The Peter Principle Is Alive in Your Firm. Executive Coaching & Leadership Development Is How You Stop It.

You promoted your best analyst. She was methodical, commercially sharp, and clients loved her. Six months later, her team is underperforming, two good people have left, and you are quietly wondering whether the promotion was a mistake.

It was not a mistake, exactly. It was something older and more predictable: the Peter Principle, alive and operating at your expense.

What the Research Actually Shows

In 1969, Laurence Peter and Raymond Hull published a book intended as satire. Their central proposition, that in any hierarchy every employee tends to rise to their level of incompetence, was meant to be funny. Organisations took it seriously because it described something they recognised. Fifty years later, the evidence base has caught up with the joke.

In 2019, economists Alan Benson, Danielle Li, and Kelly Shue published the first large-scale empirical test of the Peter Principle in the Quarterly Journal of Economics. Studying the performance of over 53,000 sales workers across 214 firms, they found that the best individual performers were significantly more likely to be promoted into management, and that those same individuals were more likely to perform poorly as managers. A doubling of a salesperson's pre-promotion performance corresponded to a 14.3% increase in the probability of promotion. It also corresponded to a 7.5% decline in the sales performance of their new team. The best workers were not the best managers. The firms promoted them anyway.

This matters particularly in financial and professional services, where the pattern maps almost precisely onto how careers are typically structured. The high-billing solicitor becomes managing partner. The exceptional analyst becomes head of research. The top fee earner becomes the line manager of ten other fee earners. At each transition, the skills that created success at one level, technical precision, individual drive, personal credibility, are not the skills required at the next level, which demands clarity of communication, delegation, performance management, emotional regulation, and the ability to develop others.

Gallup's research reinforces the scale of the problem. Managers account for approximately 70% of the variance in employee engagement across business units. In its most recent State of the Global Workplace report, Gallup found that manager engagement fell from 30% to 27% between 2023 and 2024, driving a wider decline in overall engagement to 21% globally, a drop the firm estimated cost the world economy $438 billion in lost productivity. Gallup's chief workplace scientist was direct: business performance is at risk if executive leaders do not address manager breakdown.

The Specific Cost to UK Organisations

The economics are stark at a domestic level too. The Health and Safety Executive's most recent estimates put the total cost of workplace ill health in Britain at £22.9 billion in 2023/24, with stress, anxiety, and mental health conditions forming a significant share of the burden. The Institute for Public Policy Research calculated the hidden cost of employee sickness at £103 billion in 2023, a figure that had risen by £30 billion since 2018. The CIPD's joint research with Simplyhealth found that employees were absent an average of 7.8 days over the past year, up from 5.8 days before the pandemic. Of that increase, the greater portion is driven not by sick days themselves but by presenteeism, the quiet drain of people working through poor health because they feel they have no choice.

Poor management is a primary driver of work-related stress. When someone is promoted into a role they are not equipped to handle, the consequences are distributed: to them, to their team, and to the wider organisation. The promoted person may feel exposed, underprepared, and reluctant to admit difficulty. The team they manage may experience unclear direction, inconsistent feedback, and the low-grade anxiety of reporting to someone visibly struggling. Some will disengage. Some will leave. A smaller number will end up in formal capability or conduct processes that are expensive, time-consuming, and avoidable.

Employment relations cases in financial and professional services are rarely cheap. A poorly handled capability process can run to tens of thousands of pounds in management time, legal fees, and potential settlement. The CIPD notes that replacing an employee lost to ill health costs employers over £11,000 in recruitment and onboarding alone. These costs are measurable. The damage to team morale and client relationships typically is not, which means the true figure is higher than most finance directors see on a spreadsheet.

Why the Problem Persists

If the evidence is this clear, why do organisations keep promoting the wrong people in the wrong way?

Part of the answer is structural. Promotion is not just an allocation decision; it is also an incentive mechanism. Firms use the prospect of promotion to motivate performance at lower levels. Removing that incentive, or making it conditional on attributes that are harder to observe or articulate than sales figures, creates its own risks. Benson, Li, and Shue found that firms in their study appeared aware of this trade-off. They weighted promotion less heavily on raw performance in contexts where incentive pay was already high, and where the managerial role involved greater responsibility. But the correction was partial. The underlying pattern held.

A second part of the answer is cultural. In high-pressure professional services firms, the default assumption is that exceptional technical performers will adapt. They are intelligent. They have survived demanding environments. Surely they can figure out management. This assumption is not unreasonable on its face. It is wrong in practice often enough to constitute a systematic failure. Management is a distinct discipline. It requires a specific set of capabilities: the ability to hold difficult conversations, to give and receive feedback effectively, to delegate without abdicating, to set direction without micromanaging, and to recognise and support colleagues whose needs and working styles differ from your own. These are learnable skills. They are not automatically present in someone who happens to be technically excellent.

Gallup's research found that only around one in ten people promoted into management roles have the innate talent combination to manage effectively without structured development. A further two in ten can function at a high level with the right investment in coaching and development. That leaves a majority of promoted managers working at levels below what their teams and organisations need, not because they are incompetent people, but because they were asked to perform a role they were not prepared for.

What Executive Coaching Actually Does

Executive coaching is not remedial. In high-performing professional services firms, it is increasingly standard practice for leaders at director level and above, and increasingly at senior manager level too. The evidence for its effectiveness is consistent.

The International Coaching Federation's 2023 Global Coaching Study found that 86% of organisations reported a positive return on investment from coaching, with a median company return of approximately seven times the initial investment. A survey of 100 executives cited by the ICF found an average return of nearly six times the cost. A PwC and Association Resource Centre study found a median ROI of seven to one. These numbers are not marketing claims. They reflect measurable changes in leadership behaviour, team performance, retention, and decision quality.

