Equity compensation can be the difference between retiring comfortably and just paying bills. But most engineers don't understand what they're signing. After reviewing thousands of offer letters and helping engineers evaluate equity packages, I've compiled everything you need to make informed decisions.
Equity Types: Quick Comparison
| Type | Best For | Tax Timing | Risk Level | Liquidity |
|---|---|---|---|---|
| RSUs | Public companies, risk-averse | At vesting | Low | High (public) |
| ISOs | Early employees, long hold | At sale | Medium | Low until exit |
| NSOs | Contractors, late-stage | At exercise | Medium | Low until exit |
| Phantom Stock | Private companies, simplicity | At payout | Low | Tied to event |
| ESPP | Public company employees | At sale | Low | High |
RSUs (Restricted Stock Units)
How RSUs Work
RSUs are promises to give you company shares after vesting conditions are met. You receive actual shares on the vesting date—no purchase required.
Typical Vesting Schedule:
- 4-year vest with 1-year cliff
- 25% vests at 12 months, then monthly/quarterly thereafter
- Some companies use backloaded schedules (Amazon: 5/15/40/40%)
RSU Tax Treatment
| Event | What Happens | Tax Owed |
|---|---|---|
| Grant date | Receive RSU agreement | None |
| Vesting date | Shares delivered to you | Ordinary income on full value |
| Sale | You sell shares | Capital gains on appreciation since vest |
Example:
- Granted 1,000 RSUs at $100/share value
- At vesting, stock price is $150
- Taxable income: $150,000 (ordinary income rates)
- If you sell later at $200: $50,000 capital gain
RSU Withholding Methods
| Method | How It Works | Pros | Cons |
|---|---|---|---|
| Sell-to-cover | Company sells shares to cover taxes | No cash outlay | Reduces share count |
| Net settlement | Company withholds shares | No cash outlay | Reduces share count |
| Cash transfer | You pay taxes in cash | Keep all shares | Need liquid cash |
Pro Tip: At higher tax brackets, default withholding (22% federal) is often insufficient. Set aside additional cash or increase withholding to avoid April surprises.
Stock Options: ISOs vs NSOs
ISO (Incentive Stock Options)
ISOs are tax-advantaged options available only to employees.
Tax Treatment:
| Event | ISO Tax Impact |
|---|---|
| Grant | None |
| Exercise (hold shares) | None for regular tax; AMT on spread |
| Sale (after holding period*) | Long-term capital gains on full gain |
| Sale (before holding period) | Ordinary income on spread at exercise |
*Holding period: 2 years from grant AND 1 year from exercise
AMT Warning: The spread at exercise (market price - strike price) is an AMT preference item. Large exercises can trigger significant AMT liability even without selling shares.
Example:
- Strike price: $1
- Exercise price: $10
- You exercise 10,000 shares
- AMT preference item: $90,000
- If AMT pushes you over threshold: ~$25,000 additional tax owed
NSO (Non-Qualified Stock Options)
NSOs are simpler but less tax-advantaged:
| Event | NSO Tax Impact |
|---|---|
| Grant | None |
| Exercise | Ordinary income on spread |
| Sale | Capital gains on post-exercise appreciation |
NSO vs ISO Decision Framework:
| Factor | Favors ISO | Favors NSO |
|---|---|---|
| Expected holding period | >1 year post-exercise | <1 year |
| Current income level | Lower bracket | Higher bracket |
| AMT exposure | Low existing AMT | Already paying AMT |
| Liquidity needs | Can afford to wait | Need cash sooner |
Phantom Stock / Stock Appreciation Rights (SARs)
How Phantom Stock Works
Phantom stock provides the economic benefit of ownership without actual shares. You receive cash payments tied to stock value, typically at exit events.
Structure:
| Component | Description |
|---|---|
| Grant | Units assigned, tracking stock price |
| Vesting | Same as options/RSUs (typically 4 years) |
| Payout | Cash equal to unit value at trigger event |
| Triggers | Acquisition, IPO, or set date |
Tax Treatment
| Event | Tax Impact |
|---|---|
| Grant | None |
| Vesting | None (unlike RSUs) |
| Payout | Ordinary income on full amount |
Pros:
- No purchase required
- No AMT concerns
- Simple administration
Cons:
- Taxed as ordinary income (no capital gains)
- Usually only liquid at exit
- No actual ownership rights
ESPP (Employee Stock Purchase Plans)
How ESPPs Work
ESPPs allow employees to purchase company stock at a discount through payroll deductions.
