The offer looks strong. Base salary is fair, the team is smart, and the company has traction. Then you get to the equity section: 0.15% of the company, 4-year vest, 1-year cliff. You nod, unsure whether that's excellent or insulting, and move on.
This happens constantly. Equity is the most negotiable — and most misunderstood — part of any startup offer. Engineers and product managers who spend hours researching base salary benchmarks accept equity packages they can't evaluate because the math feels opaque. It isn't.
This guide gives you the framework to calculate what your equity is actually worth, ask the questions that matter, and negotiate with confidence.
Step 1: Understand What You're Actually Being Offered
Most startup offers grant stock options, not stock. An option is the right to purchase shares at a fixed price — the strike price, also called the exercise price — at some point in the future. You don't own anything when you receive options. You own something only after you vest and choose to buy.
There are two common types:
- Incentive Stock Options (ISOs) — the standard for US employees. ISOs have favorable tax treatment: if you hold the shares long enough after exercising, gains are taxed at long-term capital gains rates rather than ordinary income. The catch is the Alternative Minimum Tax (AMT) — exercising a large ISO grant can trigger AMT liability even if the shares aren't worth anything yet. Consult a tax professional before exercising a large ISO grant.
- Non-Qualified Stock Options (NSOs or NQSOs) — common for contractors, advisors, and some employees. The spread between your strike price and the fair market value at exercise is taxed as ordinary income immediately. Less favorable than ISOs but simpler.
RSUs (Restricted Stock Units) are less common at early-stage startups and more common at late-stage or pre-IPO companies. Unlike options, RSUs are actual shares that vest over time — you don't pay to acquire them, but they're taxed as ordinary income when they vest.
For most startup offers, you're dealing with ISOs. The rest of this guide assumes that.
Step 2: Calculate Your Actual Ownership Percentage
The number in your offer letter — "50,000 shares" — is meaningless without context. What matters is the percentage of the company those shares represent. To calculate it, you need one number the company often doesn't volunteer: total shares outstanding (also called fully diluted share count).
The formula is simple:
Your ownership % = your shares ÷ total fully diluted shares
If you're offered 50,000 shares and the company has 10,000,000 fully diluted shares outstanding, you own 0.5%. If they have 100,000,000 shares outstanding, you own 0.05%. The number of shares is arbitrary — the percentage is what you're actually negotiating.
Ask for the fully diluted share count. Any company that refuses to share it is a yellow flag. Most will provide it when asked directly.
What "fully diluted" means
Fully diluted includes all shares that could exist: issued common stock, all outstanding options (even unvested), the entire option pool, and any convertible notes or SAFEs that will convert into equity at the next round. This is the denominator you want — it reflects the real denominator at exit.
Step 3: Understand the Vesting Schedule and What It Actually Means
The standard schedule — 4 years with a 1-year cliff — means you vest 25% of your grant after 12 months, then the remaining 75% vests monthly over the following 36 months. If you leave before the 1-year mark, you get nothing.
Things to verify in the offer:
- Acceleration on acquisition: Does your vesting accelerate if the company is acquired? "Single trigger" means your unvested shares vest immediately on a change of control. "Double trigger" means acceleration only happens if there's both an acquisition and you're terminated or demoted within a set period. Double trigger is standard; single trigger is a nice-to-have but rare.
- Early exercise: Some companies allow you to exercise unvested options immediately (Section 83(b) election). This can be tax-advantageous — you start the long-term capital gains clock earlier and potentially reduce AMT exposure — but it requires paying cash upfront and taking on real risk.
- Cliff timing for subsequent grants: If you receive a refresh grant 18 months in, does it have its own 1-year cliff? Most do. Understand the vesting schedule on any future refresh grants the company describes during the offer process.
Step 4: Know the Exercise Window — This One Can Cost You Dearly
When you leave a company — voluntarily or not — you typically have 90 days to exercise your vested options. After 90 days, they expire. Gone.
This is the trap most employees don't see until it's too late. If you've been at a startup for three years, you've vested 75% of your grant. You leave for another opportunity. You now have 90 days to pay cash (strike price × number of shares) to exercise your vested options. If you can't or don't, you lose them.
At early-stage companies, the strike price might be low enough that exercising is affordable. At a growth-stage company post-Series C, the 409A valuation may have risen substantially, making exercise expensive — and ISO exercise can trigger AMT even if you can't sell the shares yet.
