How to negotiate equity when joining a startup: the four levers

Take a typical offer letter. Fifteen basis points of equity, a four-year vest with a one-year cliff, $145,000 base. Anyone reading it for the first time asks the same question: is this a good offer?
The paragraph contains one and a half of the four numbers you need to answer. A startup equity grant is priced by four levers, and the recruiter is trained to disclose one of them cleanly. Getting the other three is the negotiation.
The offer paragraph means nothing without a denominator
"0.15% equity, 4-year vest" is a three-part sentence. Only one part is decodable without more data.
The 0.15% is a fraction of something. Fraction of what, and out of how many total shares, changes the paper value by orders of magnitude. At a $50M post-money valuation, 0.15% is $75,000. At $500M, it is $750,000. If the number is quoted against a stock-option pool that has already been reserved rather than the fully-diluted share count, the same 0.15% might actually be 0.09% of the real cap table.
Startup equity negotiation begins here. Before asking for more equity at a startup, you need to know exactly what "more" would mean against a specific denominator. Otherwise you are haggling over a symbol.
The recruiter has the denominator. Ask for it in writing before you counter-propose anything. Recruiters who cannot produce the number within a business day are working at companies where the answer is materially worse than the summary implies. You have learned something either way.
Lever 1: fully-diluted percentage, not share count
The number to ask for is your grant expressed as a percentage of the fully-diluted share count as of the offer date. Fully-diluted means all common, all preferred, all outstanding options, all unallocated options in the pool, all warrants, all convertible notes and SAFEs that would convert if the next round priced today.
Share count is a distraction. "You are being granted 50,000 shares" tells you nothing until you know the company has 40M shares outstanding fully diluted, which makes your grant 0.125%, which reads different from the 0.15% the recruiter quoted because the recruiter was working from a pre-option-pool-refresh number.
The safe follow-up: request the current fully-diluted share count and the last-round post-money valuation on the same email. Those two numbers times your percentage give you the paper value of the grant at today's valuation, before any further growth, before any dilution from future rounds, and before the strike price is subtracted.
Lever 2: strike price, 409A, and the spread
Your incentive stock options come with a strike price. That strike is set by the company's most recent 409A valuation, an independent appraisal of the common stock required by Internal Revenue Code section 409A for any grant of deferred compensation. If the last 409A valued the common at $2.40 and your grant is 50,000 options at a $2.40 strike, your day-one spread is zero. Every dollar the common appreciates above $2.40 is yours per share, subject to exercise cost and taxes.
Ask for: the current 409A per-share strike, the last-round preferred-share price, and the date of each. The ratio between the preferred price and the common strike tells you how much upside the venture capitalists have already priced in. If the preferred is $12 and the common is $2.40, the outside valuation is roughly 5x the 409A. That is your paper multiple before any further growth.
Negotiating stock options at a new job is really negotiating three numbers together: grant size, strike price, and preferred-share price. The recruiter has all three. Ask for all three in the same email.
Levers 3 and 4: vesting and double-trigger acceleration
Four-year vest with a one-year cliff is the modal schedule for junior hires. Grant size and vesting length are usually fixed at that level. Two adjacent terms are usually open: acceleration on change of control, and the post-termination exercise window.
Acceleration on change of control. Double-trigger acceleration means: if the company is acquired and your role is eliminated within a defined window, usually 12 to 18 months post-close, the unvested portion of your grant vests immediately. Single-trigger acceleration vests on acquisition regardless and is rarer. Ask for double-trigger in the offer letter. Senior hires ask for it routinely and often get it. Most junior candidates never ask, and never get it. That matters when the acquirer decides to consolidate your team on day thirty.
Post-termination exercise window. The default is 90 days. If you leave a company where you have vested $200,000 of ISOs at a $12 strike, you owe the strike price in cash within 90 days to exercise, or the options expire worthless. A 10-year post-termination exercise window converts ISOs to NSOs after 90 days but keeps the options alive. A few companies have adopted extended windows (Pinterest moved to a seven-year window back in 2015); most still have not. If you plan to leave before you plan to exercise, this term is worth more than a base-salary bump.
The two-column comparison: how to actually price this offer
The question every candidate is really asking is equity vs salary at startup terms, priced against a specific alternative. Say the alternative is $195,000 base plus $20,000 in annual RSUs at a public company: about $215,000 a year, with the RSU portion liquid on vest.
The startup offer: $145,000 base, 0.15% of a $50M post-money startup. Paper equity value $75,000, granted at a $2.40 strike, vesting over four years. If she exercises and the company exits at 5x its current valuation in year six, the pre-tax spread is roughly $300,000. If it exits flat or dies, the spread is zero.
Now the twist. In most venture-backed startup outcomes, the exit is either zero (the company dies) or a liquidation preference wipeout, in which the preferred stack is paid first from proceeds and common shareholders, meaning you, receive very little. Preferred stacks of 1x to 3x participating are common in bridge and down-round scenarios. Run the decision math from the conservative liquidation-preference outcome, which is often single-digit thousands. The unicorn-scenario paper gain belongs in the pitch deck.
A fair equity offer at a startup, priced this way, is compensation for optionality. Your salary gap over four years is what you are paying for a lottery ticket weighted by the probability of a clean exit above the preference stack. In the sample case: a $70,000 annual gap × 4 years = $280,000 in foregone cash, for a probability-weighted paper value in the tens of thousands. That is a below-market ticket. Ask for more.
Ask for the fully-diluted number and the 409A before you counter. Recruiters who have the numbers tend to come back with a corrected grant on the right denominator, and acceleration is often a one-line addition once someone asks. That corrected version is the offer worth deciding on.
References
- Wikipedia. "Internal Revenue Code section 409A." The federal statute that requires an independent valuation of common stock before any grant of deferred compensation. Explains the 409A appraisal cadence (typically every 12 months or after a material event) and why the strike price on new grants tracks the common-stock 409A rather than the preferred-share price.
- Wikipedia. "Liquidation preference." The clause in preferred-stock financings that pays the preferred stack first from acquisition or liquidation proceeds. Explains participating vs non-participating preferences, 1x vs multiple preferences, and why the same headline exit price can produce very different outcomes for common shareholders.