Promoted, Not Prepared: Why New Managers Fail in Their First Year

My friend Pablo invited my wife Yami and me to Costa Rica to spend several days training local leaders and team members. While training was central to our mission, years of experience have taught me a critical lesson: training alone isn't enough—it must be complemented by coaching. Whether your team operates in Costa Rica or the United States, training is only one side of the leadership development equation.

To drive maximum results, a hybrid approach combining simultaneous training and coaching is the single best strategy for you and your team. It’s a powerful reminder of why so many managers today get promoted without being truly prepared to lead.

Think about the last person you promoted into their first leadership role. Chances are, you promoted them because they were excellent at their job — a top performer, someone you trusted, someone who'd earned it. And chances are just as good that you handed them a new title, a team, and maybe a half-day workshop, and then quietly hoped the rest would sort itself out.

It usually doesn't. And it's not because you picked the wrong person. It's because being good at a job and being good at leading people who do that job are two entirely different skill sets — and most organizations never bother to teach the second one.

This is the first in a series I'm writing about the people-problems that quietly cost businesses the most, and how coaching — real, structured, ongoing coaching — is the bridge most organizations are missing. We're starting here because it's foundational: if your leadership pipeline is broken at the first rung, everything built on top of it inherits the crack.

The "Accidental Manager" Problem

There's a term researchers use for this pattern: the "accidental manager" — someone promoted for technical competence who lands in a leadership role without the skills to actually lead. It's the default mode of management in most organizations, not the exception.

The numbers are stark. The Center for Creative Leadership found that 60% of new managers report never receiving any training when they stepped into their first leadership role. Gartner's research reaches nearly the same conclusion from a different angle: 60% of new managers fail within their first 24 months, largely because nobody taught them how to lead. In the UK, the Chartered Management Institute puts the untrained figure even higher, at 82%. Different studies, different years, different countries — the pattern doesn't move.

This isn't a new problem, either. It's one of the oldest leadership stories on record. In Exodus 18, Moses is single-handedly judging every dispute for an entire nation, from morning until evening, exhausting himself and everyone waiting in line.

His father-in-law Jethro watches this for a day and delivers a warning that could be pulled straight from a modern burnout report: "What you are doing is not good... you and the people with you will certainly wear yourselves out" (Exodus 18:17-18, ESV). Jethro's fix wasn't to tell Moses to work harder. It was structural — select capable people, and place them over smaller, manageable groups so leadership could actually scale.

That's exactly the gap in most organizations today. Leadership capacity isn't being built structurally. It's being assumed.

The Real Cost Isn't Just Turnover — It's Everyone Underneath the Manager

Here's what makes this expensive rather than just unfortunate: Gallup's research on the American workplace has found that managers account for roughly 70% of the variance in their team's engagement scores. Not strategy. Not compensation. Not perks. The manager, and specifically the quality of their day-to-day conversations with their people.

And yet only 48% of managers strongly agree that they currently have the skills to be exceptional at their job, according to Gallup's own data. Meanwhile, a 2020 SHRM survey found that 84% of workers say poorly trained managers create unnecessary work and unnecessary stress for their teams.

Put those together and the picture is uncomfortable but clear: most managers know they're underprepared, and their teams are the ones absorbing the cost of that gap every single day, whether or not it ever shows up on a turnover report.

This is the part leaders tend to underestimate. An unprepared manager doesn't just underperform individually — they become a multiplier, spreading their own lack of preparation across every person who reports to them.

The turnover math makes this even harder to ignore. Gallup's research on replacement costs puts the price of losing a manager or leader at roughly 200% of their annual salary — double what it costs to replace a frontline employee, and well above the 80% average for technical specialists. And managers aren't just expensive to replace; they're often the reason other people leave in the first place.

Gallup's broader research attributes more than half of voluntary turnover to manager-related reasons, and a separate survey found that 52% of employees who voluntarily left a job said their manager could have done something to prevent it. An unprepared manager, left unsupported, doesn't just risk their own failure — they put every person on their team at elevated flight risk, each one carrying that same 50-200% replacement cost if they walk.

The Proof That Coaching Fixes This: Google's Project Oxygen

If the research on the problem feels abstract, Google's internal research on its own managers is about as concrete as it gets. In 2008, Google's people analytics team set out to test a real question: do managers even matter, or are they an unnecessary layer of bureaucracy? The initial hypothesis, reportedly held by one of Google's own founders, was that they didn't matter much at all.

The data said otherwise, decisively. After analyzing more than 10,000 observations across performance reviews, feedback surveys, and manager nominations, Google's researchers found that management quality was one of the strongest predictors of team performance and retention they could identify — and that technical expertise ranked dead last among the behaviors that separated great managers from mediocre ones. What mattered most was coaching: being accessible, making time for one-on-ones, and showing genuine interest in an employee's growth and career.

