Fractional CFO vs full-time CFO.
A full-time CFO is the right call at a certain scale. Below it, you are paying a large fixed cost for judgment you need a few days a month. Here is the honest comparison.
| Full-time CFO | Zenith Fractional CFO | |
|---|---|---|
| All-in cost | Salary, bonus, equity, benefits: a major fixed cost | Monthly retainer sized to the engagement |
| Commitment | Permanent hire; expensive to unwind | Month to month; scale up or down |
| Time to value | 3-6 month search, then ramp-up | First monthly close cycle |
| Breadth of pattern exposure | One company at a time | Patterns from many companies, applied to yours |
| Day-to-day presence | In every meeting | Set cadence plus on-call for urgent decisions |
| Right scale | Typically well past $25M revenue or pre-IPO | Businesses that need judgment, not a full finance office |
When you should hire full-time instead
If you are running an institutional fundraise on a tight timeline, preparing an IPO or a sale process, or managing a finance team that needs daily executive leadership, hire a full-time CFO. Those are full-time jobs, and a retainer will not do them justice.
For most growing businesses, the honest sequence is: bookkeeper, then accountant, then fractional CFO, then, at real scale, the full-time hire. A good fractional engagement also makes that eventual hire better, because the finance function they inherit is already run on a professional cadence.
Common questions
At what point does a business need a full-time CFO?
Common triggers are institutional fundraising on a tight timeline, preparing for an IPO or sale process, complex multi-entity operations, or a finance team large enough to need daily executive management. Below those thresholds, most businesses need CFO-level judgment a few days a month, which is what a fractional engagement provides.
What does a fractional CFO actually do each month?
A serious engagement runs on a cadence: monthly close oversight with a variance walkthrough, a weekly cash check against a 13-week forecast, quarterly strategy and re-forecast sessions, and availability for urgent decisions like pricing, hiring, and financing.
Can a fractional CFO replace our bookkeeper or accountant?
No, and it should not. Bookkeeping records what happened and your accountant handles compliance and filings. A fractional CFO sits above both: interpreting the numbers, forecasting, and making recommendations. The roles complement each other.