Sick Notes and Fitness to Work

Introduction

The Statement of Fitness for Work, universally known as the fit note, replaced the traditional 'sick note' in the UK in 2010, reflecting a deliberate shift in emphasis: from simply certifying incapacity to actively considering whether and how a patient might return to some form of work, with adjustments, rather than defaulting to complete absence.¹

This is examined as both a practical, procedural topic (who needs a fit note, what it must contain, who can issue one) and a conceptual one (the evidence-based case for why 'good work' is usually a health-promoting outcome rather than something to be avoided by default while unwell).

Self-certification versus the fit note

Completing the fit note

The clinician assesses the patient's functional capacity in relation to their usual work, and selects one of two options - there is no longer a straightforward binary of 'fit' versus 'unfit' without modification.

The 'may be fit' option allows the clinician to tick suggested adjustments - a phased return, altered hours, amended duties, or workplace adaptations - which the employer and employee can then discuss. If the employer cannot accommodate any of the suggestions, the note is treated as 'not fit for work' by default; the clinician does not need to reissue it.

• A fit note should state the assessment period it covers - typically short for the first note in a new episode, allowing timely review, with longer periods reasonable for stable, long-term conditions
• It should record the diagnosis or functional problem, in terms the patient consents to being shared with their employer where relevant
• It can be backdated by up to 1 month from the date of assessment where clinically appropriate, but should not be issued for a future assessment that has not yet occurred
• Fit notes can be issued after a telephone or video consultation where an in-person assessment is not necessary to make a safe judgement

Who can issue a fit note

Since 2022, fit notes can be legally issued not only by doctors but also by registered nurses, occupational therapists, pharmacists and physiotherapists, reflecting the wider multidisciplinary team's role in assessing functional capacity and reducing pressure on GP appointments for what is fundamentally an administrative, not always medically complex, task.²

The evidence base: work as a health outcome

The philosophy underlying the fit note reform draws on a substantial evidence base - summarised influentially by Waddell and Burton's independent review for the UK government - that good work is generally beneficial for physical and mental health, and that long-term worklessness is associated with worse health outcomes, not better ones, for most conditions.³

• Prolonged absence from work is associated with de-conditioning, social isolation, loss of routine and purpose, and reduced likelihood of ever returning to work the longer it continues
• For many common conditions - musculoskeletal pain, mild-to-moderate mental health conditions - remaining engaged with modified or reduced work, where feasible, produces better outcomes than complete rest
• This does not mean work is always appropriate - severe illness, safety-critical roles with genuine incapacity, or conditions actively worsened by specific work exposures still warrant being signed unfit

Clinical judgement, not patient entitlement

A patient cannot demand a fit note as a right; it reflects the clinician's own professional assessment of functional capacity, and a clinician is entitled to decline to issue one if their assessment does not support it. This can be a difficult consultation, and is best handled by explaining the clinical reasoning directly rather than either capitulating to pressure or refusing without explanation.

Fit notes for common scenarios

Applying the 'may be fit' principle concretely differs by presentation, and thinking in terms of function rather than diagnosis is what separates a good fit note from a reflexive one.

Occupational health

Occupational health services, where available through an employer, are the appropriate route for complex, recurrent, or workplace-specific fitness questions - assessing whether a specific job role can be safely resumed, advising on reasonable workplace adjustments under the Equality Act 2010, and managing ill-health retirement processes. GPs are not expected to have detailed knowledge of a patient's specific workplace and should refer or signpost to occupational health rather than attempting to resolve complex return-to-work planning alone.

Under the Equality Act 2010, employers have a duty to make reasonable adjustments for employees with a disability, which can include many chronic health conditions - awareness of this can usefully inform the adjustments suggested on a 'may be fit' note.⁴

Safety-critical roles

Students, the self-employed, and those without a traditional employer

The fit note system is built around the employee/employer relationship, but clinicians are frequently asked to provide similar functional assessments for people outside it.

• Self-employed people are not entitled to Statutory Sick Pay and may instead need supporting evidence for other benefits (such as Employment and Support Allowance) - a fit note can still be provided and is often used for this purpose
• Students may need a letter supporting extenuating circumstances or adjusted deadlines rather than a standard fit note, and universities often have their own forms - clarify what is actually being requested rather than assuming a fit note is the right document
• Unemployed people seeking to demonstrate limited capability for work as part of a benefits claim may need a fit note or a specific capability assessment, which follows a different, DWP-defined process from routine sickness certification

Statutory Sick Pay

Statutory Sick Pay (SSP) is a separate, employer-administered payment made to eligible employees during certified sickness absence, subject to earnings and duration criteria set by the Department for Work and Pensions. The GP's role is limited to providing an honest clinical assessment of fitness for work via the fit note - eligibility for and calculation of SSP itself is an employer/DWP administrative matter, not a clinical decision.

Supporting a return to work

The 'may be fit' option is only useful if the suggested adjustments are ones an employer can realistically implement, so it helps to know the standard options and to name them specifically rather than leaving the box blank or writing something vague.

The longer someone is off work, the less likely they are ever to return - the probability falls markedly after around six months of continuous absence. This is the practical argument for keeping some contact with work where possible, considering a phased return earlier rather than later, and reviewing fit notes actively rather than reissuing them by default. Encouraging a patient to stay in touch with their manager during a longer absence is a small intervention with a meaningful effect on eventual return.

Common pitfalls

• Issuing 'not fit for work' by default without considering whether 'may be fit' with modification would be more appropriate and beneficial
• Issuing fit notes unnecessarily for absences under 7 days that only require self-certification
• Backdating a fit note beyond what is clinically justifiable
• Declining to have an honest conversation when a request seems disproportionate to the clinical findings, rather than simply issuing the note to avoid conflict
• Failing to signpost to occupational health for complex or recurrent workplace fitness questions

Summary

The fit note system exists to translate a clinical assessment of functional capacity into a practical statement an employer can act on, with an explicit bias towards supporting a safe return to modified work over default prolonged absence, grounded in evidence that good work is usually beneficial for health. The GP's task is an honest clinical judgement, communicated clearly, not an administrative rubber stamp.

Handled well, a fit note consultation is an opportunity to discuss recovery, function and realistic goals with the patient, rather than a brief administrative interruption to an otherwise clinical appointment - and the conversation about what a patient can and cannot yet do is often as therapeutically useful as the document itself.