# How to handle the situation if a co-founder has to leave?

> Co-founder leaving? Learn how to manage equity, dead equity, and Belgian legal rules (WVV) to protect your startup's future.

- **Author:** David Vanhoudhoven
- **Category:** FrAt3ycTNlDFiLc76yf2
- **Published:** 2026-03-30
- **Language:** en

## You built this together. Now one of you is leaving — and the equity stays.
It starts quietly. One founder handles less. Meetings feel off. Decisions take longer because the two of you aren't actually aligned anymore. Someone's pulling harder than the other. The energy is different and everyone on the team can feel it even if nobody says it out loud.
Then one day the conversation happens. And suddenly you're not just managing a difficult personnel situation — you're managing one of the most legally and emotionally complex things a startup can face. Your co-founder is leaving. Their equity doesn't.
This is more common than people admit. Less than one in three co-founding teams stays together past four years. About 65% of startups that fail cite co-founder conflict as a contributing factor. And yet very few founders prepare for it, because talking about what happens when one of you leaves feels like admitting the whole thing might not work.
This article is about what actually happens — legally, operationally, and on your cap table — and what you can do about it.
## Why Co-Founder Breakups Happen
The reasons are rarely dramatic. Most co-founder splits don't involve scandal or betrayal. They happen because two people who were aligned at the start gradually become less so.
The most common causes: one founder is doing significantly more than the other. The company's direction shifts and one founder doesn't want to go where it's heading. Life circumstances change — a health issue, a family situation, a better opportunity. Or the relationship simply erodes under the pressure of building something hard with not enough money and not enough time.
What makes it especially difficult is that co-founder breakups often have a long lead-up. You know something is wrong well before the conversation happens. The question is whether you act on it or manage around it — and most founders manage around it far longer than they should.
 ⚠️ Warning: The longer you delay a co-founder exit that both parties know is coming, the worse the terms usually get. Early departures are cleaner, cheaper, and easier to explain to investors. A co-founder who limps along for another 18 months before leaving often generates more damage — to the team, the cap table, and the company narrative — than one who leaves cleanly at the first clear signal.
## The Equity Problem Nobody Prepared For
Here's what most early-stage founders don't fully grasp until it becomes their problem: equity and role are completely separate things.
You can remove someone from their operating role. You can stop paying their salary, revoke their access, take back their company laptop. But you cannot unilaterally take back their shares. Those are their legal property. Unless your shareholder agreement says otherwise — and most early startups don't have one that's tight enough — they leave with what they've earned.
This is where the concept of dead equity becomes real.
Dead equity is equity held by someone who is no longer contributing to the company. It sits on the cap table doing nothing productive. It can't be used to compensate new hires. It makes your company look messy to investors. And it can complicate or outright block future funding rounds.
How bad dead equity gets depends entirely on what you set up — or didn't set up — at the start.
## Vesting: The One Structure That Changes Everything
Vesting is the most important structural decision a founding team can make, and most founders either skip it or do it loosely because it feels awkward to bring up at the beginning.
Here's how it works: instead of giving co-founders their full equity stake on day one, you set it up so they earn it over time. The most common structure is a four-year vest with a one-year cliff — meaning nothing vests until the twelve-month mark, then the rest accrues monthly. If a founder leaves before the cliff, they leave with nothing. After the cliff, they leave with what they've earned.
The cliff is a protection mechanism. It's why the period between months nine and eighteen is the most volatile window in most founding teams — one or both founders can feel the cliff approaching and start making decisions about whether to stay or go.
 💡 Quick tip: Four-year vesting was the standard for a long time, but it's increasingly seen as too short. On a four-year plan, a founder who leaves at the halfway point can still own 12–13% of your company. Some investors and legal advisors now recommend six- or even eight-year vesting schedules for founding teams, particularly when the company is pre-product and pre-revenue. The equity should reflect ongoing contribution — not a single moment in time.
The problem is that even with vesting in place, what happens to already-vested shares when someone leaves is usually undefined. This is where a shareholder agreement with proper leaver clauses is essential.
## Leaver Clauses: Good Leaver, Bad Leaver
A leaver clause is a provision in your shareholder agreement that defines what happens to a departing founder's shares — and it's the difference between a clean exit and a messy one.
