Most organizations promote their best workers into supervisor roles and then leave them to figure out leadership alone. That choice quietly costs them a good employee, a struggling team, and a manager who never had a fair chance.
I made this mistake myself early in my career. One of my employees knew the job better than almost anyone, so when a management role opened, promoting him felt like an easy decision. At the time, I did not see the difference between knowing the job and being prepared to lead the people who do it.
He received no formal training. No one explained the employment laws that shape how managers must treat their people. The result was a pattern of decisions that consistently violated those laws. It was not bad intent. He simply did not know the rules, and no one had taught him.
That experience changed how I think about promotions. The failure was not his alone. It also belonged to the leaders, including me, who gave him the title without the preparation. It is a mistake I still see organizations make every day.
Why We Keep Doing This
We promote top performers because it feels fair and it feels safe. The person earned it. They know the work. Their numbers prove they can deliver.
There is also a practical pull. Hiring an outside supervisor takes time and money. Promoting from within is fast, rewards loyalty, and shows the rest of the team that hard work pays off. Those are good reasons.
Research backs this up. Matthew Bidwell of the Wharton School studied six years of personnel records at a large investment bank. Employees promoted from within earned better performance reviews in their first two years than outside hires in similar jobs. They were also less likely to quit or be let go. Yet the outside hires were paid about 18 percent more. (Bidwell, 2011)
In my experience, the reason is simple. People promoted from within already know how the company really works: the systems, the unwritten rules, the customers, and who to call when something breaks. An outside hire can take two years to learn what an internal candidate already knows.
The problem is not the promotion. The problem is the assumption behind it: that being great at the job means being ready to lead the people who do the job. Those are two different skill sets. When we treat them as one, we set people up to fail. Back in 1969, Laurence Peter gave this pattern a name, the Peter Principle: people get promoted until they land in a role they were never prepared for. More than fifty years later, many organizations still run on it.
Recent research shows the Peter Principle is more than a joke. Economists Alan Benson, Danielle Li, and Kelly Shue studied nearly 40,000 sales workers at 131 companies. Companies promoted their top sellers, but those top sellers turned out to be weaker managers. (Benson, Li & Shue, 2019)
Gallup reached a similar conclusion. Its research found that companies choose the wrong person for a management role 82 percent of the time. When Gallup asked managers why they were promoted, most pointed to their success in a previous non-management job or their years with the company. (Gallup)
So promoting from within is a smart strategy. Choosing who to promote, and preparing them, is where companies go wrong.
Doing the Work vs. Leading the Work
The habits that make someone a star employee can work against them as a supervisor. A top performer succeeds by doing. A supervisor succeeds by helping others do.
| What made you a top performer | What the supervisor role needs |
|---|---|
| Solving problems yourself, fast | Teaching others to solve problems |
| Focusing on your own numbers | Watching the whole team’s numbers |
| Being one of the team | Holding friends and peers accountable |
| Knowing the right answer | Asking questions that help others find it |
| Working harder when things get busy | Planning ahead so the team is not overwhelmed |
| Getting praise for results | Giving credit to others for results |
None of these supervisor skills are rare or mysterious. They can be taught. But they are rarely taught before someone needs them. Most new supervisors learn by trial and error, and their teams pay for the errors.
The hardest shift is often personal. Yesterday you were a peer. Today you approve time off, write reviews, and address performance. Some former coworkers will test you. Some will resent you. Without guidance, many new supervisors either become too friendly to set limits or too strict to keep trust.
What It Really Costs
An unprepared promotion rarely fails in a single dramatic moment. It fails slowly, in three places at once.
The new supervisor pays first. They lose the job they were great at and take on one they were never shown how to do. Stress rises. Confidence drops. Many quietly ask to step back down, or they leave the company altogether. Either way, you have lost your best performer.
The team pays next. Without coaching, struggling employees keep struggling. Good employees get frustrated when problems go unaddressed. Rules get applied unevenly, which feels unfair even when no one means harm. People rarely leave a company because of the work itself. They often leave because of the person they report to.
The organization pays last, and most. Customer experience slips. Turnover goes up, along with the cost of hiring and training replacements. Mistakes in handling discipline, leave, or complaints can also create legal risk. As I learned firsthand, a manager who does not know the rules can expose the company without ever intending to.
The irony is hard to miss. We promoted our best person to strengthen the team. Without support, we weakened it instead.
What to Do Instead
The fix is not to stop promoting from within. It is to prepare people before they need the skills and support them after they start.
Before the promotion
- Separate the two questions. Ask “Is this person great at the job?” and “Has this person shown they can lead?” as two different questions. Look for signs like helping peers, staying calm under pressure, and giving honest feedback. In the Benson study, workers with experience selling as part of a team made better managers than solo stars, yet companies were no more likely to promote them.
- Create a trial path. Let interested employees lead a huddle, train a new hire, or cover for a supervisor for a week. They learn whether they like leading. You learn whether they are ready.
- Make it okay to say no. Some top performers do not want to manage. Offer another way to grow, such as a senior or specialist role with higher pay, so leading people is not the only path to a raise.
After the promotion
Timing matters. Jack Zenger of the leadership firm Zenger Folkman reviewed 17,000 leaders in his company’s programs. Their average age at their first leadership training was 42, while the supervisors at those same companies averaged 33. Many supervisors, he concluded, lead for about ten years before anyone trains them. (Zenger Folkman)
The good news is that training works when it comes early. Gallup found that about two in 10 people have a basic talent for managing and can perform at a high level when their company invests in coaching and development.
- Train in the first 30 days, not the first year. Cover the basics right away: coaching conversations, attendance and discipline rules, reading team reports, and when to call HR.
- Assign a mentor. Pair every new supervisor with an experienced leader who is not their boss. A safe person to ask “How do I handle this?” prevents many mistakes.
- Check in on purpose. Meet weekly for the first 90 days. Ask what is hard, not just what the numbers say.
- Measure leadership, not just output. Track team turnover, coaching time, and employee feedback alongside performance results. What you measure tells new supervisors what matters.
The Bottom Line
Promoting your best people is a good instinct. Leaving them unprepared is not. Every new supervisor deserves the same thing we give every new hire: training, a guide, and time to learn.
If you are a leader, look at the last three people you promoted. What did you give them besides a new title? If you are a new supervisor, it is not a weakness to ask for help. It is the first leadership skill.
Have you been promoted without preparation, or watched it happen to someone else? I would like to hear what helped and what did not. Join the community conversation, and subscribe to the newsletter for new articles on leadership and operations.
Sources
- Bidwell, M. (2011). Paying More to Get Less: The Effects of External Hiring Versus Internal Mobility. Administrative Science Quarterly, 56(3).
- Benson, A., Li, D., & Shue, K. (2019). Promotions and the Peter Principle. Quarterly Journal of Economics, 134(4).
- Beck, R. J., & Harter, J. Why Great Managers Are So Rare. Gallup.
- Zenger, J. (2012). We Wait Too Long to Train Our Leaders. Harvard Business Review; republished by Zenger Folkman.
- Peter, L. J., & Hull, R. (1969). The Peter Principle: Why Things Always Go Wrong. William Morrow.
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