November 9, 2026 · 8 min read
RSU vs Stock Options: Key Differences Explained
Two common stock awards for employees: one hands you shares, the other lets you buy them at a set price. What each is worth and how it is taxed.
- Equity compensation
RSU vs stock options comes down to whether you pay for the shares. A restricted stock unit (RSU) gives you a share when it vests, at no cost. A stock option gives you the right to buy shares later at a fixed price, called the strike price. RSUs keep some value unless the stock becomes worthless. Options pay only if the stock rises above the strike.
If your employer offers one or the other, the choice shapes your risk and your tax bill. RSUs are taxed as pay when the shares arrive. Options cost you cash to exercise, and the tax depends on the type of option and when you sell.
100%
Lowest strike for an incentive stock option, as a share of the stock’s value on the grant date
10 years
Longest an incentive stock option can stay open after it is granted
$100,000
Stock value per year that can first become exercisable as incentive options
22%
Flat federal withholding rate an employer may use on RSU income up to $1 million a year
General Information, Not Tax Advice
This page describes US federal rules as they stand in November 2026, with illustrative numbers. Your award agreement and plan set the details that matter: vesting, exercise windows and what happens when you leave. Read them, and check your own case with a qualified tax adviser.
Restricted Stock Units vs Stock Options: What Is the Difference?
Read stock options vs RSU from the employee’s side, and the question is what you must pay and when you are taxed. The table compares RSU vs options on what each is, who uses it, the legal and tax treatment, the risk, when you can get cash and a typical case.
An RSU is a share you receive. An option is a price you lock in, worth something only if the stock rises past it
As of November 2026 · 26 USC 422; Treas. Reg. §1.409A-1(b)(5); IRS Publications 525 (2025), 5992 (06.2024) and 15 (2026); IRS Topic 427. US federal rules.
In short, an RSU pays for the value a share has. An option pays only for the growth above the strike.
How Do RSUs Work?
An RSU is a promise. The IRS describes RSUs as unsecured, unfunded promises to pay cash or stock in the future. Typically, one unit stands for one share. Nothing is taxed at grant. When a unit vests, meaning it can no longer be lost, the company delivers the share or its cash value.
At a private company, units are often double-trigger. They need both time at the company and a liquidity event, such as an IPO or a sale, before they turn into shares. Until both happen, you hold units, owe no tax and cannot sell. If you leave before the time condition is met, the unvested units are gone.
How Do Employee Stock Options Work?
A stock option lets you buy shares at the strike price set on the grant date. Options vest over time, like RSUs. Once vested, you can exercise them, which means paying the strike to get the shares. If the shares are worth $20 and your strike is $10, each exercise buys $20 of stock for $10. If the shares are worth $8, the option is underwater and nobody would exercise it.
There are two kinds. Incentive stock options (ISOs) must meet Section 422. Their strike can be no lower than the stock’s value on the grant date. They can last no more than ten years and cannot be transferred. To keep ISO status, you must exercise while employed or within three months after you leave. Non-qualified stock options (NSOs) have none of these limits, and anyone who works for the company can get them. The ISO vs NSO guide compares the two.
Section 409A, the tax rule on deferred pay, adds one more condition. An NSO with a strike below the stock’s value on the grant date is generally treated as deferred pay, with heavy penalties if it breaks the 409A rules. That is why a private company sets the strike from a 409A valuation, an independent estimate of what its common stock is worth.
RSU vs Stock Options Taxes: When Each Is Taxed
RSUs are taxed once, at delivery, on the full value of the shares. That value is wages on your W-2, and payroll taxes apply. Your employer may withhold federal income tax at a flat 22%, often by keeping back some shares. After delivery, any further rise or fall is a capital gain or loss when you sell.
Options are taxed on the spread, the gap between the share value and the strike. With an NSO, the spread at exercise is wages, and payroll taxes apply. With an ISO, you owe no regular income tax at exercise. The spread can still count toward the alternative minimum tax, a parallel tax calculation. If you keep ISO shares at least two years after grant and one year after exercise, the whole gain is taxed as a capital gain when you sell. Sell sooner and part of it becomes ordinary income. Your employer reports an ISO exercise on Form 3921.
