Fit Note for One Day in the UK | Do You Need a Sick Note? (2026)

Last Updated: May 2026

Many employees in the UK wonder whether they need a fit note for just one day off work. In most cases, a one-day illness absence can be handled through self-certification, meaning a doctor’s note or fit note is usually not required straight away.

However, some employers may request medical evidence earlier under workplace policy, especially where there are repeated absences or absence management procedures in place.

Understanding when a fit note is required can help employees avoid workplace disputes and ensure employers follow UK employment rules correctly.

This guide explains:

• Whether you need a fit note for one day in the UK
• The difference between self-certification and fit notes
• When employers can request medical evidence
• How Statutory Sick Pay (SSP) affects certification
• When online fit notes may be used
• Your rights and responsibilities under UK workplace practices

Quick Answer: Do You Need a Fit Note for One Day in the UK?

Usually not.

In the UK, employees can generally self-certify sickness for the first 7 calendar days of illness absence without needing a fit note from a doctor or other healthcare professional.

In many workplaces:

• Short absences are handled through self-certification
• A fit note is usually requested after 7 days
• Some employers may request earlier evidence under workplace policy

Because rules vary between employers, the exact requirements usually depend on:

• Your employment contract
• HR policies
• Staff handbook
• Absence management procedures

What Is a Sick Note or Fit Note in the UK?

In the UK, the official term for a sick note is usually a fit note or Statement of Fitness for Work.

Official NHS fit notes are commonly issued using a Med 3 form, which confirms whether someone:

• Is not fit for work, or
• May /be fit for work with adjustments

Fit notes are commonly used for:

• Employer sickness records
• Statutory Sick Pay (SSP) purposes
• Longer-term sickness absence
• Occupational health assessments

Fit notes may be issued by appropriately registered:

• Doctors
• Nurses
• Occupational therapists
• Pharmacists
• Physiotherapists

Depending on the healthcare setting and assessment type.

Explore our detailed guide on what is a fit note in the UK.

Self-Certification in the UK

Self-certification allows employees to report short-term illness absences without needing a fit note.

Instead of providing medical evidence immediately, employees usually:

• Inform their employer they are unwell
• Follow workplace absence procedures
• Complete a self-certification form if required when returning to work

In the UK, self-certification normally covers:

• The first 7 calendar days of illness absence

This includes weekends and non-working days.

Many employers accept self-certification for:

• Colds and flu
• Stomach bugs
• Migraines
• Minor infections
• Short-term stress-related illness

Read our full guide to self-cert fit notes in the UK.

Typical Workplace Policies

In many UK workplaces:

However, some employers may request earlier evidence:

• After repeated short absences
• Before or after holidays or weekends
• Under absence monitoring procedures

Always check:

• Your employment contract
• HR policy
• Staff handbook

When Employers Can Request a Fit Note for One Day

Although employees can usually self-certify for 7 days, employers may sometimes request evidence earlier under workplace policy.

Situations where employers may request a fit note sooner can include:

• Repeated short-term absences
• Absences linked to weekends or bank holidays
• Ongoing absence management procedures
• Concerns about attendance patterns
• Contractual workplace rules requiring earlier evidence

However, employers cannot normally force NHS GPs to provide free fit notes during the standard self-certification period.

In some situations, employees may need to arrange:

• A private GP consultation
• An online GP appointment
• Other medical evidence requested under company policy

Do You Need a Fit Note to Get Statutory Sick Pay (SSP)?

Not necessarily during the first 7 days.

For SSP purposes:

• Employees usually self-certify initially
• Employers can request a fit note after 7 calendar days

Eligible employees may qualify for SSP if they are unable to work due to illness.

SSP is paid by employers, although some workplaces also provide enhanced contractual sick pay schemes.

Read our full guide to whether you need a fit note for SSP from day one in the UK.

Examples of One-Day Sick Leave Situations in the UK

Scenario 1: One-Day Illness Under Standard Self-Certification

An employee takes one day off with flu symptoms.

Employer policy:

• Allows self-certification for short absences

Result:

• No fit note usually required

Scenario 2: Repeated One-Day Absences

An employee frequently takes single-day absences.

Employer may:

• Monitor attendance patterns
• Request return-to-work meetings
• Ask for earlier medical evidence in future

Scenario 3: Absence Before a Bank Holiday

An employee calls in sick before a long weekend.

Some employers may:

• Request additional evidence
• Apply stricter absence monitoring rules

This depends on workplace policy.

Scenario 4: Contract Requires Earlier Medical Evidence

Some employment contracts or workplace procedures require earlier medical documentation.

Result:

• Employee may need to obtain medical evidence sooner than standard self-certification rules

Can You Get a Fit Note Online in the UK?

Yes.

Many healthcare providers now offer online fit notes through:

• phone consultations
• Video appointments
• Digital GP services

Typical process:

1. Book an appointment
2. Discuss symptoms with a healthcare professional
3. Receive a digital fit note if medically appropriate

Online consultations are commonly used for:

• Minor illness
• Respiratory infections
• Migraines
• Stress or anxiety
• Stomach illnesses

However, healthcare professionals must still decide whether a fit note is clinically appropriate.

Here’s our guide on how to get an online fit note in the UK.

Are Online Fit Notes Legal in the UK?

Yes, online fit notes are legal if they are:

• Issued after a genuine medical assessment
• Provided by an appropriately registered healthcare professional
• Based on proper clinical judgement

Avoid:

• Instant fit note websites with no consultation
• Editable templates sold online
• Unregulated providers

Employers may question suspicious or unverifiable documents.

Read more about how to recognise a legally valid fit note in the UK.

What Happens if You Do Not Provide a Fit Note?

If your employer reasonably requests medical evidence under workplace policy and you do not provide it, the absence may potentially be treated as:

• Unauthorised leave
• Unpaid absence
• A disciplinary matter under company procedures

This depends on:

• Workplace policy
• Employment contracts
• The circumstances of the absence

Employees should always follow:

• Reporting procedures
• Notification deadlines
• Absence management rules

Employer Sick Leave Policies in the UK

Employers can create their own sickness absence policies provided they comply with employment law, discrimination law, and statutory sick pay rules.

Policies often include:

• How illness should be reported
• When fit notes are required
• Self-certification procedures
• Return-to-work requirements
• Absence monitoring procedures

Some employers offer:

• Enhanced sick pay
• Occupational health support
• Flexible return-to-work arrangements

Key Takeaways

A fit note for one day in the UK is usually not required because employees can generally self-certify illness for the first 7 calendar days.

Key points to remember:

• Most short absences are handled through self-certification
• Employers may request earlier evidence under workplace policy
• Fit notes are usually required after 7 days
• SSP normally starts with self-certification
• Online fit notes are legal if properly issued
• Workplace absence policies can vary significantly

Because workplace rules differ, employees should always review:

• Employment contracts
• HR guidance
• Staff handbooks

To understand exactly what evidence may be required.