Promoting your best employee: the most costly mistake in your organisation

You have a standout in your team. Everything they touch works. Deadlines met, quality consistent, output reliable. Colleagues come to them for advice.

And then the thought forms: if they are this good as an individual contributor, they will make a great manager.

It is the most common mistake in talent management.

What happens next

Your best employee becomes a manager. And struggles.

Not because they are not smart or not motivated. But because the skills that made them excellent as an individual contributor have little to do with what is needed to lead a team.

As an individual contributor, you win by being better than others. As a manager, you win by making others better. Those are two fundamentally different disciplines.

And in the process, you also lose your best executor. They are now stuck in back-to-back meetings, having performance conversations they were never trained for, putting out fires they do not fully understand. The work that gave them energy is gone.

Technical excellence says nothing about leadership potential

This sounds obvious. And yet most organisations keep acting as if it is not true.

Leadership potential does not live in technical expertise. It lives in behaviour. In how someone communicates when things get tense. In how someone responds when a colleague pushes back. In whether people actually enjoy working with them, even when they are delivering difficult news.

Does someone ask questions or give answers? Do they seek connection or avoid conflict? Can they regulate themselves when the pressure builds?

Those are the indicators.

The question that rarely gets asked

Do I want the people on this team to be led by this person?

Not: are they good at their job? But: do people feel safe, heard and challenged by them?

That information does not live in performance files. It lives in the informal dynamics of the team. In who people instinctively turn to when a conversation gets difficult. In who makes sure the quieter colleague actually speaks up in a meeting.

Give potential a small assignment first

Do not promote based on performance. Test for potential.

Give someone a small stretch assignment. Have them mentor an intern. Onboard a junior team member. Coordinate a project without you hovering over it.

Then do not evaluate the outcome. Evaluate the behaviour. How do they handle someone who works more slowly? How do they respond when things go off track? Do they ask for help or push through until it breaks?

That tells you more than three years of performance reviews.

Make it explicit in your organisation

Say it out loud: leadership is a separate discipline. Technical ability and management capability are not the same thing.

Then tell people what you are looking for. Not in vague competency frameworks, but concretely. What does a good manager do at your organisation? How does someone behave in a conflict? What do you expect from someone who is developing others?

When people know what you are watching for, they start paying attention to it themselves. That is already a development intervention.

And when someone does have the potential?

Then the real work begins.

Potential that is not supported rarely delivers what it promises. A manager without structured guidance makes the mistakes you end up solving. With the accompanying absence, turnover and team friction.

For organisations that want to tackle this structurally, an in-company leadership development program built around your specific context makes the difference. Not a one-day event, but a trajectory with the repetition and transfer that real behaviour change requires.

For managers who want to work on this individually, I offer coaching for managers at every level, from the newly promoted team lead to the senior leader who wants to lead more deliberately on culture, trust and results.

---

Curious what this looks like for your organisation or your own role? Let's talk. Plan your free introduction here. Zero obligation.