Fractional, Interim or Permanent Executive: A Complete UK Guide

Fractional, Interim or Permanent Executive: A Complete UK Guide

The choice between fractional, interim and permanent executive engagement is one of the most consequential single decisions a firm makes when bringing in senior leadership — and one of the most consistently misunderstood. The three engagement models are substantively different in time commitment, economics, expectations, contractual structure and the candidate market each draws from. UK firms that map their need against the wrong model often produce worse outcomes than firms that wait longer to make the right choice. The decision matters because the engagement model shapes the executive’s economic incentives, working pattern, depth of integration with the firm, and realistic ability to deliver on what the firm is asking for.

This guide is written for chairs, CEOs, founders and shareholders making decisions about how to engage senior leadership for specific situations. It covers the substantive differences between the three models, when each fits, the candidate markets each draws from, compensation and economic structures, and common pitfalls in choosing the wrong model. For our service pages covering specific fractional and interim engagements, see fractional executive recruitment and interim executive recruitment. For role-specific hiring guides, see our Knowledge Centre.

The three models, defined

Before working through which model fits which situation, it’s worth being clear what each model actually involves.

Permanent. The executive joins the firm as an employee on a standard employment contract — typically with notice periods of three to twelve months, full participation in the firm’s compensation and benefits, and indefinite tenure. The expectation is multi-year integration with the firm’s strategic and cultural fabric. Permanent is the default model for senior roles where continuity matters and where the firm has established the role’s permanent place in the executive team.

Interim. The executive engages on a defined-period basis — typically three to eighteen months, with a clear end date or specific exit criteria. The engagement is full-time during the period but contractually time-bound. Interim executives are typically engaged through their own limited company on a daily or weekly rate basis, without employee benefits. The model fits transitions, turnarounds, transformation programmes, and gaps between permanent appointments.

Fractional. The executive engages on a part-time basis — typically two or three days per week, with the executive often working with two or three firms simultaneously. The engagement is usually structured through the executive’s limited company on a monthly retainer or daily-rate basis. Fractional executives are typically permanent in their relationship with the firm but part-time in their time commitment. The model fits firms where senior leadership warranted at executive level but where the firm’s scale doesn’t justify a full-time appointment.

When each model fits

The following table summarises the situations each model best fits.

Permanent fits when:

• The role is structurally permanent in the executive team and continuity matters over multiple years.
• The firm has the scale to justify the full-time cost.
• The strategic agenda requires deep integration with the firm’s culture, customers, and operating rhythm.
• The role is regulated under FCA SMCR or equivalent (most regulated roles work poorly as interim or fractional).
• The candidate market for the role is dominated by candidates seeking permanent roles.

Interim fits when:

• The firm faces a defined transition — turnaround, post-acquisition integration, transformation programme, regulatory remediation — with a clear end date or set of exit criteria.
• The firm needs senior capability now and the permanent search is in progress, requiring a bridge.
• The specific work is best delivered by a candidate chosen for prior similar transition experience rather than long-term cultural fit.
• The engagement period is six to eighteen months and the candidate market is structured around interim availability (typical for senior interim CFOs, COOs and CROs).

Fractional fits when:

• The firm has crossed the threshold where senior leadership at executive level is warranted, but the firm’s scale doesn’t yet justify full-time cost.
• The strategic work warrants senior capability but the day-to-day execution warrants a lighter touch.
• The firm is in growth mode and expects to upgrade to full-time as scale increases — fractional bridges that progression.
• The role is well-suited to part-time engagement (CFO, CMO, COO often work well fractionally; some roles like CEO work less well).

Common situations and which model fits

Five situations recur where the engagement-model decision is most consequential.

Founder-led business adding its first senior leader. Often a fractional appointment is the right answer. The firm has reached the threshold where senior leadership warranted but typically not yet the scale where full-time cost is justified. Strong fractional CFOs, COOs and CMOs at this stage create the platform for full-time appointments later. See our fractional CFO, fractional COO, and fractional CMO.

