Holiday at 12.07%.
For temps and anyone else whose hours change week to week. The holiday hours a pay period earns, the balance after leave taken, and the rolled-up holiday pay if you pay it with their wages instead.
How it works.
For leave years starting on or after 1 April 2024, regulation 15B of the Working Time Regulations 1998 says irregular-hours and part-year workers build up holiday on the last day of each pay period, at 12.07% of the hours they worked in it. 12.07% is 5.6 weeks of holiday as a share of the 46.4 weeks left to work in a year.
- Irregular hours means the paid hours in each pay period are wholly or mostly variable under the contract. Part-year means there are periods of at least a week in the year when they don't work and aren't paid. Most agency temps on variable hours are irregular-hours workers.
- Rolled-up holiday pay (regulation 16A) lets you pay holiday as a 12.07% uplift on pay for the work instead, but only for these workers. The holiday pay must be shown separately on the payslip, and they still take the time off; it just isn't paid again.
- While they're on sick leave or family leave, holiday builds up on their average hours instead; this tool doesn't cover that.
The 12.07% rule covers England, Scotland and Wales. Northern Ireland has its own regulations, which haven't adopted it. The total in a year can't go above 5.6 weeks' worth.
A guide, not legal advice. It applies the rules as written to the dates and figures you enter. Your own terms and the facts of a case can change the answer; if money or a dispute turns on it, check with an employment lawyer.
Rules as of 21 October 2026
When the rules change.
Rates and thresholds move most Aprils. Leave your email and we'll tell you when this tool is updated. We won't use it for anything else, and you can ask us to delete it at hello@hikari-ai.co.uk.
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