A growing number of companies have extended their exercise windows to 5 or 10 years post-termination. When evaluating an offer, ask: what is the post-termination exercise window? A 5–10 year window is employee-friendly and indicates the company has thought carefully about equity design.
Step 5: Understand the Preference Stack
Here's the piece that sophisticated candidates ask about and most don't: liquidation preferences.
When a startup raises money, investors typically receive preferred stock with a liquidation preference — the right to be paid back first (usually 1× their investment) before common stockholders (you) receive anything. In a strong exit, this doesn't matter. In a modest exit, it can mean employees receive nothing.
Example: A company raises $50M total across several rounds. It sells for $60M. Investors with 1× non-participating preferences get their $50M back first, leaving $10M for common stockholders. If common represents 40% of fully diluted shares, common holders split $10M — not $60M. Your 0.5% stake is worth $50,000, not $300,000.
Ask: What is the total capital raised, and do investors have participating preferred or non-participating preferred? Participating preferred is more dilutive to employees — investors get their preference back and participate in the upside alongside common. Non-participating preferred is more standard and employee-friendly.
Step 6: Value Your Options Realistically
To estimate what your options might be worth, you need two numbers:
- The current 409A valuation (the IRS-required independent appraisal of common stock fair market value — this is your strike price)
- The last round valuation (what investors paid per preferred share, which implies a per-share value for preferred)
The gap between the 409A (common) and the last round price (preferred) reflects the liquidity premium and preference stack discount applied to common. Common stock is typically valued at 25–40% of preferred in early-stage companies for this reason.
A simple scenario analysis:
| Exit valuation | Your ownership | Gross value (pre-preference) | After 1× pref on $20M raised |
|---|---|---|---|
| $50M | 0.30% | $150,000 | ~$90,000 |
| $150M | 0.30% | $450,000 | ~$420,000 |
| $500M | 0.30% | $1,500,000 | ~$1,470,000 |
The lesson: equity value is highly exit-dependent and skewed toward large outcomes. Treat it as option value on the upside scenario, not a guaranteed component of your compensation.
Step 7: Ask These Questions Before You Sign
You're entitled to ask these. Any company that gets defensive when asked is telling you something important:
- What is the fully diluted share count?
- What is the current 409A valuation, and when was it last updated?
- What is the total capital raised to date, and what are the liquidation preferences?
- What is the post-termination exercise window?
- Is there acceleration on change of control? Single or double trigger?
- What option pool refresh cadence do you typically use for employees at my level?
Step 8: Negotiate
Equity is more negotiable than most candidates assume — often more negotiable than base salary at early-stage companies, because it doesn't immediately affect burn rate.
Know the band before you counter
Ask what the typical equity range is for your level and role. Founders are used to this question and will generally tell you. If you're offered the bottom of the band, negotiating to the middle is straightforward.
Counter with a specific number, not a vague ask
Rather than "I was hoping for more equity," say: "Based on the fully diluted share count and the last round valuation, I'd like to explore landing at 0.25% rather than 0.18%. Is there flexibility there?" Specific numbers signal you've done the math and are negotiating in good faith.
The 10–25% rule
For most mid-level and senior IC offers, a counter of 10–25% more equity than the initial offer is reasonable and often granted without friction. The ask rarely kills an offer. A polite, specific equity counter is one of the lowest-risk negotiations in an offer process.
Trade cash for equity if you believe in the company
Some companies will let you trade base salary for additional equity, particularly at the seed and Series A stage. If you're highly convicted on the company's trajectory and your personal financial situation allows it, this can be a high-leverage option. Get any such arrangement documented clearly.
The One Calculation That Matters
Before you sign, run this exercise: take the last round valuation, apply your ownership percentage, subtract the preference stack, and ask yourself — at what exit multiple does this become meaningful compensation for the risk I'm taking?
If the answer requires a 20× outcome, understand you're making a venture-style bet. If it's meaningful at 5×, that's a much more achievable threshold. Neither answer is wrong — the point is to make the choice with open eyes.
Equity at a startup is not guaranteed compensation. It's a structured, illiquid bet on a future outcome, with real strings attached. The candidates who do best — and who negotiate most effectively — are the ones who treat it that way from the start.