The Executive You Should Have Replaced 18 Months Ago: 6 Signals and the Cost of Ignoring Them

I have made this mistake more than once, and it always looks the same in hindsight. A senior hire who interviewed brilliantly, who everyone liked, who was working hard — and who was, quietly, not going to get there. I knew it by month seven. I acted in month nineteen.

Nobody I have ever spoken to about a senior departure has said "I moved too quickly." Every single one has said some version of "I knew months before I did anything."

**The delay is not a character flaw. It is a predictable failure of decision-making, and like any predictable failure, it can be engineered out.** What follows is what I have learned about the signals, the arithmetic of waiting, and how to make the change without destroying the person or the company.

## First, the Numbers: This Is Not a Rare Event

If you are living through this, the odds say you are not an outlier — you are in the majority.

Research by Leadership IQ found that [46% of newly hired employees fail within 18 months, and only 19% achieve unequivocal success](https://www.preppio.com/blog/employee-onboarding-research-statistics). At the executive level the picture is no better: Harvard Business Review has cited a wash-out rate of **35% to 40% of senior outside hires within their first 18 months**, and executive search firms consistently place first-18-month executive failure in the 30–50% band ([JRG Partners](https://www.jrgpartners.com/first-year-executive-failure-rates-data-behind-onboarding-risk/)).

The cost side is equally well documented. SHRM puts the cost of replacing an employee at **50% to 200% of annual salary**, and the U.S. Department of Labor sets the floor for any bad hire at 30% of first-year earnings ([Talentfoot 2026 analysis](https://talentfoot.com/cost-leadership-mishire-2026-data/)). At the C-level, search practitioners routinely model two to three times annual compensation once severance, signing bonuses, search fees and lost productivity are added ([Centennial](https://centennialinc.com/cost-of-bad-executive-hire/)).

Notice what those figures do *not* include: the decisions that were not made, the talented people who left because of the situation, and the twelve months of strategy that quietly did not happen.

## The Six Signals

None of these is about a bad quarter. Anyone can have a bad quarter. These are the patterns that, in my experience, do not reverse on their own.

### 1. Decisions Stop Reaching You — and Also Stop Getting Made

The clearest early symptom is a decision backlog forming underneath an executive. Issues that should be resolved at their level either climb to you or simply sit.

Forbes lists the inability to make critical decisions first among the signs it is time to move a senior leader on, and I would agree — it is usually the first to appear and the easiest to rationalize away as "still ramping up."

**A senior leader who cannot decide is not slow; they are absent from the role you are paying for.** Watch for the tell: they bring you a problem with no recommendation attached, repeatedly, after month six.

### 2. Your Best People Start Routing Around Them

Organizations reveal the truth through their informal wiring. When your strongest performers begin scheduling meetings that exclude their own boss, or come to you "just to check something," the organization has already made its assessment.

This one is costly on a delay, because the routing is exhausting for the people doing it. They are effectively doing two jobs — theirs, plus the coordination their manager is not doing. Those are exactly the people you can least afford to burn out.

### 3. The Explanations Get More Sophisticated as the Results Get Worse

There is a specific tone shift that should trigger alarm. Early on, an underperforming executive says "the number missed, here is what I am changing." Later, they explain the market, the legacy systems, the previous team, the unrealistic plan.

Every one of those explanations may be individually true. That is what makes this signal so hard to read. Ask a different question: over four consecutive reviews, has the proportion of the conversation spent on *causes* grown while the proportion spent on *actions* shrank? If yes, you have your answer.

### 4. You Have Started Managing Around the Role

This is the signal I trust most, because it is about *your* behavior, not theirs.

You take the client relationship back. You sit in on the meeting you should not need to attend. You review a document that should not cross your desk. Each intervention feels like leadership. Collectively, it means you have already concluded the role is not covered, and are compensating with your own time — the scarcest asset the company has.

**If you are doing the job, you are paying twice for it.**

### 5. Values Behavior, Not Just Performance

Some of the hardest exits involve people who are hitting numbers. A leader who delivers results while corroding how the company works is a more expensive problem than an underperformer, because their success validates the behavior for everyone watching.

In a family business this signal has extra weight. What tolerance you show becomes precedent, and precedent in a company that intends to last generations is close to permanent. We founded in 1890; the standards we accept today are the standards someone inherits in 2050.

### 6. Eighteen Months In, the Function Has Not Changed Shape

A senior hire's job is not to run the function as they found it. It is to leave it structurally better — better people, better systems, better economics. At the eighteen-month mark, put the org chart, the KPI set and the cost base from their start date next to today's.

If a stranger could not tell which is which, the function has been *maintained*, not led. Maintenance is a manager's job at a manager's price.


## The Arithmetic of Waiting

Here is the calculation that finally changed my behavior. Take an executive on total compensation of 200,000 — pick your own currency and scale.

- **Twelve months of delay costs you the compensation itself.** That is the visible, small part.

- **It costs the function's progress for those twelve months.** Whatever the plan said this leader would deliver, subtract it.

- **It costs replacement time you cannot compress.** A serious executive search runs three to six months, plus a notice period, plus six months to real productivity. Delay does not pause that clock; it pushes it back one-for-one.

- **It costs the people who left.** In my experience this is the largest number and the only irreversible one.

Add it up and the delay is rarely worth less than a full year of that function's contribution. Meanwhile the thing you were protecting — the hope of a turnaround — has, by the research above, roughly a one-in-five chance of arriving.

