How To Calculate Holiday Pay In The UK: Employer Rate Guide

Getting holiday pay right is one of those “small detail, big consequence” areas of employing staff in the UK.

If you underpay, you risk grievances, HMRC/tribunal claims, and a big hit to trust in your business. If you overpay (or calculate inconsistently), your payroll costs creep up and it’s hard to fix without upsetting people.

The good news is that once you understand the rules and set up a consistent approach, it becomes a repeatable payroll process. Below, we’ll walk through how to calculate holiday pay in the UK (including the tricky cases like overtime, commission and irregular hours), and how to set your team up with the right contracts and policies from day one.

Why Holiday Pay Calculations Matter For Small Businesses

Holiday pay isn’t just a payroll admin task - it’s a legal compliance issue and a people issue.

From a legal perspective, holiday pay is tied to statutory paid annual leave under the Working Time Regulations 1998. If you get the holiday pay rate wrong, an employee may have a claim for:

• Unlawful deduction from wages (for underpaid holiday), and/or
• Breach of contract (if your contract promises more than the legal minimum).

From a business perspective, consistent holiday pay calculations help you:

• forecast staffing costs more accurately (especially in retail, hospitality and seasonal businesses),
• avoid disputes when someone’s pay varies week-to-week, and
• set clear expectations about overtime, commission and allowances.

Practically, this is where having a clear Employment Contract and a well-written Staff Handbook makes a real difference - so you’re not relying on “how we’ve always done it”.

What Holiday Are Employees Entitled To (And What Counts As Holiday Pay)?

Before you can work out the holiday pay rate, you need to know what leave you’re paying for.

Statutory Holiday Entitlement

Most workers are legally entitled to 5.6 weeks’ paid holiday per leave year (this is the UK statutory minimum). For a full-time employee working 5 days a week, that’s typically 28 days.

Important point for employers: those 28 days can include bank holidays, but they don’t have to - it depends on the contract wording. If you use wording like “inclusive of bank holidays”, you should be clear on what that means operationally and for entitlement tracking (this is a common source of confusion): inclusive of bank holidays.

Also note: special rules can apply to irregular hours and part-year workers. Depending on your leave year start date and payroll setup, you may be calculating their entitlement by accrual (rather than just “days”), and some employers can lawfully use rolled-up holiday pay for these categories if it’s correctly itemised and paid.

What “Holiday Pay” Is Meant To Represent

In plain English, holiday pay is meant to reflect what the person would have earned if they were working, so they aren’t financially worse off for taking leave.

For some staff that’s simple (a fixed salary). For others, pay varies - and that’s where holiday pay calculations get more technical. Depending on the role and pay structure, holiday pay can need to factor in elements like:

• regular overtime payments,
• commission that is linked to work performed, and
• certain allowances that are paid regularly and form part of “normal” pay.

One key nuance: the case law around “normal remuneration” is detailed, and (historically) there has been a distinction between the first 4 weeks of statutory leave and the additional 1.6 weeks under UK law. Many employers take a consistent approach across the full 5.6 weeks to reduce admin and avoid disputes, but you should make sure your approach is defensible and documented.

This is why it’s worth aligning your contracts and payroll processes with the underlying rules in the Working Time Regulations - even small inconsistencies can compound over time.

How To Calculate Holiday Pay: A Step-By-Step Approach

If you’re trying to calculate holiday pay correctly, the first step is identifying whether the employee has fixed pay or variable pay. The calculation method can be different.

Step 1: Confirm The Worker’s Pay Type

• Fixed pay: salary is the same each pay period (or fixed hours with fixed hourly rate).
• Variable pay: hours and/or pay varies (common for zero-hours, casual workers, shift work with overtime, commission-based roles, etc.).

Step 2: Identify The Holiday Being Taken (Days/Hours)

Your payroll needs to know what is being booked:

• Days (typical for full-time salaried staff), or
• Hours (common for shift workers).

Tip: tracking entitlement in hours is often cleaner for irregular schedules because it reduces rounding disputes.

Step 3: Calculate Holiday Pay For Fixed Pay Staff

For fixed pay staff, holiday pay is usually straightforward: pay them their normal pay for their normal working week.

Common payroll approaches include:

• Salaried employee: holiday pay is typically their normal salary (e.g. monthly salary continues as normal).
• Fixed hours hourly employee: holiday pay is hours of leave taken × hourly rate.

