UK Holiday Entitlement and Pro-Rata Calculations

UK holiday entitlement is set by the Working Time Regulations 1998. Statutory minimum is 5.6 weeks of paid holiday per year (28 days for a 5-day-a-week worker). Bank holidays may or may not be included in the 28 days depending on the contract. The framework has been refined through case law including the significant Harpur Trust v Brazel Supreme Court decision affecting irregular-hours workers.

This guide covers the statutory entitlement, pro-rata calculation for part-time workers, the irregular-hours nuance, payment of holiday pay, and the carry-over rules.

Statutory entitlement and bank holidays

Statutory minimum 5.6 weeks per year under the Working Time Regulations 1998. For a full-time worker on a 5-day week, this equals 28 days of paid holiday a year. The 5.6 weeks consists of 4 weeks under the original EU Working Time Directive (regulation 13) plus 1.6 weeks under domestic UK extension (regulation 13A).

Bank holidays: 8 UK bank holidays per year (different in Scotland and Northern Ireland). The contract specifies whether bank holidays are included in the 28 days or separate. 'Inclusive' means 28 days total covers both holiday and bank holidays. 'Plus bank holidays' means 28 days holiday + the 8 bank holidays = effectively 36 days off paid.

Most UK employers offer more than the statutory minimum. A typical pattern is 25 days of holiday + 8 bank holidays = 33 days, with annual increments to 30+ days for long-service employees. The actual figure varies by employer and seniority.

Worked example: an employee on contract showing '25 days holiday plus bank holidays' takes 33 days off paid each year. An employee on '28 days holiday inclusive of bank holidays' takes 28 days total off, of which up to 8 may fall on bank holidays.

Part-time pro-rata calculation

Part-time workers receive 5.6 weeks of holiday pro-rata. The calculation depends on the working pattern. For regular part-time work (e.g. 3 days a week), the entitlement is 3 * 5.6 = 16.8 days, typically rounded up to 17 days.

Where bank holidays are part of the entitlement, the calculation applies to the total. A part-time worker on 3 days a week with '28 days inclusive of bank holidays' gets 3/5 * 28 = 16.8 days, rounded up to 17. The worker takes 17 days off paid, including any bank holidays falling on their working days.

Bank holidays that fall on a non-working day: a part-time worker on Mon/Wed/Fri doesn't get a 'day in lieu' for a Tuesday bank holiday. The entitlement calculation already pro-rates the bank holidays into the total. Some employers offer in-lieu days as an enhancement but it is not statutory.

Practical action: part-time workers should check the pro-rata calculation against their working days. Some employers calculate incorrectly (giving too few days), particularly where bank holidays fall on the worker's non-working days. Acas has detailed guidance on pro-rata calculations.

Irregular hours and the Harpur Trust v Brazel decision

The Supreme Court decision in Harpur Trust v Brazel (2022) clarified the holiday calculation for permanent workers with irregular hours (term-time-only, zero-hours, fluctuating hours). The case held that such workers are entitled to the full 5.6 weeks of holiday regardless of hours worked - they cannot be 'pro-rated' below 5.6 weeks based on weeks not worked.

For a term-time teacher (working 38 weeks of the year): the previous practice of pro-rating to 38/52 of 5.6 weeks was held wrong. The teacher is entitled to the full 5.6 weeks of holiday calculated on a 52-week reference period.

The decision affected significant numbers of UK workers. Many employers implemented adjustments and back-pay arrangements. The government legislated specific changes through the Employment Rights (Amendment, Revocation and Transitional Provision) Regulations 2023 to allow rolled-up holiday pay for irregular workers from April 2024.

Worked example: a term-time worker employed permanently on irregular hours. Before Harpur Trust, holiday pro-rated to working weeks; after, 5.6 weeks calculated on the 52-week year using a 52-week reference period for the pay. The change increased many term-time workers' holiday entitlement by 30-40%.

Payment of holiday pay

Holiday pay must equal 'normal pay' for the holiday period under regulation 16 WTR 1998. For a salaried employee with consistent pay, the daily/weekly rate is straightforward. For workers with variable pay (overtime, commission, shift premia), the average pay over a reference period applies.

Reference period: 52 weeks of normal pay before the holiday is taken (or 'previous 12 weeks' in older case law, updated to 52 weeks under the Employment Rights (Employment Particulars and Paid Annual Leave) (Amendment) Regulations 2018 from April 2020). The reference period excludes weeks with no pay.

