Can you be fired while on sick leave in the UK?

The short answer

Being on sick leave does not give you immunity from dismissal. UK employers can dismiss employees who are off sick — but they have to clear two bars:

1. A fair reason. For sickness this is usually "capability" (one of the five potentially fair reasons under section 98 Employment Rights Act 1996).
2. A fair process. This means up-to-date medical evidence, genuine consultation with the employee, exploring reasonable adjustments, and (where relevant) considering redeployment.

Skip either bar and the dismissal becomes unfair.

What "fair process" actually requires

When someone is off long-term, a reasonable employer will:

• Obtain an occupational health report that addresses likely return-to-work date, capacity for current duties, and possible adjustments
• Hold a welfare meeting with the employee (often more than one) before any formal capability process
• Properly consider reasonable adjustments if the condition could amount to a disability under the Equality Act 2010
• Look at alternative roles or modified duties
• Only after all of that, hold a capability hearing where dismissal is on the table — with a right of appeal

Dismissal based on a stale OH report, no real consultation, or "we already know what they'll say" is almost always unfair. We've seen exactly that pattern in tribunal cases.

Disability discrimination — the second risk for employers

If your condition is long-term (usually 12 months or more) and has a substantial adverse effect on your day-to-day life, it likely amounts to a disability under section 6 Equality Act 2010. That triggers additional protections:

• The employer has a duty to make reasonable adjustments
• "Discrimination arising from disability" (section 15) — being treated unfavourably because of something arising from the disability (like sickness absence itself)
• Sickness absence cannot be used as a trigger under absence policies in the same way it can for a non-disabled employee, without considering adjustments

In practice, sickness dismissals often generate parallel unfair dismissal and disability discrimination claims.

When sickness dismissals are more likely to be fair

• The employee has had a fresh OH report that genuinely supports no foreseeable return
• The employer has held multiple welfare meetings over a reasonable period
• Adjustments and alternatives have been considered and ruled out for documented reasons
• The employee has been kept informed and given a right of appeal

When they're more likely to be unfair

• Decision rushed (no real time given to recover)
• Medical evidence is months out of date
• The employee asked for further OH and was refused
• No discussion of adjustments
• Pre-judged decision dressed up as a process

See real cases

• Dismissed during long-term sick leave — capability dismissal that went too fast

Disclaimer

This page is general legal information, not legal advice. Your situation depends on your specific facts. For advice, speak to ACAS (free), a CAB, a trade union, or an employment solicitor.