The Confidence Gap: What Happens Between Accepting the Offer and Day 100

Why the first 100 days of a leadership transition are when self-doubt peaks, and what smart companies are doing about it.

The phone call came on a Thursday afternoon. The board had made their decision. She was the new Chief Commercial Officer of a $2 billion industrial services company. Base salary: $450,000. Equity package that could be worth millions. An office overlooking the harbour. She said yes before they'd finished outlining the benefits pack

age.

That night, over champagne with her husband, she felt what every newly minted executive feels in that moment: invincible. LinkedIn exploded with congratulations. Former colleagues reached out. Her mother cried happy tears on FaceTime.

By Sunday night, a different feeling crept in. A quiet voice, barely audible at first: "What have I done?"

She wasn't incompetent. Far from it. She'd crushed every sales target for a decade. Built client relationships that competitors couldn't crack. Had instincts about markets that bordered on psychic. But leading a commercial organisation of 300 people across three continents? That was something else entirely. And nobody—not the headhunter, not the board, not the outgoing CCO during the handover—had mentioned that she'd need to know how to actually lead people.

What she didn't know, couldn't know, was that she'd just entered the most predictable psychological crisis in modern business. And that 71% of the people already sitting in similar offices were going through exactly the same thing.

The Thing Nobody Talks About

There's a remarkable uniformity to how companies onboard senior executives. They've got it down to a science. Week one: systems training. Week two: stakeholder meetings. Week three: strategy deep-dives. By day 30, the new executive has reviewed hundreds of PowerPoint slides, shaken hundreds of hands, and can navigate the org chart like a subway map.

What they haven't received is a single conversation about the thing that's actually happening to them.

A recent 2024 study surveyed 10,000 employees. When researchers got to the CEO data, they found something startling: 71% reported symptoms of impostor syndrome. Not 71% had experienced it at some point in their career. Seventy-one per cent had it right now, whilst sitting in the top job.

The researchers expected to find impostor syndrome in junior employees, the 25-year-olds still figuring things out. Instead, they found the opposite pattern. Senior management, CEOs at 71%, other executives at 65% were more likely to feel like frauds than early-stage professionals at 33%.

Think about that for a moment. The people running the largest organisations, making decisions that affect thousands of lives, are walking around convinced they've somehow tricked everyone into thinking they're qualified.

And nobody talks about it.

Not in the onboarding materials. Not in the executive coaching sessions. Not in the handover meetings. The previous CCO doesn't mention that she spent her first three months waking up at 3 AM convinced she was about to be exposed. The board doesn't disclose that half of them felt exactly the same way when they got their first big jobs. The whole system operates on a collective delusion: that leadership competence is something you either have or you don't, and if you've made it to the C-suite, you must have it.

But here's what actually happens in those first 100 days.

The Timeline Nobody Prepared You For

Days 1-30: Everything is fine (until it isn't)

Our new CCO (let's call her Sarah) spent her first month doing exactly what she was supposed to do. She met with every direct report. She reviewed the strategic plan. She learned the product portfolio. She impressed people with how quickly she grasped the complexity.

Week three, someone asked her opinion in a leadership team meeting. The CFO and COO were locked in a debate about resource allocation for the Australian expansion. Both had compelling arguments. Both had data. Both were looking at her, waiting.

She had no idea what the right answer was.

She'd never made a decision like this. Sure, she'd advised on plenty of commercial decisions. But advising is different from deciding. When you advise, someone else carries the weight. When you decide, it's all yours. And she had maybe 40% of the information she'd want to make this call with confidence.

So she did what every new executive does in that moment: she made her best guess and said it with authority.

That night, she lay awake wondering if she'd just made a catastrophic mistake.

Days 31-60: The cracks widen

By week six, Sarah had a new problem. One of her direct reports—a senior sales director who'd been with the company for 15 years—wasn't performing. The numbers were clear. His team was missing targets. Clients were complaining. Something needed to happen.

She'd never fired anyone above middle management. She'd never had a conversation with someone who'd been doing this job since before she'd made her first sale. The playbook in her head, built on a decade of sales excellence, had nothing for this.

She did what 60% of executives do, according to research by Melody Wilding: she felt impostor syndrome negatively impact her ability to lead confidently. She delayed the conversation. She over-prepared. She role-played it with her husband. She read three books on difficult conversations. And when she finally sat down with the sales director, she could hear the shakiness in her own voice.

