A part-time finance director gives an SME the steering of a large group without the salary that goes with it. The real questions: when the model makes sense, what it actually covers, and what it costs in euros.
In short. A fractional CFO is a finance director who works inside your company on a part-time basis, a few days a month, to structure reporting, steer cash, run the closing calendar and handle banks and your accountant. For a Luxembourg SME, it means access to a scarce skill set in a market where hiring a full-time finance director costs a six-figure salary, without the workload always justifying it.
The question reads differently in Luxembourg than elsewhere. The finance job market is tight, experienced profiles are expensive and heavily courted, and many SMEs sit between two extremes: an accounting firm that keeps the books but does not steer, and a salaried CFO position out of reach. The fractional CFO occupies exactly that space.
What is a fractional CFO?
A fractional CFO (also called an external or part-time finance director) is a corporate finance professional who runs the finance function of several companies, each for a few days a month. They do not replace your bookkeeper or accounting firm: they build on those figures to produce decisions, budgets, cash forecasts, indicators and bank conversations.
What the engagement actually covers
The scope varies with the company's size and stage, but the core is almost always the same:
- Reliable monthly reporting: revenue, margin, EBITDA, cash, receivables and payables, presented to support decisions, not to fill an archive.
- Cash forecasting: a 3 to 6 month horizon, updated regularly, which prevents unplanned overdrafts and decisions taken too late.
- Budget and variance tracking: a realistic annual budget, then a monthly comparison of plan versus actual.
- Closings and annual accounts: a closing calendar that holds, coordinated with the accountant, through to filing the accounts with the RCS within Luxembourg deadlines, a topic we cover in our article on filing annual accounts in Luxembourg.
- Dialogue with financial third parties: banks, the auditor where applicable, investors or a potential buyer.
When does an SME benefit from outsourcing its finance function?
A few signals come up again and again among business owners who make the move. You discover your real profitability once a year, when the accountant delivers the balance sheet. Your cash is managed from the bank statement. A financing request calls for a forecast nobody in-house can produce. The company has passed ten employees and investment decisions are still made on gut feeling. Or a milestone is approaching: a fundraise, a succession, an acquisition.
None of these signals justifies a full-time salaried CFO. All of them justify a few days a month of experienced financial leadership.
What does a fractional CFO cost in Luxembourg?
On the French-speaking market, external finance director engagements are generally billed between €2,000 and €8,000 per month excluding VAT, depending on intensity (from 1 or 2 days a month up to a half-time role) and complexity (single company or group, financing underway, investor-grade reporting). Compare that with the full cost of a salaried finance director in Luxembourg, which comfortably exceeds €10,000 per month including charges for an experienced profile.
The right reflex is not to hunt for the lowest rate but to scope the engagement: monthly reporting plus a cash forecast does not require the same commitment as preparing a fundraise. At Advena, that scoping is done as a fixed package, defined before the engagement starts, with no hourly billing.
The point traditional offers miss: the data
A CFO, fractional or not, is only as good as the numbers they work with. If the bookkeeping arrives six weeks late, monthly reporting is fiction. And there is a second blind spot in the classic model: the finance consultant builds dashboards by hand, in a spreadsheet, from exports that have to be redone every month.
Our approach is different: tool up first, steer second. When invoicing, purchasing and the bank live in one system, with the accounts mapped to the PCN 2020 and bank statements synchronised automatically, reporting stops being a collection job and becomes an analysis job. That is the pairing we practise: the Odoo implementation and the external finance function are run by the same team, which avoids the dialogue of the deaf between "the person who builds the tool" and "the person who reads the numbers".
Illustrative case (provided as an example; it does not correspond to a real client). A twelve-person trading company generates €4M in revenue but only learns its real margin at year-end. Typical engagement: two days a month. The first quarter goes into making the data reliable (invoicing and banking in Odoo, analytic accounts per product line). From month four, the owner receives monthly reporting with margin per range and a 90-day cash forecast. The renegotiation of the credit line is built on those figures, not on last year's balance sheet.
Fractional CFO, accounting firm, salaried CFO: who does what?
| Role | What they produce | What they do not do |
|---|---|---|
| Accounting firm / bookkeeper | Bookkeeping, VAT, annual accounts, payroll | Steering, forecasting, financing strategy |
| Fractional CFO | Reporting, budget, cash, bank dialogue | Day-to-day bookkeeping |
| Salaried CFO | Both dimensions, continuously | Only cost-effective above a certain size |
The three roles are complementary. A well-organised SME keeps its accounting firm or brings bookkeeping into its ERP, and adds steering on top. None of this replaces personalised advice: the right setup depends on your situation, which is precisely what a first conversation is for.
FAQ
What is the difference between a fractional CFO and an accounting firm?
The accounting firm keeps your books and produces your legal obligations (VAT, annual accounts). The fractional CFO uses those figures to steer: reporting, budget, cash, financing. One records the past, the other prepares decisions.
How many days per month should you plan for?
Most SMEs start with 1 to 2 days a month: enough for monthly reporting, a cash forecast and a steering session. Particular periods (fundraising, succession) temporarily require more.
From what company size does it make sense?
As soon as there are decisions to steer, often around 5 to 10 employees or the first million euros of revenue. The trigger is less the size than the need: financing to secure, margin to understand, growth to structure.
Does the fractional CFO work with my current accounting firm?
Yes, that is the normal operating mode. The fractional CFO coordinates the closing calendar with the firm and builds on its entries. Where your tools allow it, they automate the collection of figures rather than redoing it by hand.
Why Advena?
- Finance and digital under one roof: the external finance function and the Odoo tooling are run by the same team.
- Reliable numbers before dashboards: we make the data solid first, then steer.
- Clear packages, no hourly billing: scope and price are defined before the engagement.
- Direct access to the founders: it is the partners who work with you, not a junior.
Going further: Filing annual accounts in Luxembourg · Odoo bank synchronisation in Luxembourg · Setting up Luxembourg accounting in Odoo · Odoo in Luxembourg: is it the right ERP for your SME?.
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