Google didn't stop at identifying the behaviors — they trained managers in them, with coaching front and center. The results were measurable. Former Google HR chief Laszlo Bock reported a statistically significant improvement in manager quality for 75% of the company's worst-performing managers. One story from that data has become something of a case study in its own right: a talented but abrasive manager — described by his own team as bossy, secretive, and driving people too hard — was passed over for a promotion and told directly that his management style was the reason.

Rather than being pushed out, he was offered executive coaching. Six months later, multi-rater surveys documented real, measurable improvement in how his team experienced his leadership. A year after that, he got the promotion and the raise he'd originally been denied.

That's the pattern worth sitting with: Google didn't solve its management problem by writing better job descriptions or running better interviews. It solved it by identifying coaching as the core management skill, then building the structure to actually develop it in the managers they already had.

Training Isn't the Same as Coaching — And That Difference Is the Whole Problem

If your instinct at this point is "we do train our new managers," it's worth being specific about what kind of training. Research from Ken Blanchard Companies surveying new managers found that only 39% had received any formal leadership training, only 34% had received mentoring — and only 31% had received coaching. Coaching was the least common form of support new managers received, despite being the one most directly tied to sustained behavior change rather than one-time information transfer.

This distinction matters more than it might seem. A workshop can tell a new manager what good delegation or good feedback looks like. It can't walk alongside them the first time they have to deliver a hard message to someone who used to be their peer, or the first time a direct report pushes back on a decision. That's not a knowledge gap; it's an applied-skill gap, and applied skills are built through repeated practice with real-time input — which is precisely what coaching is designed to provide and a single seminar is not.

Scripture describes leadership development the same way — as an ongoing, relational transfer of capability, not a one-time event. Paul writes to Timothy: "What you have heard from me... entrust to faithful men, who will be able to teach others also" (2 Timothy 2:2, ESV). It's a multi-generational model of development — not "attend this training," but "walk with this person long enough that they can walk with the next one." That's coaching, not a workshop.

What Does This Mean for Your Leadership Team?

Stop treating the first 90 days as a formality. Research on new manager transitions consistently points to the first 90 days to six months as the critical window where core habits — regular one-on-ones, structured feedback, basic team awareness — either get built or don't. If a new manager doesn't develop these habits early, they tend not to develop them at all. Build coaching support into the promotion itself, starting on day one, not six months in once problems have already surfaced.

Pair every new manager with a coach, not just a course. Given how few new managers currently receive coaching (31%, per the Blanchard data) compared to how directly coaching ties to real behavior change, this is one of the highest-leverage, lowest-cost fixes available. That coach doesn't need to be external for every manager — which brings us to the next point.

Build internal coaching capacity through certified coach training. You don't have to hire an outside coach for every new manager you promote. Training a set of your existing senior leaders in ICF-aligned coaching skills lets you scale coaching support across your organization without scaling your external coaching budget at the same rate. It's the same principle Jethro gave Moses: don't do it all yourself, and don't leave capability undeveloped in the people around you — build capable people at every level who can carry part of the load.

Redefine what "promotion-ready" actually means. Google's Project Oxygen findings are a direct challenge to how most companies still promote: technical mastery ranked last among the behaviors of their best managers, and coaching ranked first. If your promotion criteria are still weighted primarily toward individual output rather than demonstrated people-development ability, you're selecting for the wrong thing at the exact moment it matters most. Build a coaching-skill assessment into your promotion process itself, not just your onboarding process after the fact.

Treat coaching as a retention strategy, not just a development perk. With managers costing roughly 200% of salary to replace, and manager-related reasons driving more than half of voluntary turnover, the math on manager coaching isn't soft — it's a direct hedge against your most expensive category of departure. A CFO who won't approve a "leadership development" line item will often approve the same investment once it's framed as turnover-cost avoidance, because the number behind it is real and it's large.

Give struggling managers a real path back, the way Google did. The instinct when a manager is struggling is often to quietly manage them out. Google's own data suggests that's frequently the wrong move — 75% of their worst-performing managers showed statistically significant improvement once they received targeted coaching. Before assuming a struggling manager is a bad hire, consider whether they're actually an under-coached one. The cost of a six-month coaching engagement is almost always lower than the 200% replacement cost of starting over.

Measure new managers on engagement, not just output. Since Gallup's research ties roughly 70% of engagement variance directly to the manager, track engagement scores for each new manager's team as seriously as you track their other KPIs. A manager who's hitting numbers while their team's engagement quietly erodes is a lagging problem, not a non-problem — and it's one coaching is specifically built to catch early.