'Normal pay' includes regular overtime, regular commission, regular shift premia. Discretionary bonuses (one-off, not regular) typically don't count. The line between 'regular' and 'discretionary' has been litigated; the principle is that payments forming part of normal remuneration should be reflected in holiday pay.

Worked example: a sales employee on GBP 30,000 base + average GBP 5,000/year commission. Holiday pay should reflect both. Daily rate = (GBP 35,000 / 260 working days) = GBP 135/day. A 5-day holiday produces GBP 675 of holiday pay, not just the GBP 577 that the base-only rate would produce.

Carry-over and termination

Carry-over: holiday must generally be taken in the year it accrues. The 4 weeks under regulation 13 (EU-derived) cannot be carried forward (with limited exceptions for sickness, maternity, etc.). The 1.6 weeks under regulation 13A (UK extension) can be carried over by agreement.

Sickness exception: where an employee was unable to take holiday due to long-term sickness, the 4 weeks can be carried forward for up to 18 months under specific case law (NHS Leeds v Larner). After 18 months without taking the holiday, it lapses.

Maternity, paternity, adoption: holiday accrues during these periods. The employer cannot insist the holiday be taken concurrently with the parental leave. On return from leave, the employee can take the accrued holiday.

Termination: untaken holiday at termination is paid as 'pay in lieu'. The calculation is based on the accrual to date less the holiday already taken. Where the employee has taken more holiday than accrued, the employer can deduct the excess from final pay (if contractually permitted) or recover separately.

Rolled-up holiday pay from April 2024

The Employment Rights (Amendment, Revocation and Transitional Provision) Regulations 2023 introduced 'rolled-up holiday pay' for irregular-hours workers from 1 April 2024. Employers can choose to pay an additional 12.07% on each pay period rather than paying separately when holiday is taken.

The rolled-up approach simplifies administration for irregular workers. Each pay run includes the working pay plus 12.07% holiday element. The worker still has 5.6 weeks of legal holiday entitlement; the pay element is delivered in real time rather than held for separate payment.

The 12.07% figure represents 5.6 weeks as a proportion of the 46.4 working weeks in a year. The rolled-up element is shown on the payslip as a separate line so the worker can see the holiday pay portion.

Edge case: rolled-up holiday pay applies only to irregular-hours workers. Regular employees and workers with predictable patterns continue under the standard model (holiday paid when taken). The choice between rolled-up and standard is the employer's, applied to all irregular workers in the same way.

Frequently asked questions

How many days holiday do I get in the UK?

Statutory minimum 5.6 weeks per year (28 days for a 5-day week, pro-rata for part-time). Bank holidays may be included in the 28 days or separate, depending on the contract. Most UK employers offer more than the minimum; typical pattern 25 days of holiday plus 8 bank holidays = 33 days total. Long-service employees may have higher entitlement under their contract.

How is part-time holiday calculated?

Pro-rata by working days. A worker on 3 days a week gets 3/5 of the full-time entitlement. If the full-time entitlement is 28 days inclusive of bank holidays, the 3-day-a-week worker gets 3/5 * 28 = 16.8 days, typically rounded up to 17 days. Bank holidays falling on non-working days don't trigger in-lieu days unless the contract specifies.

Does holiday pay include overtime?

Where overtime is regular (forming part of normal pay), yes. The Bear Scotland case and subsequent decisions established that regular overtime, commission, and shift premia should be reflected in holiday pay. The 52-week reference period averages the pay including these elements. One-off overtime or genuinely irregular payments typically don't need to be included.

Can I carry holiday over to next year?

The 4 weeks from regulation 13 WTR cannot normally be carried forward. The additional 1.6 weeks from regulation 13A can be carried over by agreement. Exceptions for carry-over: long-term sickness preventing the holiday being taken (up to 18 months), parental leave (accrued holiday taken on return), employer's failure to allow holiday to be taken. Many employers' contracts allow some carry-over by agreement.

What is the Harpur Trust v Brazel case?

Supreme Court decision in 2022 clarifying holiday entitlement for permanent workers with irregular hours (term-time-only, zero-hours, fluctuating hours). The court held that such workers are entitled to the full 5.6 weeks of holiday regardless of weeks not worked - not pro-rated down. The decision affected term-time teachers, casual hospitality workers, and others. Government legislation in 2023 introduced rolled-up holiday pay for irregular workers from April 2024 as an alternative approach.