For leaders navigating a promotion into management, coaching does several things that training alone cannot. It creates a private space in which the individual can be honest about what they find difficult, something that is near impossible to do in a firm where vulnerability is not culturally rewarded. It builds self-awareness about how their behaviour affects others, using tools such as psychometric profiling and 360-degree feedback. It supports the development of a specific leadership identity, separate from the technical expert identity that has until now defined their professional sense of self. And it provides ongoing accountability for the behavioural changes that development requires.

Research published in the International Journal of Evidence Based Coaching and Mentoring found that 75% of respondents reported the value of executive and leadership coaching as considerably greater than the time and money invested. The ICF found that 80% of coachees reported increased self-confidence, and 70% reported improved work performance, relationships, and communications. Research also shows that training alone produces an average productivity increase of 22%; when combined with coaching, that figure rises to 88%. The difference is not small.

The HR and People Leadership Perspective

For HR and people leadership in financial and professional services firms, the Peter Principle presents both a risk and an opportunity.

The risk is the one already described: promoting technical experts without providing the developmental infrastructure to support the transition into management. This produces a predictable cascade of problems. Performance issues among newly promoted leaders. Engagement and retention problems in their teams. A steady flow of capability conversations, grievances, and employment relations cases that consume disproportionate amounts of HR time and create avoidable legal exposure.

The opportunity is the creation of a development culture. This is not a phrase to deploy lightly. A genuine development culture is not a suite of e-learning modules or an annual appraisal process that nobody takes seriously. It is an environment in which learning, feedback, and growth are treated as professional responsibilities at all levels. In such cultures, coaching is not a remedial intervention reserved for people who are struggling; it is a standard expectation for anyone who leads others, regardless of seniority.

Firms with strong coaching cultures show measurably better outcomes. According to research by the Human Capital Institute, companies with strong coaching cultures are more likely to outperform their industry peers in revenue. Gallup found that top-performing teams show 78% less absenteeism, a 10% improvement in customer loyalty and engagement, and 23% higher profitability compared with their lower-performing counterparts. These differences trace back, consistently, to the quality of management.

The other dimension of HR's role is in reshaping how promotion decisions are made. The Benson, Li, and Shue research found that firms with stronger incentive pay structures weighted promotion less heavily on raw performance, and that firms making appointments to roles involving greater managerial responsibility were more careful about whom they selected. The lesson is not to stop promoting high performers; it is to supplement current performance data with a more deliberate assessment of managerial readiness, and to build the development structures that close the gap between the two.

The Business Case for Doing the Right Thing

In financial and professional services, the business case for investing in leadership development is not difficult to make. It is only difficult to make if you are calculating the cost of coaching against an imagined baseline in which nothing goes wrong. The relevant comparison is with what actually happens when capable people are promoted without support: the exit of talented team members, the quiet drag on productivity, the employment relations cases, the reputational cost of poor management in an environment where the talent market is competitive and word travels.

The CIPD has consistently noted that management capability is a primary driver of employee wellbeing, engagement, and performance. The HSE estimates that each sickness absence day costs an employer £120 in lost profit. The IPPR's research identifies that presenteeism, working while unwell, is costing UK organisations the equivalent of 44 days of lost productivity per employee per year, up from 35 days in 2018. Those numbers are not abstract. In a professional services firm of 200 people, even a modest reduction in preventable absence and disengagement represents a material improvement in output and a measurable reduction in people cost.

Coaching a newly promoted partner or director, proactively and early, typically costs a fraction of a single employment tribunal or a settlement negotiation. It costs considerably less than the exit package for a senior person who was quietly failing and needed to be managed out. It costs less than the replacement cost of two or three talented juniors who left because their manager was overwhelmed and their experience suffered as a result.

The Professional and Human Argument

There is also a simpler argument, which tends to get lost in the numbers.

The person who has been promoted beyond their current competence is not a liability. They are usually someone who has worked hard, performed well, and deserved to be recognised. What they deserve, alongside that recognition, is the support to succeed in the new role. Leaving a capable professional to struggle silently in a job they feel ill-equipped to do is not a neutral decision. It is a decision with consequences for their health, their confidence, their relationships, and their career.

Gallup's most recent data shows that manager wellbeing declined more sharply than any other group between 2023 and 2024, with older managers and female managers experiencing the steepest drops. The demands placed on management in financial and professional services are specific and high. Time pressure, client expectations, regulatory scrutiny, internal politics, and the expectation that leaders will manage people effectively while continuing to contribute technically: these are not conditions in which people will simply muddle through without support.

Firms that invest in leadership development are not just making a commercial decision. They are making a statement about what kind of employer they are, and what kind of work they believe is acceptable to expect of the people they promote.

Where to Start

For most professional services firms, the practical starting point is straightforward.

First, establish a structured transition support model for any promotion into a line management role. This does not require a large programme or a significant budget. A defined package of coaching sessions, a 360-degree feedback process, and a peer support mechanism for new managers covers the essentials. The investment is small relative to the risk it addresses.

Second, revisit how promotion decisions are made. If your current process is primarily based on technical performance, consider what additional criteria could be incorporated. Collaborative working style, communication clarity, and evidence of developing others are observable. They can be assessed. They predict managerial performance better than billing figures.

Third, normalise coaching as a professional development tool, not a signal of difficulty. In firms where coaching is only offered when there is a problem, the stigma associated with it makes it less effective and less likely to be taken up proactively. In firms where senior leaders visibly engage with coaching and talk about it without apology, the culture shifts.

The Peter Principle is not a satirical concept from 1969. It is an active dynamic in most hierarchical organisations, and financial and professional services firms are not immune. The question is not whether it is affecting your organisation. The question is what you are doing about it.