CEO vs Interim CEO Understanding the Roles : Key Differences Explained

When a chief executive leaves, or a board decides the current one is not the right leader for the next stage, the first decision is not who to appoint. It is what kind of appointment the business needs. A permanent CEO and an interim CEO carry the same title and sit in the same chair, but they are hired for different reasons, on different terms, with different expectations about what success looks like. Boards that blur the two tend to make one of two mistakes: rushing a permanent hire under pressure, or leaving an interim in post so long that the business drifts.

This guide sets out how the two roles differ in mandate, tenure, authority and relationship with the board, when each is the right answer, how interim chief executives are engaged in the UK, and how to hand over cleanly from one to the other. It closes with a side-by-side comparison table and answers to the questions boards ask most often. It is written for chairs, investors, owners and non-executive directors who are about to make the call.

What a permanent CEO is hired to do

A permanent chief executive is appointed without a fixed end date to set the company’s strategy and deliver it over a number of years. The board hires them to own the direction of the business: to build the executive team, shape the culture, allocate capital, manage the most important external relationships and be accountable for performance over the long run. The appointment is usually on an employment contract with a notice period, a salary, and often bonus and long-term incentive arrangements that tie reward to results several years out.

The value of a permanent CEO comes from continuity. Strategy applied consistently over time, a stable leadership team and relationships with customers, lenders and investors that deepen year on year are hard to build any other way. A permanent CEO can start programmes that take three or four years to pay back and still be there to see them through. That is also why the appointment is so consequential: a poor permanent hire is expensive to unwind and can set a business back by years. Our guide to hiring a CEO covers the full process boards should expect to run.

The permanent CEO’s mandate

In practice the permanent mandate is broad and open-ended. The board sets the purpose and the risk appetite; the CEO proposes and runs the strategy within it. They hire and remove members of the executive team, decide how the organisation is structured, and represent the business externally. Success is judged over years against a plan the CEO usually helped write.

What an interim CEO is hired to do

An interim chief executive is appointed for a defined period to deal with a defined situation. The most common triggers are an unexpected departure, a turnaround or cash crisis, a period before or after a transaction, or the gap between a planned exit and the arrival of a permanent successor. Engagements are often measured in months rather than years, and the brief usually has an end point written into it: stabilise trading, complete a restructuring, take the business through a sale, or hold the position until the permanent CEO starts.

Interim CEOs are typically experienced chief executives who have chosen to work this way. They arrive with no history in the business and no stake in its internal politics, which allows them to assess the position quickly and take decisions a long-serving leader might avoid. Because they are not building a career inside the company, they can tell the board things it may not want to hear. Their value is speed and judgement from the first week, not a long-term vision.

The interim CEO’s mandate

A good interim mandate is narrower and more explicit than a permanent one. It should state the objectives, the decisions the interim is expected to take, the decisions reserved to the board, the expected duration and how the engagement ends. Many boards ask an interim to prepare the ground for the permanent hire as part of the brief: clarifying the role, fixing obvious problems in the leadership team and leaving a clear handover.

For businesses that need cover quickly, our interim CEO service sets out how we source and present experienced interim chief executives.

The key differences: mandate, tenure and authority

Tenure

The clearest difference is duration. A permanent CEO is appointed indefinitely, subject to notice. An interim CEO is appointed for a set term or until a defined outcome is reached, often with a review point and an option to extend. Tenure shapes everything else: a leader who expects to be there for five years makes different choices from one who expects to leave in six months.

Focus

The permanent CEO is focused on long-term strategy, growth and building the organisation. The interim is focused on the immediate problem: cash, trading, a transaction, a failing project or simply keeping the business steady while the board recruits. An interim who starts writing a five-year strategy is usually outside their brief; a permanent CEO who only fights fires is not doing the whole job.

Authority

Legally, an interim CEO who is appointed to the board is a director like any other and owes the same general duties under the Companies Act 2006, including the duty to promote the success of the company and to exercise independent judgement. The temporary nature of the role does not dilute those duties. Where the two roles differ is in delegated authority. Boards usually give a permanent CEO wide discretion over the executive team and operational decisions. An interim’s authority is often tighter and more specific, with major commitments such as long-term contracts, senior permanent hires or changes of strategy reserved to the board or to the incoming permanent CEO. Some interims are not appointed as statutory directors at all and operate under a written delegation; the board should decide which approach fits the situation and record it.