He heard it too.

Days 61-100: The fork in the road

By day 80, Sarah had made a crucial discovery: she wasn't alone.

She'd joined a peer group of other new executives. And in that group, with people who weren't her employees or her boss or her board, she said the thing she couldn't say anywhere else: "I have no idea if I'm doing this right."

The response wasn't what she expected. It wasn't pity or shock. It was relief. Every single person in that room felt the same way. The new CFO at a tech company. The new COO at a hospital. The new CEO of a manufacturing firm. All of them, every day, waking up wondering if today was the day someone would figure out they'd made a terrible mistake.

But here's where their stories diverged.

Some of them, the ones who'd internalised the belief that they should already know all this, were spiralling. Second-guessing every decision. Micromanaging their teams. Burning out under the weight of trying to project a confidence they didn't feel.

Others—and Sarah was becoming one of them—were doing something different. They were treating this as a learning problem, not an identity problem. They were reframing "I don't know how to do this" from "I'm a fraud" to "I don't know how to do this yet."

The difference between those two sentences is everything.

The Science of Self-Doubt

When psychologists study self-doubt in leaders, they find something surprising: it's not always destructive.

Basima Tewfik at MIT did research that's about to be published in the Academy of Management Annals. She found that leaders experiencing impostor thoughts often performed better at interpersonal tasks. The mechanism was fascinating: worried that people might question their competence, they overcompensated by being more attentive, more collaborative, more humble.

Those aren't terrible qualities in a leader.

The problem isn't the self-doubt itself. It's what happens when you process it in isolation.

Another study, this one by Jennifer Guerrettaz and Robert Arkin, found that self-doubt only damaged performance when people believed their abilities were fixed. Leaders with what psychologists call a "growth mindset", the belief that abilities are malleable, that you can learn and develop, showed no negative effects from self-doubt at all.

They saw it differently. Not as evidence they were frauds, but as evidence they were learning.

But, and this is crucial, adopting a growth mindset in the abstract is easy. Maintaining it when you're 60 days into a new role, making decisions that affect hundreds of people, with a board breathing down your neck? That's a different thing entirely.

The Missing Infrastructure

Here's what's strange about all this: the problem is entirely predictable. The timeline is consistent. The emotional arc is universal. Companies know this is happening. They've seen it happen to every executive they've hired. And yet, systematically, they do nothing about it.

They'll spend $100,000 on a headhunter. Another $30,000 on relocation. Maybe $10,000 on onboarding materials. But the thing that would actually help: a structured way to process the psychological transition, to learn leadership in real-time whilst doing the job, that costs maybe $20,000 and nobody buys it.

Why?

Because admitting you need it feels like admitting you're not qualified. The new executive doesn't want to ask for it. That would signal weakness. The company doesn't want to offer it. That would suggest they hired someone who isn't ready or perhaps even the wrong person entirely. So everyone pretends the problem doesn't exist.

Meanwhile, research from South Africa by L. Da Fonseca found that leaders with low self-awareness—the ones who don't recognise their own patterns and triggers—exhibited behaviours consistent with "tyrannical leadership." They got results, but at the expense of their people. They micromanaged. They undermined motivation. They created toxic cultures.

The cost of all this? Failed executive transitions run into the millions. Recruiting fees. Lost productivity. Organisational disruption. Even the "successful" transitions often leave performance on the table. Leaders who survive but don't thrive.

And here's the kicker: it's all preventable.

What Actually Works

Sarah, our CCO, got lucky. Her company, without quite knowing why, had built something into their executive onboarding that most don't: a thinking partner outside the organisation.

Not a mentor. Not someone who'd known her for years. Someone whose only job was to help her make sense of what she was experiencing, in real-time, without political implications.

Every two weeks, she'd sit down with this person and talk through what was actually happening. Not the sanitised version she'd tell her boss. Not the confident version she'd project to her team. The real version.

"I have no idea if I handled that conversation correctly."

"I'm worried I'm micromanaging my team."

"I can't tell if my COO thinks I'm incompetent."

And instead of reassurance or advice, she got something more valuable: frameworks. The foundational leadership concepts that business schools teach but that most executives never systematically learn. Daniel Goleman's work on emotional intelligence. John Kotter's frameworks for leading change. Peter Drucker's insights on self-management.

Not delivered as theory in a classroom. Delivered just-in-time, applied to the actual situations she was facing.

