Holiday Pay on Variable Hours Explained

If your hours or pay change from week to week — whether you're on a zero-hours contract, a casual arrangement, or a role that includes regular overtime — there's a very good chance your employer is calculating your holiday pay incorrectly. This is one of the most widespread underpayment issues in UK employment law, affecting millions of workers.

This guide explains exactly how holiday pay should be calculated for variable-hours workers, what your employer must include, and what you can do if you think you're being shortchanged.

The Basic Entitlement

Every worker in the UK is entitled to at least 5.6 weeks of paid annual leave, regardless of their contract type. This is capped at 28 days for workers on a 5-day week, but the same 5.6-week entitlement applies to part-time, variable-hours, and zero-hours workers too — it just translates to fewer total days if you work fewer days per week.

Holiday entitlement begins from the first day of employment — there is no qualifying period. Entitlement accrues as you work.

How Much Should Holiday Pay Actually Be?

This is where most employers go wrong. Holiday pay must reflect your normal remuneration — what you would normally earn if you were at work. It is not simply your basic hourly rate.

UK case law — drawing on European Court of Justice rulings — has established that normal remuneration must include:

• Regular overtime (both guaranteed and non-guaranteed, if routinely worked)
• Regular commission or results-based pay
• Shift premiums and unsocial hours payments
• Standby or on-call payments (where regularly received)
• Some allowances paid as a matter of course

Payments that do not count toward holiday pay include one-off or purely discretionary bonuses, expense reimbursements, and employer pension contributions.

The consequence of this is significant: a worker who earns £12/hour basic but consistently works 10 hours of overtime per week is not receiving their legal entitlement if their holiday pay is calculated on basic hours only. Their holiday pay rate should reflect their true average earnings including that overtime.

The 52-Week Reference Period

For workers with variable pay or hours, holiday pay is calculated using a 52-week reference period. The rule is straightforward:

1. Take the last 52 weeks in which the worker worked and was paid
2. Skip any weeks in which the worker received no pay (illness, unpaid leave, gaps between assignments)
3. If needed, extend back up to 104 weeks to capture 52 paid weeks
4. Total up the gross pay across those 52 weeks
5. Divide by 52 to get the average weekly pay
6. This average is the rate the employer must pay for each week of holiday taken

This rule has applied since April 2020, when the reference period was extended from 12 to 52 weeks to give a fairer picture of a worker's earnings over time, and to prevent seasonal workers from being paid less for holidays taken during quieter periods.

The chart shows a typical seasonal worker whose pay peaks in summer. Under the old 12-week rule, if they took holiday in September using only the preceding 12 weeks as reference, they'd receive a higher (but unrepresentative) rate. The 52-week average smooths this out and gives a truer picture of normal earnings — which is fairer in both directions: neither inflated by a recent busy period nor deflated by a recent quiet one.

Workers Who Haven't Been Employed for 52 Weeks

If you haven't yet worked for 52 paid weeks, your employer uses all the paid weeks available. If you've worked 18 paid weeks, the average is calculated across those 18. There is no minimum number of weeks required to calculate a reference period — even one week of pay history gives a basis for the calculation.

The 12.07% Accrual Rate for Irregular Hours

For workers on irregular or zero-hours contracts, holiday entitlement accrues at 12.07% of hours worked. This figure comes from the formula: 5.6 weeks ÷ (52 − 5.6) = 5.6 ÷ 46.4 = 12.07%.

In practice: if you work 100 hours in a month, you accrue 12.07 hours of paid holiday (100 × 0.1207). The pay rate for that holiday is then calculated using the 52-week reference period.

From January 2024, employers can also use rolled-up holiday pay for irregular hours workers — adding 12.07% to each payslip rather than paying separately when leave is taken. This is only lawful if it is clearly identified on the payslip and the worker can still take the time off. A worker receiving rolled-up pay should not receive additional payment on top when they actually take holiday, as it has already been included.

Common Employer Mistakes

These are the holiday pay errors that most often lead to underpayment:

• Using basic rate only — calculating holiday pay on the contractual hourly rate and ignoring all overtime, commission, and shift premiums. This is the most common error and affects the most workers.
• Using a 12-week average instead of 52 — the 52-week reference period has been law since April 2020. Some employers or payroll systems haven't been updated.
• Treating overtime as "voluntary" to exclude it — the test is whether overtime is regularly worked, not whether it's contractually guaranteed. Non-guaranteed but regularly worked overtime must be included.
• Failing to extend back when recent weeks had no pay — if you were on sick leave or unpaid absence recently, those weeks must be skipped and the reference period extended back to capture 52 paid weeks.
• Applying rolled-up pay without showing it on the payslip — rolled-up holiday pay is only lawful if clearly identified. A blanket uplift hidden in a headline hourly rate is unlawful.

