Founder Vesting Schedules: How They Work and What to Negotiate

What Is Driver-Based Revenue Forecasting?

A revenue forecast is a projection of the money your business will earn over a defined future period. There are two ways to build one:

Top-down forecasting starts with the total addressable market and works down to a market share assumption: “The UK B2B software market is worth £10 billion. If we capture 0.1%, we generate £10 million in revenue.” Useful for sizing the opportunity, useless for operational planning. Investors have heard thousands of 0.1% market share projections and are rightly sceptical.

Bottom-up, driver-based forecasting starts with the specific activities that generate revenue: “We have capacity to run 20 outbound sales conversations per week. Our conversion rate is 10%. Our average contract value is £12,000 per year. That gives us 2 new customers per week, or roughly 100 new customers per year, generating £1.2 million in new ARR.” Every assumption in that chain is testable, improvable, and explainable.

Driver-based forecasting is also the input layer for your 3-statement model — your revenue drivers feed the income statement, which integrates with the balance sheet and cash flow statement.

Why a Revenue Forecast Startup Needs a Different Approach

Established businesses forecast revenue by extrapolating historical data. Startups do not have historical data. The entire forecast must be built on forward-looking assumptions rather than trend lines. A driver-based model built on transparent assumptions is actually more useful to an early-stage investor than a statistical extrapolation, because it makes the business logic explicit and discussable.

The Core Framework: Identify Your Revenue Drivers

Vesting is one of the few cap table topics where the founder's instinct is reliably wrong. It feels like a loss of control. It is closer to insurance. If you are new to the underlying share mechanics, cap table explained covers the basics this post builds on.

What is founder vesting and why would I agree to it?

Founder vesting is an arrangement under which your shares, which you legally own from day one, can be bought back by the company at a nominal price if you leave before you have earned them. You earn them by continuing to work. The technical name is reverse vesting, and the distinction from ordinary option vesting matters.

With an employee option, you have the right to buy shares in the future, and that right accrues over time. With founder reverse vesting, you already own the shares outright. You hold them, you vote them, you receive dividends on them. What the company holds is a repurchase right over the unvested portion, which lapses month by month as you serve. If you leave, the company can buy back whatever is still unvested, usually at the price you originally paid, which for founders is typically a nominal amount like $0.0001 per share.

You would agree to it for three reasons, and none of them is "the investor made me".

The first reason is your co-founders. Startups fail more often from co-founder breakdown than from competition. When one of three founders decides at month nine that this is not for them, and you have no vesting, that person keeps their full stake and you get to build the entire company around a passenger. Every hour you work for the following eight years enriches someone who stopped showing up. This is not a hypothetical risk. It is the single most common way early equity arrangements go wrong.

The second reason is fundraising. An investor looking at your cap table will see the equity of anyone who has left. Dead equity, meaning a large stake held by someone with no ongoing contribution, is a genuine problem for the business: it means less equity available to attract the people you actually need, and it means the remaining team's incentives are diluted. Investors will either require vesting to be put in place as a condition of the round, which is the normal outcome, or price the round to reflect the problem. Since they will require it anyway, agreeing to it before the round means you set the terms rather than accepting theirs. Our term sheet explained walk-through covers where this appears in the conditions precedent.

The third reason is that it protects you. If you are the founder who stays, vesting is entirely in your favour. Most founders imagine themselves as the one who might leave and resent the constraint. Statistically, on a team of three, you are twice as likely to be one of the two who stay.

How does a standard four year vesting schedule actually work?

Four years total, with a one year cliff, then monthly thereafter. Nothing vests for the first twelve months. On the first anniversary, 25% vests in a single lump. After that, 1/48th of the total vests each month for the remaining 36 months.

The cliff exists to handle the fast failure case. Someone who joins, discovers within a few months that the fit is wrong and leaves at month seven should walk away with nothing, because seven months of work does not earn a permanent stake in a company that might run for a decade. The cliff makes that automatic and unemotional. Without it, you would be negotiating a settlement with someone at exactly the moment neither party is thinking clearly.

The monthly vesting after the cliff exists because time served should be rewarded continuously. Annual vesting creates perverse incentives around anniversaries and produces cliff-edge unfairness: leaving at month 23 under annual vesting earns you exactly what leaving at month 12 earns.

Let us make this concrete. Three founders, 8,000,000 shares issued at incorporation.

Founder	Shares	Ownership
Priya (CEO)	3,200,000	40.00%
Tom (CTO)	2,800,000	35.00%
Nadia (COO)	2,000,000	25.00%
Total	8,000,000	100.00%

All three are on standard four year monthly vesting with a one year cliff, starting at incorporation.

Nadia's schedule. Total 2,000,000 shares over 48 months. Monthly increment: 2,000,000 / 48 = 41,666.67 shares per month. In practice the documents round, so call it 41,666 shares per month with the remainder trued up at the end.

