Long-Term Sick Leave Dismissals: Legal Ground Rules

Short answer: you can dismiss someone on long-term sick leave in the UK, but only where dismissal is reasonable, supported by current medical evidence and handled through a fair process. There's no fixed number of weeks or months that makes dismissal automatically fair.

For most employers, the safest way to think about long-term sickness dismissal is this: it should be the last realistic option after you have consulted the employee, considered reasonable adjustments, explored alternatives and given the employee a proper chance to respond.

When Can You Dismiss An Employee On Long-Term Sick Leave?

Dismissal during long-term sick leave can be legally possible where the employee is no longer capable of doing their job and there's no reasonable adjustment or alternative role that would allow employment to continue. In employment law, this is usually treated as a capability issue, because it concerns the employee's ability to do the role due to ill-health.

Your decision needs to be based on evidence, not frustration, rota pressure or assumptions about the employee's condition. A tribunal would usually look at whether you acted reasonably in all the circumstances, including the size and resources of your business, the nature of the job, the medical evidence available and the effect of the absence on your operations.

Generally, dismissal will only become a realistic option when:

• You have up-to-date medical evidence about the condition, likely recovery period and ability to return to work.
• You have consulted the employee and allowed them to comment on the evidence.
• You have considered whether the condition may be a disability under the Equality Act 2010.
• You have considered reasonable adjustments, a phased return, changed duties, altered hours or remote work where practical.
• You have looked for suitable alternative roles where your business has them.
• You have warned the employee that dismissal is being considered before any final decision is made.

Official references include GOV.UK guidance on dismissals due to illness, GOV.UK guidance on reasons for dismissal and ACAS guidance on occupational health. You may also find these resources useful: performance management and termination processes, workplace policies and employment law advice.

If you're dealing with recurring short absences rather than one long absence, the process can look different. You may need absence triggers, return-to-work meetings, warnings and a careful review of whether the absences are disability-related. For more on managing performance and capability issues, see our guide to legal aspects of performance management.

How Long Can Someone Be On Sick Leave Before Dismissal?

There's no UK rule that says you can dismiss someone after 3 months, 6 months or 12 months of sickness absence. Length of absence matters, but it's only one part of the decision.

Some employers use internal policy stages, such as a formal review after a certain number of weeks or months. That can be helpful for consistency, but it doesn't replace the need to assess the individual case. A dismissal after 4 months could be unfair if the employee was close to returning with adjustments. A dismissal after 12 months may be fair if the evidence shows no foreseeable return and alternatives have been properly considered.

There are two practical timelines to keep separate:

• Sick pay: Statutory Sick Pay is only payable for a limited period if the employee qualifies. Occupational sick pay depends on the employment contract or policy. The end of sick pay doesn't automatically end employment.
• Employment: The employment relationship can continue beyond sick pay, unless it's lawfully ended through resignation, dismissal or another valid route.

Before moving towards dismissal, ask what the latest medical evidence says, whether there's a likely return date, whether adjustments could work, how the absence affects the business and whether similar cases have been treated consistently.

If the employee has been providing fit notes, don't simply ignore them. Fit notes can be part of the evidence, but they aren't always enough for a final capability decision. For connected issues, see our guides to handling doctors' sick notes and medical information at work.

What Are The Legal Protections For Employees On Sick Leave?

Employees on long-term sick leave can have several overlapping protections. The most important are unfair dismissal rights, disability discrimination protections, contractual rights and data protection rights.

Unfair Dismissal Rights

At the time of writing, employees usually need 2 years' continuous service to bring an ordinary unfair dismissal claim in Great Britain. From 1 January 2027, this is due to reduce to 6 months for most employees. Automatically unfair dismissal and discrimination claims can apply without that ordinary qualifying period.

If the employee has ordinary unfair dismissal rights, you need both a fair reason and a fair process. Ill-health capability can be a fair reason, but only if you have acted reasonably before deciding to dismiss.

Potentially fair reasons for dismissal include capability, conduct, redundancy, legal restriction and some other substantial reason. A long-term sickness dismissal should be clearly framed around capability. It shouldn't be a disguised redundancy, a reaction to inconvenience or an attempt to avoid contractual sick pay. Explore our simple explanation of what happens if a contract is broken for wider context on employment contract obligations.