Relationship with the board

A permanent CEO and chair build a working relationship over years, and the board increasingly relies on the CEO’s view of strategy. With an interim, the board is closer to the detail. Reporting is more frequent, objectives are reviewed against the brief, and the chair is often in regular contact with the interim between meetings. That closeness is appropriate: the board owns the decision about what happens after the interim leaves, and needs a clear picture of the business to make it.

When to appoint an interim CEO

Interim leadership is the right answer when the business faces a defined situation with a defined horizon. The common cases are:

• An unexpected departure. A CEO resigns, falls ill or is removed, and there is no ready internal successor. Appointing a permanent replacement in a hurry is the classic route to the wrong hire. Interim cover takes the time pressure off the permanent search.
• Turnaround or crisis. Cash is tight, lenders are nervous or trading has fallen away. An interim who has stabilised businesses before can move faster than a permanent hire who is still learning the company.
• A transaction. A sale, refinancing, carve-out or integration needs a leader who will see it through and is comfortable leaving afterwards. Investors often use interims in portfolio companies for this reason; our private equity interim CEO page explains how that works.
• A strategic pause. The board is not yet sure what the next CEO needs to look like, because the strategy itself is under review. An interim can hold the business steady while that is decided, so the permanent brief is written for the business as it will be rather than as it was.
• Planned cover. Extended leave, or a gap between a known exit date and a successor’s start date after their own notice period.

In regulated financial services, timing matters even more. Where the chief executive role is a senior management function, firms can rely on the 12-week rule to cover it temporarily. Under the FCA’s first phase of SMCR reforms, set out in Policy Statement PS26/6 and in force from 24 April 2026, firms now have 12 weeks to submit the application rather than to have it approved, and the person covering can remain in role until the regulator decides. The FCA also expects the Senior Manager Conduct Rules to apply to the person providing cover. Boards of regulated firms should still plan the permanent appointment early, because the approval process itself takes time.

When to appoint a permanent CEO

A permanent appointment is right when the board knows what the business needs for the next several years and is ready to commit to a leader who will own that plan. The strategy is broadly settled, the immediate crisis (if there was one) has passed, and the business needs someone to build rather than repair. That might be a growth phase, a move into new markets, a founder stepping back, or a planned succession from a long-serving CEO.

Because the permanent appointment shapes the business for years, it deserves a thorough search. That means a written brief agreed by the whole board, a clear view of the capabilities the next stage requires, a proper market search rather than relying on whoever is known to the board, structured interviews and careful referencing. A well-drafted CEO job description is a good starting point, and our CEO recruitment team can run the process end to end.

For listed companies, succession is also a governance matter. The UK Corporate Governance Code 2024 and its guidance expect boards to have plans for orderly succession to the board and senior management. A board that has done that work in advance will rarely need to scramble; one that has not will often find interim cover is the sensible first step. Our practical guide to CEO succession planning covers how to build that plan.

How interim CEOs are engaged

Interim chief executives are usually engaged on a day rate rather than a salary. Most work through their own limited company, either contracting directly with the client or through a search firm. The terms are typically set out in a short agreement covering the scope of work, the expected duration, the number of days per week (interim CEOs are normally full-time or close to it), the notice period on each side, expenses, confidentiality and, where relevant, directors’ and officers’ insurance cover.

Day rates vary with the size and complexity of the business, the urgency and the nature of the brief. A turnaround or transaction mandate in a larger business commands a different rate from holding-the-fort cover in a smaller one. We do not publish indicative figures here because they move with the market and the brief; we discuss rates with each client at the outset.

IR35 and employment status

Any interim working through a personal service company falls within the off-payroll working rules, commonly called IR35. Under HMRC’s guidance on off-payroll working, the client is usually responsible for deciding the worker’s employment status, and must issue a status determination statement, unless the client is a small company outside the public sector, in which case the intermediary decides. Interim CEO roles need particular care, because a full-time chief executive who is a statutory director, manages staff and is integrated into the business can look a lot like an employee. Boards should assess each engagement on its own facts and take advice where needed. Our guide to IR35 rules for senior executive engagements covers the practical points.

