This article is for startup founders in Ireland who are setting up a company with co-founders or have already incorporated without proper ownership protections in place.If you're wondering whether you need founder vesting, how it actually works, or what happens if a co-founder leaves early, this guide covers why vesting protects everyone, the standard terms investors expect, and when to implement it before it becomes expensive and complicated.
Key Takeaways
• Implement founder vesting at incorporation with standard 4-year terms and 1-year cliff to avoid expensive restructuring later.
• All founders should have equal vesting terms; without vesting, a co-founder leaving early keeps full ownership despite minimal contribution.
• Standard vesting is 4 years with monthly vesting and 1-year cliff where 25% vests immediately after year one.
• Investors require founder vesting before investment; approximately 65% of startups fail due to co-founder conflict and team issues.
• Use reverse vesting where the company can buy back unvested shares at nominal value if founders leave early.
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What is Founder Vesting?
Founder vesting is an arrangement where founders earn their company shares gradually over time rather than owning them outright from day one.
Here's a simple example:
You and your co-founder each get 50% of the company shares. But instead of owning them immediately, those shares vest over 4 years. After year 1, you each own 12.5% (1/4 of your allocation). After year 2, you own 25%. After year 4, you own your full 50%.
If either founder leaves before the 4 years are up, they only keep the shares that have vested. The unvested shares return to the company, where they can be reallocated to remaining founders, new team members, or future hires.
Without vesting, if your co-founder quits after 3 months, they'd still own 50% of the company despite contributing almost nothing. With vesting, they'd leave with only a small percentage or possibly nothing at all.
Why Founder Vesting Matters
The numbers tell the story: roughly 65% of startups fail due to co-founder conflict and team issues. Founder departures are common, especially in the first two years.
What happens without vesting:
Two co-founders launch a company with 50/50 ownership. After 6 months, one founder decides it's not working out and leaves. They take their 50% with them.
The remaining founder now owns only 50% of the company they're building alone. The departed founder owns 50% despite no longer contributing. When the company raises investment or succeeds, the person who left early gets half the value.
This isn't hypothetical - it happens constantly and destroys companies.
What happens with vesting:
Same scenario, but with 4-year vesting. After 6 months, only about 12.5% of each founder's shares have vested (assuming monthly vesting). The departing founder leaves with their 12.5%, and the remaining 37.5% of their original allocation returns to the company.
The remaining founder can use those returned shares to bring on a replacement co-founder, hire key team members, or keep them to maintain their ownership percentage.
Vesting protects everyone - the company, the remaining founders, future investors, and even the founders themselves.
Standard Vesting Terms
While vesting schedules can be customized, most follow a standard structure that investors expect.
4-Year Vesting Period
The standard is 4 years total vesting time. Each founder's full share allocation vests gradually over these 4 years.
Most commonly, shares vest monthly (1/48th of total shares each month) or quarterly (1/16th each quarter). Monthly vesting is more founder-friendly because it's more granular.
1-Year Cliff
The "cliff" means nothing vests for the first year. Then, on the one-year anniversary, 25% of your shares vest all at once. After that, the remaining shares vest monthly or quarterly.
The cliff serves a specific purpose: it tests commitment. If someone leaves in the first year, they get nothing. This prevents situations where founders contribute for just a few months and walk away with shares.
Example Timeline:
- Month 0-12: 0% vested (cliff period)
- Month 12: 25% vests immediately (cliff vests)
- Month 13-48: Remaining 75% vests monthly (2.08% per month)
- Month 48: 100% vested
Acceleration Clauses
Some vesting agreements include acceleration provisions where vesting speeds up under certain conditions:
Single-trigger acceleration - All unvested shares vest immediately if the company is acquired. This is rare for founders (more common for employees).
Double-trigger acceleration - Unvested shares vest if both (1) the company is acquired AND (2) the founder is terminated without cause. This protects founders from being fired just before an acquisition to prevent their shares from vesting.
Most investors prefer no acceleration or double-trigger only. Single-trigger acceleration can complicate acquisitions because founders might be financially incentivized to leave immediately after the sale.
How Founder Vesting Actually Works
Vesting is typically implemented in one of two ways in Irish companies:
Reverse Vesting (Most Common)
Founders receive their full share allocation immediately at incorporation, but the company has the right to buy back unvested shares at nominal value if the founder leaves.
As time passes, the company's right to buy back shares gradually disappears. After 4 years, the company has no buyback rights - the shares are fully yours.
This approach is simpler to implement at incorporation and is what most Irish companies use.
Forward Vesting (Less Common)
The company initially issues only a small number of shares to founders. Additional shares are issued over time as they vest.
This creates more administrative work (multiple share issuances, multiple certificates) but can have certain tax advantages in some jurisdictions.
In practice, reverse vesting is the standard approach in Ireland.
Who Should Be Subject to Vesting?
All founders should have vesting terms. This includes you.
It's tempting to think "I'm committed, I don't need vesting" - but vesting protects everyone, including you. If your co-founder leaves early without vesting, you're the one harmed. By accepting vesting yourself, you ensure your co-founders also accept it.
Some founders try to negotiate different vesting terms for themselves versus co-founders. This creates tension and signals lack of trust. Equal vesting terms demonstrate equal commitment and partnership.
