What is annual leave accrual?

Annual leave accrual is the process of building up holiday entitlement over time rather than viewing the full-year figure in isolation. It is commonly used for starters, leavers and variable-hours workers.

Do employees accrue holiday while off sick?

Yes. Statutory holiday continues to accrue during sickness absence. Employers should reflect that in their leave records.

Is 12.07% still used for holiday accrual?

It can be used in the modern framework for irregular-hours and part-year workers where the rules fit. Employers should make sure the worker category and leave year arrangement are correct before relying on it.

Should leave be tracked in days or hours?

For fixed working patterns, days can work well. For changing shifts or variable hours, tracking in hours usually creates fewer errors.

Annual Leave Accrual Calculator: Employer Guide

Annual leave accrual calculator pages matter because leave does not only get measured once a year. Employers constantly need to calculate leave built up by starters, leavers, staff on variable hours and workers returning from family leave or sickness absence.

This guide explains what annual leave accrual means, when you should use an accrual calculator instead of a full-year entitlement figure, and how to apply the result fairly and consistently in payroll and HR records.

What is an annual leave accrual calculator?

An annual leave accrual calculator estimates how much statutory or contractual annual leave a worker has built up over time. It is especially useful for new starters, leavers, irregular-hours workers and anyone whose entitlement is recorded in hours rather than days.

Accrual starts from day one

For regular-hours workers, annual leave begins to build up from the first day of employment. Employers can use a monthly accrual method in the first year where the rules allow.

When do employers use accrual calculations most?

when someone joins part way through the leave year
when someone leaves before the end of the leave year
when the worker has irregular hours or is part-year
when leave is tracked in hours
when long sickness or family leave affects entitlement records

Which accrual methods are commonly used?

For many regular-hours workers in the first year, employers use one-twelfth of annual entitlement per month. For irregular-hours and part-year workers, the modern approach often uses 12.07% of hours worked for the relevant leave year setup, subject to the current holiday reforms and payroll method.

Do not mix methods casually

Switching between monthly accrual and ad hoc pro-rata calculations without a clear policy creates inconsistent outcomes and increases challenge risk.

How should accrual be recorded in HR systems?

The strongest approach is to define the leave year, record the annual entitlement, track accrual earned, leave taken and balance remaining, and confirm whether bank holidays sit inside or outside the entitlement. This page supports Managing Annual Leave Requests UK, Managing Long Term Sickness Absence UK and the Annual Leave Accrual Calculator.

Accrual during sickness and family leave

Holiday continues to accrue during statutory maternity leave and during sickness absence. Employers should make sure managers do not freeze balances incorrectly just because a worker is absent from active work.

How can employers avoid accrual disputes?

Use one documented method, explain it in the handbook, train managers, and issue balance information clearly. If hours fluctuate, measuring leave in hours is usually easier to defend than trying to convert everything back into days after the event.

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Publish accrual rules in the handbook

A short handbook section explaining how leave builds up for starters, leavers and variable-hours workers removes a lot of avoidable manager confusion.

Annual leave accrual checklist for employers

Define the leave year clearly.
Choose a documented accrual method for each worker group.
Track leave in hours where patterns vary.
Confirm how bank holidays interact with entitlement.
Keep accrual running during sickness and statutory family leave.
Reconcile leave balances before final pay for leavers.
Pair this page with holiday entitlement guidance, return to work procedures and the Annual Leave Accrual Calculator.

Frequently asked questions

Free Template: Annual Leave Accrual Checklist

A practical checklist covering accrual methods, records and final pay checks.

annual-leave-accrual-checklist.pdf

Key takeaways

An annual leave accrual calculator page should help employers calculate leave built up over time, not just quote a full-year entitlement. Consistent methods, clear records and hour-based tracking for variable schedules make the biggest difference. This page should link closely to annual leave management, holiday entitlement rules and the Annual Leave Accrual Calculator.