Fitness to work is the process by which employers assess whether an employee is capable of performing their role safely and effectively. In the UK, this typically involves occupational health referrals, fit note assessments, and return-to-work interviews. There is no single statutory framework for fitness to work — the obligations arise from health and safety law, the Equality Act 2010, and the management of sickness absence.
This guide covers how fitness to work assessments operate, the role of occupational health, and how to manage returns to work after illness or injury.
Key takeaways
- Occupational health (OH) assessments evaluate whether an employee can perform their role safely.
- You can refer an employee to OH with their consent — you cannot force an assessment without it.
- Fit notes from GPs provide advice on work capacity — “not fit” or “may be fit with adjustments.”
- Return-to-work interviews are best practice for managing the transition back.
- The Equality Act 2010 requires reasonable adjustments for disabled employees.
Occupational health referrals
Occupational health is a specialist field that assesses the relationship between an employee’s health and their ability to work. You can refer an employee to OH when:
- They have been absent for a prolonged period (commonly 4+ weeks).
- You have concerns about their ability to perform their role safely.
- You need advice on adjustments for a disability or long-term condition.
- There are health and safety concerns related to the employee’s condition.
The employee must consent to the referral. You cannot force an OH assessment, though refusal to cooperate may be treated as a conduct issue if it is a reasonable request.
What OH assesses
Occupational health typically provides advice on:
- The employee’s current fitness to perform their role.
- Any adjustments that would enable them to work safely.
- The expected duration of any limitation.
- Whether the employee’s condition qualifies as a disability under the Equality Act 2010.
- Any health and safety risks to the employee or others.
OH does not provide a diagnosis to the employer — they provide functional advice (what the employee can and cannot do) without disclosing the medical condition itself.
Fit notes
The GP fit note is the primary mechanism for assessing fitness to work in the UK. Since 2010, fit notes have replaced the older “sick note” system and provide more nuanced advice.
A fit note can state that the employee is:
- Not fit for work — they should not attend work at all.
- May be fit for work — with specific adjustments suggested by the GP.
The fit note suggestions are advisory, not binding. You are not legally required to implement the GP’s suggestions, but you should give them serious consideration. Ignoring fit note advice without a business justification may be seen as unreasonable.
Common fit note suggestions
| Suggestion | Example |
|---|---|
| Reduced hours | Work 4 hours per day instead of 8 |
| Modified duties | Avoid lifting, use only ground-floor access |
| Changed workplace | Work from home, move to a quieter office |
| Phased return | Start with 3 days per week, building to 5 |
Return-to-work interviews
A return-to-work interview is a structured conversation between the employee and their manager after an absence. It is not a statutory requirement, but it is considered essential best practice by ACAS.
The interview should cover:
- The employee’s current health and any ongoing limitations.
- Any adjustments needed for the return.
- The fit note advice and how it will be implemented.
- Any workplace concerns that may have contributed to the absence.
- A support plan for the return period.
The tone should be supportive, not interrogatory. The purpose is to facilitate a smooth return, not to penalise the employee for being absent.
Reasonable adjustments
Under the Equality Act 2010, s.20–21, employers must make reasonable adjustments for disabled employees. This duty arises when:
- A provision, criterion, or practice puts a disabled person at a substantial disadvantage.
- A physical feature of the workplace creates a barrier.
- The absence of an auxiliary aid makes the workplace inaccessible.
Reasonable adjustments for fitness to work may include:
- Modified duties — removing tasks the employee cannot perform.
- Adjusted hours — reduced hours, flexible start/finish times.
- Equipment — providing ergonomic furniture, assistive technology.
- Workplace changes — relocating the employee, providing a quiet space.
- Phased return — gradually increasing hours over several weeks.
Long-term absence and capability
If an employee remains unfit for work despite OH advice and reasonable adjustments, you may need to commence a capability process under your disciplinary policy. This should:
- Be a last resort — after all reasonable adjustments have been explored.
- Be managed through a fair process — with OH input and proper notice.
- Consider the employee’s length of service and any disability discrimination risks.
- Offer rehabilitation and return-to-work support where possible.
For more UK context, see our guides to long-term sick leave, disability leave, and suspension leave.
Frequently asked questions
Can I force an employee to attend an occupational health assessment?
No. The employee must consent. However, refusal to cooperate with a reasonable request may be treated as a conduct issue.
What is the difference between a fit note and an OH assessment?
A fit note is issued by the employee’s GP and provides general advice on fitness to work. An OH assessment is a specialist workplace assessment that provides specific, role-related advice on adjustments and fitness.
Do I have to follow the GP’s fit note advice?
The fit note is advisory, not binding. You should give it serious consideration and document any reasons for not implementing the suggested adjustments.
How long should a return-to-work interview last?
There is no set duration — typically 15–30 minutes. The key is to cover the employee’s health, any adjustments needed, and a support plan for the return period.
Can I dismiss an employee who is长期 unfit for work?
Only after following a fair capability process, exploring all reasonable adjustments, and obtaining OH advice. Disability discrimination claims are a significant risk — seek legal advice.
Putting it into practice
Five steps keep your fitness to work process effective:
- Include OH referrals and fit note management in your absence policy — specify the triggers and process.
- Train managers to conduct supportive return-to-work interviews.
- Implement fit note adjustments promptly — do not ignore GP advice.
- Track OH recommendations and adjust workplace practices accordingly.
- Document all adjustments and decisions — this protects you if a discrimination claim arises.
A leave management system that tracks fit notes, manages OH referrals, and records return-to-work interviews keeps the fitness-to-work process structured and compliant.
Sources
- GOV.UK — Fit notes (primary source)
- ACAS — Managing health and wellbeing at work
- Equality Act 2010, s.20–21
Last updated: 26 July 2026. This article is general information, not legal advice. Fitness to work and reasonable adjustments carry significant legal obligations — seek legal advice for specific situations.