Executive hires and key early employees often also have vesting on their shares, though sometimes on different schedules (commonly 4 years with no cliff for employees, or 3-year schedules).
Advisors typically vest over shorter periods (1-2 years) if they receive equity.
Investors don't have vesting - they buy shares outright. Vesting is for people contributing time and effort, not capital.
When to Implement Vesting
Ideal timing: At incorporation
The absolute best time to implement founder vesting is when you first set up the company. Include vesting terms in your shareholders' agreement from day one.
At this point:
- No one has any expectation of immediate ownership
- There's no tax implications from implementing vesting
- It's a standard part of setup, not a difficult conversation
- Legal costs are minimal as part of overall formation
Second best: As soon as possible
If you've already incorporated without vesting, implement it as soon as you realize you need it. The longer you wait, the more complex and expensive it becomes.
Before raising investment
If you haven't implemented vesting yet, do it before talking to investors. Nearly all investors require founder vesting as a precondition of investment. If you negotiate this under investor pressure, founders feel forced rather than understanding it's protecting everyone.
Implementing vesting later is painful
Adding vesting after founders have held shares for months or years creates several problems:
- Founders feel like they're giving up something they already own (they are)
- May trigger tax consequences depending on how it's structured
- Requires all founders to agree (if one refuses, it can't happen)
- Creates suspicion and relationship tension
- Higher legal costs to restructure
Get it done early when it's easy and expected.
Vesting and Investment
Investors care deeply about founder vesting for obvious reasons.
If they invest €500,000 for 20% of your company, they want assurance that the founders building the company will stick around. Without vesting, a founder could leave immediately after the investment closes and walk away with their full ownership while investors are left with a team gap.
Investor requirements typically include:
- All founders subject to vesting
- Standard 4-year schedule with 1-year cliff
- No single-trigger acceleration (or limited acceleration)
- Vesting continues post-investment
- Clear mechanism for returning unvested shares
Some investors might accelerate a portion of founder vesting at investment as a reward for getting to that stage. For example, they might immediately vest 1 year worth of shares, then continue 3-year vesting from that point.
Expect investors to refuse investment if founder vesting isn't in place or if terms are non-standard without good reason.
Common Objections and Responses
"We all trust each other, we don't need vesting"
Trust is great, but circumstances change. People get sick, have family emergencies, discover the startup life isn't for them, or find other opportunities. Vesting isn't about lack of trust - it's about protecting everyone when unexpected things happen.
"Vesting makes it look like we don't believe in each other"
Professional investors and experienced founders expect vesting. Its presence signals maturity and proper governance. Its absence signals inexperience.
"I'm the one with the idea, I shouldn't have vesting"
Ideas are worth almost nothing - execution is everything. Every founder should be equally committed to execution over 4 years. If your idea is so valuable, negotiate a larger initial ownership percentage, but still subject it to vesting.
"We can add vesting later if we need it"
Adding vesting later is expensive, complicated, and creates tension. It's much harder to convince someone to give up immediate ownership than to structure things correctly from the beginning.
Tax Implications
Vesting can have tax implications depending on how it's structured.
In Ireland, if shares are subject to vesting, there may be tax consequences when shares vest (depending on the structure and whether they were issued at market value).
With reverse vesting, if shares are issued at nominal value, there's typically no tax implication when the company's buyback rights lapse (when shares vest).
However, tax law is complex and situation-specific. Always get tax advice when implementing vesting arrangements, especially if you're adding vesting to shares already issued.
This is another reason to implement vesting at incorporation - tax is simpler when shares are issued with vesting from the start.
Vesting and Leaving the Company
What happens when a founder leaves depends on the circumstances and the terms of your vesting agreement.
Voluntary departure:
If a founder chooses to leave, they typically keep only their vested shares. Unvested shares return to the company. Some agreements distinguish between leaving for a competitor (bad leaver) versus other reasons (good leaver).
Termination for cause:
If a founder is removed for cause (breach of duties, fraud, etc.), they often forfeit even vested shares or can be forced to sell them back at nominal value. Terms vary.
Termination without cause:
If the company terminates a founder without cause, they usually keep their vested shares. Some agreements provide partial acceleration of unvested shares in this scenario.
Death or disability:
Most vesting agreements include provisions for death or permanent disability, often accelerating some or all unvested shares in these tragic circumstances.
The specific terms should be clearly documented in your shareholders' agreement.
How Can Open Forest Help?
Open Forest can help you structure proper founder vesting from day one.
When you incorporate through Open Forest, we:
- Advise on appropriate vesting schedules for your situation
- Prepare shareholders' agreements including vesting terms
- Structure reverse vesting arrangements correctly
- Ensure your setup will satisfy investor requirements
- Connect you with tax advisors for specific advice
Our Future Proof Package (€250) includes a comprehensive shareholders' agreement with vesting provisions specifically designed for startups planning to raise investment.
Getting vesting right from the start avoids expensive legal restructuring later and prevents the founder conflicts that kill companies.
Check out our incorporation packages here - we'll make sure your founder ownership structure protects everyone from day one.

Stuart Connolly is a corporate barrister in Ireland and the UK since 2012.
He spent over a decade at Ireland's top law firms including Arthur Cox & William Fry.












