UK Holiday Pay Explained: How to Check If You Were Underpaid

If your UK holiday pay looks too low, first check whether your employer calculated the right amount of leave, used the correct pay rate and included the earnings that count. These are separate questions. A payslip can show the correct number of holiday hours but still pay them at the wrong rate; a worker may also receive the correct rate for too few hours. This guide shows how to reconstruct both calculations using your contract, timesheets and payslips, and how to raise a discrepancy without assuming that every difference is unlawful.

The rules are not identical for fixed-hours staff, genuinely irregular-hours workers and part-year workers. In addition, England, Scotland and Wales share the relevant Working Time Regulations framework, while Northern Ireland has separate legislation and official guidance. This article is a practical starting point, not individual legal advice. Check the current rules and your contract before acting.

The five-minute holiday-pay audit

1. Find the employer’s holiday year dates and the number of paid holiday days or hours stated in your contract.
2. Identify your working pattern: fixed contractual hours, irregular hours, or work required for only part of the year.
3. Collect at least three recent payslips, your holiday record, and—if your pay varies—the relevant earlier payslips.
4. Check separately how much leave you accrued and how much money each leave period should attract.
5. If figures differ, ask payroll for the calculation and the pay components they included.

Do not assume that “12.07%” is the right calculation for every worker. Under the current framework it is the statutory leave accrual method for qualifying irregular-hours and part-year workers, not a universal deduction or a blanket substitute for holiday pay. See Acas guidance on worker classification.

Step 1: Identify which rules apply to your contract

A rotating shift pattern is not automatically “irregular hours”. Acas gives the example of a two-week rotating schedule with fixed hours in each week: the hours change, but they are fixed by contract, so the special irregular-hours definition does not automatically apply. Likewise, working three days every week is part-time, not necessarily part-year. The legal definition of a part-year worker depends on unpaid non-working periods of at least a week under a continuing contract. Read the definitions at Acas.

Step 2: Calculate how much annual leave you should receive

Example A: fixed-hours employee

A full-year worker on a five-day schedule has a statutory minimum of 5.6 × 5 = 28 days, including any bank holidays counted by the employer. A full-year worker with a fixed three-day week has 5.6 × 3 = 16.8 days. The employer may give more; the contract controls any enhancement. Bank holidays do not automatically mean extra leave on top of the statutory allowance. GOV.UK explains the leave entitlement calculation.

Example B: variable-hours worker paid monthly

Suppose a qualifying irregular-hours worker logs 86 hours in a pay period and receives only statutory leave. The raw accrual is 86 × 0.1207 = 10.3802 hours. Under the statutory pay-period rounding rule, the fractional part below half an hour rounds down, giving 10 hours accrued for that pay period. The employer must apply the correct rounding method and yearly cap, not silently carry a different assumption across every payslip. This is an illustrative calculation, not an actual payroll case.

Example C: the rounding threshold matters

If the worker logs 95 hours, the calculation is 95 × 0.1207 = 11.4665 hours, normally rounded down to 11 hours under the prescribed rule. If they log 96 hours, 96 × 0.1207 = 11.5872 hours, normally rounded up to 12 hours. The two pay periods differ by one hour worked but may produce different rounded leave totals. Always inspect the pay-period calculation rather than multiplying an annual total and rounding once. See Acas on accrual and rounding.

Step 3: Check the rate of holiday pay—not just the days

Holiday pay is intended to reflect the earnings that legally count as “normal remuneration”. For regular-hours workers, the legal minimum can involve at least four weeks at the normal rate and the remaining 1.6 weeks at the basic rate; contracts can improve this. Regular overtime, relevant commission and certain status-related payments may need to be included in the appropriate calculation. Do not simply compare holiday pay with basic hourly pay when variable earnings are substantial. GOV.UK holiday pay guidance and Acas calculation guidance explain these distinctions.

For irregular-hours and part-year workers paid when leave is taken, holiday pay is based on an average over up to 52 paid weeks, potentially looking back as far as 104 calendar weeks to obtain those paid weeks. Weeks with no pay or only certain statutory payments may need special treatment. This is different from counting the last 52 calendar weeks indiscriminately. Acas provides the reference-period rules.

Worked example: an apparently missing overtime component

Imagine a worker takes one week of holiday. Their relevant normal weekly remuneration for that leave is £560 after including qualifying regular overtime, but payroll pays £480 basic pay. The illustrative gap is £560 − £480 = £80. Whether that £80 is legally owed depends on the worker category, which weeks of statutory leave are being paid, the earnings involved and the contract. The calculation flags a question for payroll; it does not prove an unlawful deduction on its own.

Step 4: Understand rolled-up holiday pay

For eligible irregular-hours and part-year workers, employers may choose rolled-up holiday pay for qualifying leave years beginning on or after 1 April 2024. It is an identifiable additional payment alongside ordinary pay each pay period, not an unexplained reduction in the stated hourly rate. It is not an option for regular-hours workers. The amount is generally calculated as 12.07% of total pay for the pay period, with adjustments for contractual leave beyond the statutory minimum and certain absence situations. The government’s reform guidance includes worked examples.

