---
title: "Your Best Performer Might Be Your Most Expensive Hire"
description: "A toxic culture predicts attrition 10 times more strongly than pay. How to spot a brilliant jerk, and how to score the how as well as the what."
url: "https://sageo.ai/blog/competency-and-culture/cost-of-toxic-high-performers"
updated: "2026-10-05T00:00:00.000Z"
author: "Deepti Gupta"
section: "Competency and Culture"
image: "https://sageo.ai/blog/covers/cost-of-toxic-high-performers.png"
source: "Sageo (sageo.ai)"
---


# Your Best Performer Might Be Your Most Expensive Hire

_A toxic culture predicts attrition 10 times more strongly than pay. How to spot a brilliant jerk, and how to score the how as well as the what._

By Deepti Gupta.

## About This Series

This is the second post in our seven-part Competency and Culture series. In [our first post](https://sageo.ai/blog/competency-and-culture/reviews-measure-managers), we showed that most of a performance rating reflects the person giving it, not the person receiving it. This post is about what happens when ratings only measure one thing: results. When the only score that counts is *what* someone delivered, a person can hit every target while quietly damaging the team around them, and the system will reward them for it. Get this right, and the posts that follow, on turning values into behaviour and hiring beyond "culture fit," have something solid to stand on.

Most high performers are exactly what they look like: people who deliver and lift the people around them. This post is not about them. It is about the exception, the person whose results are real but whose behaviour costs the team more than their output is worth.

The exception is not rare. The chance of hiring or promoting one at some point is high, and higher than most founders expect, for a simple reason: results are easy to see and behaviour is not. A strong candidate who is sharp with junior colleagues looks, on paper, exactly like a strong candidate who is not. And once they are delivering, the numbers make a very persuasive case for looking away.

It is also worth saying plainly: you will not always find someone who is both a technical superstar and a culture champion. Most hires come with trade-offs. Some are brilliant and still learning to work with others. Some are wonderful colleagues who are still growing into the role. That is normal. The goal is not to hire only perfect people. It is to see the trade-off clearly, decide which behaviours are non-negotiable, and act before the cost lands on your team.

When that does not happen, you pay what we call the brilliant jerk tax: in resignations, in slower decisions, and in people who never join because they heard what it is like to work there. Because it never appears as a line item, companies tend to pay it for far longer than they should.

## Why do founders protect the people who hurt their teams?

Because results are visible and damage is not. A missed target is a number on a slide. A team that has stopped trusting its leader is a feeling in a room, and feelings are easy to argue with. When a founder has to choose between a hard number and a soft signal, the number usually wins.

We have lived this.

> **From our experience**
>
> At a growth-stage company of about 400 people one of us worked in, we hired a senior leader who delivered from the first quarter. Projects shipped on time and targets were hit. This leader was also sharp with their team, dismissive of peers, and quick to take credit in leadership meetings. None of that showed up on a dashboard.
> The CXO knew and kept them anyway. The reason was simple: the results were coming in. For about nine months nobody could argue with the numbers.
> The HR business partner changed the conversation. They reported that the team was at its lowest point on morale and motivation, and that people were avoiding the office. We ran a short pulse survey. Engagement on the team sat well below the company average, and several people were already looking elsewhere. The results went to the CXO unedited. Within weeks, we parted ways with the leader.

The lesson was not that we hired badly. The leader was capable, and the results were real. The lesson was that we had [no way to score *how* this leader delivered](https://sageo.ai/guides/best-performance-review-software), so the only number anyone looked at was *what* they delivered. The CXO was not ignoring the problem. The CXO had no data about the problem until someone went and collected it.

That is the pattern we see most often. Founders who keep a toxic high performer rarely approve of the behaviour. They keep them because the system only shows them one side of the ledger.

> **What this looks like in practice**
>
> if the only evidence against a high performer is "people have been complaining," you will keep them. If you have a pulse survey, skip-level notes, and two regretted exits from their team, you will not. Collect the second kind of evidence before you need it.

