Alex is Sprintlaw's co-founder and principal lawyer. Alex previously worked at a top-tier firm as a lawyer specialising in technology and media contracts, and founded a digital agency which he sold in 2015.
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When a valued team member is absent from work due to long-term illness, it can be an incredibly challenging situation for both you and your business. Not only do you want to treat your staff fairly and with compassion, but you’re also responsible for keeping your business running smoothly.
At some point, you might find yourself wondering: how long can you be on sick leave before dismissal? Or perhaps you’re concerned about risks if you get the process wrong. Don’t stress – with the right information and approach, you can confidently navigate dismissal processes relating to long-term sick leave and avoid costly mistakes.
In this guide, we’ll break down when dismissal may be appropriate, what UK law requires, the steps to follow for a fair process, and what legal pitfalls to avoid. We’ll also answer some of the most common employer questions and point you to tailored legal support if you need it.
When Can You Dismiss an Employee on Long-Term Sick Leave?
Let’s start with the basics: it is possible to dismiss someone on long-term sick leave, but there are strict rules and fair procedures you have to follow. Your decision needs to be supported by solid evidence and genuine reasons - not just business convenience or cost concerns.
Generally, dismissal will only be an option when:
- You have medical evidence confirming that the employee cannot return to their role (now or in the foreseeable future), or
- Even with reasonable adjustments, they remain incapable of carrying out the job requirements
Rushing into dismissal without proper investigation or consideration, especially if the absence relates to a disability, is a recipe for legal trouble. It’s about balancing the welfare of your employee against the needs of your business - a sensitive line that UK employment law is designed to protect.
If you’re dealing with recurring absences or an employee who’s repeatedly off sick for short periods, there are different rules and processes to consider. For more on performance management or potential alternatives, check out our article on legal aspects of performance management.
What Are The Legal Protections for Employees on Sick Leave?
Employment law in the UK offers strong protections to employees, especially if they’ve been with you for two years or more, and/or their absence is related to a disability.
Unfair Dismissal Rights
After two years of service, employees gain unfair dismissal protection. This means any dismissal (even during sick leave) must be for a fair reason and carried out with a fair procedure.
Fair reasons include:
- Capability to do the job (including ill-health)
- Conduct
- Redundancy
- Some other substantial reason
- Legal restriction (e.g. no longer holding necessary work permits)
A dismissal for long-term sick leave must be genuinely about capability - never because you simply want to avoid paying sick pay or because the employee is inconvenient to your rota. If you do not follow fair procedures, you risk claims in an employment tribunal for unfair dismissal (potentially resulting in substantial compensation payments).
Explore our simple explanation of what happens if a contract is broken for a wider context on your legal obligations in employment contracts.
Discrimination and Disability Protections
All employees are also protected under the Equality Act 2010. This law makes it illegal to discriminate directly or indirectly against someone because of a disability - and many long-term health conditions, both physical and mental, qualify as disabilities.
If the dismissal is related (even in part) to someone’s disability, you could face a discrimination claim regardless of their length of service. These claims can lead to uncapped compensation and serious reputational risk.
You must make reasonable adjustments to help disabled employees stay in or return to work (such as changing duties, hours, workflow, or offering alternative roles if available). Skipping this step could be viewed as discriminatory.
For guidance on disability law and supporting workers, see our article on harassment and discrimination in the workplace.
How Long Can Someone Be on Sick Leave Before Dismissal?
One of the most frequent questions from business owners is: how long can you be on sick leave before dismissal?
There isn’t a hard-and-fast legal limit. UK law does not specify a set period after which dismissal is automatically justified. Instead, the answer depends on the individual facts, the medical evidence, and whether all fair process steps have been followed.
Some companies use policy benchmarks (such as 6 or 12 months), but you still must judge each case on its merits. Tribunals will expect to see:
- Frequent and open communication with the employee
- Medical assessments and up-to-date information (usually from an independent or Occupational Health specialist)
- Consideration of all reasonable adjustments or alternatives
- Warnings and formal reviews before any dismissal decision
In short, do not base dismissal purely on the length of absence. Always ensure there is medical and procedural justification for your actions.
What Procedure Should Employers Follow Before Dismissing on Sick Leave?
Getting the process right is crucial - it’s what protects your business from unfair dismissal or discrimination claims. Here’s a step-by-step guide on what you should do:
1. Collect Medical Evidence
Don’t guess about an employee’s health. Request medical opinions (usually from their GP and/or Occupational Health) on:
- The nature of the illness
- Likely timescale for recovery
- Whether the employee could return with adjustments
- Whether there’s a disability under the Equality Act 2010
2. Consult With the Employee
Always keep your employee in the loop. Discuss their health, prospects of return, and options for:
- Reasonable adjustments in their current job
- Temporary or permanent alternative roles
- Flexible working or changes to duties
- Support they may need for a phased return
Record these meetings, and share minutes or summaries so everyone’s clear on what was discussed.
