When to hire a CFO: the signals and which kind of help fits

When to hire a CFO comes down to one test: hire CFO-level help when an upcoming decision depends on numbers that nobody inside the company owns, such as a raise, a lender, a hiring plan or a sale. The right first hire is not always a CFO, though; if the books are unreliable, a bookkeeper or controller comes first, and a full-time CFO only makes sense once the work fills the week.

That makes the question really two questions: is it time, and which kind of help? The guide to what a fractional CFO is covers the role itself. This post is about the decision.

The decision path

Most growing companies move through three steps, and the mistake is usually skipping one.

1. Bookkeeper or controller first. If the month does not close accurately within a few weeks of month end, any forecast built on top of it will be wrong. Fix the close before adding a CFO, or the CFO's first months go to cleanup.
2. Fractional CFO next. Once the books are reliable and decisions start depending on a forward view, a part-time CFO builds the forecast, reporting and board rhythm without the cost of a full-time executive.
3. Full-time CFO last. When the finance team needs daily leadership, the company runs several entities, or a public offering is ahead, the seat needs one person every day. A public company's principal financial officer must certify each quarterly and annual report filed with the SEC, which is not a part-time job.

The steps overlap. A fractional CFO works alongside the controller, and a full-time CFO often inherits the model and reporting a fractional CFO built.

Signals and who to bring in

The trigger is usually an event, not a size. Each signal points to a different kind of help.

One signal can often be handled as a project. Two or more at the same time usually means ongoing CFO-level help. The lender row deserves extra attention, because a covenant breach is discovered in hindsight unless someone forecasts it; the guide to venture debt explains how those terms work.

A worked example: the hiring plan signal

The hiring plan row is where the cost of waiting shows up most clearly. Suppose a company has $4,200K in cash and a net burn of $300K a month, and leadership approves a plan that adds $120K a month of new payroll cost.

Illustrative figures, not client data. Runway is cash divided by monthly net burn: 4,200 / 300 = 14; 4,200 / 420 = 10.

The plan takes four months of runway, which moves the next fundraise four months earlier. That may still be the right call. The point is that the founder should see the 10 before the offers go out, not after. Building that view and keeping it current is the core of what the fractional CFO work for startups looks like at each stage.

When a full-time CFO is the answer

A full-time CFO makes sense when the signals stop being events and become the steady state. The usual markers are a finance team of several people who need a manager, more than one legal entity with intercompany activity, lenders and investors asking for something every week, or a public offering on the roadmap.

Before that point, a full-time hire tends to spend much of the week on work a part-time arrangement would cover. Many companies use a fractional CFO to bridge the gap and then to scope, recruit and hand over to the full-time CFO.

Three questions to settle before hiring

• What decision is coming in the next two quarters? Name it: the raise, the covenant test, the hiring plan, the sale. If none comes to mind, the company may need a better close rather than a CFO.
• Do the books close accurately and on time? If not, the controller hire comes first, whatever else is on the list.
• How much of a week does the work fill? Count the recurring work: forecast refresh, monthly reporting, board package, lender reporting. If it fits in part of a week, a fractional CFO covers it; if it needs every day, the case for a full-time hire is real.