The hidden cost of employee turnover: when talent leaves instead of moving internally

Replacing an employee involves much more than recruiting a successor.

According to Gallup, replacement costs can range from approximately half to twice an employee’s annual salary, depending on the role. Its more detailed estimates put the cost at around 40% of annual salary for frontline employees, 80% for technical professionals and 200% for leaders and managers.

These are estimates based on US research, not fixed costs that apply to every organisation. Nevertheless, they illustrate the potential financial impact of employee turnover.

Consider a specialist earning €60,000 annually. Applying Gallup’s 80% estimate would suggest a replacement cost of approximately €48,000.

And that is for just one employee…

The visible costs of replacing an employee

The most obvious expenses include recruitment, selection, onboarding and training.

There is also a productivity gap. A new employee needs time to become familiar with the organisation, understand its processes and build the relationships required to perform effectively.

Depending on the role, that transition can take months.

The less visible costs of losing talent

Some consequences are harder to quantify:

• Loss of organisational knowledge: experienced employees take valuable expertise, context and informal knowledge with them.
• Increased workload: colleagues often absorb additional responsibilities until a replacement is found.
• Project delays: ongoing work may slow down or lose continuity.
• Team morale: repeated departures can create uncertainty and affect engagement.
• Customer relationships: valuable professional connections may be disrupted.

These consequences help explain why employee turnover should not be treated as an isolated HR expense. It can affect productivity, collaboration and business continuity across the organisation.

Not every resignation can or should be prevented. People leave for many reasons, including compensation, personal circumstances, leadership, working conditions and new ambitions.

But there is one factor organisations can influence more directly: whether employees see opportunities to develop their careers internally.

In many organisations, career conversations still focus primarily on performance in the current role.
Employees receive feedback on what they do well, where they need to improve and how they can contribute more effectively to their existing team.

Their longer-term ambitions receive less attention. This can create several barriers to internal mobility.

An employee may hesitate to express an interest in another department because they fear being perceived as disloyal. Managers may be reluctant to lose their strongest performers. Internal vacancies may be visible, but employees may not recognise how their competencies could transfer to another role.

As a result, exploring opportunities outside the organisation can sometimes feel easier than discussing a different future within it.
The organisation loses someone who might have continued contributing in another capacity.

Employee retention is not simply about keeping people in the same position for as long as possible.
It is about creating an environment where employees can continue finding meaningful opportunities as their interests, competencies and ambitions evolve.

That requires a broader view of talent.

Someone who excels in an analytical role may have the transferable competencies and motivation to move into project management. An experienced technical specialist may be interested in developing people rather than progressing further as an individual expert.

These possibilities are not always visible through traditional job descriptions or performance evaluations.

A proactive internal mobility strategy helps organisations identify such opportunities before employees begin looking elsewhere.
It also allows organisations to make better use of existing talent, rather than automatically turning to external recruitment whenever a new capability is needed.

Making internal opportunities visible is important, but visibility alone is not enough.
Employees also need a clearer understanding of their own potential.

What are their strengths? Which activities give them energy? What motivates them? Which work environments suit them? And what would they need to develop to take on a different role?

These insights can turn career conversations into something more meaningful than an annual discussion about performance.
They also help managers and HR professionals look beyond the employee’s current job title.

An employee might discover opportunities they had never considered. A manager might recognise potential that is not fully used in the current team. HR can gain a broader perspective on the talent already available within the organisation.

Career development becomes a shared responsibility, supported by objective insights rather than assumptions alone.

By the time an employee announces their departure, the organisation may have limited room to respond. Counteroffers and last-minute promotions sometimes work, but they do not necessarily address the reasons someone started looking elsewhere.

A more sustainable approach begins earlier.
It gives employees the confidence to discuss their ambitions openly. It encourages managers to support development beyond their own teams. And it makes internal opportunities accessible to people whose potential may not be obvious from their career history.

This does not mean every employee will stay. But it gives organisations a better chance of retaining people who still have a future within the business, even if that future looks different from their current role.

The cost of employee turnover is not only what organisations spend replacing people.
It is also the potential they lose when employees cannot see where they could go next.