Can You Fire Someone For Being Sick In The UK?

Managing sickness absence is part and parcel of running a small business. But when absences become frequent or long-term, you may be wondering where you stand legally - and whether dismissal is ever an option.

The short answer: you can fairly dismiss for sickness in certain circumstances, but only after a careful, lawful process. Getting it wrong risks unfair dismissal and discrimination claims - which can be expensive and time‑consuming.

In this guide, we break down what UK law requires, when dismissal for ill-health can be fair, and the steps to take so you stay compliant and protect your business.

Can You Dismiss An Employee For Being Sick In The UK?

Potentially, yes - but the circumstances are narrow and the process matters. In UK law, a dismissal will only be fair if it falls within one of the fair reasons and you act reasonably in all the circumstances (Employment Rights Act 1996). Capability (including ill health) can be a fair reason, provided you follow a reasonable process and consider alternatives first.

At the same time, you must avoid discrimination under the Equality Act 2010. If the employee’s condition meets the legal definition of a disability (a physical or mental impairment with a substantial and long-term adverse effect on normal day-to-day activities), you must make reasonable adjustments and take extra care. A knee‑jerk dismissal because someone is unwell can expose you to disability discrimination claims even if the employee lacks the two years’ service normally required for ordinary unfair dismissal.

Key legal pillars to keep in mind:

• Employment Rights Act 1996 - sets out fair reasons for dismissal and the requirement to follow a fair process.
• Equality Act 2010 - prohibits discrimination and requires reasonable adjustments for disabled employees.
• Statutory Sick Pay (SSP) regime - governs minimum sick pay obligations and record‑keeping.
• ACAS principles - while not law, tribunals look closely at whether you acted reasonably and consistent with ACAS guidance on process, consultation and evidence.

If you’re facing persistent frequent sick days or a long period off work, the law doesn’t expect you to wait forever - but it does expect you to gather facts, explore support and adjustments, consult, and document your decisions.

When Is Dismissal For Sickness Potentially Fair?

There are two common scenarios where capability dismissal might be fair:

1) Long-Term Sickness Absence

Where an employee has been off for an extended period and there’s no clear prospect of a return to work (or return within a reasonable timeframe), dismissal may be fair if you’ve:

• Obtained up-to-date medical evidence (with consent), including prognosis and likely timescales.
• Consulted with the employee and considered their views and any return-to-work options.
• Explored reasonable adjustments and alternatives, such as modified duties or redeployment.
• Warned the employee that dismissal is being considered and given them the opportunity to respond.

Even in difficult scenarios, tribunals expect a considered, evidence‑based approach. Review our guide to the legal ground rules for long-term sick leave for a deeper dive into your obligations during extended absence.

2) Intermittent Or Short-Term Absence

Frequent short absences can severely impact small teams. A fair dismissal may be possible if absence levels are unsustainable and you’ve:

• Identified a clear attendance standard and communicated it to the employee.
• Followed a staged process (informal support, then formal warnings) with time to improve.
• Checked medical reasons and patterns, and ruled out disability or pregnancy‑related illness.
• Considered adjustments or temporary changes to support improvement.

Be careful to treat like cases alike and apply policies consistently. Absence management that’s rushed or inconsistent can lead to unfair dismissal findings - especially where you didn’t consider underlying causes or reasonable adjustments.

A Lawful Capability/Ill-Health Dismissal Process: Step By Step

A “fair” reason alone isn’t enough - the process you follow is equally important. A practical, defensible pathway usually includes the following steps.

1) Gather Evidence And Keep Records

Start with the facts. Collate absence records, fit notes, return-to-work forms and any adjustments or support you’ve provided. If you receive a doctor’s sick note (fit note), take it seriously and avoid second‑guessing medical advice. Where appropriate, seek occupational health input or a medical report (with consent) to understand prognosis, limitations and adjustments that could help.

2) Consult And Consider Adjustments

Meet with the employee to understand what’s going on and what support might assist. Consider reasonable adjustments such as:

• Temporary changes to duties, hours or workload.
• Flexible or hybrid working.
• Phased return to work plans.
• Provision of equipment or training.
• Redeployment to a suitable alternative role.