At the cliff, month 12, she vests 12 months' worth in one go: 12 x 41,666.67 = 500,000 shares, exactly 25% of her grant. Then 41,666.67 per month thereafter.

Month	Months vested	Nadia's vested shares	% of her grant
6	0 (pre-cliff)	0	0.0%
11	0 (pre-cliff)	0	0.0%
12	12	500,000	25.0%
14	14	583,333	29.2%
24	24	1,000,000	50.0%
36	36	1,500,000	75.0%
48	48	2,000,000	100.0%

Check month 14: 14 x 41,666.67 = 583,333.33, so 583,333 shares. As a share of her 2,000,000 grant: 583,333 / 2,000,000 = 29.17%. Correct.

What happens to the cap table when a founder leaves at month 14?

The unvested shares are repurchased and cancelled, which shrinks the total share count and mechanically increases everyone else's percentage. This is the part founders rarely model, and it is the whole point of the exercise.

Nadia leaves at month 14. She has vested 583,333 shares. Her unvested balance is 2,000,000 - 583,333 = 1,416,667 shares. The company exercises its repurchase right at her original purchase price, buys those shares back and cancels them.

New total shares: 8,000,000 - 1,416,667 = 6,583,333.

Founder	Shares	New ownership
Priya	3,200,000	48.61%
Tom	2,800,000	42.53%
Nadia (departed, vested only)	583,333	8.86%
Total	6,583,333	100.00%

Check the percentages. Priya: 3,200,000 / 6,583,333 = 48.61%. Tom: 2,800,000 / 6,583,333 = 42.53%. Nadia: 583,333 / 6,583,333 = 8.86%. Sum: 48.61 + 42.53 + 8.86 = 100.00. Correct.

Now compare to the world without vesting, where Nadia keeps all 2,000,000 shares and the total stays at 8,000,000: Priya 40.00%, Tom 35.00%, Nadia 25.00%.

Scenario	Priya	Tom	Nadia
No vesting	40.00%	35.00%	25.00%
Standard vesting	48.61%	42.53%	8.86%
Difference	+8.61pp	+7.53pp	-16.14pp

Priya and Tom gain 16.14 percentage points between them, transferred from someone who is no longer contributing. If this company eventually exits at $200m, and assuming for illustration no subsequent dilution, that 16.14pp is $32.3m that goes to the people who built the company instead of the person who left in year two. That is the entire argument for vesting in one number.

Note that the cancelled shares do not have to be cancelled. Some companies return them to the option pool instead, which keeps the share count at 8,000,000 and gives the company 1,416,667 shares to hire Nadia's replacement with. That is often the better commercial outcome: rather than the founders quietly absorbing the benefit, the company uses it to solve the problem the departure created. Which route to take is worth deciding in advance and writing down, because deciding it in the emotional aftermath of a departure is not ideal.

What is an 83(b) election and why does missing it hurt so much?

An 83(b) election is a filing that tells the tax authority to treat your restricted shares as taxable now, at today's near zero value, rather than as they vest at whatever the shares are worth then. Missing it can convert a nominal tax bill into a very large one.

Here is the mechanism, using the US rules since that is where the 83(b) name comes from. Restricted shares subject to a repurchase right are, by default, taxed as the restriction lapses. Each month, as your shares vest, you have income equal to the value of the shares that vested minus what you paid for them.

Take Nadia. She bought 2,000,000 shares at $0.0001, paying $200 in total. Suppose the company does well and the fair market value per share rises over her four years: $0.0001 at grant, $0.40 by month 12, $1.10 by month 24, $2.80 by month 36, $6.00 by month 48. Those are the sort of figures a 409A valuation would set.

Without an 83(b) election, roughly speaking, she recognises income as each tranche vests:

Vesting event	Shares vesting	FMV per share	Value	Cost basis	Taxable income
Cliff, month 12	500,000	$0.40	$200,000	$50	$199,950
Months 13 to 24	500,000	$1.10	$550,000	$50	$549,950
Months 25 to 36	500,000	$2.80	$1,400,000	$50	$1,399,950
Months 37 to 48	500,000	$6.00	$3,000,000	$50	$2,999,950
Total	2,000,000		$5,150,000	$200	$5,149,800

Check: 199,950 + 549,950 + 1,399,950 + 2,999,950 = $5,149,800. And $5,150,000 - $200 = $5,149,800. Correct.

Nadia owes ordinary income tax on $5,149,800 spread across four years, on shares she cannot sell, in a private company, with no liquidity to pay the bill. At a 40% blended rate that is roughly $2.06m of tax on paper gains she cannot touch. If the company then fails, she has paid real tax on value that evaporated.

