Your operations lead has resigned. Two people on the team have been watching the business grow from the inside for three years. You also have candidates from the market who’ve done something similar at a different firm and want 20 per cent more salary to join you. There’s no obvious answer, and the cost of getting it wrong won’t show until six months later. By then you’ll be managing a disengaged team, a client relationship under strain, and the prospect of starting the search over.
What’s the actual decision you’re making?
The choice is rarely as simple as internal versus external. What you’re really deciding is whether you face a vacancy or a capability gap. A vacancy means someone left but the role and what it requires are well understood; you need continuity more than new ideas. A capability gap means the role needs to deliver something your current team has never done before.
For a vacancy, the internal candidate usually has the edge. They know your clients, your systems, and the informal ways the business actually runs. For a capability gap, bringing in someone who has already done the specific thing you need is usually faster and safer than developing it from scratch inside.
The honest difficulty is that many founders mislabel the situation. A genuine capability gap gets called a vacancy because there’s someone roughly familiar with the work. A vacancy gets called a capability gap to justify a more expensive search. Getting that label right is the first call to make, and it saves everything downstream.
When does promoting internally make the most sense?
Promoting someone in-house tends to work best when there’s a credible candidate already performing at least 70 to 80 per cent of the role’s requirements, when the job depends heavily on client relationships and institutional knowledge, and when speed matters. Internal promotions typically fill roles around 40 per cent faster than external searches, cost 20 to 30 per cent less in recruitment outlay, and produce longer average tenures.
The 70 to 80 per cent threshold is worth holding to. Below it, you’re betting on potential rather than evidence. Founders who promote too early often run into what HR researchers call the Peter Principle: someone who performed well in their previous job, now in a role they weren’t equipped for. The failure damages both the business and the individual’s confidence.
There’s also a cultural signal worth considering. LinkedIn’s 2019 Workplace Learning Report found that 94 per cent of employees said they would stay longer at a company that invested in their career development. Timpson, the UK services retailer, has built its entire management pipeline on internal promotion backed by structured training. John Lewis Partnership operates on the same basis. These are not sentiment decisions; they’re retention strategies with evidence behind them.
One condition often overlooked: can you actually support the person you’re promoting? A founder who hands someone a bigger role and stays equally involved hasn’t delegated; they’ve just changed the title. Real internal promotions require reducing the promoted person’s old responsibilities and giving them room to lead without constant correction.
When does bringing in someone from outside make more sense?
External hiring earns its cost when you’re dealing with a genuine capability gap rather than a vacancy. If you’re expanding into a new service line, entering a market nobody internally has experience in, or trying to professionalise an operation that has been running on instinct and founder presence, an outside hire brings something your team cannot develop fast enough.
The clearest signal for external hiring is a role that requires experience your current team has never demonstrated. A cyber security specialism in an IT firm moving into managed detection. Compliance expertise in a financial services business engaging more deeply with the FCA. Multi-site management in a professional services firm opening a second location. These are not roles where your longest-serving team member is the right choice by default.
External hires can also make sense when promoting internally would create damaging factionalism. Where several people at similar levels are plausible contenders, elevating one can fracture a team that was functioning well. A neutral outside appointment sometimes resets dynamics that an internal decision would sharpen.
The risk to manage is culture fit. Hays and executive search research consistently identify culture misfit as the primary reason external leaders fail in their first two years. The more informal and founder-led your operation has been, the higher that risk.
What does it actually cost to get this wrong?
The cost is concrete, whichever way you get it wrong. Oxford Economics estimates that replacing a single employee costs UK firms an average of £30,614 once lost productivity and hiring outlay are factored in. External hires who leave in the first two years cost that money twice, because the role has to be filled again and the institutional knowledge gap has grown in the meantime.
For the external route gone wrong: Professor Matthew Bidwell’s Wharton research found that external hires into similar roles were paid around 18 to 20 per cent more than internal promotees, yet had 61 per cent higher exit rates and more performance issues in their first two years. That salary premium walks out the door with them.
For the internal route gone wrong: a promoted person struggling in a role they weren’t ready for affects more than that individual. Gallup’s research on management quality links poor managerial performance directly to team disengagement, with disengaged employees roughly twice as likely to leave within the year. A mis-promoted operations lead doesn’t just underperform; they pull attrition up across the team.
There’s a less visible cost too. For a founder trying to reduce their own dependency on the business, a mis-hired senior person delays the structural changes that make stepping back possible. A six to twelve month setback on a key role redesign can mean another full year stuck in the day-to-day.
What should you ask before you make the call?
Before you post the role or tap someone on the shoulder, seven questions will sharpen the decision better than any assessment process. Three of them are about the role itself, two are about your internal candidates, and two are about your capacity to manage either outcome. Working through them honestly takes an hour. Skipping them costs, on average, six months.
About the role: Is this a vacancy or a capability gap? What must it deliver in the next 12 to 36 months, specifically? Is it holding existing ground or building new ground the business doesn’t currently occupy?
About your internal candidates: Does anyone already demonstrate 70 to 80 per cent of those requirements through their actual results rather than their tenure? If you promote them, can you genuinely support them through the transition without staying equally involved yourself?
About the decision itself: What are the top three risks of each route, and which fits where the business is right now? What message does this decision send to everyone in the team who wasn’t chosen?
One question that often gets missed: have you run a fair, documented process? The Equality Act 2010 and ACAS guidance require promotion and hiring decisions to use clear, objective criteria. If you pass over an internal candidate from a protected group in favour of an external hire, an informal or undocumented decision process creates real legal exposure. Structured decision-making protects the outcome whether you go internal or external.
If you’re at the point where getting this kind of people decision right matters to whether you can step back from the business, that’s worth a conversation. Book a conversation at drdaveheath.com.