Illustration: total eligible pay of £800 in one period gives £800 × 0.1207 = £96.56 in rolled-up holiday pay. If the payslip separately shows only £70, the unexplained difference is £26.56. Before alleging underpayment, check whether the worker qualifies, which earnings are included, the leave year, the actual calculation method, and any lawful adjustment. Crucially, 12.07% of hours accrued and 12.07% of pay paid are different quantities: hours versus pounds.

Step 5: Build an evidence-based underpayment check

Make a small spreadsheet with one row per pay period or holiday event. Record the original figures as printed rather than replacing them with your estimate. Then calculate a separate “expected” column, keeping notes on assumptions. This avoids the common problem of arriving at a headline figure without being able to explain how it was obtained.

Three diagnostic cases most short guides overlook

Case 1: “I received 28 days, but my holiday pay was low”

A fixed-hours worker may receive the correct leave quantity while receiving the wrong amount for a particular holiday period. Check the pay-rate rules and relevant overtime or commission, not just the leave balance. Ask which part of the statutory entitlement the payment relates to, and whether enhanced contractual leave has separate rules.

Case 2: “My zero-hours payslip says holiday pay included”

Confirm the contract genuinely meets the irregular-hours definition and that the relevant leave year permits rolled-up pay. Look for a separately identifiable holiday-pay entry. Then calculate the percentage against total pay for the pay period, not only the basic rate if other earnings must be included. Also verify that the worker is still able to take their actual leave: payment and time off are distinct rights.

Case 3: “I work a repeating rota, so payroll uses 12.07%”

A repeating rota with contractually fixed hours may be a regular-hours arrangement even if weekly totals alternate. Ask payroll which statutory definition it applied. This classification question can matter more than arguing over a few minutes of rounding.

The 2026 record-keeping change adds a useful verification route

From 6 April 2026, employers must keep records of annual leave and holiday pay, including carry-over and payments in lieu, and retain them for at least six years. This does not guarantee that every employee can demand a particular spreadsheet format, but it makes a precise request for the calculation and its components especially useful. Acas explains the new record-keeping duties.

Ask for the dates of leave, leave balance, calculation method, reference weeks used, variable earnings counted, and whether any rolled-up holiday pay was included. If a payroll system only displays a single unexplained figure, request a written breakdown rather than accepting an unsupported reassurance.

How to raise the discrepancy without weakening your case

1. Start with a calm written enquiry to payroll or HR. Quote the exact pay periods and the figures you cannot reconcile.
2. Attach copies of relevant payslips and timesheets, with sensitive identifiers redacted where appropriate.
3. Ask for the contractual and statutory basis for the method used, and a corrected calculation if an error is confirmed.
4. Keep the response, date and any agreed correction in writing.
5. If unresolved, use the employer’s grievance process and seek advice promptly from Acas, Citizens Advice, your union or an employment adviser.

Suggested email wording: “I am reviewing my holiday entitlement and pay for [dates]. My payslip shows [amount], while my calculation based on [hours/reference earnings] is [amount]. Could you please confirm the applicable worker category, the leave year, the pay components included, and provide a breakdown of the calculation? I have attached the relevant records. Thank you.”

Time limits and jurisdiction: do not wait indefinitely

Employment tribunal deadlines can be short. Acas cautions that a worker may have only three months minus one day from the most recent incorrect holiday payment to bring a claim, depending on the circumstances. Internal grievances do not automatically stop time running; early conciliation has its own rules. Multiple underpayments and historical claims can involve additional limits and legal complexity. Get tailored advice early rather than assuming you can recover every earlier discrepancy. See Acas on holiday pay disputes.

Northern Ireland has distinct employment legislation and tribunal arrangements. Readers there should verify the applicable rules through official Northern Ireland services or a qualified adviser instead of automatically applying Great Britain-specific procedures.

Mistakes that can produce a false underpayment figure

• Counting bank holidays twice when they are already included in the statutory or contractual allowance.
• Applying the 12.07% accrual method to a fixed-hours employee without checking the legal definition.
• Confusing leave hours accrued with pounds of rolled-up holiday pay.
• Ignoring pay-period rounding for qualifying irregular-hours workers.
• Treating every overtime payment or bonus identically without checking whether it counts toward normal remuneration.
• Using the last 52 calendar weeks rather than the appropriate paid-week reference method.
• Comparing net take-home pay with gross holiday-pay entitlements.
• Assuming a difference is automatically unlawful before checking enhanced contractual leave and the relevant statutory portion.

Official sources and next steps

Use the GOV.UK holiday entitlement calculator and explanation for a starting estimate; check GOV.UK holiday pay for statutory principles; and use Acas irregular-hours guidance, Acas pay calculations and 2026 record-keeping guidance for worker-specific rules. Citizens Advice offers additional practical help if your employer disputes entitlement.

Bottom line: a credible holiday-pay check has two independent parts: how much leave should you have? and how much should that leave be paid? Classify the contract first, calculate with the right reference period and evidence, then ask for a payroll breakdown. A documented £20 discrepancy is more actionable than an unsupported claim of a much larger loss.