Restricted Stock Units (RSU)
A form of equity compensation where the employer promises to deliver a specific number of company shares to an employee once predetermined vesting conditions are met, typically time-based.
What Are Restricted Stock Units (RSUs)?
Key Takeaways
- ✓RSUs are a promise from the employer to deliver shares of company stock to the employee after a vesting period, at no cost to the employee.
- ✓73% of S&P 500 companies use RSUs as their primary equity compensation vehicle (Equilar, 2024).
- ✓Unlike stock options, RSUs always have value as long as the company's stock price is above zero, because there's no strike price to worry about.
- ✓RSUs are taxed as ordinary income at vesting, based on the fair market value of the shares on the vesting date.
- ✓The shift from stock options to RSUs accelerated after the 2008 financial crisis, when underwater options (strike price above market price) failed to retain employees.
RSUs are the most popular form of equity compensation at public companies today, and for good reason. They're simple to understand, they always have value, and they create a strong retention incentive. Here's how they work. The company grants an employee a specific number of RSUs, say 1,000 units, with a 4-year vesting schedule. Each RSU represents a promise: "When this unit vests, we'll give you one share of company stock." The employee pays nothing. As RSUs vest (typically in quarterly or annual increments), the company delivers actual shares to the employee's brokerage account. At that point, the shares become the employee's property. They can hold them, sell them, or transfer them. The value of each RSU equals the company's stock price on the vesting date. If the stock is trading at $150 when 250 RSUs vest, the employee receives $37,500 worth of stock (before taxes). If the stock drops to $50, they receive $12,500. The value fluctuates with the market, but it's never zero unless the company goes bankrupt. This "always has value" characteristic is the primary reason RSUs replaced stock options at most large companies. During the dot-com bust and the 2008 recession, millions of stock options became worthless because the stock price fell below the exercise price. RSUs don't have that problem. A share of stock at $5 is still $5. It's disappointing, but it's not worthless.
How RSUs Work: From Grant to Sale
Understanding the full lifecycle of an RSU grant helps employees make better financial decisions at each stage.
Grant
The company approves an RSU award, specifying the number of units and the vesting schedule. The grant date is when the award is officially issued. At this point, the employee doesn't own any shares. They hold a promise of future shares. The grant isn't a taxable event. No income is recognized, no tax is owed. The number of RSUs granted is typically calculated by dividing a target dollar value by the stock price on or near the grant date. For example, if the target grant is $200,000 and the stock price is $100, the employee receives 2,000 RSUs.
Vesting
RSUs vest according to the schedule in the grant agreement. Common structures include: annual vesting (25% per year over 4 years), quarterly vesting (6.25% per quarter over 4 years), or front-loaded vesting (40% in Year 1, 20% each in Years 2 through 4). Some companies use a cliff (no vesting for the first year, then 25% cliff vest, followed by quarterly vesting). At each vesting date, the specified number of RSUs converts into actual shares. This is the taxable event: the fair market value of the shares on the vesting date is treated as ordinary income.
Tax withholding at vesting
The company withholds taxes on the vested shares. Most companies handle this through "sell-to-cover": they automatically sell enough shares to cover the tax obligation and deliver the remaining shares to the employee. For example, if 250 RSUs vest at $200/share ($50,000 value) and the combined federal, state, and FICA withholding rate is 42%, the company sells approximately 105 shares ($21,000) for taxes and delivers 145 shares to the employee. Some companies offer the option to pay the tax in cash (keeping all shares) or to have additional shares withheld beyond the minimum requirement.
Post-vesting decisions
Once shares are delivered, the employee faces a decision: hold or sell? From a tax perspective, any appreciation above the vesting price will be taxed as capital gains (short-term if sold within 1 year of vesting, long-term if held for over 1 year). From a risk perspective, holding means continued exposure to the company's stock price. Financial advisors generally recommend diversifying: sell vested shares and reinvest in a diversified portfolio, especially if a significant portion of your net worth is already tied to your employer through salary, benefits, and unvested equity.
RSUs vs Stock Options
RSUs and stock options are both equity compensation, but they work very differently. Understanding the differences is critical for evaluating job offers and managing your portfolio.
