Once clean books stop being enough and you need someone to tell you what the numbers mean — pricing, cash runway, capital decisions — you’re looking for a CFO. The real question is whether you need one full-time or a fraction of one. For most companies between roughly $2M and $25M in revenue, a fractional CFO delivers the strategic horsepower without the six-figure salary commitment.
What a fractional CFO is
A fractional CFO is a senior finance executive who works with your business part-time — typically a few days a month — owning the forward-looking work: forecasting, a 13-week cash forecast, margin and pricing analysis, scenario modeling, and lender or investor readiness. You get CFO-caliber judgment on a variable-cost basis, scaled to what your business actually needs right now. If you’re still deciding whether you need this layer at all, start with do you need a fractional CFO, then come back here to weigh fractional against full-time. The ongoing engagement itself is our fractional CFO service.
When a full-time CFO is justified
A full-time CFO earns their keep when strategic finance decisions are effectively a daily job, when complexity demands consistent on-site presence, or when you’re scaling past roughly $20M or taking on institutional capital. At that point the role is genuinely full — and a dedicated executive building and leading an internal finance team is the right call. Below that threshold, a full-time CFO (commonly $180,000–$350,000+ all-in) often ends up doing controller-level work to fill the hours, which is an expensive way to keep the books.
Side by side
| Fractional CFO | Full-Time CFO | |
|---|---|---|
| Cost | ~$3K–$12K / month | $180K–$350K+ all-in |
| Time commitment | A few days a month | Full-time, embedded |
| Best revenue stage | ~$2M–$25M | ~$20M+ or institutional capital |
| Scope | Strategy on the cadence you need | Daily strategy + builds the team |
| Speed to onboard | Days to a few weeks | 3–6 month executive search |
| What it doesn’t cover | Daily on-site availability | Hard to justify if the role isn’t full |
The middle path most companies take
In practice, the efficient stack for a growing business is a bookkeeper or controller foundation with a fractional CFO layered on top — accurate books beneath, strategic judgment above — graduating to a full-time CFO only when the hours genuinely justify it. That keeps your fixed overhead low while still giving the leadership team a real finance partner. If you want to map the whole progression from recording to strategy, our guide on bookkeeper, controller, or CFO lays out each seat, and the foundation itself starts with bookkeeping and close.
The bottom line
Fractional and full-time CFOs do the same kind of thinking; the difference is dosage and cost. Buy the amount of CFO you actually need for the decisions in front of you — and let the engagement grow as the business does, rather than paying full-time for strategy you only need part-time.
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