The two extremes most SMBs live in.
On one end: a single bookkeeper handling everything. Works fine until about $2M to $5M revenue, after which the role gets crushed by complexity. On the other end: a full CFO at $250K+ all-in annual cost, often hired before the business is ready to use them. The middle ground — a senior controller or finance manager — is what most SMBs actually need first, and most underuse this role.
The progression that works for most SMBs: bookkeeper (up to $2M), bookkeeper plus fractional accountant or CPA (around $2M to $8M), full-time finance manager / controller ($8M to $20M), CFO ($20M+). Skipping stages causes either bottlenecks or expensive idle capacity.
When a bookkeeper is enough.
Up to about $2M revenue with a single legal entity, mostly cash or short-credit business, and a single product line, a competent bookkeeper plus modern tooling is enough. The owner makes capital decisions, the bookkeeper keeps the books and runs payroll, and a part-time CPA / chartered accountant handles tax filings.
Signs you are still in this stage: you can answer "what is our cash position?" without making a phone call, you do not have foreign currency exposure, you have not raised external capital, and your largest customer is less than 25 percent of revenue. If all of these are true, do not hire upward yet. Add tooling instead.
When you need a finance manager.
The signals: revenue between $8M and $20M, more than one branch or one legal entity, foreign currency exposure (imports, exports, cross-border SaaS billing), regular working capital management decisions, or a customer concentration risk that requires active credit management. At this stage you need someone who can build budgets, run a 13-week cash forecast, manage AR/AP actively, and lead the close.
Cost: $90,000 to $160,000 annual salary for a competent finance manager (varies by city — London, New York, San Francisco trend higher; Austin, Manchester, Berlin trend lower). Scope: owns the close, owns AR collections strategy, owns vendor terms, owns the budget process, supervises the bookkeeper. Reports to the owner. Does not own strategic finance decisions, that is still the owner.
- Revenue $8M-20M
- Multi-branch or multi-entity
- Foreign currency or import/export exposure
- Customer concentration above 25 percent of revenue
- Need for budgets, forecasts, and active working capital management
When you need a CFO.
The signals: revenue above $20M, plans to raise capital, plans to acquire or be acquired, board-level reporting requirements, multiple legal entities with intercompany flows, treasury function (multiple banks, FX hedging, debt management), or expansion into new markets. At this stage the owner cannot personally hold all the strategic financial threads.
Cost: $200,000 to $400,000 base, plus equity, for a real CFO (higher in major US/UK metros for ex-Big-4 candidates). Scope: strategic financial planning, capital structure, M&A, investor relations, board reporting, treasury, and oversight of the entire finance function. The CFO does not do the close; the finance manager does. The CFO uses the close to make decisions.
The in-between: fractional CFO.
Between full-time finance manager and full-time CFO, many SMBs find the right fit is a fractional CFO — a senior finance person 4 to 8 days a month at $6,000 to $15,000 monthly retainer. They handle strategic finance, cash forecasting, investor prep, and major decisions. The finance manager handles operations.
This is often the right move at $15M to $30M revenue, especially when planning a fundraise or a major expansion. The fractional CFO brings senior judgement without the full-time cost. After 12 to 24 months, the relationship either converts to full-time or transitions to a different fractional resource.
How tooling changes the threshold.
Modern AI-assisted accounting like Nonari shifts the thresholds upward. A bookkeeper with strong tooling can handle a $5M business that would have required a finance manager 5 years ago. A finance manager with strong tooling can run a $20M business with one bookkeeper rather than three. The tooling extends the range each role covers.
But tooling does not replace judgement. A CFO is hired for judgement on capital structure, investor relations, M&A, and strategic finance. Those decisions do not automate. Tooling makes the people you have more effective; it does not eliminate the need for senior people when the business is genuinely complex.
Worked example: a 5-year journey.
A Berlin-based SaaS company. Year 1, $2M ARR, single bookkeeper plus quarterly external accountant. Year 2, $4.5M ARR, added Nonari and kept the bookkeeper, no new hires. Year 3, $9M ARR, hired a finance manager (CPA, 8 years experience) at $115K. Year 4, $18M ARR, added a fractional CFO at $10K monthly to support a Series B raise. Year 5, $32M ARR post-raise, converted the fractional CFO to full-time at $260K base plus equity.
The progression cost the business about $1.4M cumulative finance team cost over 5 years. The alternative — hiring a CFO at year 2 — would have cost $2.5M+ and the role would have been underused. The other alternative — hiring nobody until year 5 crisis — would have cost the business several missed working-capital decisions and probably the raise. Right resource, right time.