How is holiday pay calculated?

Holiday pay looks trivial until you leave the textbook case. What does a “week’s pay” actually mean when someone earns commission? Which weeks do you average? And how do you handle irregular hours or a mid-year start? The underlying idea is consistent across most countries: paid time off should not cost the worker money, so holiday pay reflects what they would have earned. The mechanics, however, differ by jurisdiction. This guide explains the principle, then walks through the common calculation methods, using UK rules as a concrete reference where helpful. Treat the figures as indicative, not personalised legal advice.

What is the basic principle of holiday pay?

Whatever the country, holiday pay rests on one idea: a worker on paid leave should receive their normal remuneration, roughly what they would have earned had they worked. The complexity only comes from defining “normal” when pay is not a flat monthly figure. Here is how the calculation typically unfolds.

The important distinction is between entitlement (how many days or weeks of holiday someone earns) and pay (how much each of those days is worth). They are calculated separately, and it is easy to confuse the two.

How much paid holiday are workers entitled to?

Entitlement is set by law and can be topped up by contract. In the United Kingdom, almost all workers are entitled to 5.6 weeks of paid holiday per year. For someone working a standard five-day week, that caps at 28 days a year, and an employer can choose to count public (bank) holidays within that figure. Part-time workers get the same 5.6 weeks, pro rata to the days they work.

Across the European Union, the statutory floor is four weeks of paid annual leave, though many member states are more generous. In the United States, there is no federal requirement to provide paid holiday at all, so entitlement is whatever the employer offers. The point to remember: entitlement is local, and it sets the number of days you then have to pay for.

How is holiday pay calculated for fixed hours and pay?

This is the simple case. If a worker has fixed hours and a fixed salary, a week of holiday is worth exactly a week of their normal pay, and a single day is worth their normal daily rate. A salaried employee who takes a week off usually sees no change on their payslip at all, because their monthly salary already covers it.

For someone paid a fixed weekly wage, one day of holiday is simply the weekly wage divided by the number of days normally worked. There is no averaging and no reference period to worry about. The complications only start when earnings vary from week to week.

How is holiday pay calculated when pay varies?

When earnings change from one period to the next, because of overtime, commission, tips or irregular shifts, you cannot use a single “normal” week. Most systems solve this with an average. In the UK, holiday pay for workers with variable pay is based on the average weekly earnings over the previous 52 weeks in which they were paid.

The detail matters: weeks in which the worker earned nothing are skipped, and the employer counts back further to make up a full 52 paid weeks, looking back up to 104 weeks if necessary. For someone who has been employed for less than 52 weeks, you simply average whatever paid weeks are available.

The UK also has specific rules for irregular-hours and part-year workers (for example zero-hours or term-time staff), introduced for leave years starting on or after 1 April 2024. They accrue holiday at 12.07% of the hours they actually work in each pay period. That figure comes from dividing 5.6 weeks of leave by the 46.4 weeks of the year that remain. Employers can then either pay this as rolled-up holiday pay (an extra 12.07% on each payslip, itemised separately) or pay the 52-week average when leave is taken. Other countries handle casual and part-year work differently, so this is a UK-specific mechanism, not a universal one.

What counts as pay in the calculation?

A frequent and costly mistake is to base holiday pay on basic salary alone. UK case law and guidance are clear that holiday pay must reflect normal remuneration, which includes more than the base rate. When a worker regularly receives extra earnings, those should feed into the average.

• Regular overtime, including non-guaranteed overtime that is worked consistently.
• Commission that forms a normal part of pay, such as sales commission.
• Shift premia and allowances tied to how or when the work is done.
• Performance and productivity bonuses linked to the work itself.

One-off, genuinely exceptional payments can usually be left out, but the direction of travel in UK law is to include anything intrinsically linked to the job. The definition of “normal pay” varies by country, so check what your local rules require before excluding a component.

A worked example to make it concrete

Take a UK worker whose pay varies with commission. Suppose that, across the last 52 paid weeks, their total earnings (basic plus regular commission and overtime) came to £26,000. Here is how the two situations compare.

Illustrative example only, ignoring the specifics of any real payroll (part weeks, unpaid weeks, tax and deductions). Amounts and rules vary by country. This is not personalised advice.

For strictly fixed pay, the two approaches land in almost the same place. The 52-week average pulls ahead as soon as the worker earns meaningful commission, overtime or shift pay, because those extras raise the average above basic salary. That is exactly why basing holiday pay on base pay alone tends to short-change variable-pay workers.

The safest rule of thumb: holiday pay should leave the worker no worse off than if they had actually worked that week, which means capturing their normal earnings, not just their base rate.

Do you need software to calculate holiday pay?

For one or two salaried staff, a spreadsheet is fine. But as soon as a business has variable hours, commission, part-year contracts, joiners and leavers mid-year, tracking a rolling 52-week reference period by hand becomes slow and error-prone. This is where an HR system or payroll tool earns its place: it logs hours, maintains the reference period, averages variable pay and applies the correct accrual, then produces a compliant payslip.

The same tools handle final pay on leaving, calculating pay in lieu of any accrued but untaken holiday. On price, several major HR and payroll platforms do not publish a public rate card: expect pricing on request, based on headcount and modules (indicative, July 2026).

Sources: Acas (acas.org.uk) and gov.uk holiday entitlement and pay guidance, consulted July 2026. Figures are indicative and rules vary by country; this is not personalised legal advice.