Stock options or RSUs? It's one of the most common questions startup employees face. This guide breaks down the differences—tax treatment, risk, upside potential, and when each type makes sense—so you can make an informed decision.
The Quick Answer
Choose Stock Options if: You're at an early-stage startup, believe in high growth, can afford the exercise cost, and want maximum upside potential.
Choose RSUs if: The company is later-stage (Series C+), you're risk-averse, can't afford exercise costs, or prefer predictable vesting value.
The Tradeoff in One Sentence
Stock options = Higher upside, more risk, requires cash to exercise. RSUs = Lower risk, guaranteed value at vesting, less upside.
What Are Stock Options?
Stock options give you the right to buy shares at a fixed price (the strike price). You profit when the company's value rises above your strike price.
Stock Options Example
Your grant: 10,000 options at $2 strike price
Current FMV: $10/share
Exercise cost: $20,000 (10,000 × $2)
Paper gain: $80,000 (10,000 × $8 spread)
Net if you exercise: You own $100,000 of stock for $20,000
Key Characteristics of Stock Options
- Strike price: Fixed price you pay to exercise
- Time-based: Options expire after 10 years (or 90 days after leaving for ISOs)
- Exercise required: Must pay strike price to own shares
- Tax complexity: ISOs (AMT risk, capital gains) vs NSOs (ordinary income)
- Leverage: amplify gains—if the stock doubles, your gain doubles the spread
What Are RSUs?
Restricted Stock Units (RSUs) are actual shares that vest over time. No exercise required—you own the shares when they vest.
RSUs Example
Your grant: 10,000 RSUs
Current FMV: $10/share
Exercise cost: $0 (no strike price)
Taxable value at vesting: $100,000 (10,000 × $10)
Net when vested: You own $100,000 of stock (minus taxes)
Key Characteristics of RSUs
- No strike price: Shares are granted directly—nothing to pay
- Vesting required: Shares become yours as they vest (typically 4 years)
- Tax at vesting: Full value is taxed as ordinary income when shares vest
- Simple tax treatment: Ordinary income at vesting, capital gains on future appreciation
- Lower leverage: No strike price to amplify gains
Side-by-Side Comparison
| Factor | Stock Options | RSUs |
|---|---|---|
| What you receive | Right to buy shares at strike price | Actual shares that vest over time |
| Exercise cost | Yes—must pay strike price to own shares | No—shares vest directly to you |
| Risk | Higher—if FMV ≤ strike, options worthless | Lower—vested shares have value if FMV > 0 |
| Upside potential | Higher—leverage on growth above strike | Lower—no strike price leverage |
| Tax timing | At exercise (NSO) or sale (ISO with holding period) | At vesting—full value is ordinary income |
| Tax rate | Ordinary income (NSO) or capital gains (ISO with holding) | Ordinary income at vesting, capital gains after |
| Complexity | Higher—ISO vs NSO, AMT considerations | Lower—straightforward vesting tax |
| Expiration | Yes—10 years post-grant or 90 days post-departure (ISO) | No—vested shares don't expire |
When Stock Options Are Better
Scenario 1: Early-Stage Startup, High Growth Potential
You're joining a seed or Series A startup. The strike price is low (close to FMV), and you believe the company will grow significantly.
Why Options Win Here
Strike price: $0.50/share
Expected exit value: $20/share
Your gain per share: $19.50
Gain on 10,000 options: $195,000
With RSUs at the same company, you'd get fewer shares (no strike price leverage), so your upside would be lower.
Scenario 2: You Can Afford the Exercise Cost
You have cash available to exercise, and you're comfortable risking it on the startup's success.
Why Options Win Here
If you can afford the $20,000 exercise cost, you control $100,000 of stock. That's 5x leverage on your cash. RSUs offer no leverage—you simply get what you're granted.
Scenario 3: You Want to Optimize for Long-Term Capital Gains
You have ISOs and can meet the holding requirements (1 year post-exercise, 2 years post-grant).
Tax Advantage of ISOs
ISO gain (long-term capital gains): 15-20% tax rate
RSU gain (ordinary income): 24-37% tax rate
Savings on $100,000 gain: Up to $22,000 less tax
⚠️ AMT Risk for ISOs
ISOs can trigger Alternative Minimum Tax (AMT) at exercise if the spread is large. This creates a tax bill even before you sell shares. Calculate AMT impact before exercising ISOs.
Scenario 4: You're Joining as an Early Employee
Early hires (first 10-20 employees) typically get larger option grants than RSU grants at similar companies. The equity percentage is higher with options.
Early Hire Equity Comparison
Early hire (options): 1.0% equity as options
Early hire (RSUs): 0.5% equity as RSUs (typical)
When RSUs Are Better
Scenario 1: Later-Stage Startup (Series C+)
The company is already valued at $500M+ and likely heading toward IPO. Strike prices are high, reducing option leverage.
Why RSUs Win Here
Strike price: $20/share
Expected exit value: $30/share
Your gain per share: $10
Gain on 10,000 options: $100,000 (minus $20,000 exercise cost)
With RSUs, you get the full $30/share value at vesting (taxed as income). No exercise cost, simpler process.
Scenario 2: You're Risk-Averse or Can't Afford Exercise Cost
You don't have cash to spare, or you're uncomfortable risking money on the startup's success.
Why RSUs Win Here
RSUs vest directly to you—no cash outlay. If the company grows, your RSUs grow in value. If it fails, you lost nothing but opportunity cost. Options require cash to exercise, which you might lose entirely.
