Leadership gaps aren’t always created when someone leaves the business. Internal promotions can shift capability upwards while leaving an important role behind. Without a plan for that vacancy, organisations risk stretching existing teams and being forced into a reactive appointment later.
Promotions can sometimes have unanticipated negative outcomes that cascade down through the organisation, especially if you don’t have a deliberate plan to fill the vacancy left behind. CIPD’s 2024 Resource and Talent Planning report shows that more organisations are turning to their internal workforce to meet their talent requirements as competition for leadership talent increases.
While this move can be positive, it often creates new gaps elsewhere in the organisation. The promotion triggers a chain reaction of transitions, other promotions, vacancies, and structural adjustments by reshaping responsibilities and introducing new demands on the existing team.
With the wider organisational movement, multiple roles may become open simultaneously, often across different functions and levels. If you treat the previous role as a secondary concern and promote without a backfill plan, you turn a positive leadership move into operational risk. A few months later, you may find yourself recruiting reactively, often under time pressure and with fewer good options, leading to rushed decisions, poor-fit hires and long-term disruptions.
How Internal Promotions Can Create a Domino Effect in Your Organisation
The Domino Effect occurs when promoting a strong performer solves one leadership requirement but creates another. Without a clear successor for the role they vacate, that vacancy can quickly become a wider capability gap.
The internal promotion can solve one leadership need while creating another further down the organisation.
When you move an executive into a larger role, someone still needs to own their previous responsibilities. If you don’t plan for the vacancy, the work often spreads across the existing team. A senior manager takes on extra responsibilities, another employee starts covering operational decisions, and the newly promoted executive can still remain involved in their former role.
The domino effect can move further when one of those employees is promoted to fill the next vacancy. You may solve the second gap but create a third. Without a wider succession plan, one leadership appointment can trigger several recruitment needs.
This is where a promotion can become a domino effect rather than a straightforward succession decision.
Apple Inc.’s leadership transitions are a good example of a domino effect, or vacancy chain, triggered by an internal promotion. When Steve Jobs resigned as CEO in 2011, the COO, Tim Cook, who previously managed operations and the global supply chain, was promoted to replace him. To fill the gap left by Cook, Jeff Williams, who served as the VP for operations, took over and was later officially named COO. As Williams moved up, Apple split his responsibilities and backfilled them by promoting various supply chain managers and senior directors within the company.
What Happens When You Don’t Backfill the Role?
The first signs are rarely dramatic. Reporting may take longer, customer issues may need more escalation, projects may lose pace, and you may find managers attending more meetings without making more decisions. Each problem can look manageable on its own, but over time, the business begins paying for the missing role.
Your Strongest People Become Overstretched
High performers usually carry the greatest share of extra work. You trust them, so you give them more responsibility. They may welcome the opportunity at first, especially when it offers useful experience, but the arrangement becomes damaging when temporary responsibilities have no end date.
People can start questioning whether the company recognises their contribution. Some may expect promotion while others conclude that they’re covering a vacancy the business has no intention of filling. Your internal promotion can cause another strong employee to leave.
Performance Slips Quietly
Leadership gaps often show up as slower delivery rather than immediate failure. Targets are missed by small margins, decisions move into the next meeting, teams receive less coaching, or problems remain unresolved for longer.
The business may blame market pressure or workload without connecting the decline to the missing leader. By the time the link becomes clear, you’re no longer planning a backfill but recruiting to repair performance.
Recruitment Becomes Reactive
A vacancy left open for six months becomes harder to fill calmly. The acting leader may be exhausted, the promoted executive needs to focus fully on their new role and the board wants a quick answer.
You enter the market with an urgent timetable. Data from CIPD’s Spring 2026 Labour Market Outlook shows that despite low vacancy levels, 33% of employers still report hard-to-fill roles as they seek talent that isn’t available. Cost management remains the leading priority for 58% of employers, which means many organisations are trying to protect capability without increasing spending too quickly.
Delaying the backfill may reduce costs for a few months, but it can leave you competing for talent after operational costs have already grown.
How to Promote Without Creating a Leadership Vacuum
A promotion should trigger a wider succession review where you don’t just ask whether someone is ready for the senior role but what happens across the organisation once they move.
Map the Full Vacancy Chain
Start with the person being promoted and work down through the structure. Who takes over their current responsibilities? Which parts of the role need specialist experience? Could an internal move create another vacancy elsewhere?
This may reveal two or three connected appointments. You don’t need to fill every role externally, but you must have a named plan for each critical responsibility.
Decide What the Old Role Needs Now
Avoid copying the promoted leader’s previous job description. They may have shaped the role around their personal strengths, but the team, systems and business plan may have changed since they first took the position.
Ask what the role needs to deliver over the next two years. You may decide to split the responsibilities, appoint someone with different experience or move part of the work into another function. A promotion gives you an opportunity to improve the structure instead of simply preserving it.
Assess Internal Successors Before Announcing the Move
An acting appointment shouldn’t be your first assessment of someone’s readiness.
Give potential successors broader responsibilities earlier. Letting them lead major projects, manage budgets, or work with the board gives you better evidence of their ability to step up. They will also gain a clearer view of the role before accepting it.
Bring in External or Interim Support Early
Some gaps won’t have a ready internal successor. An interim leader can protect performance during the handover, and an executive search can test the external market before the team becomes overstretched. Early action gives you time to find the right person instead of the fastest available person.
When performance has already started declining, boards may need to replace a senior leader before the gap spreads further. A wider succession process can support a CEO appointment suited to your next business phase and protect the roles affected beneath it.
Proactive Backfilling Protects Your Internal Promotion
A strong promotion should free the executive to step into their new role and avoid spending the next year covering their previous team, answering old questions, and approving decisions someone else should own.
Early backfilling gives the new leader space to succeed and protects the team they have left behind. People understand who holds authority, what the reporting structure means and where future opportunities may sit. It gives your business better continuity rather than progress at one level and disruption at another.
Novo’s Perspective
Internal promotion can retain experience, strengthen engagement and give your organisation a leader who already understands the business, but you must avoid the mistake of viewing the appointment in isolation.
Every promotion moves capability from one part of the organisation to another. Without a backfill plan, the pressure lands on the remaining team and often stays there longer than expected. Strong boards follow the vacancy chain before making the appointment, assessing internal successors, redefining roles where needed, and searching externally before performance starts to suffer.
At Novo Executive, we believe that organisations should plan leadership transitions across the wider structure, not only the most visible vacancy. This gives your promoted leader room to succeed and protects the capability they leave behind.
