How to Value Startup Equity: A Practical Framework
Roughly 90% of venture-backed startups fail to return capital to common shareholders, according to data aggregated from Cambridge Associates and the Kauffman Foundation. That number is not a reason to reject all equity — it is a reason to treat equity offers with the same scrutiny you would apply to the base salary. Most candidates spend hours negotiating salary and accept equity grants without doing any maths at all. This guide fixes that.
Why startup equity is harder to value than it looks
Equity in a private company has no market price. Unlike a publicly traded RSU that converts to cash on a known schedule, a startup stock option or common share is worth exactly what someone will pay for it at some future, uncertain event — usually an acquisition or IPO.
Three factors make private equity valuation genuinely difficult:
Liquidation preferences. Most venture-backed startups issue preferred shares to investors, not common shares. Preferred shareholders are paid first in any exit. A 1× non-participating liquidation preference means investors recoup their investment before you see a penny. A 2× preference doubles that threshold. If a Series C startup raised $80m at a 2× preference, the company must return $160m to preferred holders before common equity (including your options) participates. Many "successful" exits at $150m–$200m have returned nothing to employees.
Option pool dilution. Your percentage ownership shrinks with every new funding round and every option pool refresh. A 0.1% grant at Series A might be 0.04% by the time the company reaches a Series D. This is normal, but the math matters. Ask for your percentage after the most recent fully diluted cap table, not before the next anticipated round.
Exercise costs and tax. US employees holding ISOs face the alternative minimum tax (AMT) if they exercise early. UK employees on unapproved options are taxed as income at exercise. German and French tax treatment differs again. The nominal value of options on paper often overstates the after-tax cash you would receive.
For a deeper look at how options specifically work, the how to evaluate stock options guide covers strike prices, vesting, and exercise windows in detail.
A simple formula for valuing startup equity
You cannot know the exit price. You can build a range. Use this formula:
Expected equity value = (Exit valuation × your fully diluted %) × probability of exit × dilution haircut − exercise costs
Walk through each variable with real numbers:
- Exit valuation: Ask the founders what the board's base-case exit target is. Cross-check against comparable acquisitions in the sector. A B2B SaaS company might target 5–8× ARR; a consumer app might target strategic acqui-hire pricing.
- Your fully diluted %: Divide your shares by the total fully diluted share count (ask for this explicitly — founders must disclose it in the UK under the Companies Act and in the US during the offer process).
- Probability of exit: The venture data is sobering. Around 50% of Series A companies fail outright; of the survivors, fewer than 20% achieve an exit that returns more than 1× to common. At pre-seed, failure rates are higher still.
- Dilution haircut: A reasonable assumption is 40–60% dilution from your grant date to exit, depending on how many rounds remain.
- Exercise costs: If you have 10,000 options at a $1.20 strike price, your out-of-pocket exercise cost is $12,000 — before any tax liability.
Example: You are granted 0.15% of a Series B SaaS company with a $30m post-money valuation. The founders target a $200m acquisition in five years. Assume 50% dilution, a 15% probability of a meaningful common-share exit, and $8,000 in exercise costs.
Expected value = ($200m × 0.075%) × 0.15 − $8,000 = $150,000 × 0.15 − $8,000 = $22,500 − $8,000 = ~$14,500
Spread over five years, that is roughly $2,900 per year in expected equity value — not nothing, but not the headline $30,000 the grant looks like on paper.
What is total compensation? explains how to add this figure to base salary and bonus for a true comparison.
What questions to ask before accepting an equity offer
Most candidates accept equity without asking basic questions that any reasonable employer should answer. Here is a checklist:
- What is the fully diluted share count today? This lets you calculate your exact percentage rather than relying on a number of shares that is meaningless in isolation.
- What is the current 409A valuation (US) or last EMI valuation (UK)? This is the fair market value of common shares, which determines your strike price and your tax basis.
- What are the liquidation preferences on all preferred series? Ask for a summary cap table showing total preference overhang.
- What is the vesting schedule and cliff? Standard is four years with a one-year cliff, but some companies use three-year schedules or back-weighted vesting.
- What is the post-termination exercise window? The industry default is 90 days after leaving, which forces employees to exercise or forfeit. Some companies now offer 5- or 10-year windows. This matters.
