Fractional or interim CIO: the short answer

A fractional CIO works with you on a part-time, ongoing basis, typically one or two days a week or month, giving you continuous senior direction without a full-time salary. An interim CIO works full-time for a fixed period to cover a gap, lead a transformation or stabilise a function until a permanent hire arrives. The difference is not seniority, both are experienced leaders, it is the shape of the commitment. Fractional is a long relationship at low intensity. Interim is a short relationship at high intensity. Pick fractional when you need steady oversight and pick interim when you need someone in the chair now.

What a fractional CIO or CISO does

A fractional CIO or CISO owns your technology and security agenda for a fraction of the week. They set the strategy, chair the right governance, keep the roadmap honest and act as the senior point of accountability when the board asks hard questions. Because the engagement is ongoing, the value compounds: they learn your business, build the relationships and steer decisions over quarters rather than parachuting in for a single project. This model suits a company that has outgrown ad hoc IT but cannot justify a six-figure permanent salary. If your security need is the sharper one, the same logic produces a virtual CISO, and our guide to what a vCISO is explains where that line sits.

What an interim CIO or CISO does

An interim CIO or CISO steps in full-time to hold a role that is empty or in crisis. The brief is bounded: stabilise the function after a sudden departure, run a complex programme through to delivery, prepare the technology estate for a transaction, or steady the ship while you recruit a permanent leader. Interim leaders are comfortable making decisions quickly, because they are paid to act, not to settle in. A good interim leaves the function in better shape than they found it, with a clear handover so the permanent successor inherits order rather than chaos. When a deal is driving the timeline, interim cover often runs alongside technology due diligence so the same person who assesses the estate can then fix it.

How to choose between them

Start with the trigger. If a leader has just left, or a board has just mandated a transformation with a deadline, you almost certainly need interim cover, because the work is full-time and time-boxed. If the trigger is slower, you have outgrown your current IT arrangement, the board wants better technology governance, or your cyber exposure has crept past what part-time advice can manage, fractional is the better fit because the need is continuous but not full-time.

Then weigh three things honestly:

• Intensity. Does the work fill a week, or fill a day or two a week? Full weeks point to interim. Partial weeks point to fractional.
• Duration. Is there a defined end, such as a permanent hire or a programme go-live? A clear endpoint points to interim. An open-ended steering need points to fractional.
• Continuity. Do you want the same trusted leader for years, or the right specialist for a season? Long-term continuity points to fractional. A bounded mission points to interim.

The two models are not rivals and they often follow each other. A common pattern is interim cover to stabilise a function, then a fractional arrangement to keep it on track once the fire is out. Our CIO versus CISO explainer helps if you are also unsure whether your gap is broad technology leadership or focused security leadership, which is a separate question from fractional versus interim.

What each costs, and why it matters

Cost is where the choice becomes concrete. A permanent UK CISO salary runs roughly £95,000 to £600,000 or more depending on sector and scope, before recruitment fees, equity, bonus and the months it takes to hire. Fractional and interim both let you access that calibre of leadership without carrying the full fixed cost. Fractional is the lower monthly commitment because you buy a slice of the week on an ongoing basis. Interim is a higher monthly cost because you buy the full week, but only for a defined window, so the total outlay is contained by the end date. The right comparison is not day rate against salary, it is the cost of the right decisions made early against the cost of drift, a breach or a botched programme. Our pricing page sets out how engagements are structured so you can see which shape suits your budget.

Where the work usually starts

Whichever model you choose, the early work tends to look similar: get a clear picture of the technology and security estate, fix the governance so the board sees the right risks, and set a roadmap that survives contact with reality. From there the engagements diverge. Fractional leaders carry that roadmap forward over time, often folding in board cyber governance, AI governance and a sane IT operating model. Interim leaders drive a defined outcome hard, whether that is standing up an incident response plan, getting ahead of NIS2 compliance, or delivering broader cyber security consulting work to a deadline. Ongoing security oversight is frequently delivered as CISO as a service once the urgent phase is done.

Why Starkhorn

Starkhorn is led by Daniel J. Jacobs, who has spent over 20 years in technology and security, 15 of them in leadership roles, including Interim Group Technology Director at VetPartners, the BC Partners-backed veterinary group, and CIO and CISO at Jardine Motors Group. He is the author of The Strategy Bridge and holds PRINCE2, ITIL Foundation and full membership of the Institute of Interim Management.

Having held both an interim group technology role at VetPartners and a permanent CIO and CISO seat at Jardine Motors Group, Daniel has worked from inside each model and can tell you straight which one your situation calls for.

Frequently asked questions