Promising a new hire a percentage of the company sounds straightforward. The difficult questions arrive later: a percentage of which share count, when does it vest, what must the employee pay, and will a tax bill arise before there is any opportunity to sell?
An employee stock option plan needs answers that work for the company and the people receiving the awards. In Europe, that requires coordinating the commercial terms with national company, employment and tax rules, especially when the team works across borders.
A document copied from another startup may use familiar language while creating very different outcomes. This guide explains how options work, which terms require deliberate choices, and how to establish a plan that remains understandable through hiring, fundraising, employee departures and a possible exit.
What is an employee stock option plan?
An employee stock option plan gives eligible participants a contractual right to acquire a defined number of shares at an agreed exercise price, subject to the plan's conditions. Granting an option usually does not make the recipient a shareholder immediately. The shares are acquired when the option is validly exercised and the required corporate steps are completed.
Four events should be distinguished. Grant creates the award. Vesting determines when the contractual entitlement is earned. Exercise involves using the option to acquire shares. A sale creates liquidity if a buyer and permitted sale mechanism exist. These events can occur years apart.
Terminology also matters. In European startup discussions, ESOP commonly refers to an option or equity incentive arrangement. It should not be confused with the specific US employee stock ownership plan model.
Before discussing a percentage, define the actual instrument. Direct shares provide ownership; options provide a future acquisition right; phantom equity typically provides a contractual cash entitlement linked to value. Their voting, dilution, tax and funding consequences differ. An offer letter should describe what the employee is receiving in language consistent with the legal documents, rather than relying on the word equity to explain everything.
How does vesting work for startup ESOPs?
Vesting connects entitlement to continued service, performance or another defined condition. A four-year service schedule with a one-year cliff is a familiar example, but it is a commercial design choice, not a general EU legal requirement.
Consider an illustrative grant of 4,800 options. Under a four-year schedule with 25% vesting after the first year and the remainder monthly, 1,200 options vest at month 12 and 100 each month thereafter. At month 18, 1,800 have vested, assuming continuous eligible service and no other conditions. Vesting alone does not mean that the employee has acquired or sold shares.
Set the commencement date, treatment of leave, performance assessment and any acceleration explicitly. Acceleration may depend on an acquisition alone or on both an acquisition and a subsequent qualifying employment event. The agreement must define the chosen triggers.
An employee stock option plan also needs departure rules. Explain what happens to unvested awards, how long vested options remain exercisable, and how different leaving circumstances are treated. Have local counsel assess enforceability. A short exercise window can require an employee to fund the purchase and possibly tax while the shares remain illiquid; that consequence should be understood before the award is accepted.
How does the law apply to an EU option plan?
There is no single national template that can safely be applied to every EU team. Start with the issuing company's jurisdiction and legal form, then map where participants live, work and are employed. Corporate authority to deliver shares is a separate question from each employee's tax treatment.
Review the articles, shareholder agreement and applicable company law for approval requirements, share issuance or transfer mechanics and relevant shareholder rights. Plan documents should fit those arrangements rather than promise shares the company cannot deliver through the proposed process.
Where securities-offering rules apply, examine the relevant exemption. Article 1(4)(i) of the Prospectus Regulation provides an employee-related exemption subject to an information-document requirement. This is not a blanket exemption from company law, tax, employment obligations or all disclosure requirements.
As of 8 September 2026, the Commission presents EU Inc. and its common employee stock-option scheme as a proposal. Proposed harmonised deferred taxation should not be treated as an available benefit for a current grant. Check the legislative position and applicable national rules when implementing the plan.
Legal expert insight
“With a cross-border ESOP, there are usually two legal workstreams running at the same time. The company’s jurisdiction determines whether and how the shares can actually be issued or transferred, which approvals are required and how the plan needs to fit the company’s existing corporate structure.
The employee’s location creates a separate set of questions: when tax may arise, whether payroll or withholding obligations apply, and what changes if the employee works or moves across jurisdictions.
