UK Statutory Leave Rule Pack
5.6-week entitlement, pro-rata, 12.07% accrual and the 52-week holiday-pay reference for the United Kingdom (GB)
A statutory rule pack for the UK leave engine
This add-on rule pack turns the United Kingdom (GB) statutory annual-leave rules into a working calculation engine for Odoo Human Resources. It computes the 5.6-week minimum entitlement, pro-rates it for starters and leavers, applies the 12.07% accrual method for irregular-hours and part-year workers, and derives a "week's pay" for holiday pay using the 52-week averaging reference period. Every figure is traceable to its legal source so your HR team can defend each number.
5.6-week entitlement & 28-day cap
The Working Time Regulations 1998 grant 4 weeks (reg 13) plus 1.6 weeks (reg 13A) = 5.6 weeks of paid annual leave. For a fixed weekly pattern the entitlement is 5.6 weeks multiplied by the contracted days per week, capped at the statutory 28 days. A full-time five-day worker gets exactly 28 days.
Pro-rata for part-year workers
Mid-year starters and leavers are pro-rated by the proportion of the leave year actually served, rounded up to the nearest half day in line with gov.uk guidance that statutory leave is never rounded down.
First-year accrual (reg 15A)
During the first year of employment the engine accrues one twelfth of the annual entitlement at the start of each month, rounded up to the nearest half day, exactly as required by Working Time Regulations reg 15A.
12.07% irregular-hours accrual
For irregular-hours and part-year workers (leave years from 1 April 2024) leave accrues at 12.07% of the hours worked — the figure derived from 5.6 / (52 − 5.6). The pack also computes the matching rolled-up holiday-pay uplift.
Holiday-pay reference: a week's pay
Holiday pay is built on a "week's pay" under sections 221 to 224 of the Employment Rights Act 1996. For workers with normal hours and fixed pay a week's pay is contractual (annual salary ÷ 52). For workers with variable pay the pack averages a week's pay over the 52-week reference period introduced on 6 April 2020: no-pay weeks are ignored and earlier paid weeks are brought in, looking back up to the 104-week statutory long-stop. The averaged week's pay is converted to a daily and hourly holiday-pay rate.
What you get
| Feature | Legal basis | Output |
|---|---|---|
| 5.6-week entitlement, 28-day cap | WTR 1998 reg 13 & 13A | Days / hours per worker |
| Pro-rata part-year | gov.uk / ACAS guidance | Rounded-up days |
| First-year monthly accrual | WTR 1998 reg 15A | Accrued days to date |
| Irregular-hours 12.07% accrual | WTR 1998 reg 15B (2024) | Accrued leave hours |
| Rolled-up holiday pay | WTR 1998 reg 16A (2024) | 12.07% pay uplift |
| Week's pay (fixed) | ERA 1996 s.221 | Salary ÷ 52 |
| Week's pay (averaged) | ERA 1996 s.224 | 52-week average |
| Daily / hourly holiday-pay rate | Derived | Rate per day / hour |
Leave statements per year
Build a leave statement for any leave year, populate it with your UK workers, and compute every worker's entitlement, holiday-pay rate, taken and remaining leave and leave value in one click. Export the whole register to CSV.
Quick calculator wizard
An ad-hoc calculator lets HR test any scenario — full year, pro-rata, first-year or irregular hours — and see the entitlement, week's pay and holiday-pay rate with a plain English explanation of the rule applied.
Built on community Odoo HR
The pack depends only on the community hr module.
The calculation core is pure Python and fully unit tested, with
the National Insurance number validator, configurable statutory
constants per company, and per-employee working patterns. No
Enterprise modules are required.
Disclosure: all rates, caps and reference periods carry the current UK statutory values. Confirm them against the latest gov.uk, ACAS and HMRC guidance before relying on them for live payroll and leave administration.
Screenshots
Leave Calculator
Leave Statements
Update date: 2026-07-02