**You are not choosing between firing and not firing. You are choosing between paying now and paying more later, with interest.**

## Why We Wait Anyway

Understanding the mechanism helps you override it.

- **Sunk cost.** The search fee, the relocation, the eighteen months of your own coaching. None of it is recoverable, and none of it should enter the decision.

- **The admission of error.** You hired this person. Replacing them is a public correction of your own judgment — which is precisely why founders and owner-CEOs wait longer than professional boards do.

- **Genuine decency.** You know their family. You know the mortgage. This is the honorable instinct and the most dangerous, because it converts a decision you owe the company into a favor you are doing one person.

- **The absence of a successor.** "I cannot let them go, there is nobody to run it." Usually false. An empty seat run by an interim is almost always less damaging than a filled seat run badly — and the vacancy creates the urgency the search needs.

## How to Do It Properly

The decision is the hard part. The execution is a craft, and it is learnable.

**Give one unambiguous warning, once.** Before any exit, the person must have heard — in plain words, not coded feedback — what has to change, by when, and what happens if it does not. Most executives who are surprised by a termination were not badly treated at the end; they were badly managed for a year.

**Then keep the conversation short.** M13's guidance on executive exits is to get straight to the point: tell them you have decided to make a change, why, and what happens next ([M13](https://www.m13.co/article/a-guide-to-letting-go-of-an-executive)). The meeting itself should last minutes. Anything longer becomes a negotiation you have no intention of honoring, which is a cruelty dressed as respect.

**Review the contract before, not after.** Notice periods, non-competes, equity vesting, garden leave, statutory obligations — these differ enormously by jurisdiction, and an exit handled loosely in Spain, the UK or the US creates very different liabilities. Employment counsel before the conversation, always.

**Be generous with terms and firm on the decision.** Severance is cheap relative to a disputed exit, and the way you treat someone on the way out is watched by everyone who is staying — and by every candidate they will ever speak to.

**Tell the team the same day, and tell them what happens next.** The vacuum after a senior departure fills with speculation within hours. Say that a change has been made, who covers what starting tomorrow, and what the search timeline is. You owe the departing person discretion about the reasons; you owe the team clarity about the future.

## Key Takeaways

- **Almost no CEO regrets acting too fast on a senior misfire; nearly all regret waiting.** Treat your own hesitation as data, not prudence.

- **The base rate is high, not exceptional.** Leadership IQ finds 46% of new hires fail within 18 months; HBR has cited 35–40% wash-out for senior outside hires.

- **The visible cost is the smallest cost.** SHRM puts replacement at 50–200% of salary; the real bill is a year of the function's progress plus the good people who leave.

- **The most reliable signal is your own behavior.** If you have started covering the role yourself, you have already made the decision.

- **Values failures are more expensive than performance failures,** because tolerating them sets a precedent the whole organization reads as policy.

- **Nobody should ever be surprised.** One clear, explicit warning with a deadline — then a short, decisive conversation.

- **An empty seat with an interim beats a filled seat run badly,** and it manufactures the urgency your search needs.

## Frequently Asked Questions

### How do I know when it's time to let an employee go?

When the gap is one of capability or values rather than clarity, and it has survived an explicit conversation with a deadline. Ask yourself the replacement test: knowing everything you know today, would you hire this person into this role again? If the answer is no and you have already given clear feedback, the decision is made — what remains is timing and execution.

### How do I fire a senior executive?

Give one unambiguous warning well beforehand, review the employment contract with counsel, and then hold a short meeting where you state the decision, the reason, and the next steps. Do not reopen the debate in the room. Be generous on terms, firm on the decision, and inform the team the same day with a clear plan for who covers what.

### What is the average cost of a bad hire?

CareerBuilder data puts the average financial loss at around $17,000 for entry- to mid-level roles and upwards of $240,000 for specialized or executive hires. SHRM estimates replacement at 50% to 200% of annual salary, and executive search firms typically model two to three times annual compensation at C-level once severance and search fees are included.

### What's the #1 reason CEOs are fired?

Boards most often cite sustained underperformance against the plan, but the pattern underneath is usually loss of confidence — a repeated gap between what the executive forecasts and what arrives. Ethical and conduct failures are less frequent but far faster acting; performance erodes trust over quarters, conduct destroys it in a day.

### Do employers ever regret firing someone?

Regret is far more common about the timing than the decision. The typical reflection is that the change should have happened months earlier, and the most frequent tell is relief instead of guilt in the days afterward. Genuine regret usually traces to poor process — no warning, an ungenerous exit, or a decision made in anger — rather than to the underlying call.

### What percentage of new hires leave within the first 18 months due to poor culture fit?

Onboarding research attributes roughly 59% of departures inside 18 months to misalignment between expectations and reality rather than raw capability. The practical lesson for hiring executives: be explicit about how decisions actually get made in your company, because that is the mismatch that surfaces later and costs the most.

## What to Do This Week

Take your leadership team, one name at a time, and answer a single question honestly for each: *knowing what I know now, would I hire this person into this role again today?* If any name gets a no, put a date in the calendar this week for the clear, explicit conversation you have been postponing. That conversation — not the exit — is the one you owe them.

To see how a group founded in 1890 builds leadership teams across eight industries and 75+ countries, meet [the people who run Manzanos Enterprises](/en/team). Then read the two pieces closest to this one: [the five signals it's time to hire your first C-level executive](/en/news/when-to-hire-first-c-level-executive-cfo-coo-signals), and [how to build a business that runs without you](/en/news/how-to-build-a-business-that-runs-without-you-founders-trap).

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