Disability Discrimination And Reasonable Adjustments

Under the Equality Act 2010, a person is disabled if they have a physical or mental impairment that has a substantial and long-term adverse effect on their ability to carry out normal day-to-day activities. Many long-term health conditions can meet this test, including some mental health conditions, chronic pain conditions, cancer, long COVID symptoms and recurring illnesses.

Disability discrimination claims don't require the ordinary qualifying period, and compensation can be uncapped. This is why you need to consider disability early, even if the employee hasn't used the word disability.

Reasonable adjustments might include a phased return, changed duties, flexible start and finish times, remote or hybrid working, extra breaks, modified targets, adjusted absence triggers, equipment or redeployment into a suitable vacancy.

You don't have to make adjustments that are genuinely unreasonable for your business. Cost, practicality, health and safety, impact on service and business size can all be relevant. However, you do need to show that you considered the options properly rather than rejecting them out of hand. For guidance on disability law and workplace behaviour, see our article on harassment and discrimination in the workplace.

Medical Information And Privacy

Medical information is sensitive personal data. Under the UK GDPR and Data Protection Act 2018, you should only collect what you need, explain why you need it, keep it secure and limit who can access it. Occupational health reports are often more useful than a brief fit note because they can focus on work capacity, adjustments and likely return dates.

What Procedure Should Employers Follow Before Dismissing On Sick Leave?

A fair process doesn't need to be overly complicated, but it does need to be careful, documented and genuinely open-minded. Use this checklist before making any final decision.

1. Check The Contract And Policies: Review the employment contract, sickness policy, capability policy, sick pay terms and any relevant handbook procedures.
2. Keep In Reasonable Contact: Agree how often you'll communicate and avoid either silence or excessive pressure. Record key conversations.
3. Get Current Medical Evidence: Seek fit notes, occupational health input or a medical report where appropriate. Ask practical work-focused questions.
4. Consult With The Employee: Share the key evidence, ask for their views and invite them to suggest adjustments or alternatives.
5. Consider Disability And Adjustments: Identify whether the condition may be a disability and assess reasonable adjustments carefully.
6. Look For Alternatives: Consider adjusted duties, temporary cover, reduced hours, a phased return or suitable vacancies.
7. Warn That Dismissal Is Possible: If dismissal is being considered, say so clearly in writing before the final meeting.
8. Hold A Formal Meeting: Invite the employee to respond, bring a workplace companion where appropriate and provide any relevant documents in advance.
9. Make A Reasoned Decision: Decide after the meeting, not before it. Confirm the outcome in writing with clear reasons.
10. Offer An Appeal: Give the employee a genuine right to appeal, ideally heard by someone not involved in the original decision if your business can manage that.

At each stage, keep notes. Helpful records include letters, emails, meeting notes, medical reports, fit notes, adjustment options considered, vacancy searches and reasons why options were or weren't workable.

If the illness may have been caused or worsened by work, such as stress, workload or a workplace incident, take extra care. You may need to review health and safety obligations, risk assessments, workload, management behaviour and any grievance or complaint. See our Health & Safety in the Workplace guide for more.

What Should A Long-Term Sick Leave Dismissal Letter Say?

If dismissal is a possible outcome, your letters should be clear, respectful and specific. A lawyer should tailor the wording to your facts, especially where disability, workplace stress, mental health or a disputed medical position is involved.

A letter inviting the employee to a final capability meeting will usually cover:

1. Employee And Role Details: Confirm the employee's name, role, department and the relevant absence period.
2. Purpose Of The Meeting: Explain that the meeting is to discuss ongoing ill-health capability and that dismissal is a possible outcome.
3. Medical Evidence: List the fit notes, occupational health reports or other evidence you'll rely on.
4. Business Impact: Explain the practical impact of the absence on the business, team, customers or operations.
5. Adjustments And Alternatives: Summarise the adjustments, phased return options or vacancies considered so far.
6. Employee Input: Invite the employee to provide updated medical information, comments or alternative proposals.
7. Companion: Confirm whether they may bring a trade union representative or workplace colleague.
8. Meeting Details: Set out the time, date, location or video link and any accessibility arrangements.
9. Next Steps: Explain what may happen after the meeting and when they can expect an outcome.