With a timely 83(b) election, filed within 30 days of the share purchase and not a day later, she elects to be taxed at grant instead. Taxable amount at grant: 2,000,000 shares at $0.0001 FMV, which is $200, minus the $200 she paid. Taxable income: $0.

Her entire future gain becomes capital rather than ordinary income, and it is only taxed when she actually sells. She has converted a $2.06m phantom tax bill into a form she signed and posted.

The 30 day deadline is absolute and there is essentially no relief for missing it. This is the single highest-consequence administrative task in a founder's first month, and it is routinely forgotten because it happens at exactly the moment nobody is thinking about tax. File it, keep the proof of posting, and put a copy in your data room folder immediately, because every future investor's lawyer will ask for it.

Two important caveats. First, the specific rules, deadlines and even the existence of an equivalent election vary enormously by country. The UK, for example, has a different regime entirely, with section 431 elections doing broadly analogous work under quite different rules. Second, this is educational content, not tax advice. The numbers above illustrate a mechanism, not your situation. Speak to a tax adviser in your jurisdiction before your shares are issued, not after, because almost every good option here expires quickly.

Should founders get credit for time already served?

Yes, and this is the most winnable negotiation in the whole discussion. If you incorporated two years ago and have been working on the business since, you should not restart a four year clock from zero at the seed round.

The convention is that vesting starts from when you actually started, not from the financing date. If you have been full time for 18 months when the seed closes, you should be 18/48ths vested on day one of the new schedule, with 30 months remaining. Investors generally accept this because it is obviously fair and because they would rather not have a founder who feels retrospectively cheated.

Work the numbers for Priya. 3,200,000 shares, 18 months already served at seed close.

Immediately vested: 18/48 x 3,200,000 = 1,200,000 shares, or 37.5% of her grant. Remaining unvested: 3,200,000 - 1,200,000 = 2,000,000 shares, vesting at 3,200,000/48 = 66,666.67 per month for the next 30 months.

Check: 30 x 66,666.67 = 2,000,000. And 1,200,000 + 2,000,000 = 3,200,000. Correct.

Compare this to accepting a fresh four year schedule from the seed date. Priya would be at zero on close, subject to a new one year cliff, and would not be fully vested until month 66 of the company's life rather than month 48. She would have given away 18 months of already-earned equity for nothing. On a company that exits in year six, the difference is entirely academic. On a company where she and her co-founder fall out in year three, it is enormous.

Three things to insist on, in rough order of importance.

Credit for time served, as above. This is standard and you should expect to win it.

No new cliff if you have already served past one. If you have been at it 18 months, a fresh 12 month cliff would mean a founder who has worked for two and a half years could still leave with a fraction of what they have earned. Credit for time served usually resolves this automatically, but check the drafting says so.

A clear definition of termination. The repurchase right should distinguish between leaving voluntarily, being fired for cause, and being fired without cause or leaving for good reason. If a majority of the board can fire you without cause and repurchase your unvested shares, your vesting schedule is worth much less than it appears. Good drafting either accelerates vesting on a without-cause termination or at minimum stops the repurchase right from applying to it. This one clause is worth more scrutiny than the headline vesting period, and it is where founders who only read the "four years, one year cliff" line get caught.

What is acceleration and which trigger should I ask for?

Acceleration means some or all of your unvested shares vest immediately on a defined event, almost always a change of control. Single trigger fires on the acquisition alone. Double trigger fires only if the acquisition happens and you are then terminated or your role is materially diminished.

Single trigger sounds better and is worse to ask for. From an acquirer's perspective, an acquisition that instantly fully vests the founding team is an acquisition that has just bought a company whose key people have no remaining financial reason to stay. Acquirers respond by discounting the price, by demanding new retention packages that come out of the founders' proceeds, or by walking. Investors resist single trigger for exactly this reason, and they are correct to.

Double trigger is the market standard for founders and it is the right ask. It says: if you buy us and keep us, we earn out our remaining vesting as we work, which is fair. If you buy us and fire us, or move the CEO to a regional sales role, we vest immediately, because you have taken away our ability to earn what we were promised. No reasonable acquirer objects to that, because it only costs them anything in the case where they have decided they do not want you.

Work an example. Tom, 2,800,000 shares, and the company is acquired at month 30.

Vested at month 30: 30/48 x 2,800,000 = 1,750,000 shares. Unvested: 2,800,000 - 1,750,000 = 1,050,000 shares.

Check: 1,750,000 + 1,050,000 = 2,800,000. Correct.

Under double trigger with full acceleration, if the acquirer terminates Tom without cause at month 33, the remaining 1,050,000 shares vest immediately, less whatever vested naturally between months 30 and 33. He earns his full stake.

If instead Tom stays, he continues vesting normally and is fully vested at month 48, eighteen months after the acquisition. That is the deal working as intended.