If the condition may amount to a disability, your duty to make reasonable adjustments under the Equality Act 2010 becomes central. What’s “reasonable” varies with size, resources and feasibility, but you should be able to show you genuinely tried to keep the person in work.

3) Set Clear Expectations And Timescales

Where a return is possible, agree realistic timescales and checkpoints. For intermittent absence cases, communicate attendance targets and the support you’ll provide. If performance or attendance doesn’t improve, move to formal stages.

4) Follow A Fair Procedure (Warnings, Meetings, Right To Be Accompanied)

For intermittent absence, a staged process often involves informal counselling, then formal warnings and a final review. For long‑term absence, you’ll usually consult, obtain medical evidence, consider adjustments, and, if no reasonable alternative exists, invite to a formal capability hearing before any decision to dismiss.

Ensure the employee has the right to be accompanied, receives the evidence in advance, and has a chance to respond. Where appropriate, a final written warning may precede dismissal for intermittent absence.

5) Consider Alternatives To Dismissal

Before deciding to dismiss, ask yourself: have we genuinely tested adjustments, explored redeployment, and considered extended unpaid leave or a further review period? Document your reasoning and why lesser measures won’t work.

6) Decide, Communicate And Offer Appeal

If dismissal is the outcome, confirm the reason (capability/ill-health), notice or payment in lieu, holiday pay, and any contractual benefits. Offer a right of appeal and provide your decision rationale in writing. Where applicable, consider whether an ill-health capability dismissal has any impact on contractual benefits such as income protection.

Solid documentation at each stage is your best defence. Tribunals regularly find otherwise fair dismissals to be unfair because the employer skipped consultation, didn’t obtain medical evidence, or overlooked reasonable adjustments.

Pay, Benefits And Sick Leave: What Are You Required To Provide?

Understanding the basics of sick pay and benefits helps you make fair decisions and communicate clearly.

Statutory Sick Pay (SSP)

Eligible employees are entitled to SSP for up to 28 weeks at the statutory rate, if they’re off sick for four or more consecutive days (including non‑working days) and meet earnings requirements. Keep accurate records and provide SSP where due. Your contracts might also offer contractual sick pay over and above SSP - if so, follow your policy consistently.

Holiday Accrual And Notice

Holidays continue to accrue during sick leave. Employees can take holiday while on sick leave by agreement, which can help with pay continuity. If you’re contemplating dismissal, make sure you factor in accrued but untaken holiday and notice pay (or pay in lieu).

Income Protection Or PHI Policies

If you provide permanent health insurance (PHI) or income protection as a benefit, take legal advice before dismissal. Dismissing an employee while they’re entitled to benefits can lead to breach of contract claims. The policy wording and your contractual commitments will be crucial.

Medical Information And Data Protection

Medical data is highly sensitive. Under the UK GDPR and Data Protection Act 2018, you must have a lawful basis and appropriate safeguards to process health information, keep it confidential, and store only what you need. It’s also sensible to be clear with staff about what medical information you require for absence management and why.

Policies, Contracts And Documentation To Protect Your Business

Clear documentation reduces disputes and helps you handle sickness fairly and consistently.

• Employment contracts - set out sick pay, reporting procedures, consent to medical examinations, and the right to suspend on medical grounds if needed. If you’re hiring or updating terms, ensure your Employment Contract covers sickness provisions clearly.
• Staff handbook - include an absence management policy, return‑to‑work process, triggers for formal review, medical evidence requirements, and how you’ll consider adjustments. A well‑crafted Staff Handbook keeps expectations consistent across your team.
• Capability and disciplinary policies - explain the staged approach (informal support, warnings, capability hearing) and the right to be accompanied and appeal.
• Data protection - include internal rules for handling health data, retention periods and access controls, aligned with your broader Privacy Policy.
• Return‑to‑work documentation - simple forms help capture adjustments agreed and follow‑up dates.

If you operate probationary periods for new starters, document how sickness absence will be assessed during probation and how extensions or termination may be handled fairly. Our guide to probation explains good practice here.

Common Employer Pitfalls (And How To Avoid Them)

Even well‑intentioned managers can slip up when illness impacts performance or attendance. Here are frequent mistakes and how to avoid them.