By day 100, Sarah had made a crucial shift. She still felt doubt. But she'd stopped interpreting it as evidence she was a fraud. She'd started interpreting it as information. "I'm feeling uncertain about this decision" became "What don't I know yet? Who should I talk to? What framework might help me think through this?"

The compound effect of those small reframes, over 100 days, was dramatic.

The Opportunity

We're at a strange moment in business. Everyone knows this problem exists. The research is public. The statistics are staggering. And yet, institutionally, we do almost nothing about it.

Companies will spend millions on leadership development programmes for mid-level managers. They'll send people to the most expensive business schools for executive education. But the moment when leaders are most vulnerable. The first 100 days of a transition, they're mostly on their own.

What if we treated those first 6-12 months differently? Not as a sink-or-swim test of inherent capability, but as a distinct developmental moment requiring specialised support?

Not remedial coaching for struggling leaders. Not long-term development that stretches over years. But proactive partnership during the highest-stakes window, when leaders are most open to growth and most in need of help.

The infrastructure would be simple:

Before day one, a conversation about what's actually about to happen. Not just the business transition, but the psychological one.

Months 1-3, regular processing of real challenges as they emerge. Just-in-time frameworks. Help distinguishing productive doubt from destructive doubt.

Months 4-6, consolidating learning, making conscious choices about leadership style, building sustainable practices.

The return on investment would be measurable: faster time to productivity, stronger relationships, better decisions, higher retention.

But more than that, you'd get leaders who are self-aware, adaptable, and human. Who value growth over pretence. Who build trust not by pretending to have all the answers, but by being trustworthy in how they find them.

The Bottom Line

Sarah's one year into the job now. She still feels doubt. The difference is, she's stopped being afraid of it.

Last month, in a board meeting, the CEO asked her opinion on a major strategic decision. She had maybe 60% of the information she'd want. But this time, instead of pretending she had it all figured out, she said: "Here's what I know. Here's what I don't know yet. Here's how I'd go about finding out. And here's my preliminary thinking, but I want to test it with the team before I'm fully confident in the recommendation."

The CEO nodded. "That's exactly the kind of thinking we need."

Turns out, nobody expected her to have all the answers. They just expected her to know how to find them.

The confidence gap is real. It's universal. Seventy-one per cent of C-Suite leaders are experiencing it right now. The question isn't whether new leaders will feel doubt in their first 100 days.

The question is: Are we finally going to start supporting them through it?

Vantyr Group partners with executives during their first 6-12 months in new leadership roles—the critical window when transitions succeed or struggle. We provide the confidential thinking partnership and real-time support that transform the confidence gap from a crisis into a catalyst for growth.

References

Da Fonseca, L. (2020). The influence of self-awareness on effective leadership outcomes in South Africa. South African Journal of Business Management, 51(1). https://sajbm.org/index.php/sajbm/article/view/2720/2279

Drucker, P. F. (1999). Managing oneself. Harvard Business Review, 77(2), 64-74.

Goleman, D. (1998). What makes a leader? Harvard Business Review, 76(6), 93-102.

Guerrettaz, J., & Arkin, R. M. (2019). Self-doubt effects depend on beliefs about ability: Experimental evidence. The Journal of General Psychology, 146(3), 261-285. https://doi.org/10.1080/00221309.2019.1585320

Hermann, A. D., Leonardelli, G. J., & Arkin, R. M. (2002). Self-doubt and self-esteem: A threat from within. Personality and Social Psychology Bulletin, 28(3), 395-408.

Korn Ferry. (2024). Workforce 2024 Global Insights Report. https://www.kornferry.com/about-us/press/71percent-of-us-ceos-experience-imposter-syndrome-new-korn-ferry-research-finds

Kotter, J. P. (1995). Leading change: Why transformation efforts fail. Harvard Business Review, 73(2), 59-67.

Tewfik, B. A., Huang, K., & Gino, F. (forthcoming). Workplace impostor thoughts, impostor feelings, and impostorism: An integrative, multidisciplinary review of research on the impostor phenomenon. Academy of Management Annals. As cited in MIT Sloan, https://mitsloan.mit.edu/ideas-made-to-matter/new-research-debunks-4-myths-about-impostor-syndrome

Wilding, M. (2014). 5 fundamental things leaders can do to combat imposter syndrome. As cited in research summary. https://melodywilding.com/5-fundamental-things-leaders-can-do-to-combat-imposter-syndrome/