What You Can Do If You're Being Underpaid

If you believe your employer is calculating your holiday pay incorrectly, you have several options:

• Raise it informally — speak to your line manager or HR department and point to the 52-week reference period requirement and the normal remuneration rules. Many errors are genuine mistakes in payroll systems that employers will correct once flagged.
• Submit a formal grievance — if informal discussion doesn't resolve it, raise a formal written grievance. Your employer must respond in writing and investigate.
• Contact Acas — Acas provides free advice and early conciliation. Before making an employment tribunal claim, Acas early conciliation is a required step.
• Employment tribunal claim — underpaid holiday pay is an unlawful deduction from wages, giving rise to a tribunal claim. The time limit is 3 months from the most recent underpayment. A series of underpayments may be treated as a single continuing series, potentially extending the period you can claim for.

Gather records before you act: payslips for the last 52 weeks (or as many as you have), details of hours worked and any overtime, and any written calculation your employer has provided for holiday pay.

Bank Holidays

There is no automatic legal right to paid bank holidays off. Your entitlement depends on your contract. Your employer can count bank holidays as part of your 5.6-week statutory entitlement, meaning the 28-day cap for full-time workers may already include the 8 bank holidays in England and Wales.

Many contracts state holiday as "28 days including bank holidays" — meaning your actual free-to-book leave is only 20 days. Others state "28 days plus bank holidays" — giving you 36 days total. Check your contract carefully.

Part-time workers should pay particular attention: if most bank holidays fall on days you don't work (e.g. Mondays, when you're not contracted), but your full-time colleagues are off on those days, you may be at a disadvantage. Many employers resolve this by expressing leave in hours rather than days.

Holiday Pay When You Leave

When you leave a job, you must be paid for any holiday you've accrued but not taken. This is called payment in lieu of accrued holiday and must be calculated at the correct rate — using the same 52-week average for variable workers, not basic rate only.

If you've taken more holiday than you've accrued at the point of leaving, your employer can (if your contract allows) deduct the overpayment from your final pay.

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Frequently Asked Questions

My contract says I'm only entitled to basic pay on holiday. Can my employer do that?

No — not if you regularly earn more than your basic rate through overtime, commission, or shift premiums. Contractual terms cannot override statutory rights. Even if your contract explicitly states holiday pay is basic rate only, you are still legally entitled to receive normal remuneration based on your actual earnings pattern. A contract clause that removes a statutory right is unenforceable.

I'm on a zero-hours contract. Do I get paid holiday?

Yes. Zero-hours workers have exactly the same holiday entitlement as any other worker — 5.6 weeks per year. For zero-hours workers the entitlement accrues at 12.07% of hours worked. Your holiday pay rate is based on your average pay over the last 52 paid weeks. Your employer cannot withhold holiday pay just because your contract doesn't guarantee hours.

How far back can I claim for unpaid or underpaid holiday?

You must make an employment tribunal claim within 3 months of the most recent underpayment (or underpaid holiday payment). A series of related deductions — for example, consistently underpaid holiday over several years — may be treated as a single continuing series, allowing claims going back further. The 2-year backstop on unlawful deductions claims has been challenged in case law, and some tribunals have found it unlawful; this area is still developing. Get advice from Acas or a solicitor before assuming a hard time limit applies to your specific situation.

Does holiday pay continue to accrue during sick leave?

Yes. Holiday entitlement accrues throughout a period of sickness absence, including long-term sick leave. You cannot lose accrued holiday because you were too ill to take it. If you're unable to take statutory holiday because of illness, you can carry it over — the four weeks of EU-derived leave can be carried over for up to 18 months after the end of the leave year in which it accrued.

My employer uses rolled-up holiday pay — is that legal?

Yes, since January 2024, for irregular hours and part-year workers. Rolled-up holiday pay (adding 12.07% to each payslip) is lawful provided it is clearly identified on the payslip as holiday pay and the worker can still take the leave. If it's not shown separately on your payslip, or if your employer tries to prevent you from taking leave, that is unlawful.

Summary

• All workers are entitled to 5.6 weeks / 28 days of paid holiday per year from day one
• Holiday pay must reflect normal remuneration — not just basic rate. Regular overtime, commission, and shift premiums must be included
• Variable-hours workers use a 52-week reference period: average pay across the last 52 weeks in which they were paid
• Weeks with no pay are skipped; the reference period extends back up to 104 weeks to capture 52 paid weeks
• Irregular hours workers accrue holiday at 12.07% of hours worked; rolled-up holiday pay is lawful for this group since January 2024
• Underpaid holiday pay is an unlawful deduction from wages — you can raise a grievance, contact Acas, or make a tribunal claim (within 3 months)
• Use the Holiday Pay Calculator → to find your correct weekly rate