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What are annualised hours?

4 min. read
17 May 2023
01 Sep 2025
17 May 2023
4 min. read
01 Sep 2025

Annualised hours is a flexible work system that's growing in popularity in the UK. It ensures employees have a a steady income and provides employers with the ability to adjust staffing according to business needs. This guide will walk you through how it works, what the benefits are and how annualised hours compare to other employment contracts.

What are annualised hours?

Annualised hours are where an employee's working time is calculated over a year, rather than per week or month. This system is often used in sectors like retail, healthcare and manufacturing as they tend to experience more variable workloads and seasonal demands.

Annualised pay distributes an employee's salary evenly throughout the year, irrespective of the hours they've worked in a month. This provides a consistent income stream for the employee, while employers can effectively balance staffing with business demand.

Annualised hours vs other forms of employment

Understanding the nuances of annualised hours becomes clearer when comparing it to other common employment types in the UK.

Full and part-time work

Traditional employment types, such as full-time and part-time contracts, typically involve consistent weekly hours. Full-time contracts often mean a 35-40 hour work week, while part-time contracts involve fewer hours. The work schedule in these contracts is usually fixed and changes only in case of overtime or shift modifications.

Zero-hour contracts

Zero-hour contracts offer even more flexibility. These contracts don't guarantee any minimum hours, and employees only work when they're needed, often at short notice.

Annualised hours contracts, on the other hand, specify the total number of hours an employee must work over the year, but they don't define when these hours will be worked. This means that the distribution of hours can vary based on the needs of the business. This arrangement provides more flexibility, allowing employers to adjust staffing levels according to demand and helping employees balance work with other commitments.

While each contract type has its advantages and potential risks, annualised hours contracts can be particularly beneficial for businesses with significant seasonal fluctuations, where staffing needs change throughout the year. However, it's important to remember that the success of an annualised hours system relies heavily on effective management and clear communication between employers and employees.

How annualised hours contracts and shifts work

Instead of having a fixed work schedule, employees on an annualised hours contract have an annualised shift pattern that changes based on the workload. The pattern can vary week-by-week or month-by-month, offering greater adaptability. This flexible system requires careful planning and management to ensure that it meets both business requirements and legal obligations for employee work hours.

However, despite its complexity, an annualised hours contract can be an effective solution for businesses that experience significant seasonal fluctuations in demand. It allows organisations to maximise productivity during peak periods without overstaffing during quieter times, thus optimising operational efficiency.

How to calculate annualised pay

Annualised pay is based on the principle of evenly distributing an employee's pay across the entire year, no matter how many hours they work during a particular week or month. This provides employees with a stable income stream and helps employers with their budgeting and financial planning.

It starts with determining the total number of hours an employee is contracted to work in a year. This is done by multiplying the standard weekly hours by the number of weeks in the year.

Example

If an employee is contracted to work 40 hours a week, the total annual hours would be 2,080 (40 hours x 52 weeks).

Next, the annual salary is determined based on the contracted hours and the agreed hourly rate.

Example

If the hourly rate is £10, the annual salary would be £20,800 (2,080 hours x £10).

This annual salary is then divided evenly over the 12 months of the year to derive the monthly pay.

Using the previous example, the monthly pay would be £1,733.33 (£20,800 / 12).

How does holiday work with annualised hours?

In the UK the standard holiday entitlement for full-time workers is a minimum of 5.6 weeks of paid holiday per year, including bank holidays. For those on annualised hours contracts, this entitlement is usually calculated on a pro-rata basis relative to full-time hours.

To calculate holiday pay for an employee on an annualised contract, the UK government stipulates that you must consider the worker's average weekly earnings over the 12 weeks leading up to their holiday. This means adding up the total pay received over this period and dividing it by 12. This method ensures that fluctuations in work hours do not negatively affect an employee's holiday pay. Always remember to check current UK government guidelines for the most up-to-date legal requirements.

Annualised hours contracts and policies

A well-drafted contract should specify the total annual hours, distribution of hours, pay arrangements and overtime rules. It should also lay out procedures for managing annualised hours, including shift planning and adapting to demand fluctuations.

Are annualised hours right for your business?

Annualised hours offer numerous benefits, such as:

  • Flexibility

  • Improved work-life balance

  • Reduced overtime costs

However, they aren't without challenges. They require efficient management to prevent breaches of working time regulations and may cause dissatisfaction due to unpredictable schedules.

Wrapping up

Ultimately, annualised hours are a flexible and powerful tool for businesses that experience seasonal or periodic shifts in workload. While they offer benefits like improved work-life balance and reduced overtime costs, a successful system heavily relies on careful planning, clear communication and a well-written policy.

It's important to consider whether the annualised hours model aligns with your company's needs and culture before making any decisions.

Image from Unsplash published by morganhousel

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