Can an Employer Override a Fit Note?
No. An employer cannot directly override a doctor's fit note in the UK. A fit note is expert medical evidence of an employee's fitness for work. While the fit note is not technically legally binding, overriding it without proper justification carries serious legal risks, including claims for unfair dismissal and disability discrimination under the Equality Act 2010.
This is one of the most commonly misunderstood areas of UK employment law. The fit note (officially called the Statement of Fitness for Work) represents a registered healthcare professional's clinical opinion. Employers are expected to take it at face value unless there are strong, documented reasons to question it.
That said, employers are not entirely powerless. UK employment law gives employers specific routes to challenge or seek clarification on a fit note, provided they follow a fair and transparent process. This guide sets out what employers can and cannot do, the legal risks involved, and the practical steps for handling disputed fit notes.
fit notes issued electronically in primary care in England in a year
of them said only "not fit for work", suggesting no adjustments
were issued by doctors rather than other healthcare professionals
Figures published by the Department of Health and Social Care and the Department for Work and Pensions on 11 July 2025. They matter to this question because the great majority of fit notes contain no adjustments to negotiate over. In most disputes the note either stands as written, or the employer has to challenge it through one of the routes set out below.
What a Fit Note Is and Why It Matters
A fit note, formally known as the Med3 form, is a medical document issued by a registered healthcare professional that provides their clinical opinion on a patient's fitness for work. It was introduced in 2010 to replace the traditional sick note, shifting the focus from what an employee cannot do to what they may be able to do with support.
A fit note will state one of two things:
- "Not fit for work" for a specified period. This is medical evidence that the employee is not currently fit for work. They should not be pressured to return, but may return earlier if they feel well enough and the employer has discussed health and safety with them.
- "May be fit for work" taking into account specific advice. The healthcare professional may recommend adjustments such as altered hours, amended duties, workplace adaptations, or a phased return.
Fit notes can be issued by GPs, hospital doctors, nurses, occupational therapists, and physiotherapists. Pharmacists may also issue fit notes where they are suitably trained and have Med3 access, although most community pharmacists do not currently issue them. These rules were expanded by the Social Security (Medical Evidence) and Statutory Sick Pay (Medical Evidence) (Amendment) (No. 2) Regulations 2022 (SI 2022/630), which came into force on 1 July 2022. Midwives are not on the list of authorised signatories.
An employer can only ask for a fit note once an employee has been off sick for more than 7 days in a row, including non-working days such as weekends and bank holidays. For absences of 7 days or less, self-certification is sufficient. A fit note is also not the only evidence an employer may accept. GOV.UK guidance for employers states that if the employer agrees, the employee can give another appropriate form of evidence instead of a fit note.
What Employers Can and Cannot Do
An Employer CAN
- Ask the employee to attend an occupational health assessment
- Request clarification from the issuing healthcare professional (with the employee's consent)
- Discuss workplace adjustments with the employee if the fit note says "may be fit for work"
- Keep in regular contact with the employee about their health and expected return
- Ask for a new fit note when the current one expires
- Seek a second medical opinion through an independent occupational health provider
- Request the employee's consent to obtain medical reports or records
An Employer CANNOT
- Pressure or require an employee to return against medical advice without a proper risk assessment, discussion, and documented justification
- Withhold Statutory Sick Pay simply because they disagree with a fit note, or because a fit note arrived late
- Demand to see the employee's detailed medical records without consent
- Treat a valid fit note as a reason for dismissal in itself, without a fair capability process
- Ignore recommended adjustments without considering the Equality Act 2010
- Require the employee to provide additional medical evidence beyond the fit note for SSP purposes without the employee's consent
Key Distinction
Government guidance states that employers should accept a fit note at face value. An employer can request that an employee undergo further medical assessment and can ask the employee's consent for medical reports, but for SSP purposes the employee cannot be required to provide additional medical evidence beyond the fit note itself. If an employer discontinues SSP because they doubt the fit note's validity, the employee is entitled to a written statement of reasons and can seek a determination from HMRC.