Example (fixed hours):
If your employee works 37.5 hours a week at £12/hour and they take 7.5 hours off (1 day), their holiday pay for that day would usually be:
7.5 × £12 = £90.

Step 4: Calculate Holiday Pay For Variable Pay Staff (Using An Average)

If pay varies, the “what would they have earned” concept is usually handled by using an average.

In many cases, you’ll look at a reference period of up to 52 weeks of paid work to calculate average weekly pay. If there are weeks where no pay was earned (for example, the person didn’t work any shifts), those weeks may be ignored and you keep going back until you have enough paid weeks (up to the maximum look-back period).

Basic approach (illustrative):

1. Add up the employee’s gross pay over the reference period (e.g. the last 52 paid weeks).
2. Divide by the number of weeks included to get their average week’s pay.
3. Use that average weekly pay to determine the holiday pay due for the holiday period taken (and make sure the relevant “normal remuneration” elements are included).

Example (variable pay):
Let’s say a shift worker’s gross pay over 12 paid weeks is £3,600.
Average week’s pay = £3,600 ÷ 12 = £300.
If they take 1 week of holiday, their holiday pay would typically be £300 (subject to what’s included as “normal remuneration”).

This is the core idea behind how holiday pay is calculated for variable-pay workers: you’re paying an average that reflects normal earnings, not just basic hours at a minimum rate.

Step 5: Make Sure You’re Including The Right Pay Elements

One of the biggest employer pain points is deciding what goes into the holiday pay rate.

As a general rule of thumb, ask: “Is this payment a regular part of what the employee normally earns when working?” If yes, it may need to be included (particularly for the portion of statutory leave where “normal remuneration” principles apply).

Common inclusions (often relevant):

• regular overtime (especially if it’s routinely worked),
• commission linked to sales/work output (if it forms a normal part of earnings),
• shift premia/allowances that are regularly paid.

Common exclusions (often, but it depends):

• truly occasional one-off bonuses,
• genuine expense reimbursements (not “allowances” paid regardless of spend),
• payments that aren’t tied to work performed.

If you’re unsure, it’s worth getting advice - because the “what’s normal pay” analysis is where disputes usually arise.

Common Holiday Pay Scenarios (And How To Handle Them)

If you employ anyone outside a standard Monday–Friday salary pattern, you’ll want your process to cover these scenarios upfront.

Irregular Hours And Zero-Hours Workers

For casual staff, the key is consistency and accurate records (timesheets, rota records and payroll data).

• Track holiday entitlement in hours (or by an accrual method that fits your workforce and leave year rules).
• Use a clear reference period to calculate average pay where required.
• Be consistent about which pay elements are included.

Depending on the category of worker and your leave year dates, you may be able to use rolled-up holiday pay for irregular hours/part-year workers (if it’s clearly itemised and paid correctly). If you don’t use rolled-up holiday pay, you’ll typically be paying holiday when leave is taken based on the applicable averaging rules.

Also make sure your contract terms match how you actually run the working relationship (it’s surprisingly common for businesses to treat someone as “casual” but operate like they’re permanent staff, which can create wider employment risks).

Overtime: When Does It Affect Holiday Pay?

If overtime is genuinely ad hoc and rare, it may not form part of “normal” pay. But if overtime is worked regularly (even if not guaranteed), it can be harder to justify excluding it from the holiday pay rate.

Employer tip: don’t try to “solve” this with informal arrangements. Clarify overtime rules in your Employment Contract and ensure payroll knows what is contractual vs discretionary.

Commission And Performance Payments

If commission is a normal part of earnings, holiday pay may need to reflect it - otherwise the employee is financially worse off for taking leave, which is exactly what the holiday rules are trying to prevent.

From a small business perspective, this is where you’ll want to:

• document how commission is earned and when it’s paid, and
• align your commission structures with a clear payroll method.

If you use commission, you may also benefit from having a standalone commission document or clearly drafted clause structure (it’s much easier to administer when it’s written down properly).

Bank Holidays, Non-Working Days, And “Day In Lieu”

Two common questions we hear are:

• “What if a bank holiday falls on someone’s non-working day?”
• “Can we offer a day in lieu instead?”

