UK Absence Management: Sickness & Unauthorised Leave Policies

Imagine waking up on a Monday morning to find three emails in your inbox. One is from Dave, saying he’s off with the flu. Another is from Sarah, who didn’t show up and hasn’t called. The third is from your accountant, asking why payroll doesn’t match the attendance records. Sound familiar? In the UK, Absence Management is the systematic process of tracking, analysing, and managing employee time away from work, ensuring compliance with employment law while maintaining operational efficiency. It’s not just about ticking boxes; it’s about keeping your business running without burning out your managers or breaking the law.

If you’re an HR professional or a small business owner in the UK, you know that handling absence is tricky. You have to balance empathy for sick employees with the need to discipline those who ghost their shifts. This guide breaks down exactly how to handle sickness absence and unauthorised leave under current UK regulations as of late 2026.

The Legal Backbone: What You Must Know

Before we get into the nitty-gritty of policies, let’s clear up the legal landscape. Many employers still confuse Statutory Sick Pay (SSP) with contractual sick pay. They are not the same thing.

Statutory Sick Pay (SSP) is a minimum payment made by employers to eligible employees who are too ill to work, set by the government. As of 2026, the rate remains tied to inflation adjustments, but the core rules haven’t changed much in decades. Employees qualify if they earn at least £123 per week (the Lower Earnings Limit threshold often fluctuates slightly with tax years, so always check HMRC updates). SSP lasts for up to 28 weeks. But here’s the catch: the first three days are usually unpaid unless your company offers "waiting day" coverage.

On the other hand, Contractual Sick Pay is an enhanced benefit provided by the employer, which may offer full pay for a set period beyond SSP requirements. If your contract promises full pay for four weeks, you must pay that, even if SSP only covers a fraction of their salary. Failing to honour this can lead to breach of contract claims.

Crafting a Robust Sickness Absence Policy

Your policy document is your first line of defence. It needs to be clear, accessible, and legally sound. Don’t bury it in a handbook nobody reads. Make it standalone.

Start by defining what counts as sickness. Is stress considered sickness? Yes, generally. Is a hangover? No. Your policy should state that employees must notify their manager within a specific timeframe-usually before their shift starts. Use phrases like "reasonable effort" rather than rigid times, because life happens. Maybe their phone died. Maybe they were unconscious.

Next, address self-certification versus fit notes. For absences lasting seven days or less, employees don’t need a doctor’s note. They can fill out a self-certification form. After seven days, you can request a Fit Note (formerly known as a Med 3) issued by a medical professional confirming an employee's fitness for work or suggesting adjustments. A common mistake? Managers demanding a fit note for a one-day cold. Don’t do that. It frustrates staff and wastes GP resources.

You also need a trigger point system. When does an absence become a concern? Most companies use the Bradford Factor or simple rolling averages. For example, if an employee has more than three instances of short-term absence in six months, a return-to-work interview becomes mandatory. This isn’t punitive; it’s supportive. It helps identify underlying issues like workplace bullying or health problems early.

Tackling Unauthorised Leave

Unauthorised leave is different from sickness. It’s when someone is absent without permission and without a valid reason. Think of it as "ghosting" your job. Handling this requires a firmer touch.

First, define what constitutes unauthorised absence. It includes:

• Failing to call in sick.
• Not showing up for a scheduled shift.
• Taking holiday without approval.
• Leaving early without permission.

When this happens, follow a strict procedure. Do not assume malice immediately. Send a written inquiry asking for an explanation. Give them a deadline to respond-say, 48 hours. If they ignore it, schedule a meeting. Document everything. Emails, texts, voicemails. If they still don’t show up or provide no valid reason, you move to disciplinary action.

Under the ACAS Code of Practice, guidelines issued by the Advisory, Conciliation and Arbitration Service regarding disciplinary and grievance procedures, you must give employees a fair chance to explain themselves before firing them. Skipping steps here is the number one cause of tribunal losses for SMEs. Even if you think they’re guilty, hold the hearing. Let them speak. Record the outcome.

The Return-to-Work Interview: More Than Just a Checkbox

Many managers dread these interviews. They see them as awkward confrontations. But done right, they are powerful retention tools.

The goal isn’t to interrogate. It’s to understand. Ask open questions: "How are you feeling now?" "Is there anything we can do to help you settle back in?" "Do you foresee any further absences?" If an employee has been off for long-term sickness, discuss phased returns. Can they work half-days? Can they start with lighter duties?

For unauthorised absences, the tone changes. Here, you’re establishing facts. "We noticed you weren’t here on Tuesday. We couldn’t reach you. Can you tell us what happened?" Listen carefully. Sometimes, personal crises emerge-childcare breakdowns, transport strikes, mental health struggles. These might mitigate the severity of the offence.

Data Tracking and the Bradford Factor

You can’t manage what you don’t measure. Invest in decent HR software. Spreadsheets break when you hit 50 employees. You need automated tracking of absence types, durations, and patterns.

The Bradford Factor is a formula used to analyse absence patterns, weighting frequent short absences more heavily than infrequent long ones. The logic? Frequent short absences disrupt operations more than one long hospital stay. The formula is B = S² x D, where S is the number of separate spells and D is total days lost. A high score triggers a review. But beware: don’t use it blindly. A new mother returning after maternity leave might have high frequency due to childcare teething problems, not laziness.

Use data to spot trends. Are Mondays particularly bad? That might indicate weekend partying culture or poor scheduling. Are certain departments worse off? Maybe a specific manager lacks training in handling absence.

Common Pitfalls and How to Avoid Them

Let’s look at real-world mistakes I’ve seen in UK businesses.

Pitfall 1: Ignoring Disability Discrimination. Under the Equality Act 2010, some conditions count as disabilities. If an employee’s absence is linked to a disability, you must make reasonable adjustments before disciplining them. Firing someone for being sick when their illness qualifies as a disability is risky.

Pitfall 2: Inconsistent Application. If you fire John for missing two days without notice but give Mary a warning for the same thing, you’ll lose a discrimination claim. Apply policies equally across all staff, regardless of seniority or performance.

Pitfall 3: Poor Communication Channels. If employees don’t know who to call when sick, they won’t call. Ensure contact details are visible everywhere-on the intranet, on the wall, in the welcome pack.

Key Takeaways

• Distinguish between SSP and Contractual Pay: Never confuse statutory minimums with enhanced benefits. Check contracts.
• Follow ACAS Guidelines: Always provide fair hearings for unauthorised absences to avoid tribunal risks.
• Use Data Wisely: Track absence patterns with tools like the Bradford Factor, but interpret results with context.
• Communicate Clearly: Define notification procedures and ensure every employee knows them.
• Be Consistent: Apply policies uniformly to prevent discrimination claims.