What an Employer Should Do Instead
Fit note disputes tend to go wrong at the same moment. The employer has a real concern, reaches for the quickest way to act on it, and picks a route that is not open to them. The table below pairs the common instinct with the route that is.
| What the employer wants to do | Where that stands | What to do instead |
|---|---|---|
| Tell the employee to come in anyway | Not open to them while a valid fit note says the employee is not fit for work | Where the note says "may be fit for work", discuss the recommended adjustments, including a phased return. If none can reasonably be accommodated, the note is treated as though it says "not fit for work" |
| Stop sick pay because they doubt the note | Disagreeing with a fit note is not by itself a lawful reason to withhold Statutory Sick Pay | If SSP genuinely is not payable, give the employee form SSP1 with written reasons. The employee can then ask HMRC to determine entitlement |
| Telephone the GP to check the note | Only with the employee's explicit consent, and a GP will not disclose anything without it | Ask the employee to consent to a medical report, or refer them to occupational health |
| Prefer their own occupational health report over the GP's note | Neither report automatically outranks the other | Discuss the conflict with the employee, document why one is preferred, and keep that reasoning on file |
| Ask to see the diagnosis or the medical records | Not without consent. A fit note does not have to state a diagnosis | Accept the note at face value and ask occupational health for an opinion on fitness for the specific role |
| Start disciplinary action over the absence itself | Absence covered by a valid fit note is not misconduct | Where capability is the real concern, follow a fair capability procedure supported by medical evidence |
| Ask for a fit note in the first week of absence | They can ask, but the first 7 days are covered by self-certification and a healthcare professional may decline to issue one that early | Accept self-certification. GOV.UK guidance is that an employer who insists on medical evidence in that first week should cover the cost of obtaining it |
Occupational Health vs GP Fit Note
If an employer has reasonable grounds to question a fit note, the most appropriate route is to refer the employee for an occupational health (OH) assessment. Occupational health professionals specialise in workplace fitness and can provide a more detailed assessment of how a medical condition affects an employee's ability to do their specific job.
| Feature | GP Fit Note | Occupational Health Report |
|---|---|---|
| Who issues it | GP, hospital doctor, nurse, OT, physiotherapist (pharmacist where suitably trained) | Occupational health practitioner (specialist in workplace fitness) |
| Focus | General fitness for work based on clinical condition | Fitness for the employee's specific role, tasks, and workplace |
| Who requests it | The employee (from their healthcare provider) | The employer (with the employee's consent) |
| Legal weight | Expert medical evidence, should be accepted at face value | Expert workplace-specific medical evidence, which a tribunal may weigh alongside the fit note depending on how thorough the assessment was |
| Cost | Free via NHS (after 7 days' sickness) | Paid by the employer |
| Can it override the other? | N/A | Not automatically. If OH and GP disagree, the employer needs strong documented reasons for preferring one over the other |
If an occupational health report disagrees with a GP's fit note, the employer should tread carefully. No rule makes one report automatically outrank the other, but an employer that prefers the OH report is expected to be able to explain and document why. An employment tribunal would look at whether the decision was reasonable on the evidence available at the time, and simply selecting whichever opinion is more convenient is unlikely to survive that scrutiny.
When a Fit Note Says "May Be Fit for Work"
A fit note that states the employee "may be fit for work" is not the same as a fit note that says they are "not fit for work." This category specifically means the healthcare professional believes the employee could return to work if the employer makes certain adjustments.
Common adjustments recommended in fit notes include:
- Amended duties (lighter tasks, no heavy lifting, no driving)
- Altered hours (shorter shifts, later start times, reduced working week)
- Workplace adaptations (ergonomic equipment, ground-floor workspace, quiet environment)
- A phased return (gradually increasing hours over a set period)
The employer's obligation is to consider these adjustments and discuss them with the employee. If the employer cannot reasonably accommodate the recommended adjustments, the fit note should be treated as though it says "not fit for work" and the employee remains off sick.
If the employee does return under a "may be fit for work" recommendation, they may need a fit-to-work certificate to formally document the return-to-work conditions and any adjustments agreed.
Equality Act 2010: Reasonable Adjustments
If the employee's condition qualifies as a disability under the Equality Act 2010 (a physical or mental impairment that has a substantial and long-term adverse effect on their ability to carry out normal day-to-day activities), the employer has a legal duty to make reasonable adjustments. Failing to properly consider reasonable adjustments when a fit note recommends them may create disability discrimination risk. The adjustments must be reasonable, but the employer must demonstrate they have genuinely assessed what is possible rather than dismissing the recommendations without consideration.
Legal Risks of Overriding a Fit Note
Employers who override, ignore, or act in contradiction to a fit note expose themselves to several categories of legal risk. Employment tribunals take medical evidence seriously, and the burden falls on the employer to demonstrate that any decision to depart from a fit note was reasonable and properly supported.
