How to hire a fractional CFO

6 min readUpdated September 2026
Short answer

Hiring a fractional CFO takes days, not months. Start with the decision you cannot make today, then test candidates on that specific problem rather than on credentials. Ask who does the actual work, what lands in the first 30 days, and what sits outside scope. Expect a monthly retainer priced by complexity, month to month, with no lock-in – anyone asking for a long tie-in before proving value is a red flag.

Time to start
Days, not the three to six months of a hire
Selection test
One real decision, not a CV review
Commitment
Month to month, no lock-in
First 30 days
A reporting pack you can actually read
Nikolajs Petrovics, Founder & CFO, John Galt Finance
Written and reviewed by
Founder & CFO, John Galt Finance

15+ years in finance: 100+ financial models built, €40m+ raised for clients, Forbes contributor and lecturer.

LinkedIn Reviewed September 2026

Most founders approach this like a recruitment process, which is why it takes far longer than it needs to. A fractional engagement is not a hire. You are buying a scoped outcome from a senior operator, and you can stop it at the end of any month.

Step 1: name the decision, not the role

Write down the decision you cannot make with today's numbers. "Can we afford two more hires", "which channel actually makes money", "will we run out of cash in Q1", "are we ready to raise". That sentence is your brief. It also tells you whether you need reporting and controls first or commercial and funding work first.

Step 2: the five questions worth asking

  1. What would you do in the first 30 days, given our situation? A specific answer means they have done this before. A generic one means you are the first.
  2. Who does the work? The senior person on the call, or an analyst you never meet? Both models exist; you should know which you are buying.
  3. What is outside scope? Bookkeeping, tax filing and payroll usually are. Clarity here prevents the most common disappointment.
  4. Show me a real management pack. Anonymised is fine. If they cannot show you the artefact, you are buying advice, not deliverables.
  5. What is the exit? Month-to-month, no notice games, and a clean handover if you later hire in-house.

Step 3: red flags

  • A fixed price quoted before anyone has looked at your books
  • A twelve-month contract required up front
  • Guaranteed outcomes: growth, valuation, funding
  • Reluctance to talk to your existing accountant
  • One person claiming to own compliance, bookkeeping and strategy at once

Step 4: how pricing works

Expect a monthly retainer, priced by complexity rather than revenue: number of entities, sales channels, quality of the bookkeeping, reporting cadence and whether you are raising. A full-time CFO in Europe costs €120K+ per year plus taxes and bonus, so a fractional retainer buys the same seniority for the days you actually need it. See the detail in how much a fractional CFO costs or run the numbers in the CFO cost calculator.

Step 5: what the first 30 days should produce

A reporting pack you can read without a translator: P&L, cash flow and balance sheet, a rolling 13-week cash forecast, a first cut of contribution margin, and a written list of what is broken and in what order it gets fixed. If month one is all discovery and no artefact, ask why.

How it works with us

The 30-minute diagnostic call is the whole selection process. We look at your reporting, your entity structure and the decision you are trying to make, then propose the smallest engagement that answers it. If a one-off project is the honest answer instead of a retainer, we say that.

Related questions

How long does it take to get started?

Days. A diagnostic call, a scoped proposal, then work starts – there is no recruitment cycle.

How many days a month should we expect?

Enough to hold the cadence: usually a few days a month concentrated around month end and the weekly cash update, plus access between calls.

Can we start small and expand?

Yes, and it is usually the right order. Many engagements begin with a diagnostic or a single reporting build before moving to a retainer.

What if we later want a full-time CFO?

Then we help you write the brief, interview candidates and hand over. That is a good outcome, not a lost client.

Sources & methodology

Written from our own CFO engagements: how we scope retainers, what we deliver in the first 30 days, and what founders actually ask on diagnostic calls. Third-party studies are cited only when we can link them.

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