RSUs are taxed when you receive shares. Options are taxed when you choose to exercise, or at sale for ISOs
As of November 2026 · 26 USC 422; IRS Topic 427; IRS Publications 525 (2025), 5992 (06.2024) and 15 (2026)
One practical difference follows. With RSUs, the tax arrives on a date you do not choose. With options, you pick the exercise date, but you need cash for the strike and any tax. The RSU taxes guide and the guide on how to exercise stock options cover each side in detail.
RSU vs Stock Options Example: Five Possible Share Prices
A company’s shares are worth $10 today. It offers a new hire a choice: 1,000 RSUs, or options on 3,000 shares with a $10 strike. It offers three options per unit because an option is worth less than a share. The ratio is an assumption for this example. Here is what each grant is worth before tax at five share prices when it fully vests.
Illustrative grant, made up for this page. The 3-to-1 ratio is an assumption. Option value is 3,000 × (share price − $10 strike), before tax
Arithmetic on the stated assumptions · no market data
The two grants are worth the same at $15. Below that, the RSUs win, and at $10 or less the options are worth nothing. Above $15, the options pull ahead: at $40 they are worth $90,000 against $40,000. To get there, the holder must pay $30,000 to exercise all 3,000 options, unless the shares are sold in the same step.
Tax changes the picture further. At $20, the RSUs bring $20,000 of wages on delivery. If the options are NSOs exercised at $20, the $30,000 spread is wages at exercise. If they are ISOs held long enough, the $30,000 gain is taxed only on sale, as a long-term gain.
Stock Options vs Restricted Stock Units: Which Is Better?
Neither is better in general. The verdicts below say which suits whom.
Restricted Stock Units
- For
- No cash needed. Keeps value if the share price falls. Simple tax: wages on delivery, then a capital gain or loss.
- Against
- Taxed on a date you do not choose, even if you do not sell. Smaller upside per grant. At a private company, units can wait years for a liquidity event.
Verdict: RSUs suit someone who wants predictable value and has no cash to put in. They fit a company whose share price is already high and may not multiply. The trade-off is less upside and a tax bill each time shares arrive.
Stock Options
- For
- Large upside if the stock rises well above the strike. You choose when to exercise. ISOs can turn the whole gain into a long-term capital gain.
- Against
- Worth nothing if the stock does not rise. Exercising costs cash. ISOs can trigger AMT, and options can expire if you leave and do not exercise in time.
Verdict: options suit someone who expects the company to grow a lot and can afford to pay the strike. They reward growth and pay nothing for standing still. At a private company, exercising means paying cash for shares you may not be able to sell for years.
RSU vs stock options is a trade between value you keep and growth you buy. RSUs pay something in most outcomes. Options pay more when the stock rises past the strike, and nothing when it does not.
What This Means for You as an Employee
If you hold RSUs, find out when shares are delivered and how tax is withheld. Plan for the gap between the 22% withheld and your actual rate. At a private company, check whether your units are double-trigger and when they expire.
If you hold options, the key facts are the strike, the vesting schedule, the type (ISO or NSO) and the expiry date. Ask how long you have to exercise after leaving. Some plans let you buy shares before they vest, called early exercise. Others let you pay the strike by selling part of the shares, called a cashless exercise. For performance-based units, see PSU vs RSU. For the wider picture, see private company equity compensation.
Common Mistakes
- Comparing grants by count1,000 RSUs and options on 1,000 shares are worth very different amounts. Compare value at several share prices.
- Missing the exercise windowVested options can expire soon after you leave. An ISO exercised more than three months after you leave is taxed as an NSO.
- Forgetting the AMT on ISOsA large ISO exercise can bring an AMT bill in a year when you sold nothing.
- Assuming withholding covers the RSU taxThe flat 22% can fall short of your actual rate. Set money aside for the return.
- Exercising without a way to sellAt a private company, shares bought by exercise may be illiquid for years, and their value can fall.
The Terms This Page Uses
- Restricted stock unit (RSU)
- A promise to deliver a share, or its cash value, once it vests. Taxed as wages on delivery.
- Stock option
- The right to buy a set number of shares at a fixed strike price for a set period.
