The commonest reason a fractional Financial Controller arrangement disappoints is not the person. It is the scope. Businesses buy “two days a week of FC support”, receive something less than they imagined, and conclude the model does not work. Almost always the model was fine and the engagement was never defined.
This guide is written for the buyer. It covers what a day actually buys, how retainers differ from day rates, what belongs inside the scope and what should be priced separately, and how to write an engagement both sides can hold each other to. For an overview of the role and how we place fractional FCs, see our fractional Financial Controller page.
What a day actually buys
It helps to be concrete, because expectations are often set by what a full-time FC delivers rather than by arithmetic. Two days a week is roughly eight and a half days a month, and in a typical engagement they divide something like this:
| Activity | Days per month (two-day engagement) |
|---|---|
| Close review, reconciliation oversight, sign-off | 3–4 |
| Board or management pack and commentary | 1–1.5 |
| Controls, process and documentation | 1–1.5 |
| Supervising or directing the transactional team | 1 |
| Ad-hoc analysis and commercial questions | 1 |
| Total | 8.5 |
Two implications follow. First, the close consumes roughly half of a two-day engagement in the early months, and considerably less once the process works, which is why the value of these arrangements rises over the first year. Our guide to optimising the month-end close explains where that time is usually recovered. Second, anything genuinely additional displaces something else. A systems implementation, a first audit or a funding process does not fit into eight and a half days; it has to be added and paid for.
Retainer or day rate?
| Retainer | Day rate | |
|---|---|---|
| Best for | Ongoing arrangements | Variable needs or first engagements |
| Cost predictability | High | Low |
| Encourages questions? | Yes | Less so, because the meter is running |
| Admin | Minimal | Timesheets and approval |
| Price | Often slightly below the equivalent day rate | Agreed rate per day worked |
| Flexes with need? | Reviewed periodically | Immediately |
For anything ongoing, a retainer is better for both sides. The client gets a predictable monthly cost that sits in the budget and stops hesitating before picking up the phone; the practitioner gets predictable income and an engagement measured by outcome rather than attendance. Most fractional FCs work on an annual retainer billed monthly, with additional days beyond the retainer charged at an agreed day rate.
Day rates make sense for a first engagement where neither side yet knows the shape, for genuinely variable requirements, and for bounded projects. Many arrangements start on a day rate and convert to a retainer after two or three months, which is a sensible sequence. Our guide to pricing fractional finance work looks at the same question from the practitioner’s side.
Where the practitioner works through their own limited company, IR35 status is determined by the actual working arrangement rather than the contract label; see HMRC’s off-payroll working guidance. It is also worth confirming professional membership directly with the ICAEW, ACCA or CIMA.
Four common engagement models
In practice most fractional FC arrangements fall into one of four shapes. Knowing which one you are buying makes the scope conversation much easier.
Fixed-day retainer
The standard model: named days each week, a monthly fee, and a defined core scope. It suits businesses with a steady monthly rhythm of close, reporting and review, and it is the arrangement most fractional FCs prefer because both sides can plan around it.
Retainer plus project days
A core retainer covers the ongoing cycle, with additional days agreed in advance for a specific piece of work such as a system change, a first audit or a funding round. This keeps project work from quietly eating the retainer and gives the business a clear price for the extra.
Front-loaded engagement
More days in the first three to six months to clear a backlog, rebuild reconciliations or fix the close, stepping down to a lower steady-state retainer once the process works. Agree the step-down point and the outcome that triggers it at the start.
Remote oversight
A lighter arrangement, often half a day to a day a week, in which the FC reviews and signs off work produced by a bookkeeper or bureau and is largely remote. It suits smaller businesses whose processing is outsourced, provided the FC has full system access and the authority to send work back.
What fractional FC retainers typically cost
Retainers depend on the days agreed, the region and the seniority of the individual. Typical annual ranges:
| Engagement | London | South East | Midlands and North |
|---|---|---|---|
| 1 day per week | £29k–£39k | £25k–£33k | £22k–£29k |
| 1.5 days per week | £40k–£52k | £34k–£44k | £30k–£39k |
| 2 days per week | £52k–£68k | £44k–£58k | £39k–£51k |
| 3 days per week | £74k–£95k | £63k–£81k | £56k–£72k |
For comparison, the all-in cost of employing a permanent Financial Controller in London is typically £82k–£140k, so a two-day fractional FC costs roughly half of a permanent hire. Full ranges and the factors that move them are in our fractional FC rates guide and the interim finance rate card.
What belongs inside the scope
A workable core scope for a two-day engagement, worth adapting rather than copying:
- Ownership of the month-end close: timetable, review, sign-off, and accountability for the numbers being right.
- Balance sheet reconciliation: the index, the review, and clearing the backlog.
