Contents
- What Vesting Actually Is (and Isn’t)
- The Standard "4-Year / 1-Year Cliff" Model
- Investors Won't Negotiate This
- The Nuances: Leavers and Acceleration
- The Bottom Line
- A Quick Note on Your Next Steps:
- Single-Trigger vs. Double-Trigger Acceleration
- Founder Vesting in Canada: Reverse Vesting and the Buyback
- The 83(b) Election for U.S. Founders
- Frequently Asked Questions
- Protect your Equity Before it is too late
- Protect your equity before it becomes too late
On day one, equity splits feel like a formality. Everyone is excited, the vision is clear, and the vibes are high. But reality has a habit of intervening. Founders burn out, roles shift, or a pivot creates a rift in the team. Especially when the startup doesn’t scale fast enough to support its founders, and reality, along with some hefty bills, kicks in.
Founder vesting is how you settle this in advance. Each founder’s shares are tied to time served, so a co-founder who leaves early keeps only the part already earned, and the company can buy back the rest, usually at the price the founder paid.
Vesting exists because ownership should be a marathon, not a sprint. Without it, you risk a situation where someone who left three years ago still owns 25% of your company while you’re doing 100% of the work. Kinda like lifting a dead horse.
What Vesting Actually Is (and Isn’t)
Vesting isn’t about “earning” your shares from scratch; it’s about keeping them. Technically, most founders use Reverse Vesting. You get all your shares upfront so you can vote and collect dividends, but the company has the right to buy them back for pennies if you walk away early.
The Golden Rule: It’s not a punishment for leaving; it’s a protection (and incentive) for those who stay.
The Standard "4-Year / 1-Year Cliff" Model
In the startup world, the “Standard” is a 4-year schedule with a 1-year cliff.
First – the Cliff (Months 0–12): You earn nothing. If you leave at month 11, you walk away with 0%.
Second – the “Pop”: On your first anniversary, 25% of your shares vest instantly.
Third – the Crawl: The remaining 75% vests in equal monthly increments (usually 1/48th of the total) over the next three years.
Investors Won't Negotiate This
To an investor, unvested equity is a “golden handcuff.” Without vesting, in addition to betting on your idea, they’re also betting on you being there to execute it. If a lead founder is 100% vested on day one, an investor sees a massive flight risk. Vesting is a signal that the team is professional, disciplined, and committed for the long haul.
The Nuances: Leavers and Acceleration
If you’re setting this up, you need to understand three key “human” variables:
- Good Leaver vs. Bad Leaver: If you’re fired without cause or have to leave for a medical reason, you’re a “Good Leaver” and usually keep your vested shares. If you’re fired for fraud or breach of contract (“Bad Leaver”), the company might have the right to claw back even your vested shares.
- Double-Trigger Acceleration: This is the founder’s best friend. If the company gets bought (Trigger 1) and the new owners fire you (Trigger 2), your remaining shares vest immediately. This prevents an acquirer from firing you just to keep your equity.
- The 83(b) Election (The “Don’t Forget This” Part): This is a critical tax move in the USA. Maybe one of the most important parts of setting up a corporation with vesting mechanisms. When you have vesting shares, the IRS technically sees “value” being transferred to you every month. Without an 83(b) election filed within 30 days of getting your shares, you could end up with a massive tax bill on money you haven’t even made yet.
The Bottom Line
Think of vesting as a sign of respect for the future of the entity you’re building. It ensures that the people who build the value are the ones who own the value. Every serious startup deals with this. You can either set the rules now while you still like each other, or fight about it later in a lawyer’s office.
A Quick Note on Your Next Steps:
If you are setting this up now, look at founder-friendly acceleration clauses. Acceleration is usually the biggest point of contention during an acquisition.
Single-Trigger vs. Double-Trigger Acceleration
Acceleration decides what happens to unvested shares when the company is sold. Single-trigger acceleration vests some or all of them on one event, usually the sale itself. Double-trigger acceleration needs two events: the sale, and the founder’s termination without cause (or resignation for good reason) within a set period after it.
