Your bookkeeper keeps the ledger right, your accountant files the return, and you still don't know whether to hire, whether to raise prices, or whether the line of credit will cover payroll in March. That gap is what a fractional CFO fills.
A fractional CFO is an experienced finance leader — often a former controller, VP of finance, or division CFO — who works with your company 5–20 hours a month for a flat retainer, typically $2,000–$5,000 for a small business, sometimes more for a business over $5M in revenue or in a transaction. You get the planning, modeling, and reporting that a full-time CFO provides, without the $150,000–$250,000 salary and equity.
What $2,000–$5,000 Actually Buys
The retainer is not just "advice." A competent fractional CFO delivers a repeating cadence of work:
Monthly close oversight: They don't do the bookkeeping, but they review the close, ensure accruals and deferrals are correct, and sign off that the P&L and balance sheet are ready for decisions.
13-week cash forecast: Updated every week or every two weeks, tied to the receivables and payables ledgers, with a variance log that explains why last week was off and what changes this week.
Operating model: A driver-based model that links revenue, headcount, and capacity. For a service firm, that is utilization, bill rate, and delivery backlog. For a product firm, it is units, price, and gross margin by value stream.
Board or lender package: A one-page KPI dashboard, a P&L vs. budget and vs. forecast, a balance sheet with cash and working capital, and a narrative that says what happened, why, and what you will do.
Decision support: Pricing a new offer, evaluating a lease vs. buy, sizing a hire, or stress-testing a contract. The CFO brings the model and the challenge: "If you hire two now and sales slips 15%, covenant coverage goes to 1.08×."
At the low end ($2,000–$3,000), expect a single CFO, 5–8 hours, focused on forecast and monthly review. At $3,500–$5,000, expect 10–15 hours, a more detailed model, and quarterly strategic work like a pricing or cost study.
When You Actually Need One
Hire when the cost of not having a CFO exceeds the retainer. Signals:
- Cash is tight but revenue is growing. You are profitable on paper and anxious about payroll. That is a working capital problem, not a sales problem.
- You are negotiating with a bank, investor, or buyer. The other side will bring a model and a diligence list; you need your own.
- You have managers who need budgets and hold them. A bookkeeper can report actuals; a CFO can own the budget and the monthly variance conversation.
- You are crossing $1M–$3M in revenue or 10 employees. Complexity outgrows the owner's spreadsheet, especially with inventory, projects, or multiple locations.
Don't hire when your books are not closed monthly or your bank is not reconciled — the CFO will spend the retainer fixing bookkeeping, which is a $75/hour job on a $250/hour rate. Fix the close first.
Solo CFO vs. Firm
Solo fractional CFO: One person, deep relationship, faster trust. Best when you want continuity and the business is under $5M with one value stream. Risk is coverage: if they are sick or overloaded, you wait.
CFO firm or agency: A team — a CFO plus a controller and an analyst — that can cover more hours and bring bench depth. Best when you need a faster close, heavy modeling, or transaction support. You may get a less personal relationship and a higher retainer.
Ask each:
- Who is my day-to-day CFO, what is their operating experience in my industry, and who else touches my file?
- What deliverables are in the retainer, and what is out-of-scope (fundraising, M&A, system implementation)?
- How do you handle the handoff with my bookkeeper and CPA? Will you talk weekly?
- What KPI set do you recommend for my business, and why those ten over the alternatives?
How to Get Value in the First 90 Days
Month one: Diagnose. The CFO should produce a 90-day map: close quality, cash drivers, margin by product or service line, and the one metric that matters most (often cash conversion cycle, gross margin per labor hour, or revenue per employee). You should receive a 13-week forecast by the end of week four.
Month two: Model. A driver-based forecast that lets you test decisions: "If we raise price 4% and lose 3% of volume, what happens to profit and cash?" That model lives in a tool you can open, not a PDF only the CFO can change.
Month three: Operate. Monthly variance meetings with owners and managers, a board packet if you have a board, and a decision log that tracks the forecast's accuracy and the action taken when it was wrong.
If by day 90 you don't have a forecast, a dashboard, and a decision that was made because of the analysis, the engagement is not working.
Red Flags Before You Sign
- No references from businesses your size, or only from startups that never reached profitability
- A fixed deliverable list with no weekly cadence — finance is a habit, not a project
- Insistence on replacing your bookkeeper or CPA immediately without diagnosing the current close
- A retainer that bundles bookkeeping and CFO at one price without separating the roles and rates
Keep Your Finances Organized From Day One
A fractional CFO can only be as good as the ledger underneath. The businesses that get the most from $3,000 a month are the ones whose books are already reconciled, version-controlled, and ready for a forecast on day one.
Beancount.io gives a CFO that foundation — a plain-text, auditable ledger that a model can read and a board can trust. Get started for free and make your first CFO conversation about strategy, not about finding the missing receipts.