Self-Certification for Sick Leave Explained: Rules, Forms & How It Works

Self-certification for sick leave is the process by which an employee declares their own illness or inability to work for up to seven calendar days without needing a GP-issued fit note. It is a widely used system in the UK that streamlines short-term absence management, reduces the burden on the NHS, and removes the need for employees to visit a doctor for minor illnesses. The system operates under Statutory Sick Pay (SSP) rules set by HMRC and the Department for Work and Pensions (DWP) (GOV.UK, SSP).

Self-certification matters because it affects every employer’s absence management process. It determines when an employer can require medical evidence, when SSP payments begin, and how short-term sickness absence is recorded.

Key Takeaways

• Self-certification covers absences of up to seven calendar days — no GP note is legally required during this period.
• Employers can request a fit note at any point during an absence, even within the first seven days, but are not required to do so.
• The SC2 form is the standard self-certification document, though employers can create their own.
• SSP waiting days mean the first three qualifying days of absence are unpaid regardless of self-certification.
• Self-certification does not apply to absence caused by pregnancy, workplace injury, or certain maternity-related conditions.

What Is Self-Certification?

Self-certification is a declaration by an employee that they are too unwell to attend work. It is not a medical diagnosis — it is an employee’s own assessment of their fitness to work.

In practical terms, when you are off sick for one to seven calendar days, you can confirm your absence to your employer without obtaining a fit note from your GP. The employer accepts your declaration and records the absence accordingly.

The self-certification period aligns with the government’s position that most short-term illnesses do not require medical intervention. Requiring a GP appointment for a two-day cold creates unnecessary pressure on NHS services and adds a financial burden on employees who would need to pay for a private consultation if NHS appointments are unavailable.

What Self-Certification Is Not

Self-certification is not a blank cheque. Employers can still:

• Require you to follow their internal absence reporting procedures (e.g., calling in on the first day of absence).
• Request a fit note earlier than day eight if they choose to.
• Investigate patterns of short-term absence through occupational health referrals.
• Treat frequent short-term absences as a conduct or capability matter if they suggest underlying issues not being addressed.

The 7-Day Rule Explained

The seven-day rule is the cornerstone of UK absence management. Here is how it works:

Day of Absence	What Happens
Day 1-3	Self-certification applies. SSP waiting days — no SSP is payable.
Day 4-7	Self-certification continues. SSP begins on the fourth qualifying day (first day after waiting days).
Day 8 onwards	Fit note required. SSP continues if eligibility criteria are met.

The seven-day period counts calendar days, not working days. If you fall ill on a Monday and your absence spans eight calendar days (including a weekend), you need a fit note covering the full period.

Key points about the seven-day rule:

• You do not need to visit a GP during the first seven days. Your self-certification is sufficient.
• Employers can waive the waiting days. Many companies pay from day one of absence through their enhanced sick pay policy.
• A fit note can be backdated. If you do see a GP within the first seven days, the GP can issue a fit note covering the full period from day one.
• The seven-day count resets after a return. If you return to work for a single day and then go off sick again, a fresh seven-day period begins.

The SC2 Self-Certification Form

The SC2 form is the traditional self-certification document used by UK employers. Despite its name, there is no official government-issued SC2 template — the term “SC2” comes from the historical Social Security (Contributions) Act and has become generic shorthand for any self-certification form.

A typical SC2 form includes the following fields:

Field	Details
Employee name	Full name as on payroll
National Insurance number	Used for SSP calculations
Date of birth	Employee’s date of birth
Date sickness began	First day of absence
Date of return to work	Expected or actual return date
Reason for absence	Brief, non-specific description (e.g., “illness”)
Declaration	Signed statement confirming accuracy

Many employers have replaced the paper SC2 with digital absence forms integrated into their HR systems. The form can be completed online, emailed, or submitted through an absence management platform.

Can an Employer Create Their Own Form?

Yes. There is no statutory requirement to use any specific self-certification form. Employers are free to design their own, provided they capture the essential information needed for absence records and SSP calculations. Some organisations include additional fields such as:

• Whether the employee was seen by a doctor during the seven-day period.
• Whether the absence is related to a workplace injury or accident.
• Any adjustments the employee believes would help on return.

SSP Implications of Self-Certification

Statutory Sick Pay is the minimum payment an employer must make to an eligible employee during sickness absence. Self-certification directly affects how and when SSP is calculated:

Eligibility for SSP:

• You are an employee (not self-employed).
• You earn at least £123 per week (2025/26 rate) before tax.
• You have been off sick for at least four consecutive calendar days (including non-working days).

How SSP is paid:

• The first three qualifying days of absence are unpaid (waiting days).
• SSP is paid from the fourth qualifying day at £116.75 per week (2025/26 rate).
• For a seven-day absence, you receive SSP for days 4-7 (four days’ worth at the weekly rate).
• For an eight-day absence requiring a fit note, you receive SSP for days 4-8.

Self-certification and SSP together: During the self-certification period (days 1-7), you are confirming your illness without medical evidence. Your employer processes SSP based on your declaration. From day 8, the fit note replaces your self-certification as the basis for continued SSP payments.

If your employer pays enhanced sick pay above SSP, they can set their own terms for evidence during the self-certification period. Some require a fit note from day one; others accept self-certification without question.

Employer Best Practices for Self-Certification

Managing self-certification effectively requires clear policies and consistent procedures:

1. Have a clear sickness absence policy. Document the self-certification process, what evidence is required, and when fit notes become mandatory. Communicate this to all employees during onboarding.
2. Accept self-certification without excessive scrutiny. For genuine short-term illness, requiring a GP note within the first seven days is counterproductive. It wastes NHS resources and erodes trust.
3. Track absence patterns, not individual absences. Three separate one-day absences over six months may indicate a different issue than a single eight-day illness. Use absence data to identify employees who may need support.
4. Use return-to-work conversations. After any period of self-certified absence, conduct a brief return-to-work discussion to confirm the employee is fit and identify any underlying issues.
5. Ensure your HR system captures self-certifications digitally. Paper forms are harder to audit and easier to lose. Digital absence management reduces admin burden and provides a clear audit trail.

Frequently Asked Questions

Can my employer force me to get a GP note before day 8?

Yes, technically. There is no legal prohibition on an employer requesting a fit note at any point during an absence. However, requesting one within the first seven days is generally considered poor practice. The NHS recommends that employees only seek a GP fit note if they have been off for more than seven days, and requesting one earlier adds pressure to an already overstretched service.

Does self-certification apply if I work part-time?

Yes. Self-certification is based on calendar days, not working days. If you are off sick for seven calendar days and work three days per week, you still self-certify. The seven-day rule applies equally regardless of your work pattern.

Can I self-certify for a recurring condition?

Yes. If you have a condition that causes intermittent short-term absences (e.g., migraines, IBS), you can self-certify each time you are off for seven days or fewer. However, frequent short-term absences may trigger an occupational health referral if your employer has a policy for managing persistent short-term sickness.

What if my employer refuses to pay SSP during self-certification?

If you are eligible for SSP and have been off for four or more consecutive days, your employer must pay SSP from the fourth qualifying day regardless of whether you self-certify or provide a fit note. Refusing to pay SSP is a breach of employment law and can be reported to HMRC’s Statutory Payment Dispute Team.

Does self-certification apply to agency workers?

Yes, agency workers are eligible for SSP after meeting the qualifying criteria (13 weeks of continuous employment with the same employer). Self-certification applies during the first seven days of absence, the same as for permanent employees.

This article is general information, not legal advice. Consult a qualified employment lawyer for guidance on your specific jurisdiction and circumstances.