Buyers and investors usually resist single-trigger terms, because a team that is fully vested on closing day has less reason to stay through the integration. Double-trigger terms protect the founder from being let go just before the shares would have vested, while keeping the reason to stay. Some agreements accelerate only part of the unvested shares as a middle ground.
Founder Vesting in Canada: Reverse Vesting and the Buyback
In an Ontario or federal corporation, founder vesting is usually built as reverse vesting. The founder subscribes for all of their shares at the start, and a shareholders’ agreement or a separate share restriction agreement gives the corporation an option to buy back the unvested shares if the founder leaves before they vest. Our guide to shareholders’ agreements covers the leaver and transfer clauses that sit around it.
The buyback is a purchase by the corporation of its own shares, so corporate law limits it. Under section 30(2) of Ontario’s Business Corporations Act, a corporation may not pay to buy back its shares if there are reasonable grounds to believe it is, or would after the payment be, unable to pay its liabilities as they become due, or that its assets would then be worth less than its liabilities and stated capital. Section 31 relaxes this for a buyback under an agreement with a current or former director, officer or employee, but a solvency test still applies.
Federal corporations face the same test under section 34(2) of the Canada Business Corporations Act. Because an early-stage company may not pass it when a founder leaves, many agreements also let the other shareholders buy the unvested shares instead.
The 83(b) Election for U.S. Founders
In a U.S. corporation, shares that the company can buy back at cost if the founder leaves are “substantially nonvested” for tax purposes. Section 83(b) of the Internal Revenue Code lets the founder elect to include them in income in the year they are received, measured as their fair market value minus the amount paid, instead of being taxed on the value as each part vests. When founders buy their shares at formation for what they are worth, the amount included is usually zero.
The deadline is strict. Under Treasury Regulation section 1.83-2(b), the election must be filed no later than 30 days after the shares are transferred. If the 30th day falls on a Saturday, Sunday or legal holiday, an election postmarked on the next day that is not one of those is on time. The election cannot be revoked without the consent of the IRS.
The IRS publishes Form 15620, Section 83(b) Election, for this. The founder mails it to the IRS office where they file their federal income tax return and gives a copy to the company. A written statement that meets the regulation’s requirements also works.
Frequently Asked Questions
What is founder vesting?
Founder vesting ties a founder’s shares to time with the company. The founder usually holds all the shares from the start, but the company can buy back the unvested part, often at the price paid, if the founder leaves early. Shares vest on a schedule, most often over four years with a one-year cliff.
How does a 4-year vesting schedule with a 1-year cliff work?
Nothing vests in the first 12 months. On the first anniversary, 25% of the shares vest at once. The remaining 75% vests in equal monthly instalments over the next three years, so each month adds 1/48 of the total. A founder who leaves before the cliff has no vested shares.
What is reverse vesting?
Reverse vesting is the usual founder structure. The founder owns all of their shares from day one and can vote them, but the company holds a right to buy back the unvested portion if the founder leaves. As time passes, that right falls away from more of the shares until all of them are vested.
What happens to unvested shares when a founder leaves?
The agreement decides. Usually the company, or the other shareholders, may buy back the unvested shares at the price paid. Good leaver and bad leaver terms set what happens to the vested shares: a good leaver often keeps them or sells them at fair value, while a bad leaver may have to sell them at a lower price.
When does a U.S. founder have to file an 83(b) election?
No later than 30 days after the shares are transferred. The deadline is in section 83(b)(2) of the Internal Revenue Code and Treasury Regulation section 1.83-2(b). The election is mailed to the IRS on Form 15620, or as a written statement that meets the regulation, with a copy to the company, and it cannot be revoked without IRS consent.
What is the difference between single-trigger and double-trigger acceleration?
Single-trigger acceleration vests unvested shares on one event, usually a sale of the company. Double-trigger acceleration needs a second event as well, typically the founder’s termination without cause within a set period after the sale. Buyers and investors generally prefer double-trigger terms because the founder still has a reason to stay.
Protect your Equity Before it is too late
Founder vesting is not a luxury and not a startup trend. It is basic risk management. Every successful company implements it early because fixing equity problems later is expensive, emotional, and sometimes impossible. If you are starting a company, bringing in a co-founder, or restructuring ownership, this is the moment to get the structure right before real money and real pressure enter the picture.