Standard Terms:
- 15% discount from lower of start or end price
- 6-month purchase periods
- Max contribution: $25,000/year (at grant value)
ESPP Math Example
| Factor | Value |
|---|---|
| Offering period start price | $100 |
| Purchase date price | $120 |
| Purchase price (15% off lower) | $85 |
| Immediate gain if sold | $35/share (41% return) |
Strategy: For maximum return, contribute the maximum allowed, then sell immediately after purchase. The 15% guaranteed discount provides immediate return with minimal risk.
Valuation Frameworks
Startup Equity Valuation
For private companies, use this framework:
| Factor | Question to Ask | Impact |
|---|---|---|
| Preferred stock price | What's the 409A valuation? | Sets baseline value |
| Dilution | What's the fully-diluted share count? | Determines % ownership |
| Exit scenarios | Realistic exit range? | Determines upside |
| Liquidation preference | How much preferred gets first? | Can wipe out common |
| Time to liquidity | When could this be liquid? | Discount for illiquidity |
Simplified Valuation:
Expected Value = (Shares × Exit Price × Your %) - Exercise Cost / Probability of Exit
Example:
- 10,000 options, strike $1
- Company valued at $100M, 10M shares outstanding
- Your ownership: 0.1%
- Estimated exit: $500M (50% probability), $0 (50% probability)
- Expected value: (0.1% × $500M × 50%) - $10,000 = $240,000
Public Company RSU Valuation
| Component | Calculation |
|---|---|
| Gross value | Shares × Current price |
| Tax-adjusted value | Gross × (1 - marginal tax rate) |
| Present value | Tax-adjusted ÷ (1 + discount rate)^years |
Example:
- 1,000 RSUs at $150/share
- 4-year vest, 35% marginal rate
- 5% discount rate
- Present value: ~$88,000 (vs. $150,000 gross)
Equity Negotiation Benchmarks
Startup Equity by Stage
| Stage | Engineer Level | Typical Equity Range |
|---|---|---|
| Pre-seed | Founding engineer | 1-5% |
| Seed | First 5 engineers | 0.25-1% |
| Series A | Senior engineer | 0.1-0.5% |
| Series B | Senior engineer | 0.05-0.25% |
| Series C+ | Senior engineer | 0.01-0.1% |
Public Company RSU Benchmarks (2026)
| Level | Annual RSU Value (Big Tech) | Annual RSU Value (Mid-tier) |
|---|---|---|
| L3/E3 (Junior) | $30,000-60,000 | $15,000-30,000 |
| L4/E4 (Mid) | $60,000-120,000 | $30,000-60,000 |
| L5/E5 (Senior) | $120,000-250,000 | $50,000-120,000 |
| L6/E6 (Staff) | $250,000-500,000 | $100,000-200,000 |
| L7+ (Principal+) | $500,000+ | $200,000+ |
Red Flags in Equity Offers
| Red Flag | What It Means | Action |
|---|---|---|
| No 409A valuation | Early stage or disorganized | Ask for recent valuation |
| Single-trigger acceleration only | Less protection | Negotiate double-trigger |
| 10-year expiration on ISOs | Standard | Acceptable |
| 90-day post-termination exercise | Short window | Negotiate extension |
| No early exercise | Can't start capital gains clock | Consider requesting |
| Liquidation preference >1x | VCs get paid first, multiple times | Understand waterfall |
| Full ratchet anti-dilution | Future rounds could hurt you | Understand dilution risk |
Tax Planning Strategies
83(b) Election
For early-exercised options or restricted stock:
| Without 83(b) | With 83(b) |
|---|---|
| Taxed on spread at vest | Taxed on spread at grant |
| Ordinary income rates | Start capital gains clock early |
| No risk if stock drops | Pay tax even if stock goes to $0 |
When to use 83(b):
- Very early stage (low current value)
- High confidence in company
- Can afford tax payment now
Deadline: Must file within 30 days of exercise. No exceptions.
Qualified Small Business Stock (QSBS)
If stock qualifies:
- Exclude up to $10M or 10x basis from capital gains
- Requires 5+ year hold
- Company must be C-corp under $50M assets at issuance
References
- IRS. "Publication 525: Taxable and Nontaxable Income." IRS.gov, 2025.
- Cooley GO. "Startup Company Lawyer Resources." Cooley.com.
- Index Ventures. "The Option Plan Guide for European Startups." 2024.
- NCEO. "Equity Compensation Overview." National Center for Employee Ownership.
Need help evaluating an equity offer? Contact SmithSpektrum for confidential offer analysis and negotiation support.