Equity is the most emotionally loaded conversation in any new Irish partnership. It is also the conversation most founders try to settle in a single dinner — usually the dinner where they first decided to start a company together. That is a mistake, and one that is fully visible in the dispute caseload of every Irish startup-focused solicitor practising today.
This guide is for Irish founders working out how to split equity between two, three or four people. It covers the frameworks that work, the ones that do not, the role of vesting, and the specific Irish legal and tax considerations that change the calculus.
The 50/50 trap
Two co-founders. Equal contribution. Equal commitment. Equal risk. Equal reward. 50/50 feels like the only honest answer.
It is also the equity structure most associated with founder paralysis. 50/50 means there is no tie-breaker. Every disagreement is, in principle, a deadlock. If you are going to use 50/50 — and many strong Irish partnerships do — you must agree, in writing, who has casting vote on what. A 50/50 split with no decision protocol is the corporate equivalent of two pilots and no captain.
50/50 also assumes equal contribution forever. In practice, contributions diverge. One founder works full-time; the other has a day job. One founder brings €30,000 of cash; the other brings none. Two years in, the imbalance becomes resentment, and the resentment becomes a buyout demand.
Forget who had the idea
The single most damaging frame for an Irish founder equity conversation is "I had the idea, so I should have more." Ideas are abundant and almost worthless. What is scarce, valuable and worth equity is execution: the years of unpaid work, the personal financial risk, the customers acquired, the code shipped, the team built.
The split should reflect future contribution, not past contribution. If the idea is genuinely material — a granted patent, a signed customer contract, a working prototype — that is best handled as a discrete IP contribution at incorporation, not as a permanent premium baked into the cap table.
A useful set of inputs
| Input | Why it matters | Typical weighting |
|---|---|---|
| Time commitment | Full-time vs part-time is the single biggest differentiator | High |
| Cash investment | Real money in deserves real equity out | Medium-High |
| Pre-existing IP, brand or customers | Material assets transferred into the company | Medium |
| Personal risk | Leaving a stable salaried role is a real and unrecoverable cost | Medium |
| Role criticality | The technical founder shipping the product carries different risk than the founder selling it | Medium |
| Network and credibility | First customers, first hires, first investors | Low-Medium |
There is no formula that produces a correct answer. The conversation is the thing. Splits arrived at through honest, slightly uncomfortable conversation hold up over years. Splits arrived at through avoidance do not.
Five questions, two minutes, no signup. Surfaces the conversations most Irish co-founders skip — the ones solicitors say cause the majority of disputes.
Run the free check →Vesting: the conversation no one wants to have
Vesting means founders earn their equity over time rather than receiving it all at incorporation. The Irish and international standard is a four-year vest with a one-year cliff: nothing for the first twelve months, then quarterly or monthly accrual until year four.
The reason vesting exists is the founder who leaves at month four with half the company. Without vesting, the remaining founders are committed to building a business in which a meaningful share of the upside belongs permanently to someone who is no longer there. With vesting, the company has a clean mechanism to reclaim the unearned portion.
Vesting is uncomfortable to propose. It can feel like an accusation of disloyalty. It is not. It is the standard practice of every credible startup ecosystem in the world, and any Irish or international investor who looks at your cap table will require it. The conversation is far easier to have at incorporation than at first investment, when it becomes a condition of the cheque.
Founders who refuse to accept vesting at incorporation are statistically more likely to be the founders who leave within twenty-four months. Refusal of vesting is itself a signal worth paying attention to.
The technical-vs-commercial founder dynamic
Many Irish startups are founded by a technical lead and a commercial lead. The temptation to let the technical founder hold more equity "because they are building it" is strong, particularly in the pre-revenue period when product is the only deliverable that exists.
Resist the temptation, or if you yield to it, document the reasoning. The commercial founder's contribution becomes apparent only when revenue arrives, by which time the cap table is fixed. A 60/40 in favour of the technical founder, set at incorporation, can quickly look unfair eighteen months later when the commercial founder has signed the contracts that made the company viable.