## How do you tell a brilliant jerk from someone who is simply demanding?

This distinction matters, because getting it wrong in either direction is costly. Label every demanding high performer a jerk and you will lose the people who hold your standards up. Excuse every jerk as "just demanding" and you will lose everyone else.

The difference is not how high the bar is. It is what happens to the people around it.

| Demanding, and good for the team | Brilliant jerk |
| --- | --- |
| Challenges the work, not the person | Makes it personal: belittles, mocks, or embarrasses |
| Holds everyone to the same standard, including themselves and their seniors | "Kisses up and kicks down": charming with leaders, harsh with juniors |
| Shares credit, and takes the blame when their team misses | Takes credit for wins, and names someone else for misses |
| People seek them out for feedback, even when it is tough | People avoid them, and route work around them |
| Their team gets stronger and stays | Their team goes quiet, and strong people leave or transfer |
| Hard conversations happen in the room | Hard conversations happen in private messages, exit interviews, or not at all |

The single most reliable test in that table is the second row. Ask how this person treats people who cannot help their career: juniors, support teams, interview coordinators, new joiners. Behaviour towards the powerful is managed. Behaviour towards everyone else is real.

## How do you spot a brilliant jerk before and after you hire them?

**Before you hire.** Interviews are designed to test skill, so they miss behaviour unless you look for it on purpose. Five checks catch most of the risk:

1. **Listen for "I" and "we."** Ask about their biggest win. Strong collaborators describe the team and their part in it. Candidates who only ever say "I," or who describe former colleagues as the obstacle, are telling you something.
2. **Ask about disagreement.** "Tell us about a time a peer strongly disagreed with you. What happened next?" Listen for whether the other person comes out of the story with any credit.
3. **Watch the whole process, not just the interview.** How did they treat the coordinator who scheduled the call, or the junior engineer on the panel? Ask them.
4. **Take references from sideways and below.** Most reference checks go to former managers, the one group a "kiss up, kick down" person has always impressed. Ask to speak to a former peer and a former direct report.
5. **Score behaviour separately.** Give interviewers a written behaviour score alongside the skill score, so "brilliant but a bit abrasive" becomes a data point rather than a shrug. We covered structured, role-specific scorecards in [The Best Hire You'll Ever Make Is Not on Any Job Board](https://sageo.ai/blog/talent-density/how-to-hire-exceptional-talent).

**After you hire.** Some behaviour only shows up under pressure, so keep watching. These signals rarely lie:

| Signal | What to look for |
| --- | --- |
| Pulse survey gap | One team's scores sit well below the company average, especially on respect, safety to speak up, or intent to stay |
| Skip-level silence | Team members give short, careful answers in skip-level conversations, or ask to talk "off the record" |
| Regretted exits | Strong performers leave the same team within a few months of each other, or ask for internal transfers |
| Routing around | Peers stop bringing work to this person and find other paths, even when it is slower |
| Meeting behaviour | Others stop disagreeing when this person is in the room |

One signal can be noise. Two or three pointing at the same person is a pattern. Silence in meetings is often the earliest sign; we looked at why teams go quiet, and what it costs, in [The Best Teams Are Not Fearless. They Are Safe to Fail and Driven to Win](https://sageo.ai/blog/talent-density/psychological-safety-high-performance).

> **What this looks like in practice**
>
> add one question to every reference check: "How did this person treat people more junior than them?" Ask it of a peer or a former report, not only a former manager.

## What does a toxic culture actually cost?

More than pay, and by a wide margin.

In 2022, [MIT Sloan Management Review published research by Donald Sull, Charles Sull, and Ben Zweig](https://sloanreview.mit.edu/article/toxic-culture-is-driving-the-great-resignation/) that analysed 34 million employee profiles and more than 1.4 million Glassdoor reviews from April to September 2021, the peak of the Great Resignation. They wanted to know what predicted which companies lost people fastest.

