Can My Employer Sack Me While I'm Off Sick With a Fit Note?
A fit note protects your pay. It does not, on its own, make you immune from dismissal. Here is what actually protects you.
← Back to Blog · Employment · Published 8 September 2026 · Directed and published by Matt Thompson, founder of UK Work Rights
This is free rights guidance, not legal advice. Every statutory figure here is checked against a primary source — see our Editorial & Verification Policy.
The short answer
Yes, an employer can lawfully dismiss someone who is off sick, even with a valid fit note. This is one of the most common and most damaging misunderstandings in UK employment. People stay off believing the fit note is a shield, and are shocked when a dismissal letter arrives.
But "can" is not "easily". A dismissal for sickness absence is a capability dismissal, and it is only fair if the employer follows a proper process. Most employers who get this wrong lose, not because they dismissed, but because of how they did it.
What a fit note actually does
A fit note (properly, a Statement of Fitness for Work) does two things. It is medical evidence that you are unfit for work, which is what entitles you to Statutory Sick Pay and protects you from being treated as absent without leave. And it can recommend adjustments — reduced hours, amended duties, a phased return.
What it does not do is freeze your employment. There is no rule anywhere in UK law that says an employee holding a current fit note cannot be dismissed.
Capability dismissal: the process that has to happen
For a sickness dismissal to be fair, an employer generally has to show it acted reasonably. In practice that means:
- Consultation with you. Meetings where your situation is discussed and you get to respond — not a decision made in your absence.
- Getting medical evidence. Usually an occupational health report or a request to your GP, with your consent. Dismissing on assumptions about your health, without evidence, is a common employer error.
- Considering alternatives. Adjusted duties, a phased return, redeployment to another role.
- Considering the likely return date. An employer is expected to weigh whether you are likely to return within a reasonable period.
- A right of appeal.
Skipping these is where employers lose. A rushed dismissal with no occupational health input and no consultation is very different from a documented process over months.
The part that changes everything: is your condition a disability?
This is the single most important question and the one people miss. If your condition counts as a disability under the Equality Act 2010, you gain a separate and much stronger set of protections that sit on top of unfair dismissal law.
The legal test is broader than most people assume. A condition qualifies if it is a physical or mental impairment with a substantial and long-term adverse effect on your ability to carry out normal day-to-day activities. "Long-term" generally means it has lasted, or is likely to last, at least 12 months. Depression, anxiety, long COVID, diabetes, arthritis and back conditions can all qualify depending on their effect.
If it does qualify, your employer has a legal duty to make reasonable adjustments. Dismissing you without having made them is a serious problem for the employer, and a discrimination claim does not depend on how long you have worked there.
Time limits — and the change coming on 1 October 2026
This matters more than almost anything else in this article, because missing the deadline ends the claim regardless of merit.
Currently the limit is 3 months less 1 day from the dismissal. From 1 October 2026 it becomes 6 months less 1 day. Which applies to you depends on the date of the act you are complaining about, not the date you find out about it or the date you decide to act.
You must notify ACAS and go through Early Conciliation before you can lodge a tribunal claim. That process can now run up to 12 weeks. Notifying ACAS pauses the clock, which is exactly why you should contact them early rather than waiting to see whether things resolve.
Confirm your own deadline with ACAS on 0300 123 1100. Do not rely on a date you calculated yourself, and do not rely on one calculated by us or by any AI tool.
What to do now
- Keep every fit note and a copy of anything you send your employer.
- Put adjustment requests in writing. A verbal request is much harder to evidence later.
- Ask for occupational health if your employer has not arranged it. It creates the medical record a fair process needs.
- Attend the meetings if you are well enough, or ask for them to be rescheduled or held in writing. Refusing to engage at all rarely helps.
- Contact ACAS early if dismissal looks likely.
Check your own situation free
Every situation turns on its own facts. These free tools use the same verified figures as this article: