Managing Sick Leave: Legal Requirements & Best Practice (UK)

When an employee calls in sick, it can throw even the best-run businesses off balance. You want to be supportive-and legally compliant-while also keeping your business running smoothly. With ever-evolving employment law in the UK, managing sick leave isn’t only about compassion; it’s a crucial part of getting your legal foundations right from day one. So, what should you do when someone’s off work, and what does the law say? If you’re a business owner, manager, or HR professional, understanding the rules surrounding sick leave in the UK-along with best practices-will help you avoid costly missteps and support your people in the right way. Let’s break down what you need to know, from statutory sick pay rights to practical dos and don’ts.

What Is Sick Leave and Why Does It Matter?

Sick leave is time off work that an employee takes when they’re ill or injured and unable to work, including for mental health reasons. In the UK, there’s a well-defined set of rules around how sick leave is reported, paid, and managed-meaning you can’t simply make up your own process. Getting it wrong doesn’t only risk legal trouble; it can damage your relationship with team members, make your workplace less attractive, and lead to bigger headaches like disputes or claims for unfair dismissal or discrimination.

What Are the Legal Requirements for Sick Leave in the UK?

UK law sets out your main obligations as an employer when it comes to employees off sick. Here’s what you need to know.

Statutory Sick Pay (SSP) and Eligibility

• Statutory Sick Pay (SSP) is the legal minimum that most employers must provide if an eligible employee is off work sick for at least four consecutive days. The current SSP rate is set by the government and typically changes every year.
• Employees must earn at least the Lower Earnings Limit (set by HMRC) to qualify. They also need to follow your sickness reporting procedures.
• You must pay SSP for up to 28 weeks per sickness absence period. Some employers offer more generous contractual sick pay-if so, those rules must be clear in your employment contract or company sick leave policy.

Failure to provide SSP or contractual sick pay where due can lead to complaints or legal action through an employment tribunal.

Notice, Evidence, and Fit Notes

• Employees should inform you as soon as possible if they’re going to be off sick. Most employers set out the procedure in the employment contract or staff handbook.
• For absences up to seven days, employees can self-certify, sometimes using a form you provide.
• For absences of more than seven consecutive days (including non-working days), employees need to provide a fit note from a doctor ("sick note"). You can only require further medical evidence in limited circumstances.

Learn more about handling medical leave in the UK over on our blog.

Employment Law Compliance

• Employment contracts, policies, and your actual handling of sick leave must comply with the Employment Rights Act 1996, Equality Act 2010 (to prevent discrimination), and other relevant laws.
• Failing to treat people fairly when they’re ill can lead to claims-particularly if the illness relates to a disability under equality law.
• If an employee is frequently absent or on long-term sick leave, following a proper, non-discriminatory process is crucial to avoid claims of unfair dismissal or constructive dismissal.

What Are Employers’ Duties When Managing Sick Leave?

Let’s walk through what you should-and shouldn’t-do when someone is off sick. Your response can make all the difference both legally and in terms of staff wellbeing.

The Dos

• Keep in appropriate contact: Stay in touch with absent employees, but make sure it’s supportive, not intrusive. A quick message to check how they are (and get a likely return date) is usually appreciated, but constant calls can cross the line.
• Support return to work: When your employee is ready, help facilitate their return. This might mean agreeing adjustments-for example, a phased return or altered duties-especially if the employee has a disability or ongoing health condition.
• Keep accurate records: Log sickness absence, correspondence, fit notes, and any support provided. This isn’t just best practice-it could be vital evidence if there’s a dispute later.
• Maintain confidentiality: Medical information is sensitive personal data under the UK GDPR and Data Protection Act 2018. Only share information on a “need to know” basis and keep records secure.

The Don’ts

• Don’t pressure employees to return too soon or question the validity of a doctor’s note without proper grounds.
• Don’t ask intrusive questions about their medical condition. Focus on what adjustments can help, not on demanding private health details.
• Don’t ignore absenteeism. If someone is repeatedly off sick or on long-term leave, make sure to follow your sickness absence management procedures fairly-don’t just sweep issues under the rug.
• Don’t mishandle data: Mishandling sensitive medical data can lead to a breach of data protection laws, which carries significant penalties.

If you’re unsure how to balance care with legal compliance, it’s a great time to get a contract review or advice from a legal expert.

What Should a Sick Leave Policy Cover?

Your written sick leave policy isn’t just paperwork-it’s your roadmap for getting this process right. Every business should have one in place, tailored to their needs. Here’s what to include:

• Reporting procedures: How should staff notify you when they’re off sick? Who do they contact, and by what time?
• Fit Notes: When will you ask for one, and what is the process?
• Pay arrangements: Will you pay just SSP, or do you offer additional sick pay? Be clear on eligibility and any stages of pay (full, half, etc.).
• Keeping in touch: Set expectations for how and when you’ll check in.
• Return to work: How will you handle phased returns, adjustments, or occupational health referrals if needed?
• Data & confidentiality: Outline who will see sensitive data and how it will be protected.

Not sure where to start? Our team offers practical help in drafting terms and policies to keep your business protected and compliant.

How Should You Manage Long-Term Sickness Absence?

When an employee is off sick for weeks (or even months), you need to tread carefully, balancing empathy with your business needs. Here’s how:

Regular, Reasonable Check-Ins

Arrange scheduled check-ins (by phone, email, or in person, as appropriate). The goal is to keep updated on prognosis and discuss possible return-to-work options-not to rush or harass the employee.

Consider Adjustments

Under the Equality Act 2010, if the employee’s illness is a disability, you must make ‘reasonable adjustments’-things like altered hours, duties, or workplace adaptations. Failing to do this can amount to disability discrimination. You can read more about disability accommodations and employment rights here.

Use Expert Help Where Needed

If the medical situation is complex, you may want to refer to an occupational health expert. Always get the employee’s consent before seeking a medical report and share the outcome transparently.

Follow a Consistent and Fair Process

Have a clear process for long-term absence and ensure you follow it for every employee. This helps avoid favouritism claims or disputes-and makes it much easier to defend if your decisions are ever challenged. In some cases, prolonged absence may lead to capability procedures (where you consider whether the employee can still do the job). Always seek legal advice before moving towards dismissal on capability grounds-a misstep here is a common source of unfair dismissal claims.

What Are You Allowed to Do When Off Sick?

Employees sometimes ask, “What am I allowed to do when off sick?” This can be a grey area, but here are the general principles:

• Recovering comes first: Employees should avoid activities that might hinder their recovery or worsen their condition.
• Some activities may be reasonable: For example, a brief walk, shopping for essentials, or gentle socialising is usually fine, unless it undermines the reason for absence (e.g. being seen at a nightclub while off sick with stress might not look good!).
• Following fit note advice: If a doctor recommends light activities, graded return to normality, or certain restrictions, the employee should adhere to this.
• Working elsewhere: Working for another employer while on sick leave from your main job is generally not allowed and could be a disciplinary matter.

Employers should use common sense and always investigate before jumping to conclusions if there are suspicions about misuse of sick leave.

Can Employees Resign While on Sick Leave?

Yes-employees can hand in their notice whilst on sick leave, just as they could if working. The normal notice period applies, unless your contract says otherwise. During the notice period, contractual sick pay or SSP may still apply if the person remains unfit for work. If you receive a resignation during someone’s absence, acknowledge it in writing and clarify any pay, accrued holiday, and end-of-employment procedures. If you’re not sure how to handle it, a quick consultation can save headaches later.

Is Sick Leave Mandatory in the UK?

While there is no law called “mandatory sick leave”, all employers must comply with their legal obligations surrounding sick pay and fair treatment, and must not penalise employees who are genuinely ill. Providing statutory sick pay and following a fair process is not optional-it’s a legal requirement. Offering additional contractual sick pay is up to each employer, but if it’s promised in your written contract, it’s enforceable by law. Don’t forget that having the right policies in place is a major step in showing you take your legal duties seriously and want an open, healthy workplace. If you’re starting from scratch, you might want to check out our business startup checklist to make sure all your workplace policies are covered.

Do You Need Legal Documents When Managing Sick Leave?

Robust contracts and policies are essential to protect both you and your staff:

• Employment contract: Always lays out sick pay, notification, and evidence requirements.
• Sick leave policy: Explains the detail and process-make it readily available to all staff.
• Staff Handbook: Useful for bringing together all your HR policies including sick leave, annual leave, return to work, etc. Learn more about effective handbooks here.

Keep in mind, too, that legal documents need to be kept up to date. Employment laws-and sometimes statutory sick pay rates-change, so regular reviews are a must.

Key Takeaways: Managing Sick Leave in the UK

• Understand your obligations for Statutory Sick Pay (SSP)-at minimum, you must follow the current legal requirements.
• Set out clear sick leave policies and contracts for staff, specifying notification, evidence, and pay arrangements.
• Maintain confidentiality and treat all medical information securely, in line with data protection laws.
• Offer reasonable support and adjustments for sick employees, especially if there’s a disability involved.
• Manage long-term absence fairly and consistently; don’t move towards dismissal or disciplinary action without following the correct legal process.
• Employees can resign while off sick-ensure you manage the process correctly.
• Keep up to date with employment law changes-review your documents regularly or have them reviewed by a legal expert.

Managing sick leave doesn’t have to be a minefield. With a solid understanding of the rules and best practice, you’ll be ready to support your staff, stay compliant, and protect your business from unnecessary risk.

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If you’d like friendly, professional help with your employment contracts or sick leave policies-or advice on any aspect of UK employment law-get in touch for a free, no-obligations chat. Reach us at 08081347754 or team@sprintlaw.co.uk. Our team is here to help.