1) Treating Fit Notes As Optional

Ignoring medical advice is a fast route to risk. If a GP or occupational health suggests adjustments or a phased return, take it seriously. If you doubt the note, seek further occupational health input rather than dismissing a doctor’s sick note outright.

2) One-Size-Fits-All Policies

Policies provide consistency, but you still need to consider individual circumstances - especially where disability could be in play. What is “reasonable” for one role or business might not be for another. Record your reasoning either way.

3) Skipping Medical Evidence

Tribunals expect employers to make informed decisions. Before concluding someone can’t return within a reasonable timeframe, obtain up‑to‑date medical evidence and consult with the employee about it.

4) Moving Too Fast On Intermittent Absence

For frequent short absences, apply your attendance policy progressively. Use informal support first, then formal steps and warnings with measurable improvement targets. If you jump straight to dismissal, it’s hard to justify that as “reasonable.”

5) Poor Record‑Keeping

Keep clear notes of meetings, adjustments offered, support provided, and your reasoning at each stage. Thorough records are often the difference between a fair and unfair dismissal finding.

6) Overlooking Alternatives

Before dismissal, scrutinise alternatives like redeployment, flexible hours or a short extension to a review period. If those won’t work, record why. That paper trail matters.

If you’re unsure whether a situation is heading towards a fair capability dismissal, it can help to step back and benchmark against our practical guide to ill‑health capability dismissal and the staged approach to handling frequent sick days.

Frequently Asked Questions

Can We Dismiss During Probation For Sickness?

Probation doesn’t remove your discrimination obligations. You can end employment more easily during probation if the process is fair and non‑discriminatory, but take care if absences relate to a potential disability or pregnancy. Communicate concerns early, consider adjustments, and document your reasoning. Build these points clearly into your Employment Contract and handbook.

How Long Do We Have To Wait Before Considering Dismissal?

There’s no fixed minimum. What’s “reasonable” depends on prognosis, the role’s demands, your business size and whether adjustments could enable a return. For long‑term absence, obtain medical evidence and set review points. For intermittent absence, use a staged process with clear improvement targets.

What If The Employee Refuses To Engage?

Invite them to meetings in writing, share evidence, and offer reasonable opportunities to respond, including in writing if attendance is difficult. If they don’t engage despite reasonable efforts, you may proceed on the information available - but record your attempts to consult.

Do We Have To Pay For Occupational Health Reports?

Usually, yes - if you’re referring someone for a report, the employer pays. Secure written consent, share relevant questions in advance, and allow the employee to see the report. Use it as part of a fair, consultative process.

Should We Suspend Someone On Medical Grounds?

Medical suspension should be used sparingly and with pay (subject to contract). It’s usually more appropriate where there are health and safety concerns. Follow your policy and avoid assuming illness equals incapacity without evidence. If suspension is part of a conduct investigation, follow separate suspension rules.

What About Return-To-Work Plans?

Phased returns and planned adjustments often deliver better outcomes and reduce disputes. Agree the plan, write it down, and book review dates. Our overview of best practices for managing return to work sets out what to consider at each stage.

Key Takeaways

• You can fairly dismiss for ill-health in the UK - but only after a reasonable, evidence‑based process that considers alternatives and adjustments.
• Always check Equality Act 2010 risks. If a condition may be a disability, you must consider and implement reasonable adjustments where feasible.
• For long‑term absence, obtain medical evidence, consult, review options and document why continued absence is not sustainable before dismissing.
• For intermittent absence, use a staged process with clear expectations, support, warnings and a final review before any dismissal.
• Make sure your contracts and policies set out sick pay, reporting, medical evidence and capability procedures. A robust Staff Handbook and clear Employment Contract are essential.
• Handle medical data lawfully, take fit notes seriously, and keep thorough records at each step.
• When in doubt, pause and get advice - a quick sense‑check can prevent an expensive unfair dismissal or discrimination claim.

If you’d like tailored help with an absence management process, adjustments, or a potential dismissal, our team is here to help. You can reach us on 08081347754 or team@sprintlaw.co.uk for a free, no‑obligations chat.