lets you exercise before vesting, an 83(b) election filed within 30 days of the exercise can start the capital gains clock early. See drafting a Section 83(b) election letter.
- Cashless exercise at a public company. Once shares trade, you can exercise and sell at the same time, which avoids putting up cash but makes the full spread taxable. See tax on a cashless exercise.
- Job changes. Before resigning, list every vested grant, its type, strike price, expiration and the post-termination window, and decide which options to keep.
Private-company holders sometimes get a liquidity chance through a company-run tender offer; our explainer on how a tender offer works covers the mechanics.
Common mistakes with vested options
- Letting the 90-day window pass after a job change because nobody tracked it.
- Exercising ISOs late in the year without modeling AMT, then selling at a lower price after the AMT is already owed.
- Relying on 22% supplemental withholding on an NSO exercise in a 35% or 37% bracket.
- Treating private-company options as part of the college or home budget before there is a market for the shares.
- Holding so much employer stock after exercise that one company drives the family’s finances.
What to write down for your kids
Equity decisions are where children most often see the result (a new house, a tense year) without the reasoning. A one-page note for each major exercise decision, covering what you owned, what you chose, why, and what you would do differently, is a record your kids can read when they get their first offer letter with equity in it. As Kevin Luu puts it: “Your kids don’t need to inherit your portfolio. They need to inherit your decision-making process.”
Frequently asked questions
Do I pay tax when my stock options vest?
No. Vesting alone does not create tax for ISOs or NSOs. Tax starts at exercise: NSO spreads are wage income on your W-2, and ISO spreads count for AMT. This is different from RSUs, which are taxed as wages when shares are delivered at vest. If your employer grants both, track them separately so you do not plan for tax on the wrong date.
What happens to vested options if I am laid off?
Vested options usually stay yours for the post-termination exercise window in your plan, often 90 days, and unvested options are generally forfeited unless a severance agreement or acceleration clause says otherwise. ISOs exercised more than three months after employment ends are taxed as NSOs. Ask HR for the exact dates in writing as soon as you are notified.
Can vested options expire while I still work there?
Yes. Options have a fixed term, usually 10 years from grant, and ISOs cannot exceed 10 years by law. Long-tenured employees at private companies sometimes reach expiration on early grants without ever having a chance to sell. Check each grant’s expiration date and plan exercises before the final year.
Next step: pull your grant summaries from the equity portal and build one table of grant type, strike, vested count, expiration and exit window. If you want a second set of eyes on the exercise and tax plan, the Tax & Wealth Assessment is where we start with families, or see our tax management and investment risk management services.
This is general education, and the right move depends on the family’s full picture.
Kevin has advised high-income W-2 tech and biotech families since 2015, and leads the education-first Age Five Family Office from Brea, California.
Connect on LinkedIn → · About KevinThis is part of how we approach Tax Management for high-income W-2 families at Bright Advisers.
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