Quick answer: You can self-certify your absence for the first 7 calendar days in the UK, including weekends, so no doctor's note is legally required. From day 8 onward you need a fit note (form MED3) from a registered clinician. Your employer may still ask you to complete a self-certification form for that first week.
In the UK, you do not need a fit note for your first 7 days of sickness. You can self-certify this period by simply notifying your employer. From the 8th day, you must provide a fit note from a healthcare professional.
What changes on day 8
From day 8 a fit note becomes required. A registered clinician can issue one after an online review, and it counts for Statutory Sick Pay.
Who can issue a fit note
A doctor, registered nurse, pharmacist, physiotherapist or occupational therapist can all issue one since 2022.
Will my employer accept it
A fit note from a registered clinician is a valid medical certificate. Every certificate carries a unique reference number your employer can check to verify it.
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Frequently asked questions
Can I get a fit note on day 1 of my absence?
You can, but you usually don't need one. UK law lets you self-certify for the first 7 calendar days. Some employers ask for a note earlier as a matter of policy, so check your staff handbook.
Do weekends count towards the 7 days?
Yes. The 7 days are calendar days, so weekends and bank holidays are included.
What happens if I'm off longer than 7 days?
From day 8 you need a fit note from a registered clinician. It covers you for Statutory Sick Pay and satisfies your employer's evidence requirement.
Can my employer refuse a private fit note?
A fit note from a registered clinician is a valid medical certificate. For absences beyond 7 days it meets the legal requirement, though employer policy can vary for shorter absences.