A plan can therefore work perfectly well from the issuing company’s corporate-law perspective and still create an unexpected tax or employment issue for the participant. Those workstreams need to be assessed separately and brought together before the grant is made — not after the employee decides to exercise.” Peter Merc, founder of Lemur Legal
How do ESOP structures differ across EU jurisdictions?
The relevant comparison is the treatment of the intended instrument for the actual company and participant. A country with an attractive headline regime may still be unsuitable if the company, share class or employee does not meet its conditions.
Ireland's Key Employee Engagement Programme guidance illustrates a conditional tax-favoured option regime. Qualifying exercises receive relief from specified employment taxes, while a later disposal may create capital-gains liability. Qualification depends on the options, employee and company. An ordinary option grant should not be assumed to receive KEEP treatment.
Estonia's Tax and Customs Board guidance shows the importance of documented grant terms and timing. It identifies the exercise price, underlying shares and grant date as material, with a period of at least three years relevant for tax purposes. Early events and documentation requirements need separate review; a vesting schedule alone does not settle the tax result.
For a Slovenian issuer, start with its legal form, the proposed method of delivering equity and each participant's circumstances. Do not import either example as a Slovenian rule. Lemur Legal's incorporation and ESOP work connects the corporate design with the local advice needed to implement it.
How should you size the pool and explain dilution?
Build the pool around a hiring plan rather than a percentage copied from another company. Identify expected roles, likely award sizes, existing promises and the period before the next financing. Then model how the proposed reserve affects the founders, investors and employees.
An employee stock option plan should describe awards in a defined number of options, with any percentage explanation tied to a dated and clearly specified denominator. Issued shares, fully diluted capital and post-financing capital are different measurements.
For example, 10,000 options represent 1% of an assumed 1,000,000-share fully diluted total. If that total later becomes 1,250,000 through new issuance, the same award represents 0.8%, assuming no adjustment rights or other changes. The option count has stayed the same; the ownership percentage has changed.
Agree how new financing, pool increases, share splits and reorganisations affect awards. Investors may negotiate a pre-investment pool top-up, which can shift dilution onto existing holders. Explain these mechanics before a term sheet fixes expectations. Also distinguish headline valuation from employee proceeds: exercise cost, tax and the rights attached to different share classes can materially affect what an employee ultimately receives.
What should employees understand before accepting options?
Provide a plain-language explanation alongside the legal terms. The employee should understand the exercise price, vesting conditions, expiry date, departure rules and whether exercise is possible before an exit. They should also know which share class they would receive and what rights or restrictions accompany it.
An employee stock option plan is not a promise that the award will become valuable or liquid. A rising company valuation does not create a buyer for the employee's shares. Transfer restrictions and investor preferences may affect whether, when and how much the employee receives on a sale.
Tax requires particular care. Depending on the jurisdiction and instrument, liabilities may arise at different stages, including before sale proceeds exist. Obtain a jurisdiction-specific assessment and identify employer reporting or withholding responsibilities. A participant moving countries should trigger a fresh review rather than an assumption that the original treatment continues unchanged.
Use illustrative scenarios covering no exit, a departure before full vesting and a possible sale. State assumptions explicitly and avoid presenting potential proceeds as guaranteed compensation. Give employees time to ask questions and seek their own advice. A retention arrangement is more credible when participants understand both its opportunity and its limitations.
Put the plan into operation before making promises
Implement the employee stock option plan through the required approvals, consistent plan rules, individual grant agreements, a reliable award register and coordination with payroll and tax advisers. Reconcile grants with the cap table and keep a process for departures, exercises and cross-border moves.
The right structure depends on the company's legal form, financing plans and workforce. It cannot be selected by looking at vesting alone, and a generic template cannot establish eligibility for a national tax benefit.
Lemur Legal can help founders organise the corporate and contractual work and identify where specialist local tax input is required. A workable plan makes the promise precise: what employees can earn, how they can acquire it, and what happens as the company changes.