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Guide to the Organisation of Working Time Act 1997

Written by HRLocker | Oct 22, 2025 1:19:22 PM

Understanding and complying with Irish employment law is fundamental for any HR manager or business owner. The Organisation of Working Time Act 1997 is a cornerstone of this legislation, setting out the legal framework for employee working hours, rest periods, and leave entitlements. Navigating its complexities is essential for ensuring compliance, protecting your business, and fostering a fair work environment.

This article breaks down the key components of the Act, helping you manage your obligations with confidence. We will cover maximum working hours, statutory rest breaks, annual leave, and record-keeping duties to prepare you for potential WRC inspections.

What is the Organisation of Working Time Act 1997?

The Organisation of Working Time Act 1997 is the primary legislation governing employees’ hours of work in Ireland. Its primary purpose is to protect employees’ health and safety by setting minimum standards for rest and maximum limits on working time. It also establishes entitlements to paid annual leave and public holidays.

Who Does the Act Apply To?

The Act applies to nearly all employees in Ireland. However, there are specific exemptions for certain sectors and roles where the nature of the work requires more flexibility. These include:

  • The Gardaí and the Defence Forces.
  • Self-employed individuals.
  • Employees who have autonomous decision-making power and can control their own working hours (often referred to as “managing executives”).
  • Family members working on a family farm or in a private home.

Even where exemptions apply, employers are still expected to ensure their employees’ health and safety.

Key Provisions of the Act

The Act outlines several critical rules that employers must follow. These regulations form the bedrock of fair working time practices in Ireland.

Maximum Weekly Working Hours

A central pillar of the Act is the limit on an employee’s average working week. An employee’s average working hours must not exceed 48 hours in any seven days.

This 48-hour limit is not a strict weekly cap but an average calculated over a reference period. For most employees, this reference period is four months. It can be extended for up to six months for specific activities (e.g., security, hospitals, tourism) or up to twelve months through a collective agreement approved by the Labour Court.

Minimum Rest Breaks

Employees are legally entitled to specific rest periods during and between working days.

  • Daily rest: An employee is entitled to a rest period of 11 consecutive hours within each 24 hours.
  • Weekly rest: In each seven-day period, an employee must receive a 24-hour rest period, which should follow a daily rest period (totalling 35 hours of consecutive rest).

In-Work Breaks

The Act also mandates breaks during the working day to prevent fatigue.

  • After 4.5 hours: An employee who works more than 4.5 hours is entitled to a break of at least 15 minutes.
  • After 6 hours: If an employee works more than 6 hours, their break entitlement increases to at least 30 minutes. This 30-minute break can include the initial 15-minute break.

It is important to note that the Act does not require these breaks to be paid. Whether breaks are paid or unpaid should be specified in the employee’s contract of employment.

Annual Leave and Public Holiday Entitlements

The Act establishes minimum paid annual leave entitlements for employees.

Calculating Annual Leave

All full-time employees are entitled to at least four working weeks of paid annual leave per year. Part-time employees’ entitlements are calculated pro rata. There are three primary methods to calculate this:

  • 4 working weeks in a leave year in which the employee works at least 1,365 hours.
  • One-third of a working week for every calendar month in which the employee works at least 117 hours.
  • 8% of the hours an employee works in a leave year (subject to a maximum of 4 working weeks).

The method that provides the most significant benefit to the employee should be used. Employers must determine the timing of an employee’s annual leave, though this should be done in consultation with the employee, taking into account their family responsibilities and work requirements.

Can Annual Leave Be Carried Over?

Generally, annual leave should be taken within the leave year it is accrued. However, carryover is permitted if the employee is unable to take their leave due to illness. In such cases, the leave must be taken within 15 months of the end of the leave year.

Public Holiday Entitlements

Employees in Ireland are entitled to paid leave on public holidays. If an employee is required to work on a public holiday, they must be compensated with one of the following:

  • A paid day off within a month.
  • An additional day of annual leave.
  • An additional day’s pay.

Part-time employees are also entitled to public holiday benefits, provided they have worked at least 40 hours in the five weeks leading up to the public holiday.

Rules for Night Work

The Act provides specific protections for night workers. A night worker is someone who usually works at least three hours of their daily shift during “night time” (between midnight and 7 am) and whose night-time work totals at least 50% of their annual working hours.

Key obligations for employers include:

  • Night workers must not work more than an average of 8 hours in any 24 hours.
  • Employers must offer a free health assessment to night workers before they start night work and at regular intervals thereafter.
  • If a registered medical practitioner finds that an employee is medically unfit for night work, the employer must, if possible, transfer them to suitable day work.

Record-Keeping and WRC Inspections

Maintaining accurate and complete records is a legal requirement under the Act and is crucial for demonstrating compliance during an inspection by the Workplace Relations Commission (WRC).

Employers must keep detailed records of:

  • The number of hours worked by employees on a daily and weekly basis.
  • Records of all leave and public holidays taken by each employee.
  • That payments for this leave have been made.
  • Start and finish times.

These records must be kept for at least three years. Failure to maintain proper records can result in penalties. An inspector from the WRC can enter premises at any reasonable time to inspect records and ensure compliance with the Act.

Simple Compliance Checklist

  • Do you have a system to accurately track all employees’ working hours?
  • Are you calculating the 48-hour average week over the correct reference period?
  • Are employees receiving their statutory daily, weekly, and in-work rest breaks?
  • Is your annual leave calculation compliant with the Act’s three methods?
  • Are you managing public holiday pay and entitlements correctly?
  • For night workers, are you providing health assessments and adhering to the 8-hour average limit?
  • Are you retaining all working time records for at least three years?

Frequently Asked Questions (FAQ)

1. What is considered “working time” under the Act?
Working time is defined as any period during which an employee is at their place of work, at their employer’s disposal, and carrying out their activities or duties. It typically does not include rest breaks during which the employee is free to do as they please, commuting time, or time spent on standby outside the workplace.

2. Can an employee opt out of the 48-hour work week?
No. Unlike in some other countries, employees in Ireland cannot opt out of the 48-hour average working week.

3. Are unpaid interns covered by the Act?
If an individual is considered an “employee” under a contract of employment, they are covered. An intern performing work of value, rather than simply observing or shadowing, might be deemed an employee. The specifics of the arrangement are key.

4. What happens if an employee works for more than one employer?
An employer cannot require an employee to work hours that would exceed the limits set by the Act. Employers should ask new hires if they have other employment to ensure they do not inadvertently breach these rules.

5. How do zero-hour contracts fit with the Act?
The Employment (Miscellaneous Provisions) Act 2018 significantly limits the use of zero-hour contracts. Employees must receive a “banded hours” contract reflecting their average working week if their contract does not accurately reflect the hours they actually work.

Master Your Compliance Obligations

The Organisation of Working Time Act 1997 is detailed, and ensuring full compliance requires careful management and robust systems. Keeping accurate records and understanding your obligations is the best way to protect your business and support your employees.

To help you navigate every detail with confidence, we have developed a comprehensive guide. Download our free Understanding the Organisation of Working Time Act 1997 guide today to access checklists, detailed examples, and expert insights.