Investor dilution: what to expect
Founders who plan to raise external capital should model dilution from day one. Typical Irish venture path:
| Round | Typical dilution | Cumulative founder share (from 100%) |
|---|---|---|
| Pre-seed (€100k–€500k) | 10–20% | 80–90% |
| Seed (€500k–€2m) | 15–25% | 60–75% |
| Series A (€2m–€8m) | 20–25% | 45–60% |
| Options pool (cumulative) | 10–20% | Reduced further |
A founder who starts with 50% and intends to raise meaningful capital should expect to hold somewhere between 12% and 25% by Series A. This is normal and not a failure. It is, however, a useful reality check on the perceived value of the percentage point you are arguing about today.
Irish tax and legal context
Three Irish-specific points are worth knowing.
First, share allocations at incorporation are filed with the CRO and become a matter of public record. Vesting is not visible on the CRO record; it lives in the shareholders agreement. Both must be aligned.
Second, the Revenue treatment of share issuances depends on whether the recipient pays full market value. Issuing shares to a co-founder for nominal value when the company already has demonstrable value can create a benefit-in-kind charge. This is rarely material at true incorporation, but founders bringing in a third partner six months in should take advice.
Third, the Key Employee Engagement Programme (KEEP) and the Employment Investment Incentive (EII) have their own rules around founder shareholding. If you intend to use either, your equity structure should be designed with them in mind from the start.
Twenty questions across equity, exits, IP, decision-making and commitment. A solicitor-grade PDF you can take to your co-founder and your lawyer. Refunded if it surfaces nothing new.
Run the free check →An example
A 2023 Cork-based fintech was founded by an engineer (full-time, no salary), a commercial lead (part-time for the first six months, full-time thereafter) and an industry expert (advisory, ten hours a week). They split 33/33/33 because it felt fair. By month nine, the engineer had shipped two products; the commercial lead had won six paying customers; the industry expert was attending one call a fortnight. The engineer threatened to leave unless the split was renegotiated. There was no vesting, no clear contribution definition and no mechanism for renegotiation. The company recovered, but only after a six-month internal dispute and a buyback of the industry expert's shares at a price all three later felt was wrong.
Mistakes Irish founders make
- Splitting based on past contribution rather than the next four years of work.
- Issuing all shares at incorporation with no vesting schedule.
- Avoiding the conversation because it is awkward, then having it under pressure later.
- Promising equity verbally and forgetting to document it — the verbal promise will be remembered, the documentation will be missing.
- Treating the CRO filing as the equity agreement. It records allocation, not the rationale or vesting.
- Letting one founder commission the shareholders agreement alone.
Conversation prompts
- What is each of us committing — in hours per week, in cash, in pre-existing assets — for each of the next four years?
- If one of us is offered a salaried role at €120k tomorrow, who would take it and what would that mean for the company?
- What is a fair valuation of the IP, customer list or capital each of us is bringing in?
- If one of us leaves at month nine, what should they walk away with?
- How will we revisit the equity split if our roles or commitments change materially?
- Founders who have these conversations explicitly arrive at splits they can defend years later.
- Founders who do not are far more likely to renegotiate equity under pressure within twenty-four months.
- Renegotiation under pressure is the single largest predictor of partnership breakdown in the PartnerReady dataset.
Browse a real, anonymised PartnerReady Report before you spend a cent.
Run the free check →Frequently asked questions
- Is a 50/50 equity split a bad idea in Ireland?
- Not inherently. A 50/50 split between two equally committed founders can work — but only if it is paired with a written decision-making protocol, a casting-vote mechanism, and a vesting schedule. 50/50 with no tie-breaker is a structural risk.
- What is a typical vesting schedule for Irish co-founders?
- Four-year vesting with a one-year cliff: nothing in the first twelve months, then monthly or quarterly accrual to year four. This is the international and increasingly Irish norm.
- Can we change the equity split later?
- Yes, but it is hard. Once shares are issued and filed at the CRO, changing the split requires unanimous founder agreement, possible Revenue implications, and updated CRO filings. Get it right at incorporation.
- Should the founder with the idea get more equity?
- Usually no. Ideas are abundant; execution is scarce. Equity should reflect future contribution. If the idea is materially valuable — a patent, a customer contract, a working prototype — handle it as a discrete IP contribution rather than a permanent equity premium.
- How does dilution work in Ireland?
- Each external investment round dilutes founders proportionally. A founder starting at 50% and raising through pre-seed, seed and Series A typically ends up holding 12–25% of the company. This is normal and expected.
Most disputes begin long before the first legal disagreement.
Free Lite Check · €49 for the full PartnerReady Report · Refunded if it surfaces nothing new.
Start the Partnership Risk Check →