The answer was not compensation. A toxic corporate culture was **10.4 times more powerful than compensation** in predicting a company's attrition rate. Among the elements that made a culture toxic, employees feeling disrespected sat near the top.

| Predictor of attrition | Relative strength |
| --- | --- |
| Toxic corporate culture | 10.4 times stronger than compensation |
| Compensation | Baseline |

_Source: [Sull, Sull and Zweig, MIT Sloan Management Review, 2022](https://sloanreview.mit.edu/article/toxic-culture-is-driving-the-great-resignation/)._

That finding changes the maths on a toxic high performer. A founder weighing "their results" against "their behaviour" is usually comparing one person's output with a vague sense of team unhappiness. The research says the second number can be the bigger one. One person can create the conditions that drive out several.

The cost is also wider than the team. [Gallup's 2026 State of the Global Workplace report](https://www.gallup.com/workplace/349484/state-of-the-global-workplace.aspx) found that only 20% of employees worldwide were engaged in 2025, and estimated that low engagement cost the global economy about $10 trillion, roughly 9% of global GDP. A leader who damages engagement is spending company money, whether or not it shows up on a budget. (We first looked at the hidden cost of people who are "fine but not great," including the gifted but toxic type, in [Mediocrity Doesn't Show Up on Your Balance Sheet](https://sageo.ai/blog/talent-density/cost-of-mediocrity).)

There is one older study still worth knowing, because it is the only one that puts a dollar figure on a single hire. [Researchers Michael Housman and Dylan Minor at Harvard Business School](https://www.library.hbs.edu/working-knowledge/hazard-warning-the-unacceptable-cost-of-toxic-workers) studied nearly 60,000 workers across 11 firms. They found that avoiding one toxic worker saved about $12,489, nearly double the $5,303 gained from hiring a top-1% superstar. They also found that toxic workers were often *more* productive than average, which is exactly why they get hired and kept.

> **What this looks like in practice**
>
> when you next calculate what a high performer is worth, add a second column. Count the resignations, internal transfers, and declined offers from their team in the last 12 months. That column is the price of keeping them.

## Why do "toxic rock stars" survive so long?

In April 2022, Deepa Purushothaman and Lisen Stromberg wrote in [Harvard Business Review](https://hbr.org/2022/04/leaders-stop-rewarding-toxic-rock-stars) about what they called "toxic rock stars": high performers who bully and belittle, and who escape consequences because of their results. Their argument was blunt. Leaders keep rewarding these people, and the cost lands on everyone else, most heavily on the people who already have the least power in the room and are most likely to leave quietly.

In our experience, these people survive for four reasons, and none of them is that the founder approves.

| Why they survive | What is really happening |
| --- | --- |
| They manage up well | Leadership sees confidence and delivery. The team sees something else, and the team does not write the reviews |
| They look irreplaceable | Clients, knowledge, or a key system sit with them. Nobody has tested whether that is true |
| The complaints come from below | Concerns arrive from junior people, one at a time, without evidence. Each one is easy to dismiss |
| The review only scores results | There is no formal place to record *how* they work, so the behaviour never becomes a data point |

The last one is the one founders can fix fastest. The first three are human nature. The fourth is a design choice.

> **What this looks like in practice**
>
> ask each of your leaders one question: "If this person left tomorrow, what would break, and for how long?" If the honest answer is "a few weeks," they are not irreplaceable. You have just never tested it.

## How do you score the *what* and the *how* separately?

The fix is to stop giving people one score. Give them two: one for outcomes (what they delivered against goals) and one for behaviour (how they delivered it, measured against your values described as observable actions). Then put the two scores on a simple grid.

|  | Strong behaviour | Weak behaviour |
| --- | --- | --- |
| **Strong outcomes** | **Exemplar.** Promote, reward, and use as a role model | **Toxic producer.** The highest-risk quadrant. Clear behaviour plan with a short deadline; exit if it does not change |
| **Weak outcomes** | **Developing anchor.** Strong culture carrier. Coach on skills, check role fit, or redeploy | **Mismatch.** Neither is working. Move quickly and respectfully to an exit |

Notice that most people are not in the top-left box, and that is fine. A developing anchor is a valuable person who needs skill-building. A strong performer with a rough edge may simply need clear, specific feedback for the first time. The grid is not there to sort people into heroes and villains. It is there to make the trade-off visible, so it is a decision rather than a drift.

