UK Holiday Entitlement and Accrual — The 2026 SME Guide

The single most-commonly-miscalculated piece of UK HR is holiday entitlement.

That is not a hyperbolic opener. Talk to any employment solicitor handling SME work and they will tell you the same thing: holiday gets miscalculated more often than wages, overtime, or pension contributions combined. The rules sound simple — "5.6 weeks for everyone" — but the moment a worker has irregular hours, a part-year contract, accrued sickness, or a bank holiday falling on a Sunday, the maths goes sideways. And in April 2024, the rules for shift and part-year workers changed for the first time in over a decade.

This guide walks through the 2026 position in plain English, citing gov.uk and Acas at every step. It is written for the HR manager or operator at a UK SME who is handling absence themselves, not for a specialist employment lawyer. Where the law itself is being stated, we quote it rather than paraphrase — because in a tribunal, that distinction matters.

The basics — 5.6 weeks

The statutory floor is set by Regulation 13 and Regulation 13A of the Working Time Regulations 1998. Together they give every "worker" — not just employees — four weeks of annual leave plus an additional 1.6 weeks, for a total of 5.6 weeks per leave year.

Gov.uk states it bluntly: "Almost all people classed as workers are legally entitled to 5.6 weeks' paid holiday a year." Acas echoes the same figure: "By law, workers are entitled to 5.6 weeks' statutory paid holiday a year."

Two facts hide inside that single sentence.

First, the entitlement applies to workers, a category broader than employees. Casuals, zero-hours staff, and most agency workers all qualify. Genuine self-employed contractors do not.

Second, 5.6 weeks is the minimum. Contracts can offer more — and many do — but they cannot offer less.

What 5.6 weeks looks like in practice

For full-time staff on a standard pattern, the maths is the one most managers know: "Most workers who work a 5-day week must receive at least 28 days' paid annual leave a year." Five days a week multiplied by 5.6 weeks equals 28 days.

For part-time staff with consistent hours, you scale by working days rather than hours. Gov.uk gives the worked example directly: "if they work 3 days a week, they must get at least 16.8 days' leave a year (3 × 5.6)."

There is a cap. Gov.uk confirms: "Statutory paid holiday entitlement is limited to 28 days." Someone working a six-day week does not get 33.6 days statutorily — they get 28. Anything above that is contractual generosity, not law.

For staff with irregular hours or part-year contracts — the group where most miscalculations happen — the rules changed substantially in 2024. We will come back to that in detail below.

Bank holidays — additional, or part of the 5.6 weeks?

This is the single most-asked question in SME HR, and the legal answer is unintuitive.

Bank holidays are not a separate statutory holiday entitlement on top of the 5.6 weeks. Gov.uk is explicit: "Bank or public holidays do not have to be given as paid leave." An employer can include bank holidays inside the 5.6 weeks, on top of the 5.6 weeks, or pay through them entirely — whatever the contract says.

In practice, most SMEs offer one of two structures: "28 days plus bank holidays" (about 36 days off in England and Wales in a typical year), or "28 days inclusive of bank holidays" (the statutory minimum, with eight days already earmarked for the public calendar). Both are lawful. What is not lawful is leaving the contract silent and improvising later.

Acas frames it the same way: "Bank holidays might be included in this paid holiday. Workers should check their contract if they're not sure." The instruction "check the contract" is the giveaway — the contract is where the answer lives, not the law.

The 2024 accrual change for shift and part-year workers

For leave years beginning on or after 1 April 2024, the government introduced a new accrual method for two specific categories: irregular-hours workers and part-year workers.

Gov.uk defines an irregular-hours worker as someone where "the number of paid hours that they will work in each pay period during the term of their contract in that year is, under the terms of their contract, wholly or mostly variable." A part-year worker is one whose contract requires them to work only part of the year, with periods of at least a week off and unpaid (think term-time-only school staff).

The new accrual method is mechanically straightforward: "Holiday entitlement for these workers will be calculated as 12.07% of actual hours worked in a pay period."

The 12.07% figure is not arbitrary. Gov.uk explains the arithmetic: "The 12.07% figure is based on the fact that all workers are entitled to 5.6 weeks' leave. This means that a worker's total working weeks in a year is 46.4 (52 weeks in a year minus 5.6 weeks of leave). 12.07% of 46.4 is 5.6."

In practice: a shift worker doing 40 hours in a pay period accrues 4.83 hours of paid leave (40 × 0.1207). Over a year, that lands them on the statutory 5.6 weeks. Acas summarises the same rule as accrual "at 12.07% of the hours they work in a pay period", with the accrual booked on the last day of the pay period and partial hours rounded — under 30 minutes down, 30 minutes or more up.

This was a deliberate reversal of the Supreme Court's 2022 decision in Harpur Trust v Brazel, which had held that part-year workers on permanent contracts were entitled to the full 5.6 weeks without pro-rating. Parliament restored the 12.07% method for new leave years from 1 April 2024.

Two things to flag for SMEs:

The new method only applies to leave years that began on or after 1 April 2024. Leave years that started 31 March 2024 ran the old (Brazel) rules to their end. If your leave year aligns with the calendar, the new method applied from 1 January 2025.
Classification matters more than the maths. Whether a worker is "irregular hours," "part-year," or just a regular part-timer with a stable rota determines which rule set applies. Get the classification wrong and the calculation that follows is wrong by definition.

