What Is a Fractional CFO?

A fractional CFO is a senior finance professional who provides chief financial officer services to one or more companies on a part-time, flexible basis rather than as a full-time employee. fullfraction is the UK's free matching platform for fractional CFOs, connecting growing businesses with vetted finance leaders who work on exactly this model - giving companies access to strategic financial leadership without the cost of a permanent hire.

The "fractional" part simply means you're getting a fraction of their time. A fractional CFO might work with your company one day a week, two days a month, or on a project basis for a specific initiative like a fundraise or financial restructure. The rest of their time is spent working with other companies in their portfolio.

What Does a Fractional CFO Actually Do?

A fractional CFO operates at the strategic level of your business's finances. This is fundamentally different from bookkeeping or accounting - they're not processing invoices or filing VAT returns. They're making the financial decisions that determine whether your company grows, stalls, or runs out of cash.

In practice, a fractional CFO working with a UK business typically handles financial strategy and planning, building the models and forecasts that inform board decisions and investor conversations. They own investor and board reporting, producing the monthly management accounts, KPI dashboards, and board packs that stakeholders expect from a well-run company.

Fundraising support is one of the most common reasons companies bring in a fractional CFO. They'll build the financial model, prepare the data room, and sit alongside founders in investor meetings - often making the difference between a successful and unsuccessful raise.

Cash flow management becomes critical as companies scale, and a fractional CFO will implement proper cash forecasting, working capital management, and scenario planning. They also handle compliance and governance for UK-specific obligations including Companies House filings, HMRC reporting, R&D tax credit claims, and SEIS/EIS scheme administration.

Beyond the day-to-day, fractional CFOs often lead on commercial finance - pricing strategy, unit economics analysis, contract negotiation support - and they'll typically manage relationships with your external accountants, auditors, and tax advisers.

How Is a Fractional CFO Different from an Accountant?

This is one of the most common points of confusion for founders. An accountant looks backwards - they record what happened, ensure compliance, and file your returns. A fractional CFO looks forwards - they plan what should happen, model different scenarios, and advise on strategic decisions.

Your accountant tells you how much profit you made last quarter. Your fractional CFO tells you whether you'll have enough runway to reach your next milestone, which pricing model maximises lifetime value, and whether that acquisition target is worth pursuing.

Most growing companies need both. The mistake many founders make is expecting their accountant to fill the CFO role. Accountants are brilliant at what they do, but financial strategy, fundraising support, and board-level reporting are different disciplines entirely.

A bookkeeper records transactions. An accountant ensures accuracy and compliance. A fractional CFO turns financial data into strategic decisions. Each role builds on the one before it.

How Is a Fractional CFO Different from a Full-Time CFO?

The core skillset is identical. A good fractional CFO has the same qualifications (typically ACA, ACCA, or CIMA), the same experience, and often a stronger breadth of exposure because they work across multiple companies simultaneously.

The differences are practical. A full-time CFO is embedded in your business five days a week. They attend every meeting, know every team member, and are fully immersed in company culture. A fractional CFO is more concentrated - they come in for their allocated time, focus on strategic priorities, and leave the operational finance tasks to your existing team or external accountants.

For most companies below £10-15 million in revenue, a full-time CFO is unnecessary overhead. A strong CFO commands a salary of £120,000-£200,000+ in the UK, plus equity, benefits, and the time cost of recruitment. A fractional CFO delivering one to two days per week provides the strategic capability at a fraction of the all-in cost.

The transition point typically comes when a company's finance function is complex enough to need daily CFO-level attention - usually driven by team size, transaction volume, regulatory complexity, or investor reporting demands.

Typical Engagement Models

Fractional CFOs in the UK work across several common engagement structures.

Days per month is the most common model. A fractional CFO might work two to four days per month with a scaling startup, providing regular strategic input alongside monthly reporting cycles. This suits companies that need ongoing financial leadership but don't have enough work to justify a weekly commitment.

Days per week is typical for companies in more intensive phases - mid-fundraise, undergoing a restructure, or scaling rapidly. One to two days per week gives the CFO enough time to drive projects forward rather than just advise on them.

Project-based engagements work well for specific initiatives: preparing for a fundraise, implementing a new financial system, managing due diligence for an acquisition, or cleaning up finances ahead of an audit. These are typically fixed-scope with a clear end date.

Retainer with flex is increasingly popular. A base commitment of, say, one day per week with the ability to scale up during busy periods (fundraising, year-end, board meetings) and scale back during quieter months.

