Should I use this page, or skip it?
Use this page if you work in the UK and need to know when a fit note is required, who can issue one, and what “may be fit for work” means. Skip it if you need emergency care — call 999 — or urgent medical advice via NHS 111. A fit note is paperwork about work, not a treatment.
Do not book a GP solely to collect a note during the first 7 calendar days of sickness. That slot is for people who need clinical care.
When do I need a fit note?
For the first 7 calendar days of sickness, employees usually self-certify. From day 8, an eligible healthcare professional can issue a fit note if your health affects fitness for work. The 7 days include weekends and non-working days, which is the detail most people miss.
Tell your employer according to workplace policy from day 1. Self-certification is a form your employer provides or a simple written statement — it is not an NHS document.
If you are too unwell to work and the absence will run past day 7, contact the team already managing the illness (GP, hospital clinic, or another eligible professional) rather than waiting until you collapse into an emergency appointment on day 8.
What happens on days 1 to 7?
Tell your employer and complete self-certification if they ask. GOV.UK guidance is that employers should not require a fit note for this period. Using a GP as a stamp for week-one absence blocks care for people who are actually ill.
You can still see a GP during those 7 days if you need medical care. The distinction is why you are there: symptoms, not stationery.
If the problem is an emergency, ignore the calendar and call 999. Fit-note rules do not override when to get help.
What happens from day 8?
Contact the service responsible for your care. After an appropriate assessment, a fit note can be issued digitally. It may say you are not fit for work, or that you may be fit with adjustments.
Eligible issuers include doctors, registered nurses, occupational therapists, pharmacists and physiotherapists, within their scope. Not every professional you meet can certify every situation. If the person treating you cannot issue a note, they should say who can.
A note can be backdated when the clinician can reasonably assess the earlier period. That is a clinical judgement, not a right. Do not expect a note for a week nobody assessed.
What does “may be fit for work” mean?
It means work might be possible with changes: altered hours, lighter duties, different equipment, or a phased return. It is not a demand that you go in tomorrow. You and the employer still have to agree something safe.
If the employer cannot make the adjustments, the note is treated as if it said you are not fit. Occupational health, where it exists, is often the practical next step for long or recurring absences.
Take the note to a GP appointment only if you also need clinical review — not as a second stamp.
Can I go back before the note expires?
Yes, if you are well enough and workplace safety is agreed. A separate “fit to return” note is not usually required. Staying off because the printed date has not arrived, despite feeling well, is a choice you should discuss with your employer, not a legal lock-in.
If going back would make you worse — especially with mental health or an injury that needs time — say so. That is a clinical conversation, not a toughness test.
Who should skip this page?
Skip this page if you need medical treatment rather than sick-pay evidence. Skip it if you are looking for benefits rules beyond a simple fit note — Universal Credit, ESA and insurance policies have their own evidence lists on GOV.UK.
This page cannot tell you whether your employer is acting lawfully in a dispute. ACAS and GOV.UK are the right next reads for that.
Fit-note rules are UK-wide. If you also need medical care, 111 works in England, Scotland (NHS 24) and Wales; Northern Ireland uses GP out-of-hours via nidirect. 999 is the same everywhere.
Sources were checked against the linked GOV.UK and NHS pages on 13 August 2026.
Common questions
- Can a fit note be backdated?
- It may be backdated when the clinician can make an appropriate assessment covering the earlier period, but this is not automatic.
- Who can issue a fit note?
- Doctors, registered nurses, occupational therapists, pharmacists and physiotherapists can certify within their scope after an assessment.
- What does 'may be fit for work' mean?
- It means work may be possible with changes such as altered hours, duties, equipment or a phased return, agreed with the employer.
- Do I need a fit note for the first week?
- Usually no. GOV.UK guidance is that employees can self-certify for the first 7 calendar days. An employer should not send you to a GP solely for an NHS note during that period.
- Can I go back to work before the note ends?
- Yes, if you are well enough and any workplace safety issues are agreed. A separate 'fit to return' note is not usually required.
- What if I am self-employed?
- Statutory sick pay rules for employees do not apply in the same way. You may still need medical evidence for insurance or benefits — check those schemes rather than assuming an NHS fit note is the only document.
- Will the note list my diagnosis?
- It should cover the functional impact and expected duration. It does not have to disclose every clinical detail. Ask if you are worried about what your employer will see.