Zero-Hours Holiday Pay: UK Guide for Employers

Zero-hours holiday pay is one of those rota-admin jobs that looks simple until you try to apply it to real shift patterns. One person works every Saturday. Another picks up irregular evenings. Someone else works heavily during school holidays and then disappears for weeks. The question is not just “how much holiday do they get?” It is also “how do we prove we calculated it fairly?”

In the UK, zero-hours workers can still be entitled to paid annual leave. The challenge for employers is that entitlement and holiday pay need to reflect variable hours without guessing, underpaying, or treating holiday as something workers only get if the rota happens to be quiet.

This guide explains the practical difference between holiday entitlement, holiday pay, 12.07% accrual, rolled-up holiday pay and the 52-week average pay rule — and why accurate rota records matter.

First: zero-hours does not mean zero holiday

A worker does not lose paid holiday rights because their hours change from week to week. The key questions are whether they have worker or employee status, whether they are genuinely an irregular-hours or part-year worker, and which holiday-year rules apply.

GOV.UK explains that most workers are entitled to 5.6 weeks of paid holiday per year. For irregular-hours and part-year workers, the post-April 2024 rules allow holiday entitlement to build up in a way that better reflects the hours actually worked. GOV.UK holiday entitlement guidance is the official starting point.

The practical lesson for managers is simple: do not treat holiday as an afterthought at payroll time. The rota, clock-in records, approved leave and payslip process all need to join up.

Holiday entitlement vs holiday pay

These two phrases are often mixed together, but they are not the same thing.

• Holiday entitlement is the amount of leave a worker builds up and can take as time off.
• Holiday pay is the money they should receive for that holiday.

For a regular full-time employee, this can be fairly straightforward. For zero-hours or irregular-hours staff, it is more awkward because the person may not work the same number of hours each week, and their pay may include overtime, premiums or other variable elements.

This is where good scheduling records become important. If you cannot easily see what someone worked, when they worked it, what they were paid and when holiday was taken, every calculation becomes harder to defend.

The 12.07% accrual method explained

For irregular-hours and part-year workers, statutory holiday entitlement can accrue at 12.07% of the hours worked in a pay period . ACAS explains that this percentage is based on the statutory minimum holiday entitlement of 5.6 weeks. ACAS guidance on irregular-hours workers sets out how this accrual works.

Example:

• A worker completes 80 hours in a monthly pay period.
• 80 × 12.07% = 9.656 hours of holiday accrued.
• The employer then records the accrued entitlement according to its holiday process and rounding rules.

This method is useful because it follows the actual pattern of work. If someone works more hours in a busy month, they accrue more holiday. If they work fewer hours in a quiet month, they accrue less.

The trap is using 12.07% for everyone without checking whether the worker is genuinely irregular-hours or part-year. If someone actually has a stable working pattern, a different approach may be needed.

How holiday pay is calculated

Holiday entitlement tells you how much leave has been built up. Holiday pay tells you what the worker should be paid when holiday is taken.

For irregular-hours and part-year workers, holiday pay is based on average pay over the previous 52 paid weeks . Weeks with no pay are generally left out, and employers may need to look back further to find enough paid weeks. ACAS guidance on calculating holiday pay explains the 52-week approach.

Example:

• A worker has 52 paid weeks of earnings available.
• Their total pay across those paid weeks is £15,600.
• £15,600 ÷ 52 = £300 average weekly pay.
• One week of holiday should therefore be paid at £300, subject to the applicable rules and the worker’s circumstances.

This matters because paying holiday at the worker’s basic hourly rate can be wrong if their normal pay includes regular variable elements. Employers should be careful not to strip out pay that should properly form part of normal holiday pay.

Rolled-up holiday pay: allowed, but not casual

Rolled-up holiday pay means paying an additional amount with each payslip instead of paying holiday pay only when the worker takes holiday. This used to be a legally sensitive area, but the rules now allow it for irregular-hours and part-year workers in the permitted circumstances.

ACAS says rolled-up holiday pay must be calculated at a rate of at least 12.07% of the worker’s total pay in the pay period and shown separately on the payslip. ACAS rolled-up holiday pay guidance gives the current requirements.

Two points are easy to miss:

• Rolled-up holiday pay does not remove the worker’s right to take holiday as time off.
• It should be clear on the payslip, not hidden inside a single hourly rate.

If your business uses rolled-up holiday pay, the rota system still needs to show when holiday is requested, approved and taken. Otherwise, you may be paying the percentage but failing to manage actual rest from work.

Common mistakes with zero-hours holiday pay

Most mistakes are not deliberate. They happen because the rota, payroll and leave records live in different places.

• Using 12.07% for the wrong worker: a regular-hours worker should not automatically be treated as irregular just because they are part time.
• Paying holiday only when requested: employers still need to track entitlement, leave taken and any untaken holiday.
• Hiding rolled-up holiday pay: rolled-up holiday pay should be itemised separately where it is used.
• Forgetting zero-pay weeks: average holiday pay calculations should be based on paid weeks in the way the rules require.
• Losing the audit trail: if a worker challenges a calculation, screenshots and spreadsheet fragments are a weak defence.

What happens when a zero-hours worker leaves?

When a worker leaves, the employer usually needs to check whether any statutory holiday has been accrued but not taken. Untaken holiday should be dealt with in the final pay according to the relevant rules and the worker’s contract.

This is another reason to avoid loose manual records. If a manager has to reconstruct a worker’s hours from old rotas, WhatsApp messages and payroll exports, the final calculation is far more likely to be challenged.

A practical checklist for employers

Before each payroll run, managers should be able to answer:

• Which zero-hours staff worked during this pay period?
• How many hours did each person actually work?
• Are they genuinely irregular-hours or part-year workers?
• How much holiday entitlement has been accrued?
• Has any holiday been requested, approved, refused or taken?
• Are rolled-up holiday payments shown separately if used?
• Can we explain the calculation if a worker asks?

If answering those questions takes hours, your holiday process is probably too manual.

How FlowRota helps

FlowRota gives managers a cleaner foundation for zero-hours holiday administration by keeping rota activity, worked hours and leave records closer together. Instead of relying on a spreadsheet that only one manager understands, your team gets a clearer picture of who worked, who requested leave and what needs checking before payroll.

• Track scheduled and worked hours across variable patterns
• Keep leave requests and approvals in one place
• Maintain a clearer record of rota changes and shift swaps
• Support holiday accrual checks for irregular-hours staff
• Reduce manual re-keying between rota and payroll processes
• Give managers a stronger audit trail for pay queries

FlowRota is not a substitute for legal or payroll advice, but it does remove a lot of the messy record-keeping that causes mistakes in the first place.

Note: This article is general guidance for UK employers and reflects guidance available in May 2026. Holiday pay can depend on contract terms, worker status, the leave year and the exact working pattern. For complex cases, check official guidance or take professional advice.