Stock Options vs RSUs: Understanding Your Equity Compensation

Stock Options vs RSUs at a Glance

Both stock options and RSUs are forms of equity compensation that give employees ownership in their company. But they work very differently in practice. Understanding these differences is critical because they affect when you pay taxes, how much risk you take on, and how much your equity is actually worth.

In simple terms: stock options are a bet that the stock will go up, while RSUs are guaranteed compensation as long as the stock has any value. This fundamental difference shapes everything about how you should think about each type. Calculate the impact of either type on your total compensation using our Salary Calculator.

How Stock Options Work

A stock option gives you the right to purchase company shares at a fixed price, called the strike price or exercise price. This price is set on your grant date and stays the same regardless of what happens to the stock price afterward. If the stock rises above your strike price, you can buy shares at a discount. If the stock falls below your strike price, your options are "underwater" and have no intrinsic value.

ISOs vs NSOs

There are two types of stock options, and the tax treatment differs dramatically:

Incentive Stock Options (ISOs) are available only to employees and receive favorable tax treatment. When you exercise ISOs, you do not owe regular income tax on the spread (the difference between strike price and market price). Instead, you may owe Alternative Minimum Tax (AMT). If you hold the shares for at least 1 year after exercise and 2 years after grant, any gain is taxed at the long-term capital gains rate (0%, 15%, or 20%), which is significantly lower than ordinary income tax rates.

Non-Qualified Stock Options (NSOs) can be granted to employees, contractors, and advisors. At exercise, the spread is taxed as ordinary income and reported on your W-2. This means you owe income tax plus payroll tax on the spread immediately. Any additional gain after exercise is taxed as capital gains (short-term if held under 1 year, long-term if over 1 year).

Example: Options in Action

The key advantage of ISOs is clear: you pay capital gains rates instead of ordinary income rates, potentially saving $30,000-$50,000 on a $200,000 gain. But you need $50,000 cash to exercise, and you risk the stock dropping after you buy. For a full breakdown of option types, see our companion article on stock options explained. Use LevyIO's capital gains calculator to estimate your tax liability.

How RSUs Work

RSUs (Restricted Stock Units) are simpler than options. Your company promises to give you a certain number of shares on future dates according to a vesting schedule. When shares vest, they are yours. No purchase required. No strike price to worry about.

The most common vesting schedule is 4 years with a 1-year cliff. This means nothing vests in year one, then 25% vests on your first anniversary, and the remaining 75% vests monthly or quarterly over the next 3 years. Some companies, like Amazon, use back-loaded schedules (5%, 15%, 40%, 40%) that vest more heavily in later years to encourage retention.

RSU Taxation

RSUs are taxed as ordinary income when they vest. The full market value of the shares on the vesting date is added to your W-2 income and subject to federal income tax, state income tax, Social Security, and Medicare. Your company typically withholds shares to cover the tax bill, so you receive fewer shares than the number that vested.

Example: RSUs in Action

RSUs are lower risk than options because they always have value as long as the stock is worth anything. Even if the stock drops 50% after your grant, your RSUs still deliver real money. However, you have less upside potential compared to options at a fast-growing startup. Understand the tax impact on your paycheck with our Paycheck Calculator.

When to Choose Options Over RSUs

You generally do not get to choose. Companies decide which type of equity to offer. But when evaluating job offers, understanding the tradeoffs helps you value each package correctly.

Options are better when: You are joining an early-stage startup with high growth potential. If the company goes from a $10M valuation to $1B, your options could be worth 100x their grant value. RSUs at the same company would only be worth 100x if the stock moved the same amount, but the key difference is that options cost you less upfront to acquire that exposure.

RSUs are better when: You are at a large public company with stable or moderate growth. RSUs at Google, Microsoft, or Amazon deliver predictable value regardless of stock price direction. They act like a cash bonus that happens to be paid in stock. There is no exercise cost, no risk of losing money you invested, and no complex tax elections to worry about.

When comparing job offers that include equity, our Job Offer Comparison tool helps you evaluate the full package including base salary, bonus, and equity value.

