The Finance Gap Between £5m and £30m

There is a range of business size where finance reliably stops working, and it is narrower and more predictable than most founders expect. Below roughly £3m, a bookkeeper and a good external accountant genuinely covers it. Above roughly £30m, the business can justify a full finance function with a Financial Controller, a management accountant and transactional staff.

Between those two points sits a gap that most growing UK businesses fall into, and it is where the majority of finance frustration in the mid-market lives. The symptoms are consistent: numbers arriving late, a founder spending evenings on management accounts, an external accountant asking questions nobody internally can answer, and a growing sense that decisions are being made on instinct because the analysis is not available.

Why the gap exists

The gap is created by a mismatch between two things that grow at different rates.

Transaction volume grows roughly with revenue. Twice the turnover means roughly twice the invoices, twice the payments, twice the reconciling. That is a linear increase in processing, and processing is comparatively cheap to add — another part-time bookkeeper, or an outsourced bureau.

But the need for judgement grows in steps. A business acquires a genuine requirement for qualified financial control at a particular moment — usually when it takes on debt with covenants, brings in an investor, starts trading internationally, acquires something, or simply reaches a scale where the founder can no longer hold the whole picture in their head.

The result is that the need for judgement arrives some way before the volume justifies a full-time person to supply it. A business at £8m may genuinely need someone accountable for the numbers, the controls and the reporting — and have perhaps two days a week of that work.

What the business actually needs

It is worth being precise about what is missing, because the gap is regularly misdiagnosed as a capacity problem.

What is usually absent is not production. The invoices are being processed and the ledger is broadly current. What is absent is somebody accountable for the numbers being right — who reconciles the balance sheet properly, who reviews the bookkeeper’s work, who decides the accrual basis, who designs the approval limits, who prepares for the audit, and who can explain any figure in the pack when the bank or the board asks.

That is a Financial Controller’s job. And most of it — this is the point that makes the gap solvable — is review rather than production. Review compresses into two days a week in a way that producing a month-end close does not.

The four options, honestly compared

Promote the bookkeeper. Cheapest, occasionally right, and frequently unfair to everyone. A capable bookkeeper without a qualification and without technical accounting experience cannot substantiate a balance sheet or handle an audit, and asking them to produces stress rather than results. Where they are genuinely capable and studying, it can work with support above them.

Lean harder on the external accountant. They will do year-end and answer questions. They will not run your close, design your controls, or tell you unprompted that your margin has drifted two points. Practices sell compliance; what is missing here is management.

Hire a full-time Financial Controller. The right answer eventually, and at £5m to £15m it is usually early. A fully loaded cost of around £108,000 for someone who has two or three days of genuine work is expensive, and the role frequently becomes hard to fill because good candidates can tell it is under-scoped.

Or buy the accountability without the headcount. A bookkeeper or bureau handling production, with a fractional Financial Controller one to three days a week owning the outcome. Total cost for a two-day arrangement plus a mid-sized bureau is typically £5,000 to £7,000 a month, against roughly £12,000 fully loaded for a permanent FC plus an internal bookkeeper.

When each is right

The honest answer depends on one thing more than any other: how many days a week the requirement genuinely fills, indefinitely.

At £3m to £8m it is typically half a day to two days — frequently as oversight of an outsourced bureau rather than direct control. At £8m to £15m, one to two days, which is the core of this market. At £15m to £25m, two to three days, and often as a bridge to a permanent appointment. Above £25m the arrangement generally stops fitting and a permanent hire is better value.

Two adjustments to that. Businesses in FCA-regulated sectors need more for the same turnover, because the regulatory obligations sit on top. And a business mid-change — integrating an acquisition, changing systems, preparing for a raise — needs more than its steady state suggests.

The failure mode worth naming: businesses that answer “two days” when the truth is “four”, start the arrangement, and extend it annually until it costs more than employment and delivers less. That is a diagnosis that was wrong at the outset and never revisited, and it is where the model gets an undeserved reputation.

What good looks like at ninety days

If you do fill the gap this way, the trajectory is reasonably predictable and worth agreeing at the outset. Diagnosis in the first fortnight, which will feel unproductive and is not. The close working to a published timetable by around day forty-five. A management pack the leadership actually reads by day sixty. Controls and documentation by day ninety.

And one test that reveals almost everything: can you ask about any number in the pack and get an answer the same day? If yes, the balance sheet is genuinely reconciled and the person understands your business. If no, you know which conversation to have.

Our guide to what a fractional FC achieves in the first ninety days covers the trajectory in detail, including what should not be expected in that window — a systems implementation, a transformed close time and deep commercial insight are all longer than a quarter.

The question to answer first

Before comparing options, answer this one: is what is missing judgement, or is it hands?

If nobody senior is accountable for the numbers, that is judgement — and it fits into part of a week. If the numbers are not being produced at all, that is hands, and adding a senior person two days a week will not fix it. You need processing capacity, possibly with oversight above it.

Businesses that get that diagnosis right tend to solve the gap for three or four years at a fraction of the cost of a permanent function. Businesses that get it wrong hire the right person into the wrong arrangement and conclude, twelve months later, that the model does not work.

A structured version of the same diagnosis is in our readiness self-assessment — twenty questions, ten minutes, and designed to tell you when the answer is “not yet”.