If you decide to dismiss after the meeting, the outcome letter should explain the reason for dismissal, the evidence relied on, why adjustments or alternatives weren't enough, the notice arrangements, holiday pay, any sick pay position and the right of appeal. For more on the end of employment arrangements, visit our guide to end of a contract.

What Payments Are Due If You Dismiss Someone On Long-Term Sick Leave?

An employee dismissed while on sick leave is still entitled to the payments due under their contract and employment law. Common final payments include:

• Notice Pay: This may be statutory notice, contractual notice or pay in lieu of notice if the contract allows it.
• Accrued Holiday Pay: Holiday continues to accrue during sickness absence. Any accrued but untaken holiday should be paid on termination.
• Sick Pay: Pay any Statutory Sick Pay or contractual sick pay due up to the relevant date, subject to the rules and the contract.
• Other Contractual Sums: Check for commission, bonus, expenses or benefits that may be due under the contract or policy.

Holiday can be tricky because workers who can't take holiday due to sickness may have carry-over rights. Be sure you understand your obligations under each employee's contract and the statutory rules for holiday entitlement.

Dismissal for ill-health capability isn't the same as redundancy. Redundancy is about the employer's reduced need for work of a particular kind, not the employee's health. If the role still exists and the issue is the employee's ability to do it, capability is usually the relevant reason.

Worked Example: How A Fair Process Can Change The Outcome

Imagine a small marketing agency with 18 staff. Priya, an account manager, has been absent for 7 months after a serious back condition. Her role involves managing client accounts, attending meetings and preparing campaign reports. The agency is worried about cost and client service, but it doesn't jump straight to dismissal.

It reviews Priya's contract and sickness policy, holds welfare meetings, gets an occupational health report and considers adjustments. The report says Priya may be fit to return in 8 to 10 weeks if she works from home, starts on 3 half-days per week and avoids long periods of sitting. The agency also checks vacancies and agrees a 6-week phased return plan.

On those facts, immediate dismissal at month 7 would be high risk because there's a credible return plan and practical adjustments. But if updated medical evidence said Priya was unlikely to return to any account management duties for at least another 12 months, and no adjustments or vacancies were available, dismissal may become a fair outcome after consultation, clear reasons, correct payments and an appeal.

What Legal Risks Do Employers Face If The Process Is Not Followed?

The main risks are unfair dismissal, disability discrimination, breach of contract and employee relations damage. These risks often overlap, especially where the medical condition is long-term or mental health related.

• Unfair Dismissal: An employee with enough service may argue there was no fair reason or the process was unfair.
• Disability Discrimination: Claims may arise if you dismiss because of something linked to a disability, fail to make reasonable adjustments or treat the employee unfavourably without proper justification.
• Breach Of Contract: This can happen if you don't pay the right notice, sick pay, holiday pay or other contractual sums.
• Data Protection Issues: Mishandling medical information can create privacy and trust problems, as well as regulatory risk.
• Morale And Reputation: Staff notice how sickness is handled. A rushed or insensitive process can damage confidence across the team.

Extra care is needed where the absence relates to pregnancy, disability, workplace stress, whistleblowing, health and safety concerns or a grievance. Those issues can create additional legal protections and make a standard absence process unsuitable.

If you're unsure whether your process is ready, it can help to stress-test the documents, meeting notes and decision before the final step. Our employment contract review service can help you check the contract and policies, and our guide to navigating termination of employment provides practical tips for difficult exits.

Key Takeaways

• You can dismiss an employee on long-term sick leave, but it should usually be a last resort after evidence, consultation and alternatives.
• There's no automatic time limit for dismissal. The key question is whether dismissal is reasonable in the individual circumstances.
• Medical evidence, occupational health input and employee consultation are central to a fair ill-health capability process.
• If the condition may be a disability, you must consider reasonable adjustments before dismissal.
• Final payments usually include notice, accrued holiday pay and any sick pay or contractual sums due.
• Keep clear records at every stage, including why adjustments or alternative roles weren't workable.

If you'd like help with long-term sickness absence processes, capability dismissal letters, reasonable adjustments or employment contracts, you can reach us at 08081347754 or team@sprintlaw.co.uk for a free, no-obligations chat.