Stock Options
Options follow different rules than RSUs. Start here if you are deciding when to exercise or trying to decode grant paperwork.
Rates and rules change. Content is reviewed for tax year 2026. Check the last-reviewed date and methodology on each page, then confirm against IRS or state guidance before you file.
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Email usStock options are not RSUs. RSUs are delivered shares taxed as wages at vest. Options are the right to buy shares — tax hits at exercise (NSO wages, ISO possible AMT) and again at sale depending on holding periods.
Restricted stock and early-exercise grants add 83(b) deadlines. Private-company employees also need a liquidity plan before exercising.
Documents for option tax planning
Educational checklist — gather these before running calculators or filing. Your plan administrator may use different labels.
- Grant agreement ( vs , strike price, expiration)
- Exercise confirmation and Form 3921 () or wage detail ()
- 409A or latest used by the company for private shares
- confirmation if you early-exercised
- Post-termination exercise window dates from the plan
- confirmation from your equity portal (date, shares, , )
- Pay stub from the pay period ( lines)
- for the year (Box 1 wages, state boxes if applicable)
- for any share sales (proceeds and reported basis)
Common stock option mistakes
Confusing ISO and NSO tax treatment
NSOs usually create wage income at exercise. ISOs may defer regular tax but trigger AMT on the spread. The exercise button is not interchangeable between grant types.
Exercising without cash for AMT or withholding
ISO exercises can produce a large AMT bill without selling shares. NSO exercises often require cash for withholding on the spread. Model both before you click exercise.
Missing the 83(b) election deadline
For eligible early exercises, IRS rules require an 83(b) election within 30 days of purchase. There is no extension. Missing the window changes your entire timeline.
Forgetting post-termination exercise windows
After you leave, ISO and NSO windows shrink. Unexercised options may expire while you are still sorting out tax planning from your final vest.
Start here: what kind of equity do you have?
Pick the branch that matches your grant type or situation. Each path states the core tax question, links to guides and calculators, and flags a common cash or documentation pitfall.
I have RSUs
Core question: When do RSUs become taxable wages, and how does that connect to W-2 and later 1099-B sales?
Vest income is taxed when shares deliver — not at grant. Withholding on the vest is not your final tax if salary and bonus stack you into a higher bracket.
I have ISOs
Core question: Does exercising ISOs trigger AMT on the spread even if I do not sell, and what happens on a later sale?
AMT on exercise can require cash before you have liquidity — model tax before exercising, especially at private companies.
I have NSOs
Core question: Is the spread at exercise ordinary wage income, and how does withholding on exercise compare to my bracket?
NSO spread is generally wages at exercise — you may owe tax even if you hold shares and cannot sell yet.
I early-exercised shares
Core question: Did I file an 83(b) election within 30 days, and how does that change when I recognize income?
The 83(b) deadline is strict — missing it generally means income is recognized later when restrictions lapse, often at higher FMV.
I need to file or missed an 83(b)
Core question: What proof do I have that an 83(b) was mailed on time, and how does the IRS expect it to be reported?
If the 30-day window passed without an election, you generally cannot undo that — document what you filed and when before amending anything.
I am leaving the company
Core question: What vests, what forfeits, and how long do I have to exercise options after termination?
Post-termination exercise windows are often 90 days for ISOs — missing the window can convert favorable treatment into ordinary income paths.
My company is private
Core question: Can I sell shares to pay tax, and what valuation (409A) applies at exercise?
Tax is often due at exercise or 83(b) before any IPO liquidity — plan cash for AMT or NSO wages without assuming a near-term sale.
My company is doing a tender offer
Core question: How is tender offer income reported compared to an open-market sale, and what basis applies?
Tender offers can compress sales into one tax year — check whether proceeds are wages, capital gain, or both on your offer documents.
I sold shares in a secondary sale
Core question: Is secondary sale income capital gain, ordinary income, or a mix depending on share type and holding period?
Private secondary sales may not generate standard 1099-B basis — keep purchase/exercise records and the platform's tax statement.
Which page should I read?
Do you have ISOs (incentive stock options)?
If yes → Start: How ISOs are taxedIf no → Start: NSO exercise tax
RSUs vs ISOs vs NSOs vs restricted stock (plain English)
RSUs: shares delivered at vest; wage income at vest; simpler timing, less control.
NSOs: you choose when to exercise; spread taxed as wages at exercise; cash needed for tax.
ISOs: no regular wage tax at exercise if requirements met, but AMT on spread is common; qualifying sales may get capital gain treatment.
Restricted stock (not RSU): may allow 83(b) within 30 days of grant/purchase to accelerate income — different from standard RSU plans.
Liquidity matters for private company employees
Exercising creates tax before you can sell on a public market. Secondary sales and tender offers have their own reporting rules. Model tax before you exercise — not after you need cash to pay AMT.
