Overtime pay in the UK (2026): Rates, unpaid overtime, and employee rights

Unpaid overtime is legal in the UK, but only under strict conditions. If you work extra hours, your employer must still pay you enough so your average hourly rate stays above the National Minimum Wage (£12.71/hour for age 21+). Work regular overtime and it may become a binding contract term. The law also caps your working week at 48 hours on average. Consult a qualifying employment solicitor to assess procedural timelines and settlement risk before negotiation.

This guide explains when unpaid overtime is lawful, when it’s a breach, and how to claim back-pay through the employment tribunal.

Is overtime pay required by law in the UK?

Overtime pay is not automatically required by law; employers have no statutory obligation to pay extra rates for hours beyond the contract.

• No legal right to overtime pay exists under English employment law (Employment Rights Act 1996; GOV.UK guidance).
• Payment obligation is determined solely by written contract, implied contractual term (developed through conduct), or minimum wage compliance.
• Employers must state overtime rates and conditions in the written employment statement of particulars if offered (Employment Rights Act 1996, section 1).
• The single legal floor is average hourly pay: across all hours worked (contracted + overtime), it must not fall below National Minimum Wage (National Minimum Wage Act 1998).
• Voluntary overtime performed occasionally remains non-binding unless accepted repeatedly, at which point it may become an implied contractual obligation.

When must employers pay overtime? Contractual vs unpaid overtime

Overtime becomes a binding payment obligation when it is contractual (written in the employment agreement) or implied (accepted as regular and routine by the employer).

When implied overtime becomes contractual: Regular overtime transitions to contractual status when you work extra hours consistently (e.g., every Tuesday for six months), the employer accepts and pays for them, and neither party objects. Tribunals assess frequency, duration, employer reliance, and the employee’s reasonable expectation of payment (Dudley MBC v Willetts [2017] UKEAT/0334/16/JOJ; Malik v BCCI [1997]).

What is the legal overtime rate? Minimum wage rules and calculations

There is no statutory minimum overtime rate in the UK. Instead, the law protects you by ensuring your average hourly pay across all hours never falls below the National Minimum Wage.

How to calculate average hourly pay:

Worked example: Employee contracted at 40 hours/week at £12.71/hour; works 8 unpaid overtime hours/week.

Weekly pay = £12.71 × 40 = £508.40

Total hours worked = 48

Average hourly rate = £508.40 ÷ 48 = £10.59/hour

Result: £10.59/hour average = unlawful breach of the £12.71 statutory minimum.

Working Time Regulations: 48-hour weekly limit and rest breaks

The Working Time Regulations 1998 impose a hard ceiling on working hours and mandatory rest periods; overtime cannot exceed these legal limits.

Key points:

• The 48-hour limit is averaged over 17 weeks; individual weeks may exceed 48 hours provided the average stays at or below 48 (Working Time Regulations 1998, reg. 4).
• Employees may opt out of the 48-hour limit only if they sign a written agreement that is genuinely voluntary and can be cancelled at any time by the employee.
• Breach of working time rules triggers detriment claims (unfair treatment, reduced hours, demotion) and unfair dismissal claims if dismissed (Working Time Regulations 1998, reg. 30; Employment Rights Act 1996, section 100).
• Night workers are capped at 8 hours per day on average; they must also receive free health assessments.

What can you claim if overtime isn’t paid? Tribunal remedies and back-pay

If unpaid overtime breaches your contract or the minimum wage, you can claim in the employment tribunal for unlawful deduction of wages and recover back-pay from up to two years prior.

What you can claim:

• Back-pay: Full amount of unpaid overtime, calculated from the date it became due up to two years prior to your claim (Wages Act 1986, section 23).
• Interest: Prejudgment interest accrues on unpaid wages from the date payment was due until settlement or tribunal decision (tribunal discretion, typically 8% per annum).
• Tribunal costs: If the employer is represented by solicitors and you win, the tribunal may order the employer to contribute toward your legal costs (tribunal discretion).
• Continuing breach: If unpaid overtime is ongoing at the time of claim, the two-year window runs from the final underpayment date (Bear Scotland v Fulton [2014] UKEAT/0010/16/JW).

FAQs

Does holiday pay have to include overtime?

Yes, if you received overtime consistently in the previous year. Your employer must include it in at least four weeks of statutory holiday entitlement (Working Time Regulations 1998, reg. 16). Exclusion is a breach. Calculation: (gross overtime pay ÷ total hours worked) × holiday hours.

Can you refuse overtime or be dismissed for refusing?

If overtime is non-contractual, you can refuse without penalty; dismissal for refusing is unfair (Employment Rights Act 1996, section 98). If contractual, refusal may be fair after proper discipline. However, dismissal for refusing overtime that would breach the 48-hour limit or minimum wage is automatically unfair (Working Time Regulations 1998, reg. 30).

What is the time limit for claiming unpaid overtime?

Three months minus one day from the final unpaid wages (currently); six months from October 2026 (Employment Rights Act 2025). Back-pay covers up to two years prior. Mandatory ACAS early conciliation must precede tribunal filing; failure to notify ACAS will almost always result in claim rejection.

Can my employer be forced to pay back-pay if I didn’t explicitly ask for it?

Yes. If unpaid overtime breaches your contract or causes average pay to fall below minimum wage, the employer is liable for back-pay from up to two years prior, regardless of whether you raised the issue (Wages Act 1986, section 23). Legal obligation is automatic.

Overtime has no legal premium rate, but your average pay must stay above National Minimum Wage (£12.71/hour, 21+) and you cannot work more than 48 hours weekly on average. Regular unpaid overtime becomes contractually binding. Unpaid overtime breaching these rules is unlawful. Claim within three months minus one day (six months from October 2026) via ACAS; back-pay covers two years prior.

This article provides general legal information only; it is not personalised legal advice. Seek a qualified employment solicitor for your specific circumstances.

How Qredible supports your case:

Whether you are resolving an overtime dispute or preventing future claims, Qredible’s network of employment solicitors provides procedural clarity and objective evidence.

KEY TAKEAWAYS

• Overtime pay is not legally required, but average hourly pay must stay above National Minimum Wage (£12.71/hour, 21+, April 2026); regular unpaid overtime becomes contractually binding once accepted by the employer.
• Tribunal claims must be filed within three months minus one day (six months from October 2026) after mandatory ACAS conciliation; back-pay covers two years prior, and missed deadlines forfeit the right to claim.
• Holiday pay must include regular overtime in at least four weeks of statutory entitlement; exclusion is automatic breach; dismissal for refusing overtime breaching the 48-hour limit or minimum wage is automatically unfair.