What does a fractional CFO do?

And does your business need one?

By Candice Brett, Managing Director, Pivotal Finance

If you own or lead a scaling business, chances are you have landed here because the finances are not keeping pace with the growth. You know you need more senior financial input, but you’re not sure a full-time hire is the right move yet.

This is where the fractional CFO model has become one of the most practical options available to ambitious businesses. Demand for fractional and interim financial leadership surged by over 100% in 2024, and it is not hard to see why. Businesses at every stage of growth are discovering that senior finance expertise does not have to mean a senior finance salary.

But what does a fractional CFO do? And how do you know whether your business needs one?

The difference between a CFO and an accountant

Your accountant, whether in-house or external, is often focused on the historical record. They make sure the books are accurate, the returns are filed, and the compliance boxes are ticked.

A CFO’s role, however, is forward-facing. They take the financial data your business produces and use it to inform strategy: Where is the cash going? What does the runway look like in six months? Is the business ready to raise?

A fractional CFO does all of that, on a part-time or project basis, embedded into your business rather than parachuting in from the outside. They attend board meetings, challenge assumptions, build financial models and work alongside the leadership team as a genuine partner.

What does a fractional CFO do day to day?

The scope varies depending on what a business needs, but in practice it typically covers financial strategy and forecasting, building multi-year plans and scenario models, board-level reporting, KPI development and cash flow management. Many fractional CFOs also lead on fundraising preparation, investor relations and, where relevant, M&A or exit planning.

What distinguishes good fractional CFO work from simply reporting the numbers is the commercial judgement that sits behind it. Understanding what the figures mean for the decisions in front of you is where the value lies.

“Understanding what the figures mean for the decisions in front of you is where the value lies.”

Who typically needs a fractional CFO?

Businesses at a surprisingly wide range of stages benefit from this kind of support.

Early-stage businesses are often the most obvious fit. When you are pre-revenue or pre-seed, you need someone who can build the financial foundations properly and make sure the business is structured to scale. Getting this right early saves significant time and money later.

Scale-ups going through a fundraising round are another common entry point. Investors expect a level of financial rigour that most founders have not had reason to build yet. With investors increasingly demanding robust financial models before committing capital, having someone who has been through multiple rounds and knows exactly what due diligence looks like is worth a great deal.

Established businesses benefit too, particularly those going through transition: a change in ownership, a significant acquisition, or a period of rapid growth that the finance function has not kept pace with. Businesses between CFOs, whether through departure or a planned transition, also use fractional arrangements to maintain continuity while they find the right permanent hire.

What does it cost?

It all depends on the scope and level of expertise you require.  A full-time CFO in the UK typically costs between £130,000 and £220,000 in base salary, with employer National Insurance (which increased to 15% from April 2025), pension contributions and benefits adding a further 20 to 30% on top. Often there are additional bonuses and long term incentive plans that also need to be considered.

For most growing businesses, that full-time commitment is neither affordable nor necessary at this stage. A fractional arrangement gives you the same calibre of thinking at a fraction of the cost, with none of the fixed overhead.

“A fractional arrangement gives you the same calibre of thinking at a fraction of the cost.”

How is a fractional CFO different from an interim CFO?

People often use these terms interchangeably, but there is a distinction. An interim CFO is typically brought in on a full-time basis to cover a specific gap, usually while a permanent hire is being recruited. They are fully embedded for a defined period, and their brief is continuity.

A fractional CFO works part-time, normally across more than one client. The engagement is often ongoing rather than transitional, and the model suits businesses that need senior finance thinking on a sustained basis without requiring a full-time presence. Fractional CFOs can also be brought in to support existing teams to deliver on a key project or transaction when additional resource is needed.

Both arrangements have their place, the question is what your business needs right now.

How do you know if you are ready?

There is no single trigger point, but there are patterns you may recognise. If financial decisions are being made on instinct rather than data, if you are approaching a fundraise or acquisition without experienced support, if your finance function is reporting history rather than informing the future, or if you are scaling quickly and the numbers are not keeping pace, these are all relevant signals.

The other common scenario is simply wanting to do things properly from the start. Many founders who have been through a growth journey before, choose to bring in fractional finance expertise early, because they know what gets complicated later when the foundations are not right. If you are thinking of doing some kind of transaction in the future, then having the right infrastructure and control from day one means you can focus on what you do best - running the business, knowing the finance is under control.

A final thought

The fractional model has grown because it fills a gap that has always been there. For many years, businesses that could not justify a full-time senior hire simply went without; the expansion of the fractional market in the UK has changed that.

Senior financial thinking that is available when you need it, that can scale as your business does, is now more important than ever. In an increasingly competitive market, it may be worth considering earlier than you think.

If you would like to talk through whether a fractional CFO might be right for your business, book a free discovery call with the Pivotal Finance team.