A common middle position is double trigger with partial acceleration: 12 months of vesting accelerates on a qualifying termination rather than all of it. For Tom at month 30, that would be 12 x (2,800,000/48) = 700,000 shares accelerating, leaving 350,000 unvested and forfeited. It is a reasonable compromise and often what gets agreed.

One structural note. Acceleration interacts with the liquidation preference stack in ways that are easy to miss. Accelerated shares are common shares, and common shares sit at the bottom of the waterfall. Full acceleration on an exit that does not clear the preference stack accelerates you into precisely nothing. Founders sometimes fight hard for acceleration terms that, at their realistic exit range, are worth zero, while conceding preference terms that are worth millions. Model both together.

How does vesting interact with fundraising and dilution?

It does not change your percentage, but it changes what your percentage is worth to you, and it changes what investors will pay.

Vesting does not dilute you. Your 40% is still 40% after you sign a vesting agreement, because you still own the same shares. What changes is your ability to walk away with them. Dilution comes from issuing new shares, which is a separate mechanism covered in cap table explained and, for early instruments, in the SAFE stacking arithmetic elsewhere in this series.

But the two interact at the round. An investor pricing a seed round is buying a team as much as a business, and the vesting schedule is the contractual expression of whether that team is committed. A cap table where the founders are two years into a four year schedule reads very differently from one where they are fully vested and free to leave the day after the money lands. Expect the former to price better.

Practically, put vesting in place before you raise, not during. Doing it during a round means doing it under time pressure with a counterparty at the table, which is a bad way to negotiate with your co-founders about the most emotionally loaded topic in the company. Doing it at incorporation, when nobody has any leverage and the shares are worth nothing, means the conversation is abstract and cheap. It also means the 83(b) window is open, which it will not be later.

Finally, keep the vesting schedule in your model. If your financial model has a cap table tab, it should carry vested and unvested columns that update by month, not just a static ownership split. When you are deciding whether you can afford to lose a co-founder, or what a departure does to the equity you have left for hiring, you want that answer in seconds. And when the departure conversation does happen, the arithmetic being already on the screen and agreed in advance takes a great deal of heat out of it. You can sanity check the hiring cost of replacing that person against your remaining runway with the runway and burn calculator.

Frequently Asked Questions

Can I put vesting in place after we have already been operating for a while? Yes, and you should if you have not already, but the tax position is more complicated than doing it at incorporation. Imposing a repurchase right on shares you already own outright can be a taxable event in some jurisdictions, and the 83(b) window that made it costless at incorporation is long gone. The usual approach is to credit time already served so the founders are not worse off in substance, and to take specific tax advice before signing anything. It is still far better to do it late than never, because an investor will require it at the round regardless and you would rather have negotiated it among yourselves first.

What happens if a founder is fired without cause? Do they lose everything unvested? It depends entirely on your drafting, which is why this deserves more attention than it usually gets. In poorly drafted documents, yes: the board can terminate you and repurchase everything unvested, which makes your vesting schedule far weaker than it appears. Better documents either provide acceleration on a without-cause termination, or disapply the repurchase right in that case, or define "cause" narrowly enough that it cannot be used as a pretext. Read the definition of cause carefully. If it includes anything resembling "failure to perform to the board's satisfaction", it is not a definition of cause, it is a definition of whenever they like.

Does vesting apply to shares I bought with my own money? Usually not, and this is a fair line to draw. If you contributed $50,000 of cash to the company in exchange for shares, that is an investment, not compensation for future work, and it is reasonable for those shares to be fully vested from the start. Keep the two clearly separated in the documents: a founder share allocation subject to vesting, and a separate purchased tranche that is not. The distinction gets murky if you are also being paid nothing, so document the cash contribution properly at the time.

Should advisors and early employees be on the same schedule as founders? No. Advisors typically vest over one to two years, often monthly with no cliff or a short three month cliff, because the commitment is smaller and shorter. Early employees typically get the same four year, one year cliff structure as founders, granted as options rather than restricted shares. The founder structure exists because founders are expected to be there for the full arc of the company. Applying it to an advisor giving you two hours a month is both unfair and unnecessary, and applying an advisor's schedule to an employee gives away equity far too quickly.

What if my co-founder refuses to accept vesting? Treat it as significant information, not as a negotiation to win. A co-founder who wants a permanent quarter of the company regardless of whether they stay is telling you something about how they see the commitment. The reasonable version of this objection is "I have been here two years and you have been here two months, why do we have identical schedules", and that is a legitimate point that credit for time served resolves. The unreasonable version is a refusal in principle. If you cannot resolve it now, when the shares are worth nothing and nobody has anything at stake, you will not resolve it in year three when they are worth millions and one of you wants out.

Further Reading

• What Is a Startup Financial Model?
• The Rule of 40 Explained
• Churn Rate Calculation and Cohort Analysis
• Runway and Burn Calculator
• Financial Model Pro