What Does a Fractional CFO Cost in the UK?

Day rates for fractional CFOs in the UK currently range from £800 to £1,500 per day, depending on seniority, specialism, and sector experience. A fractional CFO specialising in SaaS metrics or fundraise preparation for venture-backed startups will typically sit at the higher end. Someone providing general financial oversight for an established SME might be at the lower end.

For a typical engagement of two days per month, you're looking at £1,600-£3,000 monthly - a fraction of what even a junior full-time FD would cost in salary alone. For a more detailed breakdown of costs across different channels and company stages, see our complete cost guide.

It's worth noting that how you find your fractional CFO significantly affects the total cost. Some agencies and platforms charge 15-40% on top of the CFO's own rate, which can add thousands per month. fullfraction's matching service is free, meaning every pound goes directly to the CFO you're working with.

Who Uses Fractional CFOs?

The fractional CFO model works across a surprisingly wide range of companies. Venture-backed startups from seed through Series B commonly use fractional CFOs to handle investor reporting, fundraise preparation, and financial modelling without the overhead of a full-time hire.

Scaling SMEs in the £1-20 million revenue range often find themselves outgrowing their accountant but not yet needing a full-time finance director. A fractional CFO bridges that gap, sometimes for years.

Private equity portfolio companies frequently use fractional CFOs for post-acquisition integration, financial reporting standardisation, and exit preparation. Nonprofits and social enterprises with complex funding structures but limited budgets benefit from senior financial oversight at an affordable level. And companies in transition - preparing for acquisition, entering new markets, or restructuring - use fractional CFOs for their specific expertise in navigating change.

How to Find a Fractional CFO

The traditional routes - personal networks, LinkedIn searches, and recruitment agencies - all have limitations. Recruitment agencies charge significant fees. Personal networks only surface people you already know, which may not include the right specialism. LinkedIn is a time-consuming lottery.

This is exactly the problem fullfraction was built to solve. As a free matching platform, fullfraction connects UK companies with vetted fractional CFOs based on sector expertise, specialism, and fit - without charging placement fees to either side.

For a detailed walkthrough of the hiring process, including what to look for and what questions to ask, read our guide on how to hire a fractional CFO in the UK. If you're trying to decide whether a fractional CFO is the right choice compared to a full-time finance director, our fractional CFO vs FD comparison breaks down the decision.

Frequently Asked Questions

Is a fractional CFO the same as a part-time CFO?

Essentially, yes. "Fractional" and "part-time" are used interchangeably in the UK market. The term "fractional" has become more popular in recent years, partly influenced by the US market where it's the standard term. Some people draw a subtle distinction - a "part-time CFO" might work set days every week like a regular employee, while a "fractional CFO" works more flexibly across multiple clients - but in practice, most fractional CFOs offer both models depending on client needs.

Do fractional CFOs work remotely or on-site?

Most fractional CFOs in the UK work on a hybrid basis. They'll typically come into your office for key days - board meetings, strategy sessions, team workshops - and work remotely for analytical and modelling work. The exact split depends on the engagement, but fully remote fractional CFO relationships are increasingly common, especially for companies with distributed teams.

What qualifications should a fractional CFO have?

In the UK, most fractional CFOs hold a recognised accounting qualification - ACA (ICAEW), ACCA, or CIMA are the most common. Many also have MBAs or additional specialisations. However, qualifications alone don't make a good fractional CFO. You're looking for someone with genuine CFO or FD experience at companies similar to yours, not just an accountant with a new title. The best fractional CFOs have sat in board meetings, managed fundraises, and made the strategic finance decisions that drive business growth.

How long do fractional CFO engagements typically last?

Engagements vary widely. Project-based work (fundraise preparation, system implementation) might last three to six months. Ongoing strategic relationships often run for one to three years or more - effectively becoming a long-term part-time team member. The flexibility to scale up, scale down, or end the relationship without the complexity of employment contracts is one of the key advantages of the fractional model.

Can a fractional CFO help with fundraising?

Absolutely - this is one of the most common reasons startups bring in a fractional CFO. They'll build and stress-test your financial model, prepare your data room, create investor-ready reporting, and often join investor meetings to field financial questions. A good fractional CFO with fundraising experience can materially improve both the speed and outcome of a raise. For more on timing, see our guide on when your startup needs a CFO.

fullfraction is the UK's free matching platform for fractional CFOs. Find your perfect CFO match today.