- The management or board pack, including commentary that explains variances by cause.
- Cash flow reporting and a rolling forward view.
- The control framework: approval limits, segregation of duties, system access, and closing the obvious gaps.
- Supervision of transactional staff or the outsourced bureau.
- The audit relationship and year-end preparation.
- Documentation: the process written down so it exists outside the FC’s head.
That last item is easy to leave out and should not be. In a fractional arrangement the FC is absent most of the week, so undocumented process is a weekly problem rather than an annual one. Our guide to designing financial controls sets out what a proportionate framework looks like for a growing business.
What to price separately
Four categories should sit outside the retainer, because absorbing them damages both the economics and the delivery.
Systems implementation or migration. A project with its own timetable, scoped and priced as one, typically at a project day rate above the retainer equivalent. See our guide to the Financial Controller’s role in an ERP or finance system change.
Transaction support. Fundraising, due diligence or an acquisition. This work is intense, unpredictable and higher-value, and it will consume a full week when it lands.
A first audit or a remediation. Bounded, deadline-driven and considerably more than the ongoing cycle absorbs. Our guide to preparing for your first audit explains why.
Anything below the level. If the business needs bookkeeping or transaction processing, that is a bookkeeper or a bureau, the distinction our guide to fractional FC versus outsourced accounting covers.
Scoping a fractional FC engagement? — 0204 553 8893
Our recruitment team can help you set the days, scope and retainer before you go to market. We respond the same working day and typically present fractional candidates within days.
Structuring it so it works
Five practical points, all of them the client’s responsibility rather than the practitioner’s.
Fix the days. Floating availability produces an FC who is never quite present and a client who expects them constantly. Named days, protected.
Agree what happens between visits. A reasonable amount of email and a call if something urgent arises is normal and should be stated. Beyond that it is additional, and being explicit early prevents the slow expansion that erodes most arrangements.
Give authority on day one. System access, sign-off limits, and the ability to direct the transactional team and send work back to the bureau. This is the single largest factor in whether the engagement delivers.
Set a notice period both ways. One month is common, and it protects both sides.
Define what success looks like at six months. Three or four specific outcomes: a close by working day eight, a reconciled balance sheet, a board pack the leadership reads, less of your own time on finance. Our guide to what a fractional FC achieves in 90 days sets out a realistic trajectory.
How much do you actually need?
A rough guide by business size, assuming a bookkeeper or bureau handles processing:
| Revenue | Typical days per week | Notes |
|---|---|---|
| £2m–£5m | 0.5–1 | Often oversight of an outsourced bureau |
| £5m–£12m | 1–2 | The core market for the model |
| £12m–£25m | 2–3 | Often a bridge to a permanent hire |
| £25m+ | 3+ or permanent | Usually beyond what fractional serves well |
Two adjustments. Regulated firms need more for the same turnover, because the obligations are additional; see fractional FC for FCA-regulated firms. And a business mid-change, integrating an acquisition, changing systems or preparing for a raise, needs more than its steady state suggests.
If the honest answer is four or five days indefinitely, that is a permanent hire, and our fractional FC readiness assessment works through the question. If the need is really for board-level strategy and investor relations rather than control, read when a business needs a fractional CFO.
Frequently asked questions
How much does a one-day-a-week fractional FC cost?
Typically £29k–£39k a year in London, £25k–£33k in the South East and £22k–£29k in the Midlands and North, usually billed monthly.
Should we start on a retainer or a day rate?
If the shape of the work is unclear, start on a day rate for two or three months and convert to a retainer once the days needed are known. For a clearly ongoing requirement, start on a retainer.
What notice period is normal?
One month on both sides is common. It gives the business time to arrange a handover and protects the FC from an abrupt end to a retainer.
Adrian Lawrence FCA — Founder, Accountancy Capital
Fellow of the ICAEW | Chartered Accountant holding an ICAEW practising certificate | Part of FD Capital Group
Adrian is a former listed-company Finance Director with a BSc from Queen Mary College, University of London. Accountancy Capital, one of the five specialist firms of FD Capital Group, places fractional, interim and permanent Financial Controllers across the UK. The engagements that last are the ones where the scope, the days and three six-month outcomes are written down before the FC starts.
Related Pages and Resources
By Sector
SaaS, PE-backed and regulated firms.
Making It Work
Authority, rhythm and handover.
→ A Fractional FC’s First 90 Days
Talk to us about a fractional FC — 0204 553 8893
Call us or email recruitment@accountancycapital.co.uk. Offices in London (167–169 Great Portland Street, W1W 5PF) and the West Midlands (Watling Court, Orbital Plaza, Cannock WS11 0EL). Fees are agreed in writing before a search starts.