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Mental Health Sick Leave: What UK Employers Need to Know
Mental health sick leave is time off work because a mental health condition, such as stress, anxiety or depression, affects an employee's ability to do their job. In the UK, it's treated in the same way as sick leave for a physical illness. Employees can self-certify for the first 7 calendar days, need a fit note from day 8, and may be entitled to Statutory Sick Pay (SSP) from their first day of absence.
For employers, managing mental health absence well isn't just about compliance. Handled early and fairly, it reduces the length and cost of absence and protects your people. Handled poorly, it increases the risk of discrimination claims and long-term absence.
This guide explains what UK law requires, what changed with SSP in April 2026, and how to manage stress leave, reasonable adjustments and return to work.
Key takeaways
Same rules as physical illness: mental health sick leave follows the same rules as physical illness, with self-certification for 7 days and a fit note from day 8.
SSP from day one: since 6 April 2026, eligible employees receive SSP from their first day of sickness absence, for up to 28 weeks.
Disability protection: a mental health condition can be a disability under the Equality Act 2010, which triggers a legal duty to consider reasonable adjustments.
Stress risks: employers must assess and manage work-related stress under health and safety law.
Early action works: early contact, adjustments, Occupational Health advice and EAP support help employees return sooner and more safely.
What is mental health sick leave?
Mental health sick leave is a period of absence from work due to a mental health condition that makes an employee unfit for work, or less able to work without support. Common reasons include:
- work-related stress and burnout
- anxiety
- depression
- bereavement and grief
- conditions such as PTSD, OCD or bipolar disorder
There's no separate legal category of "mental health leave" in the UK. Mental health absence falls under your normal sickness absence policy and the same statutory rules as physical illness. That means it should be taken just as seriously and managed just as fairly.
What does UK law say about sick leave for mental health?
Four main areas of UK law apply when an employee is off sick with their mental health: the Equality Act 2010, health and safety law, Statutory Sick Pay, and the fit note rules.
The Equality Act 2010: when is a mental health condition a disability?
Under the Equality Act 2010, a mental health condition is a disability if it has a substantial and long-term adverse effect on a person's ability to carry out normal day-to-day activities. "Long-term" means the effect has lasted, or is likely to last, at least 12 months, or is likely to recur.
Depression, anxiety and other mental health conditions can meet this test, depending on how they affect the individual. There's no need for a formal diagnosis for the protection to apply.
Where an employee's condition meets the definition, employers have a legal duty to:
- make reasonable adjustments to remove or reduce disadvantages at work
- avoid treating the employee unfavourably because of something arising from their disability
- prevent harassment and victimisation related to their disability
In practice, it's good practice to consider adjustments for any employee struggling with their mental health, whether or not the legal definition is met.
Health and safety law: your duty of care
The Health and Safety at Work etc. Act 1974 requires employers to protect the health, safety and welfare of their employees, and that includes mental health. The Management of Health and Safety at Work Regulations 1999 require employers to assess risks to health, including work-related stress, and to take steps to control them.
The Health and Safety Executive's Management Standards for work-related stress are a useful framework. They focus on six areas: demands, control, support, relationships, role and change. [Link to HSE Management Standards]
Employers should also carry out, or review, a stress risk assessment when work factors are contributing to an employee's absence. [Link to Acas guidance on work-related stress]
Related article: Duty of care for mental health: what UK employers need to do
Statutory Sick Pay (SSP): what changed in April 2026?
SSP covers mental health absence in exactly the same way as physical illness. Since 6 April 2026, following changes introduced by the Employment Rights Act 2025:
- Payable from day one: SSP is paid from the first day of sickness absence, as the three waiting days have been removed.
- No lower earnings limit: the lower earnings limit has been removed, so more employees are now eligible.
- New rate: SSP is paid at the standard weekly rate or 80% of the employee's average weekly earnings, whichever is lower.
SSP is still payable for up to 28 weeks. Some employers also offer enhanced contractual sick pay on top.
These changes mean short-term absence now costs employers more from the first day. That makes early support and prevention more valuable than ever.
Fit notes: what employers need to know
- Days 1 to 7: employees self-certify. No medical evidence is needed.
- From day 8: a fit note (statement of fitness for work) is required.