Scenario 3: You Want Simplicity
You don't want to deal with exercise timing, ISO vs NSO decisions, AMT calculations, or holding periods.
Why RSUs Win Here
RSUs vest → Taxed as income → You own shares. Simple. No decisions about when to exercise, no AMT risk, no holding period requirements. Vest and sell (or hold) as you choose.
Scenario 4: You're Near IPO and Want Liquidity
The company is going public soon, and you want to participate in the IPO.
Why RSUs Win Here
RSUs are common in late-stage pre-IPO companies. They vest predictably, and you can sell shares immediately after the IPO (subject to lock-up). Options require pre-IPO exercise, which means paying cash before you can sell.
Tax Implications: The Critical Difference
Stock Options Tax (ISOs)
- No tax at grant: No tax when options are granted
- AMT possible at exercise: If spread > $100K, AMT may apply
- Capital gains at sale: If you hold 1+ year post-exercise and 2+ years post-grant
- Ordinary income if holding period not met: Disqualifying disposition
- Cap: $100K ISO value exercisable per year
Stock Options Tax (NSOs)
- No tax at grant: No tax when options are granted
- Ordinary income at exercise: Spread (FMV - strike) is taxed as ordinary income
- Payroll tax possible: Social Security and Medicare may apply
- Capital gains after exercise: Any appreciation after exercise is capital gains if held 1+ year
RSUs Tax
- No tax at grant: No tax when RSUs are granted
- Ordinary income at vesting: Full FMV is taxed as ordinary income when shares vest
- Payroll tax: Social Security and Medicare apply at vesting
- Capital gains after vesting: Any appreciation after vesting is capital gains if held 1+ year
⚠️ Tax Withholding for RSUs
Companies typically sell some of your vested RSUs to cover tax withholding. You'll receive fewer shares than expected—the rest covers your tax bill. Ask about your company's withholding policy.
How to Choose: Decision Framework
Ask yourself these questions to decide between options and RSUs:
Decision Checklist
- What stage is the company? Early-stage → Options. Late-stage → RSUs.
- Can I afford the exercise cost? Yes → Options. No → RSUs.
- What's my risk tolerance? High → Options. Low → RSUs.
- Do I want maximum upside or predictable value? Upside → Options. Predictable → RSUs.
- Am I comfortable with tax complexity? Yes → Options (ISOs). No → RSUs.
- When do I expect liquidity? Near-term → RSUs. Long-term → Either.
The Best of Both Worlds: Mixed Grants
Some startups offer both options and RSUs. This gives you:
- Upside from options: Maximum leverage on company growth
- Safety from RSUs: Guaranteed value at vesting
- Tax diversification: Mix of ordinary income and capital gains
Mixed Grant Example
Your offer: 5,000 options + 5,000 RSUs
Options upside: Leverage on growth above strike
RSUs floor: Predictable value at vesting
Result: Balanced risk and upside
Key Takeaways
- Stock options = higher upside, more risk — Must exercise, potential for worthless if company fails
- RSUs = lower risk, predictable value — Vest directly to you, no exercise cost
- Taxes differ significantly — RSUs: ordinary income at vesting. ISOs: capital gains (if held) but AMT risk. NSOs: ordinary income at exercise
- Early-stage favors options — Low strike price + high growth potential = maximum leverage
- Late-stage favors RSUs — High strike price + lower growth potential = RSUs simpler and lower risk
- Mixed grants offer balance — Some companies offer both options and RSUs for risk/upside balance
📊 Calculate Your Stock Options Value
If your offer includes stock options, see what they're worth today and at 4 exit scenarios. Get vesting timeline, benchmark verdict, and PDF report.
Calculate Options Value (Free) →Related Tools & Guides
- Stock Option Tax Calculator — Estimate ISO, NSO, and RSU taxes
- Should I Exercise My Stock Options? — Decision framework for exercising
- How to Exercise Without Cash — Strategies when funds are tight
- Stock Option Exercise Strategies — Compare approaches
- Equity Benchmarks by Role — Market data for your offer
Frequently Asked Questions
Can I have both stock options and RSUs in the same offer?
Yes, many startups offer both. This is common for senior hires or when transitioning from early to late stage. A mixed grant gives you upside potential (options) and predictable value (RSUs). Get the specific split and vesting schedules in writing.
Are RSUs better than stock options for taxes?
RSUs have simpler tax treatment but higher immediate tax bills. The full value is taxed as ordinary income when shares vest. ISOs can have lower long-term tax rates (capital gains) if you meet holding requirements, but AMT complexity increases risk. NSOs are taxed like RSUs (ordinary income) but at exercise rather than vesting.
Do RSUs vest like stock options?
Yes, RSUs typically vest on the same schedule as stock options (4-year vesting with 1-year cliff). The key difference: vested RSUs are shares you own immediately. Vested options are the right to buy shares—you must still exercise and pay the strike price.
What happens to RSUs if I leave my job?
Unvested RSUs typically stop vesting when you leave—just like unvested options. You forfeit any unvested RSUs. Vested RSUs are yours to keep (and sell, if there's liquidity) regardless of when you leave.
Should I choose ISOs or NSOs over RSUs?
Choose ISOs over RSUs if you believe in the company's long-term growth, can afford exercise costs, and want to optimize for capital gains treatment (with AMT risk). Choose NSOs over RSUs if you want to defer tax to exercise rather than vesting, but the overall tax burden is similar. Choose RSUs if you want simplicity, can't afford exercise costs, or are risk-averse.