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 instead of a flat fee. 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 a flat fee usually suits a clinic better.
Option A
Flat-fee CFO
Fixed monthly engagement fee: most fractional CFO engagements are quoted at $3,000 to $10,000 a month, according to fractional CFO firm The Good CFO, and Sorso's starts at $4,000. 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. The examples on this page use 1 to 3 percent to illustrate how the math plays out, since no association publishes a standard rate. 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 | $36K-$120K a year for most engagements, set by scope rather than revenue; Sorso's starts at $48K. | $30K-$90K (1-3% of $3M). Sometimes lower at the entry tier; higher if scope expands. |
| Annual cost on $10M revenue | The same scope-based fee. More locations and entities mean more work, so the fee moves with scope, not revenue. | At the illustrative 1 to 3 percent, $100K-$300K a year on $10M of revenue. At the top of that range it passes a full-time CFO's cost with benefits (about $242,000, Sorso estimate). |
| Annual cost on $25M revenue | Still priced on scope, so the fee only rises if the work does. | At the illustrative 1 to 3 percent, $250K-$750K a year on $25M of revenue. 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. At an illustrative 2 percent, a percentage-of-revenue CFO on a $10M clinic costs $200K a year: more than most flat fractional engagements, which The Good CFO puts at $3,000 to $10,000 a month, and close to a full-time CFO with benefits (about $242,000, Sorso estimate). 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.
Frequently Asked Questions
Why do some firms price CFO services as a percentage of revenue?+
Two reasons. First, in the early-stage and venture-backed world, percentage pricing was historically used as a proxy for value and as a way to align cost with scale. Second, it is administratively simple: one rate, one calculation, no scope discussion. The downside is that it does not match how CFO work actually scales. Doubling revenue does not mean doubling the work.
Is percentage-of-revenue ever the better choice for a clinic?+
Rarely. The closest fit is a very early-stage clinic where the owner explicitly wants the CFO cost to grow with the business and shrink if the business shrinks. Even there, a tiered flat-fee structure usually accomplishes the same goal at lower long-term cost. Once a clinic crosses $5M in revenue, percentage pricing almost always becomes more expensive than equivalent flat-fee scope.
How is Sorso priced?+
Flat fee, by tier. Accounting starts at $2,000/mo. Fractional CFO starts at $4,000/mo. Multi-location and enterprise scope is custom. The fee is tied to scope of work, not your top-line revenue, so growing revenue does not automatically mean growing fees.
What about hourly billing for fractional CFO work?+
Hourly is rare in healthcare-focused fractional CFO engagements because it creates incentive misalignment in the other direction (the CFO benefits from doing more hours, not better work). Most healthcare-focused firms use a flat monthly fee with defined scope and reserve hourly billing for one-off projects like transaction prep or due diligence support.
Can a percentage-of-revenue contract be capped?+
Yes, and a savvy buyer asks for it. Common caps: maximum monthly fee, maximum annual fee, or a step-function (1.5% up to $5M, 1% on incremental, capped at $X). If you are negotiating a percentage-of-revenue arrangement, walk in with a cap proposal already drafted; firms expect it.
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Founder of Sorso and a CFA charterholder. Before Sorso, Stan spent 19 years in corporate finance at institutions including UniCredit and Société Générale — managing a $450M loan portfolio and making senior partner at a major mezzanine lender by 29 — then built a fractional CFO firm exclusively for outpatient healthcare clinics.