Part-time employees get the same leave entitlement as full-time employees, calculated pro rata. They do not get a lesser entitlement — they get the identical entitlement expressed in their own working weeks, which for someone working three days a week means three-fifths of the days a full-timer receives, and exactly the same number of weeks off.
The distinction between “less leave” and “the same leave, pro-rated” is not pedantry. It is the difference between a compliant policy and a discrimination claim, and it is where most part-time leave errors originate.
Key Takeaways
- The governing principle everywhere is pro rata by hours or days worked, not a reduced entitlement.
- The unit matters: calculate in weeks or hours, never in whole days for irregular patterns.
- UK: 5.6 weeks, capped at 28 days. AU: 4 weeks on ordinary hours. NZ: 4 weeks of your working weeks. US: no federal requirement at all.
- The two classic errors are rounding down and mishandling public holidays for part-timers.
The Pro Rata Principle in One Line
Leave entitlement is expressed in weeks in most statutory systems. A week means one of your working weeks. That is why a part-time employee’s entitlement is not really reduced at all.
If a full-timer working 5 days a week gets 4 weeks, that is 20 days. If you work 3 days a week and get 4 weeks, that is 12 days. Both of you get four weeks away from work. The day count differs because your weeks differ.
Convert everything to weeks or hours first, then to days at the very end if you need a day figure. Working in days from the start is what produces wrong answers.
The Worked Calculation
Priya works 3 days a week, 22.5 hours, in the UK. Her full-time colleagues work 5 days, 37.5 hours.
Step 1 — Start with the statutory entitlement in weeks. UK statutory leave is 5.6 weeks.
Step 2 — Apply it to Priya’s working week. 5.6 weeks × 3 days = 16.8 days
Step 3 — Sanity-check against the full-time figure. Full-time: 5.6 × 5 = 28 days. Priya’s share: 28 × (3 ÷ 5) = 16.8 days. The two methods agree, which they always should.
Step 4 — Express in hours if the pattern varies. 22.5 hours per week × 5.6 weeks = 126 hours
Step 5 — Apply the contractual uplift, if any. If the employer gives 30 days rather than the statutory 28, Priya gets 30 × (3 ÷ 5) = 18 days. The uplift is pro-rated on the same fraction.
Step 6 — Do not round down. 16.8 days is a lawful entitlement. Rounding to 16 removes 0.8 of a day — about six hours of paid leave — and the rounding is unlawful because it produces less favourable treatment. Round up to 17, or keep the decimal and let people book half days.
That 16.8 figure is the whole reason to track leave in hours. In Priya’s case, 126 hours divides cleanly into shifts of any length.
How the Four Main Markets Handle It
| Full-time entitlement | Part-time treatment | Casuals | |
|---|---|---|---|
| UK | 5.6 weeks, capped at 28 days | Pro rata; protected by the Part-time Workers Regulations 2000 | Irregular hours workers accrue at 12.07% of hours worked |
| Australia | 4 weeks annual leave | Pro rata on ordinary hours of work | No paid annual leave; compensated by casual loading |
| New Zealand | 4 weeks annual holidays | 4 weeks of their working weeks | Entitlement or 8% pay-as-you-go, depending on the arrangement |
| US (federal) | None | None | None |
United Kingdom
Almost all workers get 5.6 weeks’ paid holiday, and GOV.UK caps the statutory figure at 28 days. Part-time workers are additionally protected by the Part-time Workers (Prevention of Less Favourable Treatment) Regulations 2000, which make it unlawful to treat a part-timer less favourably than a comparable full-timer on a pro rata basis.
For workers with genuinely variable hours, the 2024 reforms introduced accrual at 12.07% of hours worked for irregular hours and part-year workers — mathematically identical to 5.6 weeks, since 5.6 ÷ 46.4 = 0.1207. Our guide to calculating holiday entitlement for part-time UK staff works through the variations.
Australia
The Fair Work Ombudsman confirms full-time and part-time employees both get 4 weeks of annual leave, based on their ordinary hours of work, and that part-time employees receive the same minimum entitlements on a pro rata basis.
Fair Work’s own example: an employee working 20 hours a week accumulates 80 hours of annual leave a year — four weeks of work for her. Casual employees are the exception: they get no paid annual leave, because casual loading compensates for it. Our post on casual employee leave rights in Australia covers that trade-off, and full-time vs part-time leave in Australia covers the domestic detail.
New Zealand
Under the Holidays Act 2003, all employees become entitled to 4 weeks of annual holidays after 12 months of continuous employment. There is no separate part-time rule — the four weeks are four of the employee’s own working weeks.
Employment New Zealand gives the clean example: someone working three 8-hour days each week gets 12 × 8-hour days of annual holidays (3 days × 4 weeks). Where the pattern is consistent but not identical every week, the employee and employer can agree to work the entitlement out in days or in hours.
United States
There is no federal entitlement to paid vacation for anyone, full-time or part-time. The Department of Labor states that the FLSA does not require payment for time not worked; vacation, sick leave and holidays are matters of agreement between employer and employee.
US part-timers therefore get whatever the PTO policy says, and many policies exclude staff below a stated hours threshold entirely. Some state and city paid sick leave laws do cover part-time workers on an accrual basis — typically one hour of leave per fixed number of hours worked — which is the closest thing to a pro rata mandate in the US system.
The Two Errors That Cause Most Complaints
1. Rounding Down
16.8 becomes 16. 11.2 becomes 11. It looks tidy and it is a straightforward under-payment of entitlement. Round up or carry the decimal.
2. Public Holidays
This one is subtler and generates far more grievances. Public holidays cluster on particular weekdays — Mondays in the UK, Mondays in much of Australia. If an employer deducts a public holiday from a part-timer’s allowance only when it falls on one of their working days, then two part-timers on identical hours end the year with different amounts of usable leave purely because of which days they work.
The fix is the same in every market: pro-rate the combined total (annual leave plus public holidays) and then deduct the public holidays that actually fall on the employee’s working days. Everyone on the same fraction of hours ends up with the same total, whichever days they work.
A Quick Compliance Check
Run these five checks against your own leave data:
- Does every part-timer’s entitlement equal the full-time figure × their hours fraction, before rounding?
- Are any entitlements rounded down? Fix those first.
- Is the combined annual leave plus public holiday total pro-rated, rather than public holidays being deducted ad hoc?
- Are contractual extras above the statutory minimum pro-rated on the same fraction as the statutory part?
- For variable-hours staff, is the balance held in hours rather than days?
A failure on any one of those is usually systemic rather than individual — meaning it applies to every part-timer on your books, and has done for years.
What This Means for You
Set your leave system to calculate in weeks or hours and let it output days, rather than the reverse. Never round down. Hold public holidays as a separate pot from discretionary leave so the pro rata calculation stays honest for staff on any working pattern.
Leave Balance pro-rates automatically from each employee’s working pattern, holds balances in hours where the pattern varies, and keeps public holidays in their own allocation with the correct regional calendar — so a three-day-a-week employee and a five-day-a-week employee both get exactly what they are owed without a spreadsheet in the middle. Flat $10/month, unlimited employees, 14-day free trial.
This article is general information about leave entitlements across several jurisdictions, not legal advice. Rules vary by country, state, award and contract — take advice on your own situation.
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