Fractional vs. full-time CFO: which does your business actually need?

Most owners ask this question about a year too late — usually right after a cash surprise or a big decision they couldn't model. So let's get ahead of it. Somewhere between "my bookkeeper handles it" and "we have a finance department," every growing business hits a wall: the decisions get bigger than the numbers can answer. The real question isn't whether you need CFO-level thinking — it's whether you need it full-time, or fractionally.

What a CFO actually does (that a bookkeeper doesn't)

First, clear up the roles, because they get blurred constantly:

• A bookkeeper records what happened — clean, accurate transactions.
• An accountant keeps you compliant — taxes, filings, year-end.
• A CFO looks forward — forecasting cash, protecting margins, modelling decisions, raising capital, and turning your numbers into strategy.

If your finance pain is "the books are messy," you need bookkeeping. If it's "I can't see far enough ahead to make confident decisions," that's a CFO problem.

The cost gap is bigger than the salary

A full-time CFO in many markets runs $200,000–$300,000+ in base salary, before bonus, equity, benefits, payroll taxes and recruiting fees — call it $280k+ all-in. That's a rational investment when the role is full — but for most businesses under roughly $20M in revenue, it isn't full. You'd be paying executive money for a seat that's busy two or three days a month.

A fractional CFO gives you the same seniority for the slice of time you actually need — typically a fraction of that cost, with no long-term employment commitment. You're buying the expertise, not the chair.

Where each one fits by stage

Roughly, and with plenty of exceptions:

• Under ~$1M revenue: usually a solid bookkeeper plus occasional advisory. CFO-level help in targeted bursts (a raise, a pricing overhaul).
• ~$1M–$20M: the fractional sweet spot. You face real CFO decisions — cash, margins, hiring, funding — but not 40 hours of them a week.
• $20M+ and scaling fast: a full-time CFO leading a team starts to pay for itself. A fractional CFO can bridge you there and even help you hire your first full-timer.

The honest answer for most owners

Start fractional. It's lower-risk, faster to value, and you keep optionality. A good fractional CFO will tell you — candidly — when you've outgrown the model and it's time to bring the role in-house. If they don't, they're optimising for their retainer, not your business.