Unfair Dismissal
Dismissing an employee who has a valid fit note, or disciplining them for not attending work while signed off, can give rise to an unfair dismissal claim. Even where the employer believes the employee is capable of working, the fit note provides the medical evidence that the employee relied upon in remaining absent. An ordinary unfair dismissal claim currently requires two years of continuous service. Section 25 of the Employment Rights Act 2025, commenced by SI 2026/559, reduces that qualifying period to six months from 1 January 2027. Discrimination claims under the Equality Act 2010 have no qualifying period at all. ACAS guidance is not law in itself, but employment tribunals take it into account, and it recommends that employers follow a fair process before any capability-related dismissal, including obtaining independent medical evidence and exploring reasonable alternatives.
Disability Discrimination
If the employee's health condition amounts to a disability under the Equality Act 2010, failing to properly consider adjustments recommended in a fit note may create disability discrimination risk. A failure to make reasonable adjustments is a standalone form of discrimination and does not require the employee to show that the employer intended to discriminate. The employer must demonstrate they genuinely considered what was possible.
Breach of Duty of Care
Employers have a common law and statutory duty of care to protect the health and safety of their employees. Pressuring an employee to return to a role or manner of work that a healthcare professional has said they are unfit for, without a proper risk assessment and discussion, could constitute a breach of that duty, particularly if the employee's condition worsens as a result.
SSP Disputes
If an employer withholds Statutory Sick Pay because they disagree with a fit note, the employee can seek a formal determination from HMRC. The employer must give the employee form SSP1 setting out why SSP is not payable, and the employee can appeal to HMRC. From 6 April 2026, SSP is paid at £123.25 a week or 80% of the employee's average weekly earnings, whichever is lower. Waiting days were abolished on the same date, so SSP is payable from the first qualifying day of absence and for up to 28 weeks. Enforcement of SSP remains with HMRC. The Fair Work Agency, which launched on 7 April 2026, is expected to take on statutory sick pay enforcement at a later stage, anticipated from 2027.
Common Scenarios
Employee Has Repeated Short-Term Absences with Fit Notes
An employer notices a pattern of frequent short absences, each supported by a fit note. The employer cannot ignore individual fit notes, but can invite the employee to an occupational health assessment to understand any underlying condition. If a pattern emerges, the employer may address it through their absence management policy, provided they follow a fair procedure and consider any Equality Act duties.
GP Fit Note and Occupational Health Report Disagree
A GP signs an employee off as "not fit for work" for four weeks. The employer's occupational health provider examines the employee and concludes they could return to modified duties. The employer cannot simply override the GP's fit note. They should discuss the OH findings with the employee, explore whether modified duties are genuinely available and suitable, and document the process. If the employee declines to return based on their GP's advice, the employer should continue to pay SSP and request updated medical evidence at the appropriate time.
Employer Suspects the Fit Note Is Not Genuine
If an employer has specific, evidence-based reasons to believe a fit note is fraudulent (not merely that they disagree with the medical opinion), they may investigate through proper channels. This does not extend to confronting the employee's GP directly. The employer should refer the employee to occupational health and, if fraud is suspected, follow their disciplinary process with legal advice. Genuine fraud involving a fit note is rare and must be clearly distinguished from a difference of medical opinion.
Fit Note Expires and the Employee Does Not Provide a New One
When a fit note expires, the employer is entitled to ask the employee for a new one if they are still off sick. GOV.UK guidance for employers is clear that SSP cannot be withheld just because a fit note arrives late, since the delay is often down to appointment availability. If no further medical evidence is provided at all, the employer may conclude that entitlement has not been established, but it should first tell the employee in writing what evidence it needs and give a fair opportunity to obtain it. If SSP is then stopped, the employee must be given form SSP1 and can ask HMRC to decide the matter.
Flashpoints That Are Not About the Note Itself
Many fit note disputes are really arguments about something adjacent to the note: how often the employer rings, whether a holiday can be booked, whether work can be sent over. These are the points at which an employer most often decides, wrongly, that the note cannot be genuine.
How Much Contact the Employer Can Have
There is no fixed limit. ACAS guidance is that the employer and employee should agree how often contact happens, how they will contact each other, and who the employee will be in contact with, and that what is appropriate depends on the individual's circumstances. Contact is a legitimate chance to check on wellbeing and to plan cover. Where someone is off because of a mental health problem, ACAS asks employers to agree the purpose, type and level of contact so that it is useful rather than overwhelming, and notes that the employee may find contact difficult and prefer it to go through someone else.
