What is a fractional CFO, and how is it different from hiring someone full-time or bringing in interim cover? Those two questions, along with cost, are usually what businesses want answered before committing to any option. The cost question looks different depending on whether a business is based in the UK or the US, so this guide breaks down the role, the comparisons, and the cost for both markets side by side.
The Role of a Fractional CFO
A fractional CFO is a senior finance professional who takes on Chief Financial Officer responsibilities for a business on a part-time, contract, or retainer basis. Rather than joining one company full-time, a fractional CFO typically supports several businesses at once, dedicating an agreed number of days each month to each client. The arrangement works the same way whether a business is based in the UK or the US: you get executive-level financial leadership, from half a day a week to several days a month, without the salary, benefits, or long-term commitment of a full-time hire.
The role sits above a financial controller or accountant. Where those roles focus on accuracy, compliance, and day-to-day bookkeeping, a fractional CFO focuses on strategy: cash flow forecasting, fundraising, and the financial decisions that shape where a business goes next.
What does a fractional CFO do?
A fractional CFO’s exact remit depends on the business, but most engagements cover a similar core set of responsibilities:
- Financial forecasting and modelling: building cash flow projections, budgets, and scenario plans that inform strategic decisions.
- Fundraising support: preparing financial narratives, data rooms, and investor materials, then representing the business through due diligence.
- Board and investor reporting: producing management accounts and KPI dashboards that give leadership a clear read on performance.
- Cash flow management: tightening credit control, managing working capital, and flagging risk before it becomes a crisis.
- Systems and process improvement: implementing or upgrading accounting platforms such as Xero, QuickBooks, or NetSuite, and automating reporting that used to take days to produce.
Priorities shift with the stage of the business. A pre-seed startup preparing to raise capital needs different support from a scale-up trying to get cash flow under control after a period of rapid growth.
Fractional CFO vs full-time CFO
| Full-time CFO | Fractional CFO | |
|---|---|---|
| Cost | Salary, benefits, and often equity, typically six figures annually in both the UK and US | Day rate or monthly retainer, paid only for the time used |
| Time commitment | Full-time, embedded in the business | Agreed days per week or month, scaled up or down as needed |
| Contract length | Permanent | Rolling or fixed-term, usually with no long-term tie-in |
| Best suited to | Larger businesses with consistent, high-volume financial complexity | SMEs and scale-ups that need senior expertise but not a full-time seat |
How is this different from an interim CFO?
An interim CFO fills a specific, time-limited gap, usually working full-time hours while a business searches for a permanent hire or manages a defined event such as an acquisition. A fractional CFO’s role is ongoing rather than transitional. The part-time arrangement is the intended long-term model, not a stopgap.
How much does a fractional CFO cost?
Costs vary by market, though the underlying saving against a full-time hire holds in both. Our own client data puts the typical reduction in employment costs at around 40% when a business moves from a full-time hire to a fractional arrangement.
UK costs
UK day rates for a fractional CFO typically sit between £900 and £1,300, often billed based on a number of days worked or sometimes as a monthly retainer against an agreed number of days. Set against a full-time CFO salary, which regularly exceeds £150,000 once benefits and equity are factored in, the saving is substantial. One consideration specific to the UK: where a fractional CFO operates through a personal service company, the engagement should be assessed against HMRC IR35 rules to confirm the correct employment status.
US costs
US day rates generally run between $1,200 and $2,000, billed on the number of days worked or with the same retainer structure common for ongoing arrangements. A full-time CFO salary in the US regularly exceeds $250,000 once benefits and equity are factored in, so the fractional route offers a comparable saving to the UK model.
Signs your business might need one
A handful of situations tend to prompt businesses to bring in fractional CFO support:
- Preparing for a funding round and needing investor-ready financials
- Losing visibility over cash flow as the business scales
- Outgrowing founder-led or bookkeeper-led finance
- Approaching an acquisition, merger, or exit
- Facing increased reporting demands from a board or investors
Read our guide on When to Hire a CFO for more information.
How Hire CFO can help
Hire CFO places experienced fractional CFOs with businesses across the UK and US, matching you with a CFO suited to your industry, stage, and the specific problems you’re trying to solve. Support scales with your business, from a couple of days a month to more intensive project work, with the cost savings outlined above and no long-term contract required. Explore Hire CFO’s fractional CFO services to see how it works, or get in touch to talk through what your business needs.
Frequently asked questions about fractional CFOs
How many days a month does a fractional CFO typically work?
Most engagements start at two to four days a month and scale up as the business’s needs grow, though some businesses bring in more intensive support during a funding round or acquisition.
Can a fractional CFO work remotely?
Most fractional CFO engagements run remotely or on a hybrid basis, with occasional in-person time for board meetings or key strategic sessions.
Is a fractional CFO the same as an outsourced CFO?
The terms are often used interchangeably. Both describe a senior finance professional supporting a business on a part-time or contract basis, rather than as a direct employee.
What size of business typically hires a fractional CFO?
Fractional CFOs mostly work with SMEs and scale-ups, from early-stage startups preparing to raise capital through to established businesses managing complex growth.
Does a fractional CFO replace an accountant or bookkeeper?
A fractional CFO works alongside an accountant or bookkeeper rather than replacing them. Accountants and bookkeepers handle compliance and day-to-day transactions, while a fractional CFO focuses on strategy and financial leadership.
How quickly can a business bring in a fractional CFO?
There’s no lengthy recruitment process for a permanent hire, so most businesses can have a fractional CFO in place within a few weeks of first getting in touch.