3. Explore All Reasonable Adjustments and Alternatives
Before considering dismissal, you must explore (and document) all reasonable alternatives. This includes considering flexible hours, changing job duties, or even transferring to a different suitable role within your organisation.
You don’t have to create a new job or compromise business needs, but you must show you tried. Not doing so can be discriminatory if the employee is disabled.
4. Give Fair Warning and Opportunity to Respond
Before any final decision, write to the employee explaining that dismissal is under consideration, the reasons why, and invite them (and a companion, such as a union rep) to a formal meeting. Let them present evidence, ask questions, or suggest alternatives.
5. Make a Reasoned and Documented Decision
Once you’ve gathered evidence and listened to the employee, you should decide and confirm it in writing. If you’re dismissing, explain:
- The precise reasons (supported by medical evidence and process history)
- Any alternative roles or adjustments considered and why they were not possible
- The right to appeal (which must always be offered)
For more on handling the end of contracts, visit our guide to end of a contract.
6. Settle All Final Payments and Entitlements
Employees dismissed while on sick leave are entitled to:
- Any accrued but untaken holiday pay
- Notice pay or pay in lieu of notice, according to contract
- Statutory or enhanced sick pay due
Be sure you understand your obligations under each employee’s contract and the statutory rules for holiday entitlement.
What Legal Risks Do Employers Face If the Process Isn’t Followed?
Getting a long-term sick leave dismissal wrong can spell serious trouble for your business. The main risks include:
- Unfair dismissal claims: Employees with two years’ service (or more) can bring a claim if they feel the dismissal wasn’t for a fair reason or the process was unfair.
- Disability discrimination claims: Dismissing (or failing to make adjustments for) a disabled employee can lead to a discrimination claim, with uncapped compensation and reputational harm.
- Breach of contract: If you haven’t paid correct notice, holiday pay, or followed terms in the contract.
- General morale: Mishandling sickness dismissals is not only a legal risk – it can seriously damage staff morale and your reputation as a fair employer.
If you’re worried about any of these risks, it’s a smart idea to speak to a legal expert. Our employment contract review service can help ensure your agreements and policies are watertight, and our guide to navigating termination of employment provides practical tips for difficult cases.
Frequently Asked Questions About Dismissing Staff on Long-Term Sick Leave
Here are some of the most common questions we receive about long-term sick leave dismissals.
Can You Dismiss Someone While They’re Off Sick?
Yes, but only if it’s a fair dismissal with proper evidence, after following a fair process (medical evidence, consultation, reasonable adjustments). Dismissing someone because they’re “inconvenient” or before exploring alternatives is likely to be found unfair or discriminatory.
Is There a Maximum Length of Sick Leave Before You Can Dismiss?
No set maximum exists. It’s about whether the person can realistically return and when, and whether you have fairly considered all alternatives. Each absence and person must be assessed individually.
What If the Employee’s Sickness Is Caused by Work?
You must be especially careful if the illness is linked to work (such as workplace injury or stress). Special procedures and extra scrutiny are likely to apply. Consider professional legal advice if this is the case. You may also be required to make additional adjustments or support under health and safety law – see our Health & Safety in the Workplace guide for more.
What Are ‘Reasonable Adjustments’ in Practice?
Reasonable adjustments could include:
- Flexible hours or remote working
- Changes to work duties
- Physical adaptations (equipment, furniture, IT access)
- Offering alternative roles where available
You’re not expected to make changes that would impose unreasonable cost or disruption, but you must be able to show you’ve considered each practical option.
Do Employees Still Get Redundancy Rights If You Dismiss Because of Illness?
Dismissal for capability (health) is different from redundancy. Unless there is a genuine redundancy situation (the job no longer exists), the dismissal is for capability. However, dismissal for long-term sick leave must still follow fair process, even if you select redundancy by reason of incapacity.
Key Takeaways
- You can dismiss an employee on long-term sick leave, but only if it’s clear they can’t return and you’ve followed a fair, thorough process based on medical evidence.
- There is no set time limit after which dismissal is automatically justified - each case must be considered individually.
- Always consult the employee, seek medical evidence, and exhaust all reasonable adjustment or redeployment options first.
- Failure to follow fair processes can trigger claims for unfair dismissal or disability discrimination, with significant financial and reputational consequences.
- Legal risks multiply if the sickness is related to a workplace injury, mental health, or disability - so extra care is essential.
- Get legal advice for dismissal decisions - a well-handled process now can save costly tribunal claims later.
If you need help navigating sick leave dismissal, updating your employee policies, or defending an employment claim, our friendly legal experts are here to help you every step of the way. You can reach us at 08081347754 or team@sprintlaw.co.uk for a free, no-obligation chat about your situation.
