Can My Employer Dismiss Me While I Am on Sick Leave?

The short answer

Yes, your employer can dismiss you while you are on sick leave. Sickness absence is not a protected shield that stops a dismissal from happening. Employers are allowed to end an employment relationship where someone can no longer do the job they were hired to do, or where the absence has reached a point the business genuinely cannot sustain. In employment law this is usually called a capability dismissal.

That is the uncomfortable part. Here is the part that protects you: they can only do it if they follow a fair procedure, and most employers who dismiss someone on sick leave get that procedure wrong. The law looks very closely at what your employer did before they made the decision, not just at the decision itself. A dismissal that might have been fair becomes unfair if the steps leading up to it were rushed, one-sided, or based on guesswork about your health.

What a fair procedure looks like

A fair dismissal on health grounds is never a single letter out of nowhere. Your employer is expected to have held absence review meetings with you, to have explained clearly that your job was at risk, to have told you what they were relying on, and to have given you a genuine chance to respond before anything was decided. You should have been invited to those meetings in writing, and you should have been allowed to be accompanied at any formal meeting by a fellow worker or a trade union official.

If several of those steps are missing from what happened to you, write that down now while it is fresh. Those gaps are often the strongest part of a claim.

Up-to-date medical evidence

Your employer cannot dismiss you on the basis of an assumption about your health. Before making a decision they are expected to obtain up-to-date medical evidence about your condition, how it affects your ability to do your job, and when you are realistically likely to be able to return. In practice that usually means a referral to occupational health, or a report from your GP or treating specialist with your consent.

Evidence that is months old, or a report the employer never actually asked for, is a common weakness. So is an employer who receives a report saying you are likely to return in a few weeks and dismisses you anyway. You are entitled to see the medical evidence being used to decide your future, and to comment on it if you think it is wrong or incomplete.

Reasonable adjustments and disability

If your condition counts as a disability under the Equality Act 2010, your employer has a further and stronger duty. Under that Act, a disability is a physical or mental impairment that has 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 twelve months. Many conditions people do not think of as disabilities, including depression, anxiety, long COVID, diabetes and chronic pain conditions, can meet that definition.

Where the definition is met, your employer must consider reasonable adjustments before they consider dismissal. That can mean a phased return, reduced or altered hours, a change of duties, working from home, redeploying you into a different suitable role, adjusting absence triggers so your disability-related absence is treated differently, or simply allowing more time before any decision is taken.

They must consult you first

Consultation is not a formality and it is not the same as informing you. Your employer must speak to you before any decision is made, ask how you are, ask what would help you get back, and genuinely take your answers into account. If the first you heard about your dismissal was the dismissal itself, or if the meeting felt like a script being read out because the decision was already taken, that is a procedural failure and it matters. Being too unwell to attend a meeting in person does not remove your right to be consulted. Your employer should offer alternatives such as a phone call, a video call, a home visit, written submissions, or a short postponement.

When dismissal is automatically unfair

Some dismissals are unlawful no matter what process was followed. Dismissal because of pregnancy, a pregnancy-related illness, or because you are on or have taken maternity leave is automatically unfair, and there is no qualifying period of service for that protection. If you are off sick with a pregnancy-related condition and your employer is counting that absence against you, that is also likely to be discrimination.

The same principle applies if the real reason for the dismissal is that you raised a grievance, reported wrongdoing, asserted a statutory right, or took part in protected activity. Sickness absence is sometimes used as a convenient cover story for a decision that was really made for another reason. If the timing looks suspicious to you, it will look suspicious to a tribunal too.

The qualifying period changes in January 2027

Ordinary unfair dismissal protection currently depends on length of service. From January 2027, under the Employment Rights Act 2025, the qualifying period for unfair dismissal protection drops from two years to six months. That is a significant shift, and it means many employees who would previously have had no claim at all will be protected. Automatically unfair reasons, and discrimination claims under the Equality Act 2010, do not require any qualifying service either now or after the change. If you are unsure where you stand, count your continuous service from your actual start date and note it down, because that single date often decides which route is open to you.

What to do if a dismissal letter arrives while you are off sick

First, do not resign. Resigning in anger or distress usually removes the very claim you would otherwise have, and it can affect what you are paid. Whatever else you do, stay employed until you have taken advice.

1. Appeal the decision in writing, within the deadline stated in your letter. Even a short appeal that says you disagree and will provide fuller grounds protects your position.
2. Gather your medical evidence. Fit notes, GP letters, occupational health reports, hospital appointment letters and prescriptions all help show what your employer knew and when.
3. Keep copies of everything. Emails, letters, meeting invitations, notes, absence records and messages. Save them somewhere outside your work account before your access is switched off.
4. Note the time limits. Acas states that time limits for employment tribunal claims increased from 3 months to 6 months on 1 October 2026. The 3 month limit may still apply to problems that started before 1 October 2026. Check your deadline early and seek advice. You must start Acas early conciliation first.
5. Seek specialist advice early, while you can still influence the outcome, rather than after the deadline has passed.

If you are too unwell to do all of this yourself, say so in writing and ask for more time. A request for a reasonable extension because of illness is difficult for an employer to refuse, and refusing it becomes part of the picture.

Put everything in writing

Conversations disappear. Documents do not. From this point on, follow up every phone call and every meeting with a short email that says what was discussed and what was agreed. You do not need to be confrontational. Something as simple as "Thank you for the call today, my understanding is that you will refer me to occupational health this week" creates a record that is very hard to argue with later.

Alongside that, keep a timeline. One line per event, with the date: when you went off sick, when each fit note was submitted, when your employer contacted you, when meetings happened and who was there, when medical evidence was requested, and when decisions were communicated. A clear timeline is the single most useful thing you can bring to an adviser, and it turns a distressing blur of events into something you can act on.