When RSUs are better
RSUs are better when: the stock price is expected to grow moderately (the guaranteed value matters more than unlimited upside), the employee is risk-averse and prefers certainty, the company is mature and the stock price is unlikely to 10x, or the employee wants simplicity and doesn't want to manage exercise decisions and tax elections.
When stock options are better
Stock options are better when: the company's stock price has significant growth potential (early-stage startup), the employee is willing to accept the risk of the options becoming worthless for the possibility of outsized returns, the employee can benefit from ISO tax treatment (long-term capital gains vs ordinary income), or the company's current valuation is low enough that the strike price provides meaningful upside potential.
| Feature | RSUs | Stock Options |
|---|---|---|
| Employee cost | $0 (free shares) | Must pay strike price to exercise |
| Value if stock price drops 50% | Still worth 50% of original value | May be worthless (if below strike price) |
| Upside potential | 1:1 with stock price | Potentially unlimited (if stock rises significantly above strike) |
| Tax timing | Taxed at vesting (no choice) | Taxed at exercise (employee chooses when) |
| Tax rate at vesting/exercise | Ordinary income | Ordinary income (NSO) or capital gains (ISO) |
| Complexity | Low (nothing to decide until post-vest) | High (when to exercise, ISO vs NSO, AMT) |
| Best for | Risk-averse employees, stable companies | High-growth startups, risk-tolerant employees |
| Common at | Public companies, late-stage startups | Early-stage startups |
Tax Treatment of RSUs
RSU taxation is straightforward compared to stock options, but there are nuances that affect how much you actually keep.
Federal income tax
At vesting, the fair market value of the delivered shares is treated as ordinary income and reported on your W-2. This income is subject to federal income tax at your marginal rate (up to 37% for 2024). The company withholds taxes automatically, typically at a flat supplemental rate of 22% (or 37% for amounts exceeding $1 million). If 22% withholding is less than your actual marginal rate, you'll owe additional tax when you file your return. Consider making estimated tax payments or adjusting your W-4 to avoid a large tax bill in April.
FICA taxes
RSU income is subject to Social Security tax (6.2%, up to the wage base of $168,600 in 2024) and Medicare tax (1.45%, with an additional 0.9% on income over $200,000 for single filers). If your regular salary already puts you above the Social Security wage base, you won't owe additional Social Security tax on RSU income, but Medicare tax always applies. These FICA taxes are often overlooked when employees estimate their net RSU value.
State and local taxes
RSU income is taxed by your state of residence at vesting. If you've worked in multiple states during the vesting period, some states may claim a portion of the RSU income based on the time you worked there. California, New York, and several other states have specific rules for allocating equity compensation income across states. For international employees, the tax situation is more complex: the country where you worked during each portion of the vesting period may tax that portion of the RSU income. Double taxation treaties may apply.
Post-vesting capital gains
After RSUs vest and shares are delivered, any additional appreciation above the vesting price is treated as a capital gain. If you sell within 1 year of the vesting date, it's a short-term capital gain (taxed as ordinary income). If you hold for more than 1 year after vesting and then sell, it's a long-term capital gain (taxed at 15% or 20%). Any decline below the vesting price creates a capital loss, which can offset other capital gains and up to $3,000 of ordinary income per year.
Negotiating RSUs in Job Offers
RSU grants are negotiable, especially at the offer stage. Knowing what to ask for and what the typical ranges are gives you a stronger position.
Understanding the offer
RSU offers are usually expressed as either a dollar value ("$200,000 in RSUs vesting over 4 years") or a number of shares ("2,000 RSUs"). If expressed as a dollar value, the actual number of shares is determined by dividing the value by the stock price on or near the grant date. Ask: when will the number of shares be calculated? The stock price at offer time, acceptance time, or start date? This matters because a volatile stock price can significantly change the value between those dates.
Refresh grants
Initial RSU grants vest over time, meaning the annual value of vesting RSUs decreases as you approach the end of the vesting schedule unless the company provides additional "refresh" grants. At top tech companies, annual refresh grants are standard: each year, you receive a new RSU grant that starts its own 4-year vesting schedule. This creates a rolling portfolio of overlapping grants. Ask about the company's refresh grant policy during the offer negotiation. If there's no refresh program, your equity compensation effectively drops to zero after Year 4.
