EMI share options and disqualifying events: what UK employees need to watch for

Why disqualifying events matter more than the tax rates themselves

Most explainers on Enterprise Management Incentive (EMI) options focus on the headline tax treatment: no income tax or National Insurance on grant, and Capital Gains Tax rather than income tax when shares are eventually sold, provided the option is exercised within its life and certain conditions are met. Less understood is what happens when something changes at the company or with the employee, and the option stops qualifying for that treatment part-way through its life. This is called a disqualifying event, and it can catch employees out even when they’ve done nothing wrong themselves.

Understanding disqualifying events matters because EMI’s tax advantage is conditional, not automatic. The scheme is generous precisely because HMRC attaches strict ongoing requirements to it, and those requirements apply for as long as the option is held, not just at the moment it is granted.

What counts as a disqualifying event

A disqualifying event is any change of circumstance that means the option no longer meets EMI’s qualifying conditions. Common triggers include:

• The company ceasing to meet the independence or gross assets requirements, for example after being acquired or restructured
• The company’s trade changing so it no longer qualifies as a genuine trading activity under the scheme rules
• The employee ceasing to work the minimum required hours for the company, or leaving employment altogether (leaving employment is treated differently from other disqualifying events but still starts a clock)
• A variation to the terms of the option that is not a permitted adjustment
• The company granting options that breach the individual or overall limits set for EMI schemes

Because the rules are detailed and do change, employees and founders should not rely on memory or assumption about what triggers a disqualifying event. The current conditions are set out by HMRC and should always be checked against the live guidance rather than an older summary.

The exercise window that follows

When a disqualifying event occurs, the employee does not automatically lose all tax benefit. Instead, a limited period opens during which the option can still be exercised while retaining the favourable EMI tax treatment built up to that point. If the option is exercised within that window, the growth in value up to the disqualifying event is generally still eligible for the EMI-friendly Capital Gains Tax treatment; growth after that point may not be.

If the employee exercises after the window has closed, the tax position is materially worse. Rather than the gain being taxed only as a capital gain on sale, part or all of the value may instead be taxed as employment income, meaning Income Tax and National Insurance become relevant in a way they would not have been under the original EMI treatment. This is the practical risk: a missed deadline can turn what should have been a capital gain into an income tax bill, sometimes without the employee having sold any shares yet to fund it.

Why this catches employees off guard

Employees often only think about their options at two moments: when they are granted, and when the company is sold. Disqualifying events can happen in between, sometimes for reasons entirely outside the employee’s control, such as a corporate restructuring, a change in investor control, or the company diversifying into a new line of business. An employee may not even be told promptly that a disqualifying event has happened, because the notification obligation sits with the company, not the individual.

This is why founders running EMI schemes have a practical responsibility to monitor for disqualifying events and tell affected employees quickly, and why employees holding EMI options should ask, particularly around any company restructuring, acquisition, or change of business activity, whether a disqualifying event has been triggered and when the exercise window closes.

Leaving employment is a special case

Ceasing to be an employee is treated as its own category of disqualifying event, with its own timing rules for how long favourable treatment can be preserved after departure. Good leaver and bad leaver provisions in the company’s own option agreement sit alongside this tax rule and are a separate, contractual matter, not a tax one. An employee leaving a business should check both: what their contract says about whether they can exercise at all, and what the tax rules say about the window for doing so with EMI treatment intact.

What to actually do

Employees holding EMI options should keep their grant documentation, note the option’s expiry date, and treat any word of a company sale, restructuring, or change of business as a prompt to ask specifically about disqualifying events, not just about the deal itself. Because EMI’s qualifying conditions, exercise windows and tax treatment are set out in detailed, occasionally updated HMRC guidance, employees and founders should confirm the current position directly with HMRC’s Employment Related Securities guidance or through a qualified adviser rather than relying on a general explanation, especially once a specific transaction or departure is on the table.

The underlying lesson is simple: EMI’s tax advantage is not a one-off award fixed at grant. It is a status that has to be maintained, and employees who understand disqualifying events are far better placed to protect the value they’ve actually earned.