Carry-over — what can and cannot roll forward

The default position under the Working Time Regulations is that the four weeks from Regulation 13 must be taken in the leave year they accrue. The additional 1.6 weeks from Regulation 13A can be carried over by agreement, but only into the following leave year.

There are three statutory exceptions where carry-over is mandatory.

Long-term sickness. Acas confirms: "If a worker is on long-term sick leave, they can carry over a maximum of 4 weeks' holiday entitlement." The carried leave must be used within 18 months of the end of the leave year in which it accrued.

Statutory family leave. If a worker cannot take their holiday because they were on maternity, paternity, adoption or shared parental leave, "they must be allowed to carry the holiday over to the next leave year."

Employer failure. If you, as the employer, did not give the worker a reasonable opportunity to take their leave, did not warn them they would lose it, or refused requests, they can carry over up to four weeks regardless of policy.

For irregular-hours and part-year workers under the post-2024 rules, the carry-over rights are broader still — up to 5.6 weeks can roll forward in the same circumstances.

Tracking accrual for shift workers — why automation matters

The 12.07% rule is simple in isolation. It becomes operationally difficult when you have thirty shift workers on different rotas, each accruing a fraction of an hour every pay period, against a leave year that has to balance to 5.6 weeks at year-end. The arithmetic does not fit on a spreadsheet without error-prone copy-and-paste.

Worse, the Acas guidance on calculating holiday pay requires you to use a 52-week reference period of the worker's average pay when they actually take that leave — and to include overtime, commission and shift premia in the calculation for at least the four-week tranche. Two different 52-week windows have to be tracked: one for accrual, one for the pay rate.

For a 50-person SME, this is the work of an absence module, not a spreadsheet.

Three common miscalculations

These are the errors that turn up most often in audits and tribunal claims.

1. Treating bank holidays as a separate legal entitlement. They are not. If your contract says "28 days plus bank holidays," that is a contractual generosity. Some operators then conclude that bank-holiday pay is a statutory right and panic when a public-holiday Monday lands in the middle of an annual-leave block. The contract sets the rule, not the calendar.

2. Using 12.07% for everyone variable. Post-2024, the 12.07% method applies only to the defined categories of irregular-hours workers and part-year workers. A part-time worker on a stable three-day-a-week pattern is not an irregular-hours worker — they get the regular 5.6-weeks-times-working-days calculation (16.8 days a year, in that example). Applying 12.07% to them risks under-allocating leave and triggers an unlawful deductions claim.

3. Calculating holiday pay using basic salary alone for variable-pay staff. Acas is explicit that, for staff who regularly receive overtime, commission, or shift premia, "When a worker takes holiday, they should be paid the same as when they're at work." Holiday pay for variable earners is calculated on a 52-week average of normal pay, not the contractual base rate. The 2020 extension of the reference period from 12 to 52 weeks closed the loophole that had let many seasonal businesses lowball the calculation.

2026 UK bank holidays

For planning purposes, the official list of bank holidays for 2026 is below. England and Wales have 8 bank holidays this year (Boxing Day falls on a Saturday, so the substitute is Monday 28 December); Scotland has 9; Northern Ireland has 10.

Date	England & Wales	Scotland	Northern Ireland
Thu 1 Jan	New Year's Day	New Year's Day	New Year's Day
Fri 2 Jan	—	2nd January	—
Tue 17 Mar	—	—	St Patrick's Day
Fri 3 Apr	Good Friday	Good Friday	Good Friday
Mon 6 Apr	Easter Monday	—	Easter Monday
Mon 4 May	Early May	Early May	Early May
Mon 25 May	Spring	Spring	Spring
Mon 13 Jul	—	—	Battle of the Boyne (sub.)
Mon 3 Aug	—	Summer	—
Mon 31 Aug	Summer	—	Summer
Mon 30 Nov	—	St Andrew's Day	—
Fri 25 Dec	Christmas Day	Christmas Day	Christmas Day
Mon 28 Dec	Boxing Day (substitute)	Boxing Day (substitute)	Boxing Day (substitute)

Because Boxing Day 2026 falls on a Saturday, the substitute weekday becomes the bank holiday. Multi-site employers with staff in Scotland and Northern Ireland should configure their absence system regionally, not at company level.

The closing thought

Holiday entitlement is unforgiving precisely because the rules look simple. 5.6 weeks. 28 days. 12.07%. The numbers fit on a postcard — and that is the trap. The complexity lives in the joins: which worker class, which leave year, which reference period for the pay rate, which contract clause on bank holidays.

For an SME without a dedicated payroll company, the practical answer is to stop trying to track accrual in a spreadsheet. An absence module that classifies workers correctly at onboarding, accrues 12.07% on each pay-period close for shift and part-year staff, and surfaces the 52-week reference-period pay rate at booking is the difference between a clean year-end and a four-figure tribunal letter.

See how WagePerks tracks 12.07% accrual, 52-week reference pay, and regional bank holidays automatically on the Absence module page. Or if you're running HR and payroll yourself for a 10–250-person team, see what an integrated employee management portal looks like for UK SMEs.

Sources

All sources verified 2026-06-10.