The two standard categories are good leaver and bad leaver.
A good leaver is someone who departs for reasons outside their control — illness, family circumstances, or a mutual and amicable decision. In a good leaver scenario, the departing founder typically keeps their vested shares and may be given the option to sell them back to the company or remaining founders at fair market value.
A bad leaver is someone who departs due to misconduct, a serious breach of their obligations, or leaves to start a competing business. Bad leaver provisions can allow the company to buy back shares — sometimes at nominal value, sometimes at a discount — as a consequence of the departure circumstances.
Most early founding teams draft a shareholder agreement late — after they've already started working, already allocated equity, and already built up the kind of interpersonal awkwardness that makes the conversation feel unnecessary. By the time the problem arrives, the legal protections they needed are either missing or too vague to enforce cleanly.
## What "Removing" a Co-Founder Actually Involves
When founders talk about wanting to "fire" a co-founder, what they usually mean is two separate things that get conflated.
The first is removing them from their operational role — their title, their responsibilities, their access, their authority to act on behalf of the company. In most company structures, this requires a board resolution. If the co-founder sits on the board, you'll need enough other votes to outvote them — which is why board composition matters as much as equity split.
The second is addressing their equity. These are separate conversations that require separate processes. You can remove someone from their role tomorrow. Resolving the equity can take weeks or months and will almost certainly involve lawyers and, in many cases, a formal valuation of their stake.
 ✅ Best practice: Never conflate the operational exit with the equity resolution. Address them sequentially. Agree on the operational exit first — what their last day is, what they hand over, what their formal role becomes — before moving to the equity conversation. Mixing the two conversations creates leverage dynamics that make both harder to resolve.
The most common ways to resolve the equity side are:
Buyback: The company, the remaining founder(s), or an incoming investor purchases the departing founder's shares. This requires agreeing on a valuation, which is rarely simple.
Secondary sale: The departing founder sells their shares directly to a new investor. This is cleaner for the cap table and avoids the company having to find cash for the buyback.
Negotiated reduction: Less common, but in cases where both parties want a clean resolution, the departing founder agrees to return or cancel a portion of their shares in exchange for other consideration — a longer payout, a consulting agreement, an accelerated vest on remaining equity.
## What Investors See When They Look at Your Cap Table
A messy co-founder departure is one of the most common Series A conversation killers. Not because investors are inflexible — but because unresolved equity situations create uncertainty that makes them uncomfortable putting money in.
The questions they ask are practical: Can this person block future decisions? Are they a flight risk on a signed ESOP? Could they sell their shares to a third party without your knowledge? Is there litigation risk? Does the story hold together?
 ⚠️ Warning: If your cap table shows a departed co-founder holding more than 8–10% of your company with no vesting restrictions and no resolution in sight, you are likely creating a fundraising obstacle. This isn't about optics — it's about control and risk. Investors need to know who owns what, who can make decisions, and whether that picture will change without their input.
The cleanest outcome before a funding round is a fully documented exit: a separation agreement signed by both parties, equity either bought back or clearly disclosed, and a clean narrative about why the change happened and what the company learned from it.
## The Belgian and European Legal Framework
Belgium doesn't have specific startup legislation covering co-founder disputes, but the structures that govern them are clear — and ignoring them is expensive.
Het Wetboek van Vennootschappen en Verenigingen (WVV, 2019): This is the governing company law for Belgian entities, including the BV (besloten vennootschap / société à responsabilité limitée). It sets out the rules for share transfers, board procedures, and shareholder rights. Share transfers in a BV are subject to approval procedures — you typically can't just sell your shares to a random third party without offering them first to existing shareholders. This is called het recht van voorkoop.
De aandeelhoudersovereenkomst: This is where your real protection lives. Belgian company law sets minimum rules, but a properly drafted shareholder agreement between co-founders can add significant additional structure — vesting schedules, leaver clauses, drag-along rights, tag-along rights, anti-dilution provisions, and dispute resolution mechanisms. If you don't have one, you're operating on defaults that were not designed for your situation.
