A holiday year (also called a leave year) is the fixed 12-month period over which an employee’s annual leave entitlement is calculated, taken, and reset. It is the boundary that decides when leave accrues, when it expires, and what has to be carried over.
Choosing your holiday year dates is one of the cheapest HR decisions you will ever make and one of the easiest to regret. Pick badly and you get a December scramble, a payroll reconciliation that never quite balances, and a pro-rating calculation you have to redo for every new starter.
Key takeaways
- Statutory annual leave in the UK is 5.6 weeks per leave year under the Working Time Regulations 1998.
- If your contracts say nothing, the law sets a default leave year for you, usually the anniversary of the employee’s start date.
- Calendar year and 1 April to 31 March are the two common fixed options. Anniversary dates are fairest but the most admin.
- Most statutory leave cannot be carried over or paid in lieu, so the year boundary matters.
What Is a Holiday Year?
A holiday year is the 12-month reference period an employer uses to measure annual leave entitlement. Under regulation 13 of the Working Time Regulations 1998, a worker is entitled to statutory paid annual leave “in each leave year”, and the combined statutory entitlement is 5.6 weeks, as gov.uk confirms.
The holiday year is not the same thing as the tax year, the financial year, or the accrual period used by payroll. Those may align with it, and often should, but they are separate concepts. If you want a refresher on how 5.6 weeks translates into days, read our UK annual leave entitlement guide.
Does UK Law Set Your Holiday Year Dates?
Only if you do not. Regulation 13(3) of the Working Time Regulations 1998 provides a default: where there is no relevant agreement fixing the leave year, it begins on the date the worker’s employment started and on each subsequent anniversary.
That default is why so many small employers discover, years in, that every employee is on a different leave year. The fix is straightforward. Set the leave year explicitly in the employment contract or a written workplace agreement, and every worker moves onto the same dates.
Which Holiday Year Should You Choose?
Three patterns cover almost every UK employer. Each trades administrative simplicity against fairness and against year-end pressure.
Calendar year: 1 January to 31 December
The most common choice, and the most intuitive for employees. Everyone knows when the year resets, and team planning conversations are easy.
The cost is a year-end crunch. December is already thin on working days because of the Christmas bank holidays, and it collides with the point at which unused leave expires. If you use a calendar year, expect a November and December where operational cover is your hardest problem.
Tax year: 1 April to 31 March
Aligns your leave year with the UK tax year, payroll year end, and, for many organisations, the financial year and appraisal cycle. Accrued holiday liability lands in the same period as the rest of your year-end accounting, which finance teams tend to appreciate.
The year end falls in late March, a quieter period for most businesses than late December, so the leave crunch is easier to absorb. The trade-off is that employees find it less intuitive, and Easter can sit awkwardly on either side of the boundary depending on the year.
Employee anniversary date
Each employee’s leave year runs from their own start date. This is the statutory default and it is the fairest option: no pro-rating is ever needed, because everyone gets a full entitlement over a full year.
It is also the heaviest to administer. You have a rolling year end every month, carry-over conversations that never stop, and a holiday liability figure that changes constantly. In our experience this only works well when a system is doing the counting for you.
At a glance
| Holiday year | Payroll alignment | New-starter pro-rating | Carry-over admin | Year-end crunch |
|---|---|---|---|---|
| 1 Jan to 31 Dec | Weak | Required | One annual peak | High (December) |
| 1 Apr to 31 Mar | Strong | Required | One annual peak | Moderate (March) |
| Anniversary date | Weak | Not needed | Continuous | Spread across the year |
How Do You Choose? A Four-Question Test
Work through these in order. The first clear answer usually settles it.
- Does your business have a hard seasonal peak? Put the year end away from it. Retail and hospitality should avoid a December year end.
- Who owns the leave admin? If it is one person doing it manually, choose a fixed year. Anniversary dates without software are a permanent job.
- Does finance need holiday liability to match the accounting year? If yes, 1 April to 31 March is usually the better fit.
- How many people join mid-year? Heavy hiring makes pro-rating a recurring cost, which pushes slightly towards anniversary dates if you have a system to run them.
What Happens to Leave at the Year Boundary?
The default position is strict. Regulation 13(9) of the Working Time Regulations 1998 provides that statutory leave may only be taken in the leave year in which it is due, and it cannot be replaced by a payment in lieu except where employment ends.
Three exceptions matter in practice:
- Sickness. A worker who could not take leave because of long-term sickness must generally be allowed to carry it over.
- Family leave. Leave that could not be taken because of maternity, paternity, adoption, or shared parental leave carries over.
- Employer failure. Where an employer has not given the worker a genuine opportunity to take leave, the leave carries over rather than expiring.
Contractual leave above the statutory 5.6 weeks is entirely yours to define. Many employers allow three to five days to be carried into the first quarter of the new year. Our guide to carrying over annual leave in the UK sets out the detail, including the different treatment of the first four weeks and the additional 1.6 weeks.
One practical lever most employers forget: under regulation 15 of the Working Time Regulations 1998, you can require a worker to take annual leave on specified dates, provided you give notice of at least twice the length of the leave. Two days’ leave needs four days’ notice. Used early, that stops the year-end pile-up before it forms.
How Do You Pro-Rate Leave for New Starters and Leavers?
For a fixed holiday year, a new starter’s entitlement is the proportion of the leave year they will actually work. Someone joining on 1 July with a 1 January leave year gets roughly half of the annual entitlement. The gov.uk holiday entitlement calculator is the reference tool, and it handles part-year and irregular-hours cases too.
Leavers work the same way in reverse. You compare leave accrued to the termination date against leave taken, then pay the balance or, if your contract allows it, recover an overpayment. Part-time patterns need care, and our guide to calculating holiday entitlement for part-time staff walks through the arithmetic.
Round pro-rated entitlement up, not down. Rounding down risks dropping a worker below the statutory minimum, which is the one outcome you cannot contract out of.
Frequently Asked Questions
Can you change your holiday year?
Yes, but it is a contractual change, so you need employee agreement and clear written communication. The usual approach is a one-off transitional period, either a short bridging year or an extended one, with entitlement pro-rated across it. Give plenty of notice and confirm every individual’s revised balance in writing.
Do bank holidays have to fall inside the holiday year entitlement?
There is no statutory right to bank holidays off, and employers may count them within the 5.6-week entitlement. What matters is that your contract is explicit about whether they are included or additional. Our UK bank holidays employer guide covers the wording.
Can different teams have different holiday years?
Legally yes, since the leave year is set by agreement. Practically it is a poor idea. Two leave years means two reporting cycles, two carry-over deadlines, and constant confusion when people move between teams.
What is the difference between a holiday year and an accrual period?
The holiday year is the 12-month window entitlement belongs to. The accrual period is how that entitlement builds up within the window, for example monthly or per hour worked. You can accrue monthly inside an annual leave year running 1 April to 31 March.
Set Your Holiday Year Once, Then Stop Thinking About It
Whichever dates you choose, the work is the same: pro-rate new starters, apply carry-over rules consistently, and see the year-end crunch coming early enough to do something about it. Leave Balance lets you set a company-wide holiday year or run anniversary-based years, pro-rates new starters automatically, and shows you the carry-over position before the deadline arrives.
leave emails? Track your employee's leave with Leave Balance
Last updated: 26 July 2026. This article is general guidance, not legal advice. Verify the current position on gov.uk or with a qualified UK employment solicitor before applying it to a specific case.