- Who can issue them: since July 2022, doctors, registered nurses, occupational therapists, pharmacists and physiotherapists can all issue fit notes, and digital fit notes are valid.
- How long they last: in the first 6 months of a condition, a single fit note can cover up to 3 months.
A fit note will say either that the employee is "not fit for work" or that they "may be fit for work" with support. Treat it as the start of a conversation, not a final verdict. Discuss the advice with the employee, agree any temporary adjustments or a phased return, and keep a written record.
Good fit note practice includes:
- logging fit note details and setting a review date
- confirming any agreed adjustments in writing
- completing or refreshing a stress risk assessment if symptoms are work-related
- referring to Occupational Health where capacity, restrictions or timescales are unclear
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How much does mental health absence cost UK employers?
Poor mental health is one of the biggest drivers of workplace absence in the UK. According to the Health and Safety Executive, 964,000 workers suffered from work-related stress, depression or anxiety in 2024/25, leading to 22.1 million working days lost. [Link to HSE statistics]
Research from the CIPD has also found mental ill health to be the leading cause of long-term sickness absence, and the second most common cause of short-term absence after minor illnesses. [Link to CIPD Health and wellbeing at work report]
The cost goes beyond sick pay. Mental health absence can lead to:
- lost productivity and pressure on colleagues covering the work
- the cost of temporary cover or recruitment
- management time spent on absence and capability processes
- a higher risk of employment tribunal claims if absence is mishandled
What are the most common mental health reasons for sick leave?
The most common mental health reasons for sick leave are stress, anxiety and depression. Workplace factors often play a part, including heavy workloads, unclear roles, conflict and a lack of support.
HR teams and managers can often spot early warning signs before absence begins, such as:
- fatigue or low energy
- social withdrawal
- a dip in performance or concentration
- regular lateness or short-term absences
- emotional volatility or irritability
- changes in how someone interacts with their team
Acting on these signs early, with a supportive conversation and signposting to help, can prevent a short period of struggle from becoming long-term absence.
Related article: How to support staff with work-related stress
How should employers manage stress leave?
"Stress leave" usually means an employee has been signed off work with stress. The best approach is supportive, structured and well documented:
Acknowledge and record concerns: take what the employee tells you seriously and don't downplay it.
Agree a contact plan: agree how often you'll be in touch and how, and avoid contacting them too often.
Signpost support: make sure the employee knows how to access your EAP and any other support.
Use fit note advice: plan for either continued absence or a safe return to work.
Assess work factors: review workload, role clarity and working relationships, and address any concerns where possible.
Consider Occupational Health advice: for complex, recurrent or long-term cases, and keep a record of decisions, adjustments and risks.
This approach supports recovery, reduces legal risk and shows procedural fairness if a capability process is needed later.
What reasonable adjustments help employees with mental health conditions?
Reasonable adjustments are changes that help an employee stay in work or return to work. Mental health affects everyone differently, so adjustments should be tailored to the individual and reviewed over time. Common examples include:
- Working patterns: flexible hours, a phased return, more frequent breaks and protected time for therapy or medical appointments.
- Workload: a temporary reduction in workload or deadlines, breaking work into smaller tasks and scheduling demanding work at the employee's best time of day.
- Environment: a quieter workspace, or the option to work from home where appropriate.
- Communication: agreed ways of communicating (for example, fewer unscheduled calls) and regular one-to-one check-ins.
Well-chosen adjustments help employees return sooner and more safely, and they reduce the risk of disability discrimination claims. See Reasonable adjustments guide.
Short-term vs long-term mental health absence
Short-term absence usually lasts from a few days to a couple of weeks. Mental health concerns such as stress or anxiety are treated the same as physical illnesses like colds. Employees self-certify for the first 7 days, and eligible employees now receive SSP from day one.
Long-term absence is usually defined as four weeks or more. It's more likely to need a fit note, Occupational Health input, a phased return and a structured return-to-work plan.
Don't overlook repeated short-term absences. A pattern of short absences can be an early sign of an underlying mental health issue, and a supportive conversation at that stage can prevent a longer absence later.
How to run a return-to-work meeting after mental health absence
A return-to-work meeting is good practice after any absence. It's particularly important after mental health absence, especially if work factors contributed. The aim is to support a safe, sustainable return, not to question whether the absence was justified.
