Fractional CFO in Australia: when it works and what it costs

A fractional CFO costs $1k to $3k a month at seed stage for five to ten hours a month, rising to $5k to $10k a month for five to ten hours a week in a hyper-growth business. Used well it buys eighteen to twenty-four months.

What it costs

Cost scales with hours, and most founders need fewer than they expect at the start. A typical seed-stage business needs five to ten hours a month, which runs $1k to $3k a month. A hyper-growth or operationally complex business needs five to ten hours a week, which runs $5k to $10k a month.^[1] Set against a full-time CFO at $275k to $325k base plus equity at late Series A, the arithmetic is the whole reason the model exists.^[2] Pairing a fractional CFO with a strong Financial Controller or Head of Finance who runs the day to day can save a business $50k to $100k against hiring the full-time CFO too early, a pairing I walked through as a guest on the Behind The Story podcast.

When it is the right call

The clearest case is the gap stage: more complexity than a controller should carry, but not enough to keep a full-time CFO busy or justify the salary. A fractional arrangement gives you senior judgement through a raise, a systems change or a board that suddenly wants a forward view, and done well it delivers eighteen to twenty-four months of proper financial visibility before you need a full-timer.^[3] At late Series A, with $15 million or more raised, the shape I recommend most often is a strong Head of Finance running the function, with a fractional CFO layered on for the specific requirements, usually the raise.^[10]

It is genuinely the default bridge rather than a fringe option. In our Q2 2026 State of the Market survey, 48% of businesses were using interim or fractional cover while continuing a permanent search, keeping the function running rather than settling for the wrong permanent hire under time pressure.^[4] The raise itself is a common trigger. VCs ideally want a finance person in place before Series A to handle the data room and compliance, but more often than not the founder brings in a fractional CFO for the capital raising project with a mandate to hire the permanent person once the round lands.^[8]

Timing also depends on what you are building. A single-product SaaS business often doesn't need a full-time CFO until Series C, running on a more junior Finance Manager or Financial Controller with fractional CFO support for a long time, while a complex deep tech or fintech business needs senior finance sooner.^[5] Complexity drives the need more than headcount does.

If you are unsure whether the role is a full-time CFO yet, I set out the signals separately.

What you give up

A fractional CFO is not in the room when the pricing conversation happens, not close enough to the team to notice a problem forming, and not accountable the way an employee is. For a business where finance is mostly reporting and periodic decisions that is a fair trade. Where finance needs to shape decisions as they are made, the gap gets expensive.

There is also a scope-drift risk worth naming upfront. Part time roles rarely stay part time, and the people in them routinely end up doing far more hours than agreed. Review the engagement honestly each quarter, because a consistent overrun is not goodwill, it is the business telling you the role has become full time.

Where it breaks

There is a reasonably clear ceiling. For businesses reaching $20m ARR and beyond, a full-time CFO becomes effectively mandatory, because fractional arrangements typically break down at that stage.^[6] The role stops being a set of discrete questions and becomes continuous: a board wanting a forward view every month, a team to lead, and decisions that cannot wait for the next scheduled session.

The lifespan is more predictable than founders expect. Most fractional finance relationships I see last 18 to 24 months before the business outgrows them. The better fractional firms know it too: when the engagement reaches its ceiling they refer the business on for the full-time hire rather than clinging to the retainer, which is exactly the behaviour to look for when you choose one.

Plan the permanent hire before the bridge strains rather than after. The best CFOs want to start nine to twelve months before a raise, not three weeks before the pitch, because it takes three to six months to land, build trust and earn the right to lead the process.^[7] Starting the search once the fractional arrangement has already failed means running it under exactly the pressure that produces a bad hire.

I set out how a retained finance search runs and the realistic timeline from brief to start date.

Choosing one

You are choosing between an individual and a firm. A solo operator gives you one relationship and consistent judgement with limited capacity and no cover. A firm gives depth and continuity at a higher rate, with the risk that the person in your business changes. At the gap stage most founders are better served by the solo operator, because the value is judgement rather than throughput.

Ask what happens when they are unavailable, what the engagement explicitly does not cover, and what the exit looks like. The good ones answer all three without hesitating.

Vet harder than you think you need to. The fractional market has become genuinely saturated over the past couple of years as finance professionals chase more control over their careers, and the volume of providers says nothing about quality. I make a point of meeting every fractional operator I refer before putting their name forward, and founders should apply the same discipline: ask for the current client list, the stage those clients are at, and a founder reference you can actually call.^[9]

Common questions