Attrition rate helps organisations understand how many employees leave during a specific period and whether certain patterns are developing. When employees leave, teams may lose valuable experience, managers need to redistribute work, and HR has to prepare for changes in staffing and workload.
By tracking employee attrition, you can spot changes in your workforce, prepare for future staffing needs and identify where employees might need more support. When HR and payroll data are properly connected, you spend less time gathering numbers and more time understanding what they mean.
What is attrition rate?
Attrition rate measures the percentage of employees who leave an organisation during a specific period. Depending on the definition used, it may include all permanent departures or focus on positions that are not replaced. It helps HR teams understand workforce changes and identify potential risks to employee retention and business continuity.
Employee attrition can happen for several reasons. Someone might resign, retire or leave because their position is being eliminated. Some departures are expected, while others may come as a surprise. For HR professionals, attrition rate is a useful key performance indicator (KPI). It helps answer practical questions: Are more employees leaving than usual? Which departments are most affected? And what does this mean for recruitment, workload and payroll planning?
The term is sometimes used interchangeably with employee turnover rate. However, the two can describe different aspects of workforce movement, depending on how your organisation defines them.
How do you calculate attrition rate?
Calculating your attrition rate is straightforward. You need two figures: the number of employee departures included in your definition of attrition and the average number of employees working in your organisation during the reporting period.
Attrition rate formula
Attrition rate (%) = (Number of employee departures / Average number of employees) × 100
To calculate your average headcount, add the number of employees at the beginning and end of the period and divide the total by two.
Average headcount = (Starting headcount + Ending headcount) / 2
Using average headcount helps account for changes in workforce size during the reporting period. If employee numbers fluctuate significantly, calculating the average using monthly headcounts can provide a more representative figure. Some organisations use starting headcount instead, so make sure you document your method and apply it consistently.
Example: Calculating employee attrition
Imagine your organisation starts the year with 240 employees. During the year, 18 employees leave and 12 new colleagues join. This means you end the year with 234 employees.
First, calculate your average headcount: (240 + 234) / 2 = 237 employees. Next, calculate your attrition rate: (18 / 237) × 100 = 7.6%.
Your annual attrition rate is approximately 7.6%, assuming your organisation includes all 18 departures in its attrition calculation. If you only count positions that remain unfilled, you would need to identify those departures separately before applying the formula.
Tracking this percentage over several reporting periods helps you see whether employee departures are increasing, decreasing or remaining relatively stable.
What is the difference between attrition rate and turnover rate?
Attrition and turnover both measure employees leaving an organisation, but they can describe different situations. Understanding the distinction helps you interpret workforce data and make better staffing decisions.
Attrition rate is sometimes used specifically for employees leaving without their positions being replaced. For example, an experienced employee retires and the organisation decides to remove the position. In this definition, attrition can indicate a gradual reduction in workforce capacity.
Turnover rate generally measures employees leaving an organisation, regardless of whether someone new is hired to replace them. For example, an employee resigns and the organisation recruits someone else for the same position.
The main difference is that attrition may focus on positions that remain unfilled, while turnover typically includes departures from positions that are filled again. However, many HR professionals use attrition and turnover interchangeably to describe overall employee departures.
Before comparing figures across departments, countries or industry benchmarks, make sure everyone uses the same definitions and calculation methods.
What are the different types of employee attrition?
Knowing your overall attrition rate is useful, but the reasons behind employee departures tell you much more. By distinguishing between different types of attrition, you can understand which workforce changes are expected and where HR may need to take action.
Voluntary attrition
Voluntary attrition occurs when employees decide to leave an organisation. They may accept another job, change careers, relocate or retire. If voluntary departures increase in one department, it may be worth looking at workload, career development opportunities or employee feedback to understand what’s happening.
Involuntary attrition
Involuntary attrition happens when the employer initiates the departure. Examples include dismissals, redundancies and organisational restructuring. These departures should be analysed separately from resignations because the reasons, financial implications and actions required from HR are different.
Retirement and planned attrition
Some workforce changes can be anticipated. For example, an experienced payroll specialist may be approaching retirement. By identifying these changes early, you can arrange knowledge transfer, review team capacity and prepare a suitable replacement or alternative way of working.
Early employee attrition
Early attrition refers to employees leaving shortly after joining an organisation, often within their first year. Repeated departures among new hires may indicate a mismatch between job expectations and the actual role, or problems with onboarding and support. Tracking early attrition separately helps you investigate these possibilities without confusing them with departures among long-serving employees.
Why is attrition rate important for HR and payroll?
An employee leaving creates work across several departments. HR manages the departure process, payroll needs accurate information for the final salary calculation, and managers need to understand how the vacancy affects their team. Attrition data helps you prepare for these changes and make informed decisions about workforce planning.