Being Asked to Do Work While Signed Off
A fit note that says "not fit for work" is medical evidence that the employee is not fit to do their job. No statutory rule sets out how much work, if any, may be asked of someone who is signed off, so this falls back on what is reasonable and on the contact arrangements the two sides have agreed. Answering the occasional handover question is a very different thing from being sent a workload, and an employer that sends work across is undermining the same note it is relying on to manage the absence.
Booking a Holiday While Signed Off
This is the most common single trigger for an employer concluding that a fit note must be wrong, and it is misplaced. ACAS is explicit that a worker can use paid annual leave while off sick, for example where they are not physically able to work but are able to take a holiday, or where they are off sick long term and a holiday might help their recovery. It is for the worker to request it, and an employer cannot force a worker to take holiday while off sick. If the request is approved, sick leave can be paused, the worker receives holiday pay for that period, and sick leave continues afterwards if they are still not well enough to return.
Falling Ill During a Booked Holiday
A worker who becomes ill during a holiday must report the sickness to their employer if they want that time treated as sick leave. Where they do, they can receive Statutory Sick Pay for the days they were ill, provided they are entitled to it, and keep those holiday days to use another time.
Holiday Building Up During Long-Term Sickness
Holiday entitlement accrues as normal while someone is off work through sickness or injury. ACAS treats sick leave as long term once it has lasted more than 4 weeks. A worker who has been unable to use their holiday because of long-term sick leave can carry over 4 weeks of unused entitlement, or more where the employer allows it, and that carried-over holiday must be used within 18 months of the date it was carried over.
Working a Second Job While Signed Off
A fit note is an opinion on fitness for the work the healthcare professional was told about, so being unfit for one role does not automatically mean being unfit for every kind of work. In practice, an employer who learns of a second job will usually treat it as grounds for an occupational health referral, and many contracts restrict outside work or require consent for it. Anyone in this position should check their own contract and take advice before assuming the two sit comfortably together.
What to Do if Your Employer Ignores Your Fit Note
Employees whose employers pressure them to return to work despite a valid fit note have several options.
- Communicate in writing. Confirm to your employer that you have a valid fit note and that your healthcare professional has advised you are not fit for work. Keep copies of all correspondence.
- Request clarification from your GP. If your employer has questioned the fit note, ask your GP or the issuing healthcare professional for a more detailed assessment or an updated fit note that addresses the employer's concerns.
- Raise a formal grievance. If your employer continues to pressure you to return or threatens disciplinary action, you can raise a formal grievance under your employer's grievance procedure. This creates a documented record.
- Contact ACAS. ACAS provides free advice on workplace disputes. If informal resolution fails, ACAS early conciliation is a required step before most employment tribunal claims, under section 18A of the Employment Tribunals Act 1996, with a small number of prescribed exemptions.
- Seek legal advice. If you believe you have been unfairly dismissed, discriminated against, or had your SSP withheld because your employer overrode your fit note, a solicitor specialising in employment law can advise on your options including tribunal claims.
Private Medical Certificates and Fit Notes
Employers may accept private medical certificates issued by GMC-registered doctors as medical evidence of illness, subject to their agreement. Private certificates can be useful where an employee cannot get a timely GP appointment, where a second medical opinion is needed to support the employee's case, or where medical evidence is needed during the first 7 days of sickness absence, before an NHS fit note can be issued free of charge. If the employer requires medical evidence in the first 7 days, GOV.UK guidance states that the employer should cover the cost.
Need Medical Evidence for a Workplace Dispute?
If your employer is questioning your fitness for work, a private medical certificate from a GMC-registered doctor can provide additional documented evidence of your condition. MedicalCert certificates are reviewed and signed by GMC-registered UK doctors, and, where medically appropriate, typically delivered same day or by 9AM the next morning.
Frequently Asked Questions
No, not directly. A fit note is expert medical evidence and employers are expected to accept it at face value. However, an employer can request an occupational health assessment or seek clarification from the issuing healthcare professional (with the employee's consent). Overriding a fit note without proper justification carries legal risks including unfair dismissal and disability discrimination claims.
Not simply for being off sick. An employer can potentially dismiss on grounds of capability if a long-term illness prevents the employee from doing their job, but only after following a full and fair process. This includes obtaining independent medical evidence, exploring reasonable adjustments, considering alternative roles, and giving the employee the opportunity to respond. An employee with the necessary qualifying service who is dismissed solely for taking time off covered by a valid fit note is likely to have a strong unfair dismissal claim.