Tax Strategies for Equity Compensation

The right tax strategy can save you tens of thousands of dollars. Here are the most important tactics for each equity type:

For ISOs

• Exercise early when the spread is small. If you join a startup and your strike price is $1 with a current 409A valuation of $1.50, exercising immediately costs $10,000 for 10,000 shares with only $5,000 in AMT exposure. If you wait until the stock is worth $50, the AMT exposure on the same shares is $490,000.
• File an 83(b) election within 30 days of early exercise. This starts the capital gains clock immediately and can eliminate AMT entirely if you exercise at or near the strike price.
• Hold for qualifying disposition. Keep shares at least 1 year after exercise and 2 years after grant to get long-term capital gains treatment. At a 15% capital gains rate versus 35% ordinary income rate, the savings on a $200,000 gain is $40,000.
• Watch the AMT crossover point. Calculate how many ISOs you can exercise per year without triggering AMT. Spreading exercises over multiple tax years can keep you below the AMT threshold.

For RSUs

• Sell immediately and diversify. Most financial advisors recommend selling RSUs as soon as they vest and investing the proceeds in a diversified portfolio. Holding company stock concentrates your risk: your job and your investment portfolio are tied to the same company.
• Check supplemental withholding. Most companies withhold at a flat 22% for supplemental income, which may be lower than your actual tax bracket. If you are in the 32% or 37% bracket, you may owe additional tax at filing time. Set aside the difference to avoid a surprise bill.
• Consider tax-loss harvesting. If you hold RSU shares and the price drops below your vesting price, selling at a loss generates a tax deduction you can use to offset other gains. Be aware of wash sale rules if you plan to repurchase.
• Max out your 401(k) in vesting years. Large RSU vests push you into higher tax brackets. Maximizing pre-tax 401(k) contributions ($24,500 in 2026) reduces your taxable income and partially offsets the RSU income bump. Learn more in our 401(k) contribution guide.

Understanding how equity interacts with your overall tax picture is essential. Our Net Pay Calculator helps model the impact, and LevyIO's tax calculator provides detailed federal and state breakdowns.

Valuing Equity in a Job Offer

When comparing offers, you need a realistic way to value equity. Here is a practical framework:

For Public Company RSUs

Public company RSUs are the easiest to value because the stock has a market price. Take the number of RSUs, multiply by the current stock price, and divide by the vesting period. Example: 4,000 RSUs at $150/share vesting over 4 years = $600,000 / 4 = $150,000/year in equity compensation. Discount this by 10-15% to account for stock price volatility and tax withholding, giving you a conservative annual value of $127,500-$135,000.

For Startup Options

Startup options are harder to value because the stock is not publicly traded. A conservative approach: take the number of options, multiply by the difference between the current 409A valuation and your strike price, divide by the vesting period, then apply a discount factor. Most startups fail, so applying a 70-90% discount to the theoretical value gives you a more realistic number. If 50,000 options have a theoretical annual value of $100,000, a 75% discount values them at $25,000/year for comparison purposes.

Never accept a below-market base salary in exchange for equity at a startup unless you genuinely believe in the company and can afford to lose the equity entirely. Your base salary pays the bills. Equity is upside. Compare full packages with our Job Offer Comparison tool and see your total compensation breakdown.

Common Mistakes to Avoid

• Letting options expire. Most companies give you 90 days to exercise after leaving. If you have valuable vested options and leave the company, mark this deadline and make a decision before it passes. Extended exercise windows (up to 10 years) are becoming more common at startups but are not universal.
• Concentrating too much in company stock. The Enron and Lehman Brothers employees who held most of their wealth in company stock lost everything. A common rule: do not hold more than 10-15% of your net worth in any single stock, including your employer.
• Ignoring AMT on ISO exercises. Exercising a large block of ISOs can trigger a six-figure AMT bill even though you received no cash. Model the AMT impact before exercising.
• Not understanding your vesting schedule. If you are considering leaving a job, check your vesting dates. Waiting an extra month could mean an additional $20,000-$50,000 in vested equity, often called "golden handcuffs."
• Treating unvested equity as guaranteed. Unvested RSUs and options are a promise, not a guarantee. If you are laid off, unvested equity typically disappears. Factor only vested equity into your net worth calculations.

Frequently Asked Questions