Attrition
Also known as: Employee turnover, Staff turnover
Attrition is the rate at which employees leave an organisation over a period, calculated as the number of departures divided by average headcount and expressed as a percentage. It spans voluntary attrition — people choosing to leave — and involuntary attrition, such as terminations and redundancies. Because the two have very different causes and cures, most organisations separate them, since a rise in voluntary attrition points to engagement or pay problems while involuntary attrition reflects business decisions.
The metric matters because every departure carries cost: the search to replace, the ramp of the replacement, the knowledge that walks out, and the load on the team in between. High attrition is also a signal in its own right — of a hot external market pulling people away, of internal problems pushing them out, or both. Tracking it by team, level, and tenure turns a single number into a diagnosis, revealing whether losses concentrate among new joiners, specific functions, or high performers, each of which calls for a different response.
In the Indian GCC and technology sector, attrition is watched especially closely because it can run high when the market is hot and skills are in short supply. It functions as a leading indicator of talent-market heat: rising attrition across a hub signals intensifying competition for the same people, which feeds through into compensation pressure and longer time-to-fill. For this reason attrition is a board-level metric in many GCCs, read alongside retention as the two sides of the same question — who leaves, and who stays.
Frequently asked questions
How is attrition calculated?
Attrition is calculated by dividing the number of employees who left over a period by the average headcount for that period, expressed as a percentage. Many organisations split the figure into voluntary and involuntary attrition, because the two have different causes and require different responses.
What is the difference between voluntary and involuntary attrition?
Voluntary attrition is when employees choose to leave, such as through resignation, while involuntary attrition is when the organisation ends the employment, such as through termination or redundancy. A rise in voluntary attrition usually signals engagement or pay problems, whereas involuntary attrition reflects business decisions.
Why is attrition a leading indicator of talent-market heat?
Attrition is a leading indicator of talent-market heat because rising voluntary attrition across a hub signals that competitors are pulling people away with better offers. That competition then feeds into compensation pressure and longer time-to-fill, so attrition often moves before those other metrics do.
What is the difference between attrition and retention?
Attrition measures the share of employees who leave over a period, while retention measures the share who stay — they are two sides of the same question. If annual attrition is 15 per cent, retention is broadly 85 per cent, and both are read together to understand workforce stability.