If an occupational health report contradicts a GP's fit note, the employer cannot simply choose the more convenient opinion. They should discuss the conflicting evidence with the employee, consider whether the OH assessment was based on a thorough understanding of the employee's condition, and document their reasoning. If the employer decides to follow the OH report over the GP's fit note, they need strong, documented reasons. An employment tribunal may scrutinise this decision.
An employer should not withhold Statutory Sick Pay simply because they disagree with a fit note. If they do, the employee is entitled to a written statement of reasons and can seek a formal determination of entitlement from HMRC. Enforcement of SSP remains with HMRC. The Fair Work Agency, which launched on 7 April 2026, is expected to take on statutory sick pay enforcement at a later stage, anticipated from 2027. Contractual sick pay depends on the terms of the employment contract.
A fit note is not technically legally binding in the way a court order is. It is classified as expert medical evidence, and employers are expected to accept it at face value. However, disregarding a fit note without proper justification, particularly where the Equality Act 2010 applies, creates significant legal exposure. In practice, employment tribunals treat fit notes as strong evidence and expect employers to follow a fair process before departing from the medical advice they contain.
An employer can request clarification from the healthcare professional who issued the fit note, but only with the employee's explicit consent. Medical information is protected under UK data protection rules, and a GP will not disclose patient information to an employer without the patient's written permission. The employer cannot demand to see detailed medical records or diagnoses beyond what is stated on the fit note itself.
If an employer has specific, evidence-based reasons to suspect fraud (as opposed to simply disagreeing with the medical opinion), they should refer the employee to occupational health for an independent assessment. If genuine fraud is suspected, the employer should follow their disciplinary procedure with legal advice. Fit note fraud is rare and must be clearly distinguished from a legitimate difference of medical opinion between the GP and the employer's view.
Not necessarily. A fit note that says "may be fit for work" means your healthcare professional believes you could return if your employer makes the recommended adjustments. If your employer cannot reasonably accommodate those adjustments, the fit note is treated as though it says "not fit for work" and you remain off sick. Your employer should discuss the adjustments with you before making any decision.
Yes. A fit note does not prevent you from returning to work early if you feel well enough. GOV.UK fit note guidance for employers states that an employee can return to work at any time, even before their fit note expires, and does not need to go back to their healthcare professional first. You do not need a new fit note to go back. However, it is good practice to discuss your return with your employer first so that any health and safety considerations or workplace adjustments can be addressed before you start back.
Yes. ACAS guidance is that a worker can use their paid annual leave while off sick, for example where they are not physically able to work but are able to take a holiday, or where they are off sick long term and a holiday might help their recovery. It is for you to request the holiday, and your employer cannot force you to take holiday while off sick. If the request is approved, sick leave can be paused, you receive holiday pay for that period, and sick leave continues afterwards if you are still not well enough to return.
Yes. Holiday entitlement accrues as normal while you are off work because of sickness or injury. ACAS treats sick leave as long term once it has lasted more than 4 weeks. If you have not been able to use your holiday because of long-term sick leave, you can carry over 4 weeks of unused entitlement, or more if your employer allows it, and that carried-over holiday must be used within 18 months of the date it was carried over.
There is no fixed limit. ACAS guidance is that the employer and employee should agree how often contact happens, how they will contact each other, and who the employee will be in contact with, and that what is appropriate depends on the individual's circumstances. Where someone is off because of a mental health problem, ACAS asks employers to agree the purpose, type and level of contact so that it is useful rather than overwhelming, and notes that the employee may prefer contact to go through someone else.
No statutory rule sets out how much work, if any, can be asked of someone who is signed off, so it comes down to what is reasonable and to the contact arrangements agreed between you. A fit note saying you are not fit for work is medical evidence that you are not fit to do your job. Answering an occasional handover question is very different from being sent a workload, and an employer sending work across is undermining the same note it is relying on to manage your absence.
You must report the sickness to your employer if you want that time treated as sick leave rather than holiday. If you do, you can receive Statutory Sick Pay for the days you were ill, provided you are entitled to it, and keep those holiday days to use another time.
Official Sources
- GOV.UK: Getting the most out of the fit note (employer guidance)
- ACAS: Fit notes and proof of sickness
- ACAS: Keeping in touch during absence
- ACAS: Sick pay and holiday pay
- ACAS: Sickness and ending employment
- GOV.UK: Fit note volumes in primary care (DHSC and DWP, July 2025)
- GOV.UK: Statutory Sick Pay employer guide
- Equality and Human Rights Commission: Reasonable adjustments
