Can you be dismissed while on sick leave? What the law says

Yes, you can be dismissed while off sick. Being signed off does not make your job untouchable. But it is not simple, it is not quick, and employers who treat a fit note as an inconvenience to be managed away tend to find out at tribunal just how many rules they broke.

There are two completely different situations, and it is worth being clear which one you are in.

Situation one: dismissed because you are sick right now

If your employer dismisses you simply for taking sick leave, particularly short, certified absence, that is very hard for them to defend. You are entitled to take sick leave when you are unfit, to receive statutory sick pay from day one, and not to be punished for exercising that right.

Dismissals in this territory are frequently:

• Automatically unfair if the real reason is a protected reason, for example pregnancy-related illness or asserting a statutory right
• Disability discrimination if your condition is a disability and the dismissal is because of the absence it causes
• Ordinary unfair dismissal if there is no fair reason and no fair process

Situation two: capability dismissal after long-term absence

The legitimate route is dismissal on grounds of capability: your health means you cannot do your job, and that position is not going to change soon enough. This can be fair. But a fair capability dismissal has ingredients, and missing any of them makes the dismissal vulnerable: While that process runs, your pay position is covered in our long-term sick pay guide.

• Genuine consultation with you. Meetings where your view of your condition and prognosis is actually sought, not a letter telling you a decision has been made.
• Up-to-date medical evidence. Usually an occupational health report or a report from your GP or specialist, obtained with your consent. Dismissing on stale or absent medical evidence is one of the most common tribunal losers.
• A real look at adjustments. Reduced hours, altered duties, redeployment, equipment, homeworking. If your condition is a disability under the Equality Act 2010, reasonable adjustments are a legal duty, not a favour.
• A sensible timescale. How long is reasonable depends on the size of the employer, how long you have been off, the medical prognosis and how easily your role can be covered.
• A proper process and an appeal. The same procedural fairness as any disciplinary process: notice, a hearing, the right to be accompanied, and an appeal.

If your condition is a disability

This changes everything. A physical or mental impairment with a substantial, long-term effect on normal day-to-day activities is a disability under the Equality Act 2010, and that covers far more conditions than people expect, including depression, anxiety, cancer, MS and many chronic conditions. Our disability discrimination guide explains what counts and the protection it gives you.

If you are disabled:

• The employer must make reasonable adjustments, which can include extending sick pay, discounting disability-related absence from absence triggers, and adjusting duties.
• Section 15 protects you from being treated unfavourably because of something arising from your disability, including absence itself, unless the employer can justify it as a proportionate means to a legitimate aim, which is a demanding test.
• No qualifying period applies. Discrimination claims do not require two years, or six months, of service. They are available from day one of employment.

Service length and unfair dismissal

For ordinary unfair dismissal you currently need two years' service, but that drops to six months on 1 January 2027 under the Employment Rights Act 2025, as we explain in our qualifying period guide. Disability discrimination, automatic unfairness and unlawful deduction claims need no qualifying service at all.

What to do if it happens to you

• Do not resign. A dismissal gives you claims; a resignation usually gives you a harder constructive dismissal case.
• Appeal, even if it feels pointless. It keeps the ACAS uplift argument alive.
• Gather the paper trail: fit notes, occupational health correspondence, absence records, meeting notes.
• Start ACAS early conciliation within three months of the dismissal (six months from October 2026). Our guide to ACAS early conciliation explains the step, and tribunal time limits covers the deadlines.

Being dismissed while ill feels like the system failing you. Often it is, and often it is also unlawful. A specialist employment solicitor can tell you within one conversation which of those your case is.