Focus the conversation on:
- how the employee is feeling now and any ongoing symptoms
- what they feel able to do, and any temporary adjustments
- whether a phased return would help
- a review date and a named point of contact
Agree the plan in writing. Employees can return before their fit note ends if they feel able to and any necessary adjustments are in place. Where you're unsure about capacity or timescales, an Occupational Health assessment can provide clear, independent advice.
How an Employee Assistance Programme (EAP) helps reduce mental health sick leave
An Employee Assistance Programme (EAP) gives employees fast, confidential access to professional support, often before a problem leads to absence. It also gives managers and HR the expert guidance they need to handle mental health absence confidently and fairly.
Wisdom Wellbeing's clinically led Employee Assistance Programme (EAP) provides:
- 24/7 access to qualified counsellors: short-term, solution-focused counselling to help employees recover and return to work.
- HR advice and management support: guidance on difficult conversations, adjustments and compliant decisions. See: HR and management support
- Occupational Health Assessments: clear advice on fitness for work, restrictions and timescales in complex or recurrent cases.
- Virtual GP access: faster medical advice and fit note conversations. See our Virtual GP service
With the right support in place, organisations can help reduce the number and length of mental health absences, strengthen their absence processes and build a healthier workplace culture.
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Frequently asked questions
What is the UK law on sick leave for mental health?
Mental health sick leave follows the same rules as physical illness. Employees self-certify for the first 7 days and need a fit note from day 8, and eligible employees can receive SSP from their first day off for up to 28 weeks. If a condition meets the Equality Act 2010 definition of disability, employers must also consider reasonable adjustments.
What should we do immediately when an employee reports work-related stress?
Acknowledge and record the concern, agree a contact plan and signpost support such as your EAP. Review workload and any triggers, and carry out or refresh a stress risk assessment where work factors are involved. If the employee is off sick, use the fit note advice to plan adjustments or a phased return.
Can an employee be signed off with stress, and for how long?
Yes. Stress can be given as a reason on a fit note where it affects someone's fitness for work. How long depends on clinical judgement, but in the first 6 months of a condition, a single fit note can cover up to 3 months. Eligible employees can receive SSP for up to 28 weeks.
Is depression a disability under the Equality Act?
It can be. Depression is a disability under the Equality Act 2010 if it has a substantial and long-term adverse effect on someone's normal day-to-day activities. If the test is met, employers must consider reasonable adjustments and avoid discrimination, harassment or victimisation linked to the condition.
If a fit note says "may be fit for work", does the employee have to return?
Not necessarily. Discuss the advice with the employee and decide whether the suggested adjustments are practical. If they aren't, treat the fit note as "not fit for work" and continue to support the absence. Record your reasons.
Can you get a fit note for anxiety in the UK?
Yes. Any condition that affects someone's fitness for work can be certified on a fit note, including anxiety. The advice section can help you plan a supported return rather than a longer absence.
Is SSP paid from the first day of mental health absence?
Yes. Since 6 April 2026, eligible employees receive SSP from their first day of sickness absence, including absence for mental health reasons. SSP is paid at the standard weekly rate or 80% of average weekly earnings, whichever is lower.
Can an employer contact an employee who is off with stress?
Yes, but contact should be supportive and agreed in advance. Agree how often you'll be in touch and in what way, and avoid excessive contact, which can add to their stress. Keep the focus on wellbeing and support rather than work demands.
Can an employee return to work before their fit note ends?
Yes. An employee can return before their fit note ends if they feel able to and any necessary adjustments are in place. A return-to-work meeting will help you agree a safe plan.
Do we need medical evidence for the first week of absence?
No. Employees self-certify for the first 7 calendar days. From day 8, a fit note is required.
Wisdom Wellbeing
Wisdom Wellbeing is the UK and Ireland’s leading EAP provider. Specialising in topics such as mental health and wellbeing, they produce insightful articles on how employees can look after their mental health, as well as how employers and business owners can support their people and organisation. They also provide articles directly from their counsellors to offer expertise from a clinical perspective. Wisdom Wellbeing also writes articles for students at college and university level, who may be interested in improving and maintaining their mental wellbeing.
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