Every argument about a leave balance comes down to four numbers that were never written down: when the leave year starts, how much accrues across it, how many unused days may cross into the next year, and the date those carried days expire. Put all four on the policy itself and the balance becomes something you can recalculate rather than something you have to defend from memory.
Why the leave year matters more than it looks
A leave year can run with the calendar, with the financial year, or from each person's own start date. Pick one per entity and record it, because it is the boundary every other number is measured against. An accrual of 25 days is meaningless until you know the twelve months it accrues over, and a carry-over cap is meaningless until you know the day it bites.
Anniversary-based leave years are the most expensive of the three to run by hand. Every person has a different boundary, so the January reconciliation everyone else does once becomes a rolling job you do all year.
Accrual: a rate, or a fixed grant
Two mechanisms are in common use, and a company usually runs both without noticing.
A fixed annual grant gives the whole entitlement at the start of the leave year. It is simple, and it creates an overdraft the moment someone leaves in March having taken three weeks in February.
Accrual gives the entitlement in proportion to service or to hours worked. GOV.UK sets this out for UK irregular-hours and part-year workers: they build up leave according to the hours they have already worked rather than getting a fixed number of days, and for leave years beginning on or after 1 April 2024 entitlement is calculated as 12.07% of actual hours worked in a pay period.
The statutory floor is a jurisdiction question. In the UK, GOV.UK states that almost all workers are legally entitled to 5.6 weeks of paid holiday a year, that most people working a five-day week must get at least 28 days, and that statutory paid entitlement is capped at 28 days, so someone working six days a week is still entitled to 28. Those figures apply to the UK and nowhere else. Every country sets its own floor, its own accrual method and its own treatment of public holidays, and the employment contract can sit above all of it.
Carry-over: the cap and the expiry date
A carry-over cap with no expiry date behind it turns into a slowly growing liability, because days that can cross one boundary can cross the next one too.
The UK position, as GOV.UK describes it after the 1 January 2024 reforms, has one ordinary case and three exceptions:
| Case | Days that carry forward | Condition |
|---|---|---|
| Ordinary carry-over | Up to 8 days | With the employer's agreement |
| Unable to take leave because of maternity or other family-related leave | Up to 28 days | Carried into the following leave year |
| Regular-hours worker unable to take leave because of sickness | Up to 20 days | Taken within 18 months of the end of the leave year it accrued in |
| Irregular-hours or part-year worker in those circumstances | Up to 28 days | Carried into the following leave year |
GOV.UK also describes cases where untaken leave carries over because of the employer's own conduct: refusing to recognise the right to annual leave, failing to give a reasonable opportunity to take it, or failing to tell workers that untaken leave would be forfeited. That last one is the practical trap in a use-it-or-lose-it policy. The forfeiture has to be communicated, not merely written down once.
Where your company gives more than the statutory minimum, the extra days are yours to govern. GOV.UK notes that an employer may allow additional untaken leave above 28 days to be carried over, and the contract or handbook says whether it does.
How to hold this in a record rather than a paragraph
In Unframed HR each leave type is its own policy row carrying its annual accrual, its carry-over cap and whether it is paid. Balances hang off that policy per person per leave year, so the same employee can have an annual balance, a sick balance and an unpaid arrangement that behave differently without anyone maintaining a parallel sheet.
One case is easy to get wrong and quietly expensive: someone who moves between two legal entities in the same group. Their opening balance is carried across and stamped with where it came from, so the accrual for the new year adds to it rather than granting the entitlement a second time. A balance that has been imported and a balance that has been accrued look identical on a screen, which is why the provenance is stored rather than inferred.
Acas advice on absence policies is worth applying to the leave policy as well as the sickness one: make the rules clear and easy to follow, share them with the whole organisation, and train people on them. A carry-over cap that only HR knows about produces a queue of exceptions every December.
What to check before the leave year turns
Run four checks in the last month of the leave year. How many people hold more than the carry-over cap. How many of those had a request refused during the year. Which policies have a cap but no expiry date recorded. And which entities have a statutory position that changed since the policy was written.
The first two are the ones that turn into disputes. Leave and absence management for a growing team covers the approval routing that produces those refusals, and Measuring absence: the rate, the trigger, the next step covers the sickness side, where carry-over rules and absence records meet.
Answered here.
- What are the four numbers to write down for each leave policy?
- When the leave year starts, how many days accrue over that year, how many unused days may cross into the next year, and the date carried days expire if untaken. Record them on the policy itself rather than in a handbook paragraph, so a balance can be recalculated from the policy at any point.
- How much annual leave can a UK worker carry over?
- GOV.UK states that workers can normally carry over a maximum of 8 days into the next leave year with the employer's agreement. Someone unable to take leave because of maternity or other family-related leave can carry forward up to 28 days, and a regular-hours worker who could not take leave because of sickness can carry forward up to 20 days, to be used within 18 months of the end of the leave year it accrued in.
- Does a use-it-or-lose-it policy work?
- Only where the law of that country allows it, and only if the employer has actually given people the chance to take the leave. In the UK, GOV.UK sets out cases where untaken leave carries forward regardless, including where an employer refused to recognise the right to annual leave, failed to give a reasonable opportunity to take it, or failed to tell workers it would be lost.
- How is leave accrued for part-year and irregular-hours workers in the UK?
- GOV.UK states that those workers build up leave according to the hours they have already worked rather than receiving a fixed number of days up front, and that for leave years beginning on or after 1 April 2024 entitlement is calculated as 12.07% of actual hours worked in a pay period.