If you've woken up feeling too ill to work, here's the short answer: you can self-certify sick leave in the UK for up to 7 calendar days in a row. That means no doctor's note is needed for the first week off sick , you simply tell your employer you're unwell and, in most cases, fill in a short form when you return. Once you pass day 7, though, the rules change and you'll usually need a fit note from a GP or another authorised healthcare professional. Below, we'll walk through how the 7-day rule works, what to do if you're off longer, and where mental health, stress, and remote medical certificates fit into the picture.
Self-Certification
What Is Self-Certification?
Self-certification (often shortened to "self-cert") is the process of telling your employer you're too sick to work, without needing medical proof from a doctor. Under UK employment law, employees are trusted to report short-term sickness themselves for the first week of any absence. Your employer may ask you to complete an internal sickness form, phone in each morning, or fill out a government-style SC2 form , the exact process depends on your workplace's sickness absence policy.
The 7-Day Rule: Calendar Days, Not Working Days
This is where most people get confused, and it's worth getting right. The self-certification period covers 7 calendar days , including weekends and bank holidays , not 7 working days.
Here's a worked example. Say you wake up too ill to work on a Wednesday. Your 7-day self-certification window runs Wednesday through the following Tuesday, even though you might only have been scheduled to work three or four of those days. If you're still unwell on day 8 (that Wednesday), you now need a fit note from your GP, regardless of how many actual shifts you missed. Employers sometimes get this wrong too, so it's worth checking your contract or asking HR directly if you're unsure where your 7 days fall.
When Does the Self-Certification Period Start?
The clock starts on the first full day you're unable to work due to illness , not the day you report it. If you feel ill on a Friday evening after finishing work, day one of your sickness is typically the next day you're due to work, or the calendar day the illness began, depending on your employer's policy. When in doubt, report sickness as early as possible and ask your manager to confirm the start date they're recording.
Help Us Improve GOV.UK: Official Resources for Self-Certification
GOV.UK, Acas, and the NHS all publish guidance on self-certification, statutory sick pay, and fit notes, and it's worth knowing where to look:
- GOV.UK hosts the official SC2 form, which many employers accept as a standard self-certification template.
- Acas offers plain-English guidance for both employees and employers on sickness absence, fit note guidance, and workplace absence management.
- NHS resources explain how fit notes (Med3 forms) work and who is allowed to issue them.
- Citizens Advice can help if there's a dispute about sick pay eligibility or how your employer is applying the rules.
These sources are reliable for general rules, but they won't help you if you're stuck without a GP appointment and need a certificate quickly. That's a genuine gap for a lot of people , more on that below.
Frequently Asked Questions
How many days can I self-certify sick leave?
Up to 7 calendar days in a row. After that, most employers legally require a fit note to continue paying statutory sick pay (SSP) or company sick pay.
Do I get paid during self-certification?
Often yes, but it depends on your contract. SSP has "waiting days" , the first 3 qualifying days of sickness are usually unpaid unless you've been off sick within the last 8 weeks. Many employers also offer contractual sick pay that's more generous than SSP, so check your staff handbook or ask HR directly.
Can I self-certify for mental health, stress, or burnout?
Yes. Self-certification applies to any illness, including stress, anxiety, low mood, and burnout , not just physical symptoms like flu or a stomach bug. You don't need to disclose full details to your employer, though a brief, honest description ("stress-related illness" is enough) helps avoid confusion later. If mental health struggles continue past 7 days, a GP can issue a fit note covering "stress" or "anxiety" without requiring a lengthy assessment first.
Self-Certification vs Sick Note: Key Differences
People often use "sick note" and "self-certification" interchangeably, but they're not the same thing. Here's how they compare:
| Feature | Self-Certification | Fit Note (Sick Note) |
|---|---|---|
| Who provides it | The employee themselves | A GP, nurse, pharmacist, or other authorised professional |
| Maximum duration covered | First 7 calendar days of illness | Any length, as advised by the clinician |
| Medical evidence required | No | Yes |
| Typical form used | SC2 or employer's own sickness form | Med3 form |
| When it's used | Short-term illness (colds, flu, stress, minor injuries) | Illness lasting more than a week, or when employer requests evidence sooner |
One detail worth flagging: employers can ask for a fit note before day 8 if they choose, though they'll usually have to pay any GP fee themselves, since NHS fit notes for this purpose aren't always free before the 7-day mark. Most employers don't bother, since it costs them money and time, but it's technically allowed under their sickness absence policy.
Employer Rights During the Self-Certification Period
Employers have a fair amount of flexibility here, and it helps to know what they can and can't reasonably ask for:
- They can require a specific reporting process , for example, calling a manager by 9am rather than texting, or logging absence through an HR system.
- They can ask you to complete a self-certification form on your first day back, detailing the dates you were off and the reason.
- They can hold a return-to-work interview , which is standard practice and not a sign of distrust , it's mainly used to check you're fit to return and to spot recurring patterns of absence.
- They cannot demand a fit note for the first 7 days without covering any associated cost, and they can't refuse to accept a properly completed self-certification form.
- They can monitor recurring short-term absences , particularly if a pattern emerges (for instance, repeated single-day absences on Mondays), and may follow their own capability or disciplinary procedures if there's a genuine concern unrelated to illness itself.
Agency workers and zero-hours staff are entitled to the same self-certification rights as permanent employees, though SSP eligibility depends on average weekly earnings and continuous employment, so it's worth checking your specific contract.
Frequently Asked Questions
What if I'm off sick for longer than 7 days?
You'll need a fit note from a GP or another authorised clinician from day 8 onward. Without one, your employer can pause SSP and any contractual sick pay until you provide medical evidence.
What if I can't get a GP appointment in time?
This is a common problem, especially with same-day GP slots often booked out. If you're past day 7 and still waiting for an appointment, a licensed online medical certificate service can provide a properly issued fit note or medical certificate without the wait, so your pay and employment record aren't affected while you're stuck in a booking queue.
Can I self-certify more than once in a short period?
Yes, technically, but employers often flag frequent short-term absences for a return-to-work conversation. There's no legal cap on how many times you can self-certify, but repeated short absences may trigger your employer's attendance policy.
Does self-certification apply to colds and flu the same way as more serious illness?
Yes. The 7-day rule doesn't distinguish between a bad cold and a more serious condition. What matters is that you're genuinely unfit for work, not the specific diagnosis.
Final Takeaway
The rule is easy to remember once it clicks: you can self-certify sick leave in the UK for up to 7 calendar days, and after that, you'll need a fit note to keep things simple with your employer and your pay. Calendar days catch a lot of people out, so count weekends and bank holidays into your 7 days, not just your rostered shifts. And remember, self-certification isn't limited to colds and flu , mental health conditions like stress and burnout are covered too.
If you're past day 7, can't get a GP appointment in time, or simply need a fitness, travel, or sports certificate quickly, Get Medical Certificate offers a licensed, GDPR-compliant way to get the documentation you need online, without the wait for an in-person visit. It's a practical backup for anyone , employees, students, job applicants, or travellers , who needs a certificate fast and can't afford to sit in a GP waiting room queue.