Notaris involvement: Share transfers in a Belgian BV don't always require a notary, but any changes to the articles of association (statuten) do. If you're restructuring the cap table in a way that requires amending the statutes — which some buyback scenarios do — factor in notary time and cost.
GDPR: Performance documentation, written warnings, and any HR-related records generated during a co-founder dispute are personal data under GDPR. Handle them accordingly — proportionate retention, controlled access, and documented lawful basis. The Gegevensbeschermingsautoriteit (Belgian DPA) actively enforces this in commercial contexts.
## What It Does to Your Team
The people building your product are watching all of this. Even if the details are confidential, they can feel when the dynamic at the top has changed.
Research published in the Journal of Business Venturing studied founding team exits and found that teams which failed to create psychological closure around a co-founder departure experienced significantly higher internal conflict and, in several cases, team failure — not because of the departure itself, but because of the vacuum it left and the way it was handled.
The silence is usually worse than the truth. Teams that receive an honest, brief, forward-focused explanation from the remaining founder tend to stabilise faster than those left to fill the gap with speculation.
 💡 Quick tip: You don't need to share the details of the equity negotiation or the reasons for the exit. You do need to say: there's been a change, it was considered carefully, here's who owns what going forward, and here's what the plan is. Then follow the plan. When founders go silent after a split, rumour fills the space — and rumour is almost always more destabilising than the actual facts.
Hiring platforms like Joobs increasingly surface team signals alongside job listings — candidate reviews, culture indicators, team stability — which means how you navigate this publicly matters beyond just the immediate team. Your next engineering hire will look for signals about whether this is a company they can trust.
## How to Rebuild After a Founder Exit
Once the dust settles, the work is operational.
If the departing founder held a technical, commercial, or product role that now needs to be covered, be honest with yourself about the gap. The worst outcome is pretending the capacity still exists, distributing the load unevenly across remaining team members, and watching everyone burn out while the company quietly falls behind.
The best outcome is treating the gap as a design opportunity. You now know exactly what the role requires, what went wrong before, and what kind of person — skill set, working style, communication patterns — fits better. Use that.
 ✅ Best practice: When you write the job description for the role left behind by a departing co-founder, be specific about what you actually need — not what the original job title said. A departure often reveals that what you hired for at the founding stage is not what the company needs at its current stage. The cleaner you are about that gap, the better the next hire.
If the exit affected your cap table in a way that left dead equity, address it before your next round — not during due diligence. A clean explanation of what happened, what was agreed, and what the structure looks like now is always better than an investor discovering it halfway through a term sheet conversation.
## FAQ
Do I have to pay out a co-founder's equity when they leave?Not necessarily. If your shareholder agreement includes vesting and buyback provisions, the terms of the exit determine what's owed. If there's no agreement, the co-founder keeps whatever shares they legally own, and any buyback is a negotiation — not an obligation. Which is exactly why the agreement needs to exist before the problem does.
What if my co-founder refuses to sign a separation agreement?They're not obligated to. A separation agreement is a voluntary resolution. If they refuse, you may need to manage the ongoing relationship as a shareholder — meaning they keep their rights, potentially including voting rights, information rights, and the right to participate in future rounds. This is one of the strongest arguments for resolving things cleanly while the relationship is still functional.
Can I dilute a co-founder out of the cap table?Not in any meaningful sense — at least not without significant investor capital. In a Belgian BV, existing shareholders typically have pre-emption rights on new share issuances. Intentionally diluting a co-founder without proper process creates serious legal exposure. Don't try to engineer around the problem through the cap table. Solve it through negotiation and documentation.
How do I explain a co-founder departure to investors?Briefly and factually. Something happened, you addressed it, here's the current structure, here's why the team is stronger or better positioned now. Investors understand that founding teams evolve — especially if you have documentation showing the structure is clean. What they distrust is evasion or surprise.
What if we just can't agree on anything — equity, terms, next steps?Then you need a commercial mediator or, ultimately, a lawyer. In Belgium, disputes between company shareholders are handled in the ondernemingsrechtbank (commercial court). It's slow, expensive, and often destroys what's left of both the company and the relationship. Almost any negotiated outcome is better.

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*Source: [Joobs.be](https://joobs.be/en/blog/how-to-handle-the-situation-if-a-co-founder-has-to-leave)*