Percentage-of-revenue vs flat-fee fractional CFO pricing
TL;DR: Most healthcare-focused fractional CFOs price on a flat monthly fee. Some firms (especially generalist or growth-focused ones) price as a percentage of revenue, often 1 to 3 percent. Flat fee aligns better with how clinics actually use CFO time, and it removes the awkward incentive misalignment of a percentage-of-revenue structure. Below: what each model costs, where each one fits, and why most operators prefer flat fee.
Option A
Flat-fee CFO
Fixed monthly engagement fee, typically $4,000 to $8,000 per month for a healthcare clinic in the $2M to $20M range. Scope is defined upfront (hours per month, deliverables, attendance at specific meetings). Cost does not change as your revenue grows.
Option B
Percentage-of-revenue CFO
Monthly fee priced as a percentage of trailing revenue, typically 1 to 3 percent. Fee scales with your business. Common at growth-focused or generalist firms; rare at healthcare-focused fractional CFO firms.
| Category | Flat-fee CFO | Percentage-of-revenue CFO |
|---|---|---|
| Annual cost on $3M revenue | $48K-$96K based on engagement scope (typically toward the lower end at this size). | $30K-$90K (1-3% of $3M). Sometimes lower at the entry tier; higher if scope expands. |
| Annual cost on $10M revenue | $48K-$96K based on engagement scope (often midpoint at this size). | $100K-$300K (1-3% of $10M). Often crosses the loaded cost of a full-time CFO. |
| Annual cost on $25M revenue | $72K-$120K. Usually structured to cap or transition to enterprise pricing. | $250K-$750K (1-3% of $25M). Almost always more expensive than hiring a full-time CFO. |
| Cost predictability | Highly predictable. Same fee every month. Easy to budget and forecast. | Variable. As revenue grows or contracts, the fee changes. Uncomfortable in a year of fast growth or a year of payer cuts. |
| Incentive alignment | CFO is paid for scope of work, not size of business. Aligns the relationship around outcomes (clean close, useful forecast, sound recommendations). | CFO fee grows with your top line. Creates an incentive to chase revenue growth even when margin or cash discipline matters more. Awkward when the right answer is to shrink unprofitable lines. |
| Behavior at scale | Cost grows roughly with scope. A CFO covering $25M does more work than one covering $3M, and pricing can flex with that. | Cost grows linearly with revenue regardless of whether scope changed. A clinic that doubles revenue without adding complexity pays double for the same work. |
| Common at | Healthcare-focused fractional CFO firms (Sorso, Maven FP, Burkland Healthcare, the Healthcare CFO). | Generalist growth-stage CFO firms (some venture-focused or growth-stage SaaS-style firms still use this model). |
| Best for | Operating clinics with predictable scope and stable growth. Owners who want clear monthly budget for finance leadership. | Very early-stage businesses where cost scales with affordability, or short-term engagements where revenue alignment is intentional. |
Flat fee is the right structure for almost every operating clinic.
The pricing question matters more than people think. A percentage-of-revenue CFO at 2 percent on a $10M clinic costs $200K per year, more than a fractional engagement of equivalent scope and approaching the loaded cost of a full-time CFO. The model also creates incentive misalignment: the CFO fee grows when the clinic grows, regardless of whether the work changed. That is awkward when the right answer is to renegotiate with a payer that costs more than it pays, shrink an unprofitable service line, or hold off on expansion. A flat-fee structure aligns the relationship around scope and outcomes. The fee changes when the work changes, and not when revenue changes for unrelated reasons. For most operating clinics, that is the right structure. The narrow exception is a very early-stage clinic where revenue alignment intentionally caps the CFO cost during ramp, but even there a tiered flat-fee structure usually beats a percentage model on long-term economics.
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