Comparing RSU offers across companies
When comparing offers with different equity structures, normalize everything to a common metric: expected annual total compensation over 4 years. Include base salary, target bonus, and annualized RSU value (total grant value divided by vesting period). Apply a risk discount for equity at smaller or less stable companies. A $200,000 RSU grant at a Fortune 500 company is more reliable than a $200,000 RSU grant at a pre-IPO startup with uncertain valuation.
Financial Planning for RSU Recipients
RSUs can become a significant portion of your net worth. Managing them requires a deliberate strategy.
- Don't treat unvested RSUs as guaranteed income. Stock prices change. Companies have layoffs. Until RSUs vest, they're a promise, not a possession.
- Set a diversification target: decide in advance what percentage of your net worth you're comfortable holding in your employer's stock. Many financial advisors suggest no more than 10% to 15%. When RSUs vest, sell enough shares to maintain that target.
- Automate your sell discipline. Most brokerages allow you to set up automatic sell orders on vesting dates. This removes the emotional decision of "should I hold and hope it goes up?" and enforces a systematic approach.
- Account for tax withholding gaps. If your company withholds at the 22% supplemental rate but your marginal rate is 35%, set aside the difference immediately. Don't spend money you'll owe in taxes.
- Consider the concentration risk: your salary, your bonus, your career advancement, and your RSUs are all tied to the same company. If the company fails, you lose all of it simultaneously. Diversification isn't just about optimizing returns. It's about managing the risk of total loss.
- Plan for the "golden handcuffs" effect. Large unvested RSU balances can make you feel trapped in a job you've outgrown. Consider the opportunity cost of staying purely for vesting equity versus the career and financial growth you might achieve elsewhere.
RSUs at Private Companies (Double-Trigger RSUs)
Private companies increasingly use RSUs, but they work differently than at public companies because there's no liquid market for the shares.
How double-trigger RSUs work
At private companies, RSUs typically have a "double trigger": the first trigger is the standard time-based vesting, and the second trigger is a liquidity event (IPO, acquisition, or direct listing). Until both triggers are met, the RSUs don't convert to shares. This means an employee at a private company may have fully "vested" RSUs that can't be sold or taxed until the company goes public. The advantage: no tax liability until the shares become liquid. The disadvantage: the employee has no certainty about if or when a liquidity event will occur.
Tax implications of double-trigger RSUs
Because no shares are delivered until the liquidity event, no tax is owed until that point. When both triggers are met, the full value of the vested RSUs is recognized as ordinary income in the year of the liquidity event. This can result in a very large tax bill in a single year. Employees should plan for this by estimating the potential tax impact at various company valuations and setting aside funds or making quarterly estimated tax payments in the year the liquidity event occurs.
Secondary markets
Some private companies allow employees to sell vested shares on secondary markets (platforms like Forge, EquityZen, or Carta) before an IPO. This provides partial liquidity but comes with restrictions: the company typically must approve the sale, and there may be price limitations or blackout periods. Secondary sales are taxable events, and the price on secondary markets may be significantly different from the 409A valuation or the eventual IPO price.
RSU Program Metrics for HR Teams
These metrics help compensation teams evaluate whether RSU programs are achieving their goals of attracting, retaining, and motivating talent.
Key metrics to track
Burn rate: the number of shares granted as RSUs each year as a percentage of total shares outstanding. Overhang: total unvested and unexercised equity awards as a percentage of total shares outstanding (investors watch this closely). Retention correlation: compare voluntary turnover rates between employees with large unvested balances and those with small or no balances. Competitiveness: benchmark total compensation (including annualized RSU value) against market data from Radford, Mercer, or Levels.fyi. Equity utilization rate: what percentage of the approved equity pool has been granted, and how much remains for future hires and refreshes?
Frequently Asked Questions
Do RSUs expire?
Can I choose when to sell my vested RSUs?
What happens to RSUs during a stock split?
Are RSUs better than a higher salary?
How are RSUs handled in a divorce?
Do RSUs pay dividends?
Written by Adithyan RK