Speed of appointment

Interim chief executives are generally available at short notice, because they are between assignments rather than serving a long notice period. That is a large part of their value. A permanent candidate, by contrast, may be tied to a notice period of several months with their current employer. The difference in start dates is often what makes interim cover necessary in the first place.

Can an interim CEO become the permanent CEO?

Sometimes. An interim who performs well, fits the culture and wants to stay can be a strong candidate, and the board has the advantage of having seen them at work. But boards should be careful. The skills that make a good interim (rapid diagnosis, decisive action, comfort with short horizons) are not always the skills needed to build a business over five years. Many experienced interims also prefer to keep working on assignments and have no wish to go permanent.

If the board is open to the possibility, it is better to say so at the start and to include the interim in the permanent process alongside external candidates, assessed against the same brief. Appointing the interim by default, simply because they are there and the search feels like effort, tends to produce the same problems as rushing any permanent hire.

Handing over from interim to permanent CEO

The handover is where many interim engagements lose value. The interim has spent months learning the business and taking decisions; if that knowledge leaves with them, the permanent CEO starts from scratch. A planned handover should include:

• A written handover note covering the state of the business, decisions taken and why, open issues and commitments made to staff, customers, lenders and investors.
• An overlap period where the budget and timing allow, so the incoming CEO can meet key people with the interim present and ask questions directly.
• Clear lines on decisions. In the weeks before the permanent CEO starts, the interim should avoid locking in choices that properly belong to the new leader, such as senior permanent hires or long-term strategic commitments, unless the board agrees.
• A defined exit. Once the handover is complete the interim should leave cleanly. A lingering presence confuses staff about who is in charge.
• An onboarding plan for the new CEO owned by the chair, not the interim. Our guide to executive onboarding sets out what the first 90 days should cover.

Permanent CEO vs interim CEO: comparison table

Where fractional CEOs fit

There is a third model that boards sometimes confuse with interim leadership: the fractional or part-time CEO. Where an interim usually works full-time for a defined period, a fractional CEO provides ongoing leadership for a set number of days a week, often over a longer period. It suits smaller or earlier-stage businesses that need senior leadership but cannot yet justify a full-time chief executive. The choice between fractional and interim is a separate question from the one this guide addresses, and we cover it in our companion guide to fractional CEO vs interim CEO.

Making the decision

The question for the board is simple to state and harder to answer honestly: is this a long-term commitment, or a situation to manage? If the business needs someone to own a multi-year plan and the board knows what that plan is, appoint a permanent CEO and take the time to do it properly. If there is a gap, a crisis, a transaction or real uncertainty about the next stage, appoint an interim with a clear brief and use the time to run the permanent search well. Many businesses need both, in that order.

Whichever route the board takes, three things improve the outcome: a written brief that the whole board agrees, clarity about the authority being delegated, and a planned transition at the end. Getting those right matters more than the choice of model. If you would like a second view before deciding, our CEO search team can talk it through with the chair and help you set the brief.

Frequently asked questions

How long does an interim CEO usually stay?

It depends on the brief. Cover for a departure typically lasts until the permanent CEO starts, which includes the search and the successor’s notice period. Turnaround and transaction mandates last as long as the work takes. Most agreements include a review point and an option to extend.

Does an interim CEO have the same legal duties as a permanent CEO?

If they are appointed as a director, yes. The general duties of directors under the Companies Act 2006 apply in full regardless of how long the appointment is expected to last. Where an interim is not on the board, their authority comes from the delegation the board gives them.

Who decides an interim CEO’s IR35 status?

For public sector bodies and medium or large private sector clients, the client decides and issues a status determination statement. For small private sector clients, the interim’s own company makes the determination. Each engagement should be assessed on its facts.

Should an interim CEO apply for the permanent role?

They can, if both sides are open to it. The board should agree that possibility at the outset and assess the interim against the same brief as external candidates, rather than appointing them by default.

Is an interim CEO the same as an outsourced or part-time CEO?

No. An interim usually works full-time for a defined period. Outsourced and part-time CEO arrangements provide leadership for part of the week on an ongoing basis, and suit businesses that need senior judgement without a full-time chief executive.