Better workforce planning
When you know how many employees typically leave, you can make more informed decisions about recruitment and staffing. For example, if several experienced employees are expected to retire within the next two years, HR can discuss succession planning before their knowledge disappears from the organisation. This gives managers more time to prepare and reduces the risk of unexpected capacity shortages.
More reliable payroll planning
Employee departures involve important payroll activities. Depending on the country, employment contract and applicable rules, these may include final salary payments, unused leave balances, deductions or other termination-related payments. Accurate employee records and timely updates help payroll teams process these changes correctly.
For international organisations, local requirements may differ. A consistent HR data structure makes it easier to monitor departures across countries while respecting local payroll rules.
Understanding the costs of employee departures
Replacing an employee can involve recruitment expenses, onboarding time and reduced productivity while someone new learns the role. An unfilled vacancy may also increase the workload of remaining colleagues. By combining attrition data with recruitment and payroll information, you can better understand where employee departures affect costs and team capacity.
Spotting retention problems earlier
Imagine your organisation’s overall attrition rate remains stable, but one department loses several employees within a few months. A company-wide percentage may not reveal the problem, while looking at attrition by department, job role or length of employment can.
This gives HR a reason to investigate, speak with managers and review employee feedback before deciding what needs to change. It also helps you distinguish between expected workforce movement and patterns that deserve closer attention.
What is a good attrition rate?
There is no single attrition rate that is right for every organisation. A rate that is normal in an industry with seasonal employment may be concerning in an organisation with long-serving specialists. The reporting period, workforce composition and reasons for leaving all matter.
Instead of focusing on a universal target, compare your attrition rate with your organisation’s previous reporting periods, relevant industry benchmarks and attrition within specific teams, locations or job categories. Make sure external benchmarks use comparable definitions and time periods, otherwise the comparison may be misleading.
A low attrition rate is not automatically a sign of a healthy workplace. Likewise, a higher rate does not always mean employees are dissatisfied. Planned retirements, restructuring or changing business needs can also influence the figures. The most useful question is whether your attrition rate matches what you expect and whether unwanted departures are increasing.
How can you reduce employee attrition?
Reducing unwanted attrition starts with understanding why people leave. A single company-wide percentage cannot tell you that, but combining HR data with employee feedback can help you identify patterns and decide where improvements are needed.
1. Look for patterns in employee departures
Compare attrition across departments, locations and employee tenure. Check whether certain roles are affected more frequently and whether departures happen at particular moments, such as shortly after onboarding or following organisational changes. These patterns give you a starting point for further investigation.
2. Talk to employees before they leave
Regular conversations, employee surveys and stay interviews can reveal concerns that may not appear in an exit interview. Ask employees about their workload, development opportunities and experience with their manager. This gives you information you can act on while employees are still part of the organisation.
3. Review onboarding and expectations
If new employees leave quickly, investigate whether their experience matches what was discussed during recruitment. Clear expectations, practical onboarding and regular check-ins can help new colleagues settle into their roles and understand where to find support.
4. Make development opportunities visible
Employees should understand how they can develop their skills, take on responsibilities or explore different roles. Discussing career ambitions during regular conversations can help managers identify what employees need to keep learning and enjoying their work.
5. Give managers useful information
Managers need more than an annual company-wide attrition percentage. Give them relevant information about employee departures, team composition and workforce trends so they can recognise changes and discuss potential concerns with HR.
Not every departure can or should be prevented. The goal is to understand which departures deserve attention and take action where it makes sense.
How can HR use attrition data to improve workforce planning?
Tracking attrition over time helps HR understand how the workforce is changing and where future staffing challenges may arise. Rather than looking at employee departures as isolated events, organisations can use attrition data to identify trends, anticipate recruitment needs and prepare for changes in team capacity.
For example, if a department regularly loses experienced employees, HR can investigate the reasons and work with managers to improve retention. If several employees are approaching retirement, the same information can support succession planning, knowledge transfer and decisions about future recruitment.
Comparing attrition by department, job role, location and length of employment provides a more detailed picture than a company-wide percentage alone. It helps HR identify where unwanted departures are increasing, which teams may need additional support and whether retention initiatives are making a difference.
Reliable workforce planning also depends on accurate employee information. Start dates, end dates, organisational structures and employment records should be maintained consistently so that HR teams can compare reporting periods and recognise meaningful changes.
By combining attrition figures with recruitment plans, employee feedback and workforce forecasts, organisations can make better-informed staffing decisions. The goal is not simply to reduce the number of employees leaving, but to understand workforce changes and maintain the right skills and capacity for the future.