This grid is not new. A version of it was popularised decades ago as the performance-values matrix. What makes it work is not the grid. It is two things founders usually skip.

First, **decide the rules before you see the names.** Agree in advance that a weak behaviour score blocks promotion and equity, whatever the outcome score. If you decide the rule while looking at your top salesperson, you will make an exception.

Second, **make the behaviour score as concrete as the outcome score.** "Not a team player" is an opinion. "Took credit for a peer's analysis in two leadership reviews this quarter" is evidence. [Our third post in this series](https://sageo.ai/blog/competency-and-culture/values-fail-in-the-review) covers how to turn values into behaviours like these, at every level.

> **What this looks like in practice**
>
> in your next review cycle, add a second score for behaviour, even if it is rough. Plot your leaders on the grid. Treat any name in the top-right box as your first conversation, not your first exit.

## What do you do once you see it?

Start with a conversation, not a verdict. Many high performers with a rough edge have simply never been told that the behaviour matters, because nobody ever scored it. A direct, specific conversation, with two or three concrete examples and a clear timeframe, is often enough to change it.

What matters is what happens next. If the behaviour changes, you have kept a strong performer and made them better. If it does not, the decision is already made, and waiting only raises the price. In our story, it took a pulse survey to make that visible. The earlier you look, the cheaper the answer.

> **What this looks like in practice**
>
> run a short pulse survey every quarter, and break the results down by team. Not to rank managers, but so that no team can be at its lowest point for nine months without anyone knowing.

## How does this connect to the rest of the series?

The brilliant jerk tax is what happens when a company measures only half of performance.

It connects back to [our first post, on rating reliability](https://sageo.ai/blog/competency-and-culture/reviews-measure-managers). A behaviour score is only useful if it means the same thing in every team. Otherwise a strict manager marks down a good colleague, and a distant manager misses a toxic one. Two scores need twice the calibration, not half.

It connects forward to values. You cannot score *how* someone works until you have described what good looks like at their level. In [our next post](https://sageo.ai/blog/competency-and-culture/values-fail-in-the-review), we look at why most company values change nothing, and how to turn them into behaviours a manager can actually observe and rate.

And it connects to hiring. In our experience, many toxic producers were flagged in interviews as "strong but a bit abrasive" and hired anyway, because the interview only tested for skill. [Our fourth post](https://sageo.ai/blog/competency-and-culture/culture-fit-vs-culture-add) looks at how hiring for "fit" goes wrong, and what to test for instead.

The reframe underneath all of it is simple. Results tell you what someone delivered. They do not tell you what it cost. Every founder already tracks the first number. The companies that keep their best people are the ones that track the second.

## Frequently asked questions

### Do toxic high performers cost more than they earn?

Usually yes. Harvard research by Housman and Minor across nearly 60,000 workers found that avoiding one toxic worker saved about $12,489, nearly double the $5,303 gained from hiring a top-1% superstar. The output a toxic star produces rarely covers the attrition and disengagement they leave behind.

### How do you tell a brilliant jerk from someone who is just demanding?

A demanding colleague raises the standard for the work; a brilliant jerk raises the cost of being near them. The test is what happens to the people around them: high standards make a team better, while toxicity makes good people quieter, more cautious, or gone.

### Why do toxic rock stars survive so long?

Because their individual output is visible and their damage is not. Housman and Minor found toxic workers were often more productive than average, which is exactly why they get hired and protected, while the disengagement and turnover they cause never lands on any one budget line.