Expert research
Interim executive: when to hire one and how interim differs from fractional
An interim executive fills a senior role full-time for a set period. When to use one, how interim differs from fractional, published UK day rates and how to set the mandate.
An interim executive is an experienced leader who takes on a senior role, usually full-time, for a defined period: covering a sudden departure, running a turnaround, or holding the seat while you search for a permanent hire. The difference from a fractional executive is mostly time and purpose. A fractional leader works part of the week on an ongoing basis. An interim leader works full-time or close to it, for a set period, and is expected to leave once the job is done.
Some of the most detailed public data on the market comes from the UK. The Institute of Interim Management's 2026 survey of interim managers reported an average assignment length of 10 months and an average day rate of £907 (IIM survey 2026). We did not find a comparable public survey of the US market.
Interim or fractional
| Interim executive | Fractional executive | |
|---|---|---|
| Time | Full-time or close to it | Part of the week |
| Length | A defined period | Ongoing, with no fixed end date |
| Typical reason | A gap, a crisis or a change program | Senior skills the company cannot yet use full-time |
| Done when | The problem is fixed or a permanent leader is in place | The function runs well, or the role becomes full-time |
The line blurs in practice. The IIM asked about it for the first time in 2026 and found that about a quarter of interim managers' most recent assignments were delivered fractionally. Ask each candidate what they would own and how many days a week, rather than relying on the label. What a fractional executive is covers the part-time model.
Two kinds of interim leader
An internal stand-in. A board or CEO asks an existing executive to step up temporarily, for example the CFO when the CEO leaves suddenly. A PanAgora Asset Management study summarized on the Harvard Law School Forum on Corporate Governance found that 798 of 10,537 US CEO successions from 2000 to 2017, about 8%, involved an interim CEO. The authors link interim appointments to missing succession plans.
A professional interim. Someone who takes interim roles as a career, usually through an interim management provider or their own network. Respondents to the IIM's 2026 survey had worked as interims for an average of 10.8 years, and their average age was about 55.
An internal stand-in knows the company but still has a day job. A professional interim has done this before and has no stake in the old structure, but needs time to learn the business.
When an interim executive makes sense
The IIM survey shows what interims are hired for. The most common primary purpose of respondents' last assignment was change or transformation management (37%), and turnaround or restructuring accounted for 13%. Private equity and venture capital firms were the largest type of private-sector client. Common situations:
- A sudden gap. A leader resigns, falls ill or is dismissed, and the work cannot wait for a search.
- A turnaround. Cash is short or results have fallen, and the company needs someone who has run a rescue before.
- A defined change. An acquisition integration, a system implementation or a reorganization with an end point.
- A bridge to a permanent hire. The interim keeps the function running and helps define the permanent role.
It fits less well when the need is ongoing but part-time, where a fractional leader costs less, or when the job is a defined deliverable that someone outside the management line can produce. For that, see hiring a consultant.
What an interim executive costs
Most UK interims are paid a day rate. From the IIM's 2026 survey:
| Measure | IIM 2026 figure |
|---|---|
| Average day rate, all respondents | £907 |
| Average day rate, private sector | £1,004 |
| Average day rate, public sector | £700 |
| Average assignment length | 10.0 months |
| Assignments paid by day rate | 78% |
These are what interim managers report, from a survey of the UK market, so treat them as a guide rather than a quote. If a provider does not publish rates, ask for a day rate and an estimated number of days.
A hypothetical calculation shows how quickly the total grows. At the private-sector average of £1,004 a day, a six-month assignment at five days a week, about 130 working days, comes to about £130,500. If you hire through a provider, ask whether the day rate you are quoted includes its margin. A clear end point keeps the engagement from drifting, which is why the mandate below matters as much as the rate.
A worked example
This example is hypothetical. The CFO of a 200-person manufacturer resigns two months before the annual audit and a test of the company's loan covenants. The CEO has three options:
- Promote the controller to acting CFO. Cheapest, and the controller knows the numbers, but they have never dealt with the lender and would be running the audit and the close at once.
- Hire a fractional CFO for two days a week. Too little time for an audit, a lender negotiation and a team without a leader.
- Hire an interim CFO for six months. Full-time cover through the audit and the covenant test, while the CEO runs a search for a permanent CFO.
The CEO hires an interim and writes a mandate: complete the audit, manage the lender relationship through the covenant test, keep the controller in charge of the monthly close, and help select the permanent CFO. The interim is told at the start that they are not a candidate for the permanent role.
Set the mandate before day one
An interim leader has authority for a short time, so the terms have to be clear from the start. Write down:
- The problem and the end point. What must be true when the interim leaves, and roughly when.
- Decision rights. What they can decide alone, including hiring, firing and spending, and what needs the CEO or board.
- Whether they can become the permanent hire. Decide this early because it changes incentives. A study cited in the PanAgora summary found interim CEOs more likely to manage reported earnings to improve their chances of being made permanent, and that effective governance weakened the link.
- The handover. What the permanent leader will receive: documents, open issues, a briefed team.
- Reporting. A weekly check-in with the CEO or board chair.
Contracts and classification
In the US, the IRS decides whether someone is an employee by weighing behavioral control, financial control and the type of relationship, with no single factor deciding. A full-time interim who works under your direction raises the behavioral-control question. Misclassifying an employee as a contractor without a reasonable basis can leave the business liable for employment taxes. In the UK, the IIM notes that under the IR35 rules the end client must provide a Status Determination Statement unless the client is a defined SME, and that 53% of its respondents had not received one. Get advice before you sign. This is general information, not legal or tax advice.
Your next step
Write one paragraph describing what must be true when the interim leaves. If you cannot write it, you may need a fractional leader or a consultant instead.
Before you hire, a 30-minute call with someone who has held an interim role in a similar situation can tell you what the first month should achieve and how long the assignment is likely to take. Instant Expert can find people who match a description such as "interim CFOs who led a manufacturer through an audit and a lender negotiation." You review who it finds, it sends your invitations and you pay for each call that gets booked. The directory pages for interim CFOs and interim CEOs are one place to start. How to prepare for an expert interview covers what to bring.