Mid-market firm following PE investment. Typically permanent appointments — the sponsor expects full-time senior leadership in the management team and the value-creation horizon makes part-time arrangements harder to justify.

Firm in turnaround or post-failure rebuild. Typically interim appointments. The work is defined-period, the candidate market is structured around interim availability, and the candidate is chosen for prior turnaround experience rather than long-term cultural fit. See our interim CEO, interim CFO, and other interim service pages.

Bridge during permanent search. Interim executive engaged for the period from departure of the previous permanent leader through to start of the new permanent appointment — typically four to twelve months. Standard pattern for senior roles where the gap cannot be left unfilled.

FCA-regulated firm with SMF requirements. Permanent is the standard answer for SMF-designated roles. Some interim arrangements work if the firm has FCA approval pre-confirmed, but the regulatory dimension makes most fractional arrangements impractical for SMF roles.

Compensation and economics

The three models produce materially different economics for both firm and executive.

Permanent compensation follows the standard four-component structure — base salary, annual bonus, long-term incentives, benefits — with the levels varying substantially by firm size and sector. Total cost to firm typically 25-30% above base salary for benefits and employer NI. See our Executive Compensation guide for the detail.

Interim compensation is typically structured as a daily rate ranging from £750 to £2,500+ depending on role seniority and market segment. The candidate is engaged through their limited company; firm pays the rate plus VAT, with the executive responsible for their own tax, NI and benefits. Total cost to firm is materially higher than equivalent permanent on a daily basis but the engagement is time-bound. Strong interim CFOs and CEOs at the senior end of the UK market typically earn £1,500-2,500 per day.

Fractional compensation is typically structured as a monthly retainer ranging from £8,000 to £20,000+ for two-to-three-days-per-week engagement, depending on role and firm size. The engagement is through the executive’s limited company. Total cost to firm is substantially lower than permanent equivalent because the time commitment is partial. Some fractional engagements include success-related elements (warrants, equity options) for high-growth situations.

Common pitfalls in choosing the wrong model

Six patterns recur. Choosing fractional based on cost when the situation needs full-time. A fractional CFO is not a substitute for a full-time CFO when the firm’s strategic agenda requires the latter. Choosing interim when permanent is needed. Interim engagements end; if the firm needs continuous senior leadership over multiple years, the interim model produces gaps. Choosing permanent when the situation is genuinely transitional. Permanent appointments to time-bound situations often end uncomfortably when the candidate’s fit becomes mismatched with the firm’s evolving needs. Underestimating the SMF-permanent constraint. Most regulated firm SMF roles work poorly outside permanent structures. Mismatched expectations on time commitment. Fractional engagements specifically need clear definition of what the two-or-three-days actually means in practice. Compensation structures that don’t fit the model. Trying to apply permanent compensation to interim engagements, or interim economics to fractional engagements, produces friction.

How Exec Capital approaches each model

Exec Capital runs engagements across all three models. Our practice covers permanent retained search for most senior appointments, interim placements for transition and turnaround situations, and fractional engagements through our specific fractional service pages. The framing-the-engagement-model conversation is part of the front-end work we do with every prospective client.

For boards weighing engagement models for a specific senior need, evaluating whether existing engagement structures should be refreshed, or considering progression from one model to another (typically fractional to permanent as the firm scales), we offer a structured initial conversation. Every senior engagement is led personally by Adrian Lawrence FCA.

Further reading

For our fractional executive recruitment services across roles, see fractional executive recruitment, fractional CFO, fractional COO, fractional CMO, fractional Managing Director, and other fractional service pages.

For interim executive recruitment, see interim executive recruitment, interim CEO, interim CFO, interim COO, interim Managing Director, and other interim service pages.

For related methodology guides, see our Executive Search Methodology guide, Executive Onboarding guide, and Executive Compensation guide. For our complete senior hiring guide collection, see our Knowledge Centre.