How to Calculate Statutory Annual Leave in Ireland
June 12, 2025
Annual leave entitlements are a fundamental part of every employee’s contract. But when it comes to calculating statutory annual leave, particularly for employees with variable hours, many employers are unsure of the rules.
In Ireland, annual leave is governed by the Organisation of Working Time Act 1997. The Act outlines how much paid leave employees are entitled to, depending on how and when they work.
Here’s what employers need to know.
The Statutory Entitlement
Under Irish law, employees are entitled to paid annual leave based on the time they work, up to a maximum of four working weeks per leave year.
The statutory entitlement applies to all employees, whether they’re:
- Full-time or part-time,
- Permanent, fixed-term, or temporary,
- Working regular or variable hours.
If an employee works less than full time or for only part of the year, their leave is calculated on a pro-rata basis. Employers can always offer more generous contractual leave, but they must not go below the statutory minimum.
Three Ways to Calculate Annual Leave
There are three approved methods for calculating annual leave. Employers must use the most favourable option for the employee.
1. 1,365-Hour Rule (Full-Time Equivalent)
If an employee works at least 1,365 hours in a leave year, they qualify for the maximum of four working weeks of paid annual leave.
This method generally applies to full-time employees.
2. One-Third of a Working Week per Month (Capped at four weeks)
An employee who works at least 117 hours in a calendar month is entitled to one-third of their normal working week as annual leave for that month.
This method suits part-time workers with consistent hours.
3. 8% of Hours Worked (Capped at Four Weeks)
Employees with irregular or variable hours are entitled to 8% of the hours they work in a leave year, capped at four working weeks.
For example:
- An employee works 1,000 hours in a year.
- 8% of 1,000 = 80 hours of annual leave.
- If their average working week is 20 hours, that’s four weeks’ worth of leave.
- If they work only 500 hours, they earn 40 hours — which may be less than four weeks, depending on their average week.
Important: The 8% rule is helpful for casual and variable-hours employees, but the cap of four weeks still applies. Employers must ensure they do not exceed the statutory maximum unless their contract or policy provides for more.
Public Holidays Are Separate
Public holidays are not included in annual leave calculations. Employees are entitled to public holiday benefits once they’ve worked at least 40 hours in the five weeks before the holiday.
The employer can choose to give:
- A paid day off,
- An extra day’s annual leave,
- A paid day off within a month, or
- An extra day's pay.
Keeping Track of Leave
Employers must keep records of:
- Hours worked,
- Leave accrued,
- Leave taken.
These records should be retained for at least three years. Good recordkeeping is particularly important for variable hours employees.
A Note on Carryover
Statutory annual leave must generally be taken within the leave year, or in exceptional circumstances, within six months of the end of the leave year.
If the employee was unable to take the leave due to illness, they have up to 15 months from the end of the leave year to take it.
Need Support
At MSS The HR People, we work with Irish SMEs every day to manage leave entitlements, review employment contracts, and stay compliant with evolving employment legislation.
If you’re unsure about your approach to annual leave, especially for part-time or flexible workers, get in touch. We’re here to help.
Ph: 018870690 / Info@mssthehrpeople.ie
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