Quick links
Sources and notes
Primary tax claims on this page are supported by the official and secondary sources below. Broker and software links describe reporting mechanics — confirm rules against IRS or state guidance.
RSU vest wages vs ISO/NSO exercise timing and calculator comparison.
- IRS — U.S. taxation of stock-based compensation (RSU vesting and W-2 reporting)
Internal Revenue Service · Official
Describes RSU income at vest, W-2 reporting in boxes 1/3/5, and ordinary income treatment.
- IRS Topic 427 — Stock options
Internal Revenue Service · Official
Overview of statutory (ISO, ESPP) vs nonstatutory options, exercise timing, and Form 3921/3922 reporting.
- Filing taxes for restricted stock, RSUs, or performance awards (tax guide PDF)
Fidelity Stock Plan Services · Brokerage explainer
Explains W-2 vest income, 1099-B with $0 basis, supplemental adjusted cost basis, and Form 8949 reporting.
Confirm any tax outcome with your documents and a qualified tax professional. See our editorial standards for how we source and update pages.
All stock options
Stock Options vs RSUs
Options and RSUs follow different tax paths — know which events create wage income vs capital gain.
ISO vs NSO Tax Difference
ISOs and NSOs are taxed differently — the exercise and sale timeline drives most of the difference.
How ISOs Are Taxed
ISO tax is a sequence: usually no tax at grant, possible AMT at exercise, capital gain treatment on qualifying sales.
ISO AMT Explained
AMT can make an ISO exercise expensive in cash even before you sell shares — understand the spread first.
ISO Exercise Tax Calculator Guide
A short guide to our ISO AMT calculator: what it estimates, what it cannot, and what to gather first.
NSO Exercise Tax Explained
NSO exercise is usually a paycheck event — wage income, withholding, and possible cash due without a sale.
NSO Withholding Explained
Withholding on NSO exercise can mirror RSU gaps — flat rates may not match your actual bracket.
Exercising Options Before IPO
Exercising before IPO can trigger tax before you have liquidity — plan cash, AMT, and 83(b) carefully.
Exercising Options After Leaving a Company
After you leave, exercise deadlines and tax on spread can collide — know your plan terms and tax timing.
Early Exercise and 83(b) Election
Early exercise with 83(b) accelerates income recognition — powerful but deadline-driven.
83(b) Election Explained
An 83(b) election tells the IRS to tax restricted stock at grant value now instead of at vest.
What Happens If You Miss the 83(b) Deadline?
Missing the 83(b) deadline usually means income is recognized at vest, not at early exercise — plan accordingly.
Private Company Equity Tax Guide
Private company equity tax is as much about cash and timing as rates — know when tax hits before you can sell.
Tender Offer Tax Guide
Tender offers can combine wage reporting and stock sales — save confirmations and plan for withholding.
Secondary Sale Tax Guide
Secondary sales may trigger capital gain reporting and company transfer restrictions — document every step.
Startup Equity Tax Checklist
Use this checklist to avoid missing elections, exercise windows, and tax payments before you have cash to pay.
ISO Stock Options Tax Treatment
ISO tax treatment from grant through sale — how it differs from RSUs and NSOs, and which forms you will see.
ESPP Tax Guide
ESPP tax splits between discount income (often wages) and post-purchase capital gain depending on how long you hold shares after purchase.
ISO Disqualifying Disposition
Selling ISO shares before statutory holding periods are met is a disqualifying disposition — part of the bargain element may reappear as wages on your W-2.
ISO Qualifying Disposition
Qualifying ISO sales meet holding periods after grant and exercise — gain may qualify for capital gain treatment instead of spread recharacterized as wages.
ESPP Qualifying Disposition
Qualifying ESPP sales meet statutory holding periods — discount and gain reporting may differ from disqualifying sales on W-2 and 1099-B.
NSO Same-Day Sale
A same-day NSO sale creates wage income on the spread at exercise and a small capital gain or loss on any price change between exercise and sale.
ESPP Disqualifying Disposition
A disqualifying ESPP sale usually means more purchase discount lands on your W-2 as wages — reconcile plan dates, W-2, and 1099-B before filing.
NSO Exercise and Hold
NSO spread at exercise is wage income on your W-2 even if you never sold — later sales use exercise-date FMV as basis on Form 8949.
ISO AMT Credit Explained
Minimum tax credit from ISO exercise AMT may offset regular tax in later years — track Form 6251 carryforward lines so sale-year software matches your records.
AMT on ISO Exercise Explained
The ISO bargain element may be an AMT preference item at exercise — often with no employer withholding on the spread.
ISO Exercise Tax Basics
ISO tax usually splits between exercise-year AMT and sale-year outcomes — NSOs tax the spread as W-2 wages at exercise instead.
NSO Exercise Pay Stub Withholding
NSO spread hits pay stub as supplemental wages — withholding is a payroll estimate, not your final tax.