Part-Time Annual Leave, The Pro-Rata Rule

The Core Principle: Same Entitlement, Scaled Down

It's a common misconception that part-time officers sit on a separate, lower annual leave scale. They don't. Under Police Regulations 2003 Annex O (Regulation 33), your annual leave entitlement in days is set by your rank and your length of relevant service — exactly the same table a full-time officer at the same rank and service length uses. Part-time working doesn't change which band you sit in.

What part-time working changes is how many of those days you actually accrue, because a "day" of leave is really a proportion of a working week, and your working week is shorter. The mechanism is a straightforward ratio: your full-time entitlement is multiplied by your contracted hours divided by the standard 40-hour week that entitlement assumes, and the result is rounded to the nearest half day. Work exactly half the standard week and you get, broadly, half the days. Work three-quarters of it and you get roughly three-quarters of the days.

This is the same logic that applies across most public-sector part-time leave arrangements, and it's worth internalising because it means your leave doesn't just depend on your rank and years of service — it moves every time your contracted hours change.

Worked Examples: The Mechanism In Practice

These figures are illustrative examples of how the ratio behaves, not a published table — your actual full-time starting point depends on your rank band, your service length, and whether the 2025 amendment applies to your appointment date. Run your own numbers through the calculator above for the exact figure.

Not every combination of hours lands on a whole number so neatly — that's exactly why the rounding-to-the-nearest-half-day step exists. Someone working 22 hours a week, for instance, would see their days scaled by a ratio of 0.55 and then rounded, rather than left as an awkward fraction of a day.

Does The Shift-Stacking Trick Still Work Part-Time?

Our companion article on maximising annual leave against your shift pattern explains how booking leave around your natural working block — rather than scattering single days — lets your days off do more work by chaining onto rest days either side.

That logic holds up for most part-time officers, because reduced hours are usually delivered as a smaller number of shifts within the same underlying rota, rather than a wholesale switch to a different shift pattern. If your team runs a standard rotating shift cycle, you're typically still working a subset of those same shifts on the same rotation — just fewer of them across the cycle. That means the same "identify your working block, then book the whole block off" approach still applies; you're simply applying it against a smaller total pool of leave days than a full-time colleague on the same rota.

The annual leave calculator handles the part-time scaling automatically, so you can see your true day count before working out how far it stretches against your actual rota.

When Your Hours Change Mid-Year

Moving from full-time to part-time (or the other way round) partway through a leave year is a genuinely fiddly area, and it's one where the general principle is easier to state than the precise arithmetic. In broad terms, your entitlement for that leave year is typically apportioned across the periods you spent on each working pattern — so many days accrued at your old hours, plus the remainder accrued at your new hours — rather than your whole year simply being recalculated on whichever hours you happen to be working when the year ends.

Exactly how that apportionment is calculated, how leave already taken is treated against it, and how it interacts with your force's leave year start date can vary between forces and between individual circumstances. This article is a guide to the underlying mechanism, not a substitute for checking your specific mid-year change with your force's HR or pay team before you rely on a figure for planning purposes.

Frequently Asked Questions