- Strike price
- The fixed price per share you pay when you exercise an option.
- Exercise
- Paying the strike price to turn vested options into shares.
- Vests
- Can no longer be lost. For RSUs, the units that turn into shares. For options, the ones you may exercise.
- Underwater
- An option whose strike is above the current share price, so exercising it would lose money.
- Incentive stock options
- Options that meet Section 422. No regular tax at exercise, possible AMT, long-term gain if the shares are held long enough.
- Non-qualified stock options
- Options outside Section 422. The spread at exercise is taxed as wages.
- Double-trigger
- An RSU that needs both time at the company and a liquidity event before it pays.
- 409A valuation
- An independent estimate of the value of a private company’s common stock, used to set option strikes.
Questions About RSUs and Stock Options
It depends on the share price. RSUs keep value if the price stays flat or falls. Options are worth more only if the price rises well above the strike. In the example on this page, the two break even at one and a half times the strike.
No. RSUs cost nothing. You pay tax when the shares are delivered, because their value counts as wages. Your employer often withholds part of the shares to cover it.
It depends on the type. NSOs are taxed as wages on the spread when you exercise. ISOs carry no regular tax at exercise, though the spread can trigger AMT. Both are taxed again on any gain when you sell.
Unvested RSUs and options are usually lost. Vested RSUs have already become shares, unless they are double-trigger units still waiting. Vested options must usually be exercised within a window set by the plan.
Yes. A company can grant either or both under its equity plan. At a private company, RSUs are often double-trigger, and option strikes are set from a 409A valuation.
Where Every Rule on This Page Comes From
Every rule and figure was checked against the US Code, federal regulations and the IRS on November 9, 2026. The worked example is illustrative arithmetic and uses no market data. Plan terms vary within these limits. State tax is not covered.
- 01Internal Revenue Service06.25.2024Publication 5992 — RSUs as unfunded promises, taxed at vesting; payroll taxes on option exercise
- 02US Code (Cornell LII)Current law26 USC 422 — ISO strike, 10-year term, 3-month rule, holding periods, $100,000 limit
- 03Internal Revenue Service09.24.2026Topic 427 — how statutory and non-statutory options are taxed
- 04Internal Revenue Service2025Publication 525 — no income from an NSO until exercise, when it has no readily determinable value
- 05Code of Federal Regulations (Cornell LII)Current textTreas. Reg. §1.409A-1(b)(5) — discounted options as deferred pay; ISOs excluded
- 06Internal Revenue Service2026Publication 15 — supplemental wage withholding at 22%, 37% above $1 million
- 07Internal Revenue Service09.24.2026Topic 409 — long-term gain after a holding period of more than one year
This page explains how a market works. It is not investment advice, not a recommendation of any security, strategy or company, and not an offer to sell or a solicitation to buy anything. Private companies may never list or be acquired, positions in them can be illiquid for years, and the entire amount invested can be lost. Figures are accurate as of the dates shown and change. Requirements for investor status, and the tax treatment of a private holding, differ by jurisdiction — the jurisdiction is named wherever this page discusses either. Prepared by the AXEVIL Capital research team. Tax rules described here are United States federal rules unless another jurisdiction is named; they change every year and depend on your own facts. Nothing here is tax advice — take your documents to a qualified adviser.
What closed on the private market in the past two weeks
The rounds that priced, the tender offers that opened and the listings that filed — with the structure of each deal and the date on every figure. Written by the team that reads the paperwork.
Where to go from here
Equity compensationWhat Are Restricted Stock Units (RSUs)? How They Work and ExamplesAn RSU, or restricted stock unit, is a company’s promise of shares that vest over time. How RSUs work at a private company, the second trigger and an example.
Equity compensationIncentive vs Non-Qualified Stock Options: Key Differences ExplainedISOs and NSOs are both stock options. The difference is tax: when each is taxed, the AMT risk of ISOs, who can receive them and a side-by-side example.
TaxesHow Are RSUs Taxed? Definition, How It Works and ExamplesRSUs are taxed as pay when the shares are delivered, then as a capital gain or loss when you sell. Withholding, private-company timing and a worked example.