These two arrangements are regularly presented as alternatives and they are not. An outsourced accounting bureau processes your finance; a fractional Financial Controller is accountable for it. Businesses that buy one expecting the other end up disappointed for entirely predictable reasons — a bureau will not challenge your pricing, and a fractional FC will not process your purchase ledger. This guide sets out what each actually does, what each costs, when you need one or the other, and why a great many businesses under £15m end up with both.
The core distinction
An outsourced accounting bureau — a practice, a bookkeeping firm, or an offshore team — does the work. Transaction processing, bank reconciliations, payroll, VAT returns, and in many cases a monthly management accounts pack produced to a standard template. It is a production service, priced per month against a defined scope, and it scales predictably.
A fractional Financial Controller is a person who owns the outcome. They may do very little processing; what they provide is review, judgement, control design and accountability — someone who will tell you the numbers are wrong, that the margin has moved for a reason nobody has noticed, or that a control gap needs closing before it costs you.
The distinction in one line: the bureau produces the numbers; the fractional FC is answerable for them.
The comparison
| Outsourced bureau | Fractional FC | |
|---|---|---|
| What you buy | Processing and production | Accountability and judgement |
| Typical scope | Bookkeeping, VAT, payroll, standard pack | Close ownership, controls, review, board pack |
| Challenges the business? | Rarely | Yes — that is the point |
| Designs controls? | No | Yes |
| Attends your board? | No | Frequently |
| Available between visits? | Via a service desk | Directly |
| Knows your business? | At transaction level | Commercially |
| Typical cost | £800–£3,000/month | £2,000–£5,500/month |
| Scales with volume? | Yes, priced accordingly | No — priced on days |
What each is genuinely good at
The bureau is good at volume, consistency and cost. Processing a thousand transactions a month reliably is exactly what a well-run bookkeeping operation does, and doing it in-house at that scale is rarely cheaper. They handle statutory filings — including accounts at Companies House and VAT under Making Tax Digital — keep the ledger current, and produce a pack on time.
Bureaux may be regulated practices supervised by a body such as ICAEW or ACCA, which is worth checking. The fractional FC is good at everything that requires judgement. Whether the numbers are right rather than merely complete. Whether the accrual basis still makes sense. Why margin moved. What control is missing. What the board should be worried about. And crucially, telling you something you do not want to hear — which a bureau, as a supplier of a defined service, is structurally unlikely to do.
Where businesses get it wrong
Buying a bureau and expecting control. The commonest error. A business outsources bookkeeping, receives a monthly pack, and assumes finance is handled — then discovers at year-end that the balance sheet has not been reconciled, because nobody asked the bureau to and it was not in scope. Bureaux do what is scoped; they do not notice what is missing.
Buying a fractional FC and expecting processing. The mirror error, and an expensive one. An FC on £550 a day coding invoices is poor value for everyone, and the engagement will not last.
Assuming the bureau’s pack is management information. A standard template produced from the ledger is a report, not analysis. It tells you what happened; it does not tell you why or what to do — the distinction our guide to management reporting that gets read covers.
And assuming either arrangement removes the need for someone internal to own approvals, stock counts and the information finance depends on. Neither does.
The combination that usually works
For businesses roughly between £2m and £15m, the arrangement that works best is generally both: a bureau handling production, with a fractional FC owning the outcome.
The bureau processes transactions, runs payroll, files VAT and prepares a draft. The fractional FC reviews it, owns the reconciliations, designs the controls, prepares the board pack and is accountable for the result. Total cost for a two-day arrangement plus a mid-sized bureau is typically £5,000–£7,000 a month — against roughly £9,000 a month fully loaded for a permanent Financial Controller plus an internal bookkeeper.
Two things make this combination work. The FC must have authority over the bureau’s output — able to send work back, change the process and set the timetable. A bureau reporting only to the founder while the FC reviews after the fact is the worst of both. And the scope split has to be written down, because the gap between what the bureau does and what the FC does is exactly where things fall through.
Our guide to outsourced financial controller services covers the model, and engagement models the scoping.
When you need only one
Bureau only: businesses under about £2m with simple transactions, no external reporting obligations and a founder who is genuinely comfortable with the numbers. Adding senior control at that scale is premature.
Fractional FC only: businesses that already have competent internal transactional staff but no qualified oversight. Here the FC supervises the existing team rather than a bureau, which is frequently the better arrangement because the knowledge stays in the business.
Neither — hire permanently: where the combined requirement fills a week. Our readiness self-assessment works through which situation you are in.
Questions to ask a bureau
If you are buying or reviewing one, four questions establish what you are actually getting. Is the balance sheet reconciled, and can you show me the evidence? The single most useful question, and the answer is frequently no. Who reviews the output before it reaches me? What is explicitly outside scope? — ask for it in writing. And what would you tell me if you thought something was wrong? The answer to the last one tells you whether you have bought production or judgement, and it is almost always production.
A Note from Our Founder — Adrian Lawrence FCA
The conversation I have most often with businesses at around £5m to £10m is that they have outsourced their accounting and cannot understand why finance still feels out of control. The bureau is usually doing exactly what it was asked to do, competently, and what was never asked for is the part they are missing — somebody to look at the output and say the margin has moved and here is why, or that account has not been reconciled since March. That is not a criticism of bureaux; it is not what they sell. My suggestion is to keep the bureau, which is almost always good value for processing, and add a day or two a week of someone accountable for the result. That combination costs a fraction of a permanent hire and it fixes the thing that is actually broken.
Adrian Lawrence FCA
Founder, Accountancy Capital — Fellow of the ICAEW. Verify via ICAEW.
Related Recruitment & Guides
Accountancy Capital places fractional, interim and permanent Financial Controllers across the UK. Every search is led personally by Adrian Lawrence FCA, Fellow of the ICAEW.
Practice Area
Fractional Financial Control
Accountability without a permanent hire.
→ Outsourced Financial Controller Services
→ Fractional Financial Controller
Deciding
Which Arrangement
Readiness, scope and alternatives.
→ Fractional FC Readiness Assessment
→ Engagement Models: Days, Retainers and Scope
The Work
What Control Looks Like
Close, reconciliation and reporting.
→ Internal Controls for Growing Businesses
→ Management Reporting That Gets Read
The Alternatives
Interim and Permanent
When another shape fits better.
→ Financial Controller Recruitment
→ Interim Financial Controller
→ Management Accountant Recruitment
Every search is led personally by Adrian Lawrence FCA, founder of Accountancy Capital and Fellow of the ICAEW. Call 0204 553 8893 or tell us about your requirement.
Working out what your finance function needs?
Same-day response on every brief. Permanent shortlists in 5–7 working days; interim in 48–72 hours.