Every year, in a company with high staff turnover, people leave, taking with them skills, customer relationships, organisational memory and productivity. The visible costs — recruitment, training a replacement, management time — are just the tip of the iceberg.

According to the Society for Human Resource Management, the true cost of each replacement ranges from 50% to 200% of the departing employee’s annual salary. For managerial or highly specialised roles, it can exceed 300%.

The true cost of staff turnover that nobody accounts for

The direct cost is easy to see: the hours spent recruiting, the selection costs, the months of onboarding during which the new hire is not yet operating at full capacity. But the indirect cost is often five times greater.

When an experienced person leaves, they take with them the client relationships they managed, the informal processes they knew that aren’t written down anywhere, the trust of the team they had built, and the know-how accumulated over years of work. All of this is lost and must be rebuilt — if it ever is fully.

There is also a knock-on effect. A departure, especially if voluntary and if the person was well-regarded, leads to an increase in private conversations within the team about opportunities elsewhere. Staff turnover is never an isolated event: it is a sign of an organisational problem which, if not resolved, leads to further departures.

The most common causes of voluntary turnover

HR data points to the same causes, in order of frequency.

Poor management. 70% of voluntary turnover is linked to the relationship with the line manager. A manager who fails to recognise contributions, does not delegate, does not support growth or manages arbitrarily is the main cause of losing the best talent.

Lack of career prospects. Employees with the most external market value — the ones you want to keep — are also the most sensitive to the absence of an internal development path. If they cannot see where they can go by staying, they will go elsewhere.

Pay imbalance. Not necessarily low salaries in absolute terms: salaries perceived as unfair in relation to the contribution made, or in relation to the market. Pay transparency has become an important retention factor, especially for younger generations.

Toxic organisational culture. Micromanagement, favouritism, lack of communication, a climate of mistrust. These factors drive people to leave even when they are well paid and the work is not difficult.

Burnout and overload. Particularly in SMEs with lean structures, there is a risk that the best people end up doing the work of two or three people. The result is exhaustion, loss of motivation and departure.

How to reduce staff turnover: the levers that work

There is no single solution. Staff turnover is a symptom of one or more organisational problems: identifying them precisely is the first step.

Structured exit interviews. Every voluntary departure is a learning opportunity. An exit interview conducted by an external person (not the line manager) using standardised questions yields far more useful data than informal conversations.

Stay interviews. Don’t wait for people to leave to ask them why. Stay interviews — structured conversations with the employees you want to retain — identify the risks of departure before they turn into resignations.

Defined career paths. For every key role, a clear roadmap of the skills required to progress, with objective criteria and indicative timelines. Not a vague promise: a system.

Management development. If managers are the main cause of turnover, investing in their skills offers the highest return on investment in HR.

Where to start

The first step is always diagnosis: understanding which of these causes is most relevant in your specific case. A company-wide HR Assessment maps critical areas and defines priorities for action using data, not impressions.

If staff turnover in your company has become a structural problem, start with an analysis session.