12.07% holiday accrual calculator

How the 12.07% accrual works

For leave years beginning on or after 1 April 2024, an irregular-hours or part-year worker in Great Britain accrues holiday on the last day of each pay period at 12.07% of the hours they worked in it (regulation 15B of the Working Time Regulations 1998). Each period's figure is rounded on its own: a part-hour under 30 minutes counts as nothing, and 30 minutes or more as a whole hour. The holiday can be taken from the next pay period on.

GOV.UK's two worked examples, both reproduced by this calculator: 68 hours worked in a month earn 8 hours of holiday (8.2076 rounds down), and 30 hours worked in a week earn 4 hours (3.621 rounds up). The year's total can't pass 28 days (regulation 15B(4)); enter the worker's usual day length and the calculator applies that cap in hours.

Does the method apply? The scope check

• The worker. Regulation 15F defines both groups for each leave year. An irregular-hours worker's paid hours in each pay period are, under their contract, wholly or mostly variable, such as a zero-hours contract. A part-year worker is required to work only part of the year, with periods of at least a week when they don't work and aren't paid, such as a seasonal worker. Someone on a fixed rota of set hours is neither.
• The leave year. It applies to leave years that begin on or after 1 April 2024. A leave year that started earlier ran on the old rules until it ended.
• The nation. Regulation 15B extends to England, Wales and Scotland. Northern Ireland has its own working time regulations, and the 12.07% method doesn't apply there.

Everyone else gets 5.6 weeks a year under regulations 13 and 13A, capped at 28 days, pro-rated to their working week. Use the annual leave calculator for them.

What the calculator leaves out

It covers the statutory minimum. A contract that gives more holiday uses a higher rate: GOV.UK's example is 6 weeks, which works out at 13.04%. Holiday also accrues while a worker is off sick or on family leave, worked out from their average hours over the previous 52 weeks (regulation 15C), and that isn't included here. Holiday pay, including rolled-up holiday pay, is a separate calculation for your payroll. For the full explainer, read holiday pay for irregular hours: the 12.07% rule, and for four-day and compressed weeks see holiday entitlement on a four-day week.

Last checked on 21 October 2026 against the Working Time Regulations 1998 on legislation.gov.uk and GOV.UK's guidance on the 2024 holiday reforms. This is general guidance, not legal advice, and your contracts and policy decide the details.