Investigating Long-Term Sickness Absence at Work

Posted on 20th April 2026


Long-term sickness absence is a challenge faced by many businesses. While the majority of employees who are signed off work are genuinely unwell, extended absence can create significant financial and operational pressures for employers.

According to recent UK workforce data, sickness absence costs businesses billions of pounds each year, not only through lost productivity but also through the cost of covering roles, managing workloads and maintaining business continuity.

For employers, managing long-term sickness absence is rarely straightforward. Employment law rightly provides strong protections for employees, meaning that businesses must approach these situations carefully and fairly.

The Challenge for Employers
Removing an employee from their role due to long-term sickness is often a complex process. Employers must demonstrate that they have followed a fair procedure, considered medical evidence and explored reasonable adjustments where appropriate.

Without clear information, businesses can find themselves in difficult situations where concerns exist but there is insufficient evidence to take action. Acting on assumption or incomplete information can expose organisations to significant legal risk, particularly where employment tribunal claims are concerned.

This is why many businesses focus on establishing the facts before making decisions about how to proceed.

When Concerns Arise
Concerns can arise in a variety of circumstances during extended sickness absence. These may include situations where reported limitations appear inconsistent with observed activity, where information provided to the employer is unclear or where patterns of behaviour raise questions that require further clarification.

In these cases, employers are often seeking reassurance as much as anything else. In many situations, enquiries simply confirm that the absence is genuine and allow the business to continue supporting the employee appropriately.

However, where inconsistencies do exist, understanding the reality of a situation can help employers avoid ongoing financial exposure and manage the matter through appropriate HR procedures.

The Role of Workplace Investigations
Workplace investigations can provide employers with factual information about an employee’s activity during a period of sickness absence. This information is gathered lawfully and proportionately and can help organisations understand whether reported limitations are consistent with day-to-day behaviour.

The objective is not to accuse or confront employees, but to provide clarity where uncertainty exists.

For businesses, this type of information can be valuable in several ways. It can support internal HR processes, assist with disciplinary or capability procedures, and provide evidence if employment matters progress to legal proceedings.

Having accurate information also allows employers to make decisions with greater confidence, ensuring that any action taken is based on evidence rather than assumption.
 

Protecting Businesses and Fair Process
Long-term sickness absence must always be handled sensitively. Many employees experience genuine health challenges and require support rather than scrutiny.

However, businesses also have a responsibility to protect the integrity of their workplace policies and ensure that absence procedures are applied fairly to all employees.

Where questions arise, establishing the facts can help employers balance these responsibilities while protecting the organisation from unnecessary financial loss.

Investigations do not replace HR processes or medical assessments, but they can provide valuable clarity when situations become uncertain.

For many organisations, having access to reliable information can make the difference between prolonged uncertainty and making informed decisions that support both the business and fair employment practices.

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