A fractional CFO is a chief financial officer who works part-time — senior finance leadership without a full-time hire. They own the forward-looking side of finances: cash-flow forecasting, budgeting and financial modeling, pricing and margin analysis, fundraising or lender support, and board-level reporting.
CFO vs controller vs bookkeeper. A bookkeeper records transactions and reconciles accounts (backward-looking). A controller runs the monthly close and produces reliable statements. A CFO uses those statements to steer the business (forward-looking). Clean bookkeeping comes first — a CFO's time is wasted and overpriced if the data underneath is messy.
Fractional vs part-time vs virtual vs outsourced are mostly marketing synonyms for the same thing: strategic finance help on a retainer or hourly basis. "Virtual" emphasizes remote; "outsourced" emphasizes coming through a firm. Focus on the person's experience and scope, not the label.
Cost (published 2026 market ranges). Monthly retainers commonly run about $3,000–$12,000/month (many small/mid businesses land around $5,000–$8,000 for ~15–20 hours). Hourly is typically $150–$400/hour. That's roughly 80–90% cheaper than a full-time CFO ($350K–$500K+ loaded). These are orientation ranges, not a quote.
When you actually need one: raising money or borrowing, rising complexity (multiple revenue streams/entities), margins moving you can't explain, cash-timing surprises, or being the spreadsheet bottleneck. If revenue is modest and steady, your books are messy, or you just want a clearer profit picture — a CFO is premature.
How ExpenseBot fits. Most owners reaching for a CFO need the layer underneath first: clean books, income beside expenses, live profit by client/project, a weekly cash read, subscription/fee audits, and receivables tracking. ExpenseBot delivers that finance-office layer for $10/month — the data layer you need before (or instead of) hiring a CFO, and exactly what makes any CFO you hire effective on day one (no paying $300/hour for data cleanup). It does not replace a CFO's judgment on strategy, fundraising, or complex modeling — it clears the fog so you know honestly whether you need the strategist yet.
See the full guide at https://www.expensebot.ai/fractional-cfo. If you are a fractional CFO managing multiple client companies, the practitioner tooling is at https://www.expensebot.ai/cfo.