What Is a Fractional CFO? A Plain-English Guide for UK Founders
A fractional CFO gives you board-level finance leadership for a few days a month — forecasting, pricing, margins and funding — without a six-figure salary.
7 min read
Key takeaways
- A fractional CFO is a part-time, ongoing finance leader — not a bookkeeper and not a one-off consultant.
- The role is forward-looking: cash forecasting, pricing, margins, funding and growth decisions.
- Most UK SMEs engage one for one to four days a month on a fixed monthly retainer.
- It typically costs a fifth to a third of a full-time finance director.
The short definition
A fractional CFO (also called a fractional FD or part-time finance director) is an experienced chief financial officer who works with several businesses at once, giving each of them a defined slice of their time. You get the judgement of someone who has run finance at a larger company, applied to your business, for a fraction of the cost and commitment of a full-time hire.
The key word is ongoing. A fractional CFO isn't parachuted in for a single project and gone: they sit alongside you month after month, know your numbers, and are in the room when you make decisions about pricing, hiring, borrowing or selling.
What a fractional CFO actually does
Day to day, the work splits into three buckets: visibility, decisions and controls.
- Visibility: management accounts you can trust, a rolling 13-week cash flow forecast, and a short KPI dashboard that tells you how the month is going before it ends.
- Decisions: pricing and margin analysis, hiring and investment cases, scenario modelling, budget setting, and preparing numbers for lenders or investors.
- Controls: tightening credit control and payment terms, tidying the chart of accounts, improving month-end close, and making sure tax and filing obligations are never a surprise.
Fractional CFO vs accountant vs bookkeeper
A bookkeeper records what happened. An accountant reports and files what happened, and keeps you compliant. A fractional CFO uses what happened to change what happens next. All three matter, and a good fractional CFO works alongside your existing accountant rather than replacing them.
If your question is 'are my accounts filed correctly?', you need your accountant. If your question is 'can I afford to hire, and what happens to cash if I do?', that's CFO work.
When a UK SME is ready for one
There's no exact revenue threshold, but the common triggers are consistent. Turnover somewhere between £300k and £10m, growth that isn't translating into cash, pricing that hasn't been reviewed in years, a funding round or bank facility on the horizon, or a founder spending evenings in spreadsheets instead of running the business.
The other honest signal is decision anxiety: if you're delaying hires, investment or price rises because you can't see the consequences clearly, that uncertainty is already costing you more than the retainer would.
How an engagement usually works
Most engagements start with a short diagnostic — a look at your accounts, cash position and systems — followed by a fixed monthly retainer covering an agreed scope. Expect a monthly numbers review, an updated forecast, and availability between sessions for the decisions that can't wait. Contracts are typically rolling monthly or quarterly, so you're never locked in for a year.
Frequently asked questions
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