Startup Equity Explained: What Engineers Need to Know

Equity compensation can be worth millions—or nothing. Yet most engineers don't understand it well enough to evaluate offers or negotiate effectively.

Let's fix that. Here's what every engineer needs to know about startup equity.

What is Startup Equity?

Equity means you own a piece of the company. As the company becomes more valuable, so does your ownership stake. But the details matter enormously.

Types of Equity Compensation

Stock Options (ISOs and NSOs)

• The right to buy company shares at a fixed price
• Most common at early-stage startups
• You pay to exercise them (buy the shares)
• ISOs have tax advantages for employees

Restricted Stock Units (RSUs)

• Company shares given to you directly
• More common at late-stage startups and public companies
• You receive shares on a vesting schedule
• Taxed as income when they vest

Direct Stock Grants

• Rare, mostly for founders and very early employees
• You own the shares immediately (though they may vest)
• Requires paying taxes upfront

Understanding Your Equity Offer

When you get an equity offer, you need to know:

1. Number of Shares

"10,000 shares" is meaningless without context. Always ask:

• How many total shares exist? (fully diluted)
• What percentage of the company is this?

Example:

• 10,000 shares out of 10 million total = 0.1%
• 10,000 shares out of 100 million total = 0.01%

The percentage is what matters.

2. Type of Equity

Options, RSUs, or direct stock? Each has different tax implications and value.

3. Vesting Schedule

Standard is 4 years with a 1-year cliff:

• You get nothing for the first year
• After 1 year, 25% vests immediately
• Remaining 75% vests monthly over 3 years
• If you leave before the cliff, you get nothing

Some companies offer faster vesting or no cliff—this is more employee-friendly.

4. Exercise Price (for options)

The price you pay to buy your shares. Lower is better.

Also called the "strike price" or "grant price."

5. Current Valuation

What's the company worth today? This determines your equity's current paper value.

Formula:

Your percentage × Company valuation = Paper value

Example:

0.1% × $100M valuation = $100,000

6. Expiration Terms

Most stock options expire 90 days after you leave. This means:

• You must buy your shares within 90 days, or
• You lose them entirely

Some companies offer 10-year exercise windows—much better for employees.

Evaluating Equity Value

Your equity is only valuable if the company succeeds. Here's how to think about it:

Early-Stage Startups (Seed to Series A)

High risk, high potential reward

• Most fail (90% of startups fail)
• Winners can be worth a lot
• Your equity might be worth $0 or millions

What to look for:

• Strong team with relevant experience
• Real product traction (revenue, users)
• Reasonable burn rate and runway
• Credible investors

Typical equity: 0.1% - 1.0% for senior engineers

Growth Stage (Series B-C)

Medium risk, medium reward

• Company has proven product-market fit
• Valuation is higher (equity is "more expensive")
• More likely to have a liquidity event

What to look for:

• Growing revenue and user base
• Clear path to profitability or exit
• Strong leadership team
• Competitive moat

Typical equity: 0.05% - 0.5% for senior engineers

Late Stage (Series D+)

Lower risk, lower reward

• Company is more mature and stable
• Equity is valued closer to public market
• Often includes RSUs instead of options

What to look for:

• IPO timeline (1-2 years)
• Strong financials
• Market leadership position
• Experienced public company leadership

Typical equity: 0.01% - 0.2% for senior engineers

Tax Implications

Equity compensation has complex tax implications:

Stock Options (ISOs)

At grant: No taxes

At exercise: Potential Alternative Minimum Tax (AMT)

At sale: Capital gains tax (long-term if held 1+ year after exercise and 2+ years after grant)

Stock Options (NSOs)

At grant: No taxes

At exercise: Ordinary income tax on the difference between exercise price and fair market value

At sale: Capital gains tax on gains since exercise

RSUs

At grant: No taxes

At vest: Ordinary income tax on full value

At sale: Capital gains tax on gains since vesting

Important: Talk to a tax professional. Equity taxes can be complicated and costly if mishandled.

Red Flags in Equity Offers

Be cautious if:

• Company won't share total share count or valuation
• Vesting is longer than 4 years or has unusual terms
• Options expire in 90 days after departure
• Strike price equals or exceeds last funding valuation
• Company has been raising money for years without progress
• High employee turnover (check Glassdoor and Blind)

Negotiating Equity

Yes, you can negotiate! Here's how:

1. Know the Ranges

Research typical equity ranges for your role and stage:

• Ask recruiters and peers
• Check levels.fyi for comparable offers
• Understand what's reasonable for the company stage

2. Negotiate the Percentage

Focus on ownership percentage, not share count. Share counts change with funding rounds, but your percentage is what matters.

3. Consider the Whole Package

Don't optimize for just equity or just salary. Consider:

• Total compensation (salary + equity value)
• Cash needs vs. long-term upside
• Risk tolerance and personal situation
• Alternative offers

4. Ask About Refresh Grants

Many companies provide additional equity grants after you join. Ask about:

• How often?
• Based on what criteria?
• Typical amounts?

Common Mistakes Engineers Make

Mistake 1: Ignoring Equity

"I only care about salary" means leaving potentially life-changing money on the table.

Mistake 2: Overvaluing Early-Stage Equity

Don't treat equity at a seed startup like cash. It's a lottery ticket.

Mistake 3: Not Exercising Options

If you leave and don't exercise, you lose your equity. Consider:

• Exercise costs
• Tax implications
• Company prospects

Mistake 4: Joining Without Due Diligence

Research the company thoroughly:

• Talk to current and former employees
• Review financials if possible
• Understand the exit timeline
• Know who the investors are

Example Scenarios

Scenario 1: Early-Stage Offer

Offer: $150K salary + 0.5% equity

Company: Series A, $20M valuation

Analysis:

• Equity paper value: 0.5% × $20M = $100K
• Real value: Likely $0 (90% fail) or $500K-$2M if successful
• Total comp today: $150K (don't count the equity yet)

Decision: If you believe in the mission and team, and can afford the salary, this could be worth it.

Scenario 2: Late-Stage Offer

Offer: $180K salary + $100K RSUs/year

Company: Series D, planning IPO in 12-18 months

Analysis:

• RSUs have more certain value
• Likely to vest and be sellable
• Total comp: $280K (much more certain)

Decision: Lower risk, but also lower potential upside than early-stage.

Questions to Ask About Equity

Before accepting any offer:

1. What percentage of the company does this represent?
2. What's the total fully diluted share count?
3. What's the current 409A valuation?
4. What's the vesting schedule and cliff?
5. For options: What's the exercise price?
6. How long do I have to exercise after leaving?
7. What was the last fundraise valuation?
8. What's the planned exit timeline?
9. Are there any liquidation preferences I should know about?
10. Can you provide an example exit scenario showing my payout?

Final Thoughts

Equity compensation is complex, but understanding it is crucial for your financial future. Don't be shy about asking questions—good companies want employees to understand their compensation.

Remember:

• Equity is a bet on the company's success
• Don't count equity as money until it's liquid
• Negotiate thoughtfully and understand the trade-offs
• Get professional tax advice when exercising or selling

Need help evaluating a startup equity offer? Forecareer can connect you with companies offering competitive equity packages and help you understand what's market rate for your level.