- Has the company taken secondary liquidity? If founders or early investors have already sold shares, ask whether employees have the same right. Companies that have completed secondary rounds and excluded employees signal something about priorities.
If a recruiter cannot or will not answer questions 1, 3, and 5, treat the equity as worth zero in your calculations and negotiate accordingly.
How equity compares across stages and countries
Stage matters more than sector for equity percentage. Typical ranges by stage (based on aggregated data from compensation benchmarking platforms and published cap table studies):
| Stage | Software engineer (IC) | Senior engineer | Engineering manager |
|---|---|---|---|
| Pre-seed / Seed | 0.25%–1.0% | 0.5%–2.0% | 0.75%–2.5% |
| Series A | 0.1%–0.4% | 0.2%–0.75% | 0.3%–1.0% |
| Series B | 0.05%–0.15% | 0.1%–0.3% | 0.15%–0.5% |
| Series C+ | 0.01%–0.05% | 0.03%–0.1% | 0.05%–0.15% |
Geography affects both the percentage offered and the tax treatment. UK startups operating EMI schemes offer significant tax advantages — gains are taxed at capital gains rates (currently 18%/24% for higher-rate taxpayers) rather than income tax. French BSPCE warrants carry similarly favourable treatment for early employees. German virtual stock programmes (phantom equity) are more common than real equity grants and are taxed as income at payout, which significantly reduces net value.
In the US, the difference between ISOs and NSOs, and the AMT exposure on exercise, can change the after-tax value of an identical grant by 20–35%. See the RSU vs stock options comparison for how this plays out in practice.
How to factor equity into your overall offer evaluation
Equity should be one line in a total compensation model, not the headline number. The right approach:
- Calculate a conservative expected value using the formula above (use a 10%–20% exit probability unless you have strong evidence otherwise).
- Annualise it over your expected tenure — typically three to four years.
- Add it to base salary, annual bonus, pension/401(k) contributions, and any other cash benefits.
- Compare the total to market rate for your role, level, and location using benchmarked salary data.
According to ONS ASHE 2024, median total pay for software developers in London sits at approximately £72,000 (p50), with p75 around £90,000 and p90 above £110,000. BLS OEWS data for 2024 shows median software developer compensation in San Francisco at approximately $165,000 base, with total cash often 20–30% higher at the p75. If a startup is offering £55,000 base plus equity, the equity needs to credibly compensate for the £17,000 base shortfall — roughly £85,000 in expected equity value over four years just to break even with median market.
Use the full guide to evaluating a job offer to structure this comparison end to end.
Frequently asked questions
How do I find out what my startup equity is worth right now?
Ask for the most recent 409A valuation (US) or EMI valuation (UK) — this gives you the assessed fair market value of common shares. Multiply by your share count for a current book value. Note this is not the same as liquidation value; if preference overhang exceeds the current 409A valuation of the whole company, common equity is technically worth zero today.
What is a good equity percentage for a startup job?
"Good" depends entirely on stage. At Series A, 0.1%–0.4% for a senior individual contributor is within normal range. At pre-seed, anything below 0.5% for a founding engineer is on the low end. Percentages alone are less useful than dollar value — a 0.5% stake in a $5m seed company is worth less than 0.05% of a Series C company valued at $500m, assuming identical exit odds.
Should I take lower base salary in exchange for more equity?
Only if the equity is at an early enough stage that the percentage is meaningful and you can model a realistic path to exit. Taking a £15,000 base haircut for an extra 0.05% at Series C rarely makes financial sense. At seed stage with a 0.5% uplift and a credible product-market fit story, the trade-off may be worth modelling seriously. Run the expected value calculation first.
How does dilution affect my equity over time?
Each new funding round typically dilutes all existing shareholders proportionally unless anti-dilution provisions apply (and they usually only protect preferred investors, not employees). Assuming three to four future funding rounds from Series A to exit, cumulative dilution of 40%–60% of your grant percentage is a reasonable base case. Model this into your expected value calculation from day one.
Equity is only one part of what an offer is actually worth. Before you accept, benchmark the base salary and total cash component against real market data for your role, level, and location. CompVerdict does this instantly — enter your offer details and get a verdict backed by ONS, BLS, and ten other official government salary datasets, across 12 countries and 30+ cities, in under 30 seconds, with no sign-up required.