The answer usually comes down to contract wording and consistency. If you promise bank holidays off, you need a fair approach for staff who don’t normally work that day. If you offer time off in lieu (TOIL), document how it accrues and when it can be taken: day in lieu.

It’s also worth having a written approach for what happens if a non-working day falls on a bank holiday, because it affects rostering, entitlement tracking and staff expectations: non-working day falls on a bank holiday.

Can You Decide When Staff Take Holiday?

In many workplaces, leave can’t be completely “take it whenever you want”. You may need minimum staffing levels, blackout periods or approval processes.

In the UK, employers can set rules around taking annual leave (subject to notice rules and acting reasonably), but you should document this clearly so it doesn’t become a constant back-and-forth: dictating holidays.

Holiday Pay Rate Pitfalls To Avoid (Payroll Mistakes That Cause Disputes)

Most holiday pay problems don’t happen because a business is trying to do the wrong thing - they happen because the rules are fiddly, and payroll is busy.

Here are some of the most common pitfalls we see in small businesses.

1. Using Basic Pay Only When Pay Is Variable

If someone’s normal earnings include regular overtime, commission or allowances, paying holiday at “basic pay only” can create a shortfall. Over time, that can add up.

2. Applying The Wrong Reference Period

If you’re using an averaging method, you need a consistent, defensible approach (and to ignore weeks that shouldn’t be counted where appropriate). If your reference period changes from person to person without a clear rule, it’s harder to justify.

3. Not Keeping Records

You don’t want to be reconstructing entitlement from old rota screenshots when there’s a dispute.

At a minimum, keep reliable records of:

• holiday accrual and leave taken,
• hours worked,
• payments made (and what they relate to), and
• your holiday year dates and rules.

4. Unclear Contract Wording Around Holiday And Bank Holidays

If your contract says one thing but your managers do another, that’s when “custom and practice” arguments appear - and those are rarely fun to deal with.

Clear drafting matters, especially around whether leave is inclusive of bank holidays and what happens for part-time staff.

How To Set Up Your Business To Calculate Holiday Pay Correctly

Once you’ve worked out the right holiday pay approach for your team, the next step is to embed it into your documents and processes.

Put The Right Terms In Writing

To keep things practical and enforceable, make sure your core employment documents clearly cover:

• holiday entitlement (and whether it includes bank holidays),
• the holiday year and how leave is requested/approved,
• rules on carry-over, and
• what counts as normal pay (and how overtime/commission is treated).

This is typically handled across an Employment Contract and your Staff Handbook (policies are especially useful for approval rules, notice requirements, and operational details).

Align Payroll, Managers And Your Leave Booking System

Your best legal drafting won’t help if:

• managers approve leave that payroll doesn’t know about,
• your rota system tracks hours differently to payroll, or
• commission is recorded in one spreadsheet but paid from another.

A simple internal checklist can help:

• Confirm leave is booked in one system (even if it’s just a shared tracker).
• Confirm which pay elements are included in the holiday pay rate for variable pay staff.
• Spot-check a few holiday pay calculations each quarter (especially for shift workers).

Get Advice If Your Pay Structures Are Complex

If you use multiple allowances, fluctuating overtime, commission schemes, or you’re scaling quickly, it’s worth getting tailored advice. A small tweak to contract wording or payroll setup now can save a lot of back-and-forth later.

Key Takeaways

• To calculate holiday pay correctly, start by identifying whether the worker has fixed pay or variable pay, because the holiday pay rate is worked out differently.
• Fixed pay staff are usually paid their normal salary or normal hours × hourly rate when they take leave.
• Variable pay staff often require an averaging approach using a reference period of paid weeks, so holiday pay reflects what they would normally earn.
• Holiday pay can need to include elements like regular overtime, commission and allowances if they form part of “normal” earnings (and “normal remuneration” rules can be nuanced, particularly around the 4 weeks vs 1.6 weeks split).
• Bank holiday entitlements and day-in-lieu rules should be clearly documented to avoid disputes, especially for part-time and shift workers.
• Strong employment documents and consistent payroll processes help you stay compliant and reduce the risk of wage deduction claims.

If you’d like help reviewing your holiday pay approach, updating your contracts, or putting clear workplace policies in place, you can reach us at 08081347754 or team@sprintlaw.co.uk for a free, no-obligations chat.