Run structured "stay interviews" alongside coaching, not instead of it. Retention research consistently shows that regular, proactive check-ins — not just annual engagement surveys — build the trust that keeps people from quietly disengaging and eventually leaving. Equip your new managers with basic coaching-style questions for these conversations rather than a generic HR script; a manager trained to ask good questions and actually listen to the answers will surface flight risk long before HR does.

Ask new managers directly what they're unsure about — and normalize the answer. Most new managers won't volunteer that they feel out of their depth; the SHRM research on impostor-syndrome-like uncertainty among first-time managers suggests it's the norm, not the exception. A short, honest coaching check-in can surface that uncertainty months before it turns into a resignation, either theirs or their team's.

Where This Leaves You

The uncomfortable truth is that most organizations aren't failing to find good future leaders. They're failing to prepare the good people they've already promoted. The talent is usually already in the building. What's missing is the structure — the Jethro moment — that turns a good individual contributor into a manager who actually knows how to lead.

Coaching is that structure. Not a one-time event, but the ongoing, relational process that closes the gap between being promoted and actually being prepared. Google didn't need to go outside its own walls to prove this works — it looked at its own worst-performing managers, invested in coaching instead of quietly managing them out, and watched three out of four of them turn around.

That's not a soft outcome. That's a documented, statistically significant business result, sitting right next to the retention math that makes the case financially as well as culturally.

If you're an executive weighing where to spend your next development dollar, this is usually the highest-leverage place to start — not because new managers are the most senior people in your organization, but because they're the pivot point every future leader has to pass through first. Get that transition right, structurally and consistently, and you're not just solving one promotion at a time. You're building the pipeline that determines who's capable of leading your organization five and ten years from now.

What's one thing you can start doing differently to prepare your team this week for their next role?

What will it cost you not to be prepared for your next role?

Are you considering a new role in the next 6-24 months? If so, how are you preparing for this next role before your leadership gaps get exposed? Register for the free Certified Coach Accelerator Workshop, where I go deeper on the ICF certification and credentialing pathway, the coaching business roadmap, and what it looks like to build a practice, or pivot in your career, around your existing leadership experience.

Register Here: https://imaginecoachingacademy.com/live-webinar

Marcel Sanchez is the founder of Imagine Coaching Academy, an ICF Level 1 Accredited Coaching Education Provider. He is an ICF Professional Certified Coach with a mission to equip faith-based business and ministry leaders with the credential, competence, and confidence to lead at their highest level.

References

• Center for Creative Leadership and Gartner data, cited in "New Leaders Need Training," Wharton Executive Education — https://executiveeducation.wharton.upenn.edu/thought-leadership/wharton-at-work/2024/09/new-leaders-need-training/

• Chartered Management Institute data on UK managers without formal training, cited in "Why First-Time Manager Training Fails (and What to Do Instead)," Ambr AI — https://www.ambr.ai/blog/why-first-time-manager-training-fails

• Gallup, State of the American Manager research on engagement variance, cited in "Why First-Time Manager Training Fails (and What to Do Instead)," Ambr AI — https://www.ambr.ai/blog/why-first-time-manager-training-fails

• SHRM 2020 survey and Gallup manager-skills data, cited in "New Manager Training: Why Fall Is the Time," Catapult — https://letscatapult.org/blog/new-manager-training-back-to-school/

• Ken Blanchard Companies survey on new manager training, mentoring, and coaching rates, cited in "New Managers Aren't Getting The Training They Need to Succeed," Leading with Trust — https://leadingwithtrust.com/2016/10/09/infographic-new-managers-arent-getting-the-training-they-need-to-succeed/

• Google Project Oxygen findings and Laszlo Bock's 75% improvement data, cited in "What Does Google's Project Oxygen Have to Do with Coaching," College of Executive Coaching — https://www.executivecoachcollege.com/research-and-publications/what-does-google-project-oxygen-have-to-do-with-coaching.php

• Google re:Work, "Following the Data: The Research Behind Great Managers" — https://rework.withgoogle.com/intl/en/guides/following-the-data-the-research-behind-great-managers

• Gallup replacement-cost and manager-driven turnover data, cited in "The Cost of Employee Turnover in the U.S.," Wellhub — https://wellhub.com/en-us/blog/talent-acquisition-and-retention/employee-turnover-rate-for-us-companies/

• Employee survey on preventable manager-related departures, cited in "30+ Employee Turnover Costs Statistics," WifiTalents — https://wifitalents.com/employee-turnover-costs-statistics/

Scripture (ESV)

• Exodus 18:13-26

• 2 Timothy 2:2