When does a startup actually need a CFO?

Founders ask this two ways. The first is genuine — they're not sure if they're at the stage. The second is reassurance-seeking — they already know they need help and want permission to spend on it. Both deserve a straight answer.

Here are the triggers, in rough order of urgency.

The five “you need it” signals

1. You spent more than five hours last month inside your books or QuickBooks. Not reviewing — actually inside, categorizing, fixing, reconciling. That's hours that should be going to product and customers.
2. You're raising in the next six months. Investors will ask for a financial model, historical financials, a unit economics view, and a use of proceeds. Doing this in the two weeks before a pitch is when fundraises die quietly.
3. You missed budget on something for two consecutive months and you don't know why. This is the signal that your operating cadence isn't wired to your numbers. The mistake compounds — every month you don't know why, you keep making the same call.
4. Revenue is past $1M but you don't have a real margin number per product or segment. You're running on gut. Gut at $1M is fine; gut at $5M is expensive.
5. You're considering a major financial move — debt, an acquisition, an equity raise, a pivot. This is the “I'd like another set of eyes” moment. A fractional CFO is cheap insurance.

The two “not yet” signals

There are also two reasons to delay.

1. You're pre-revenue or sub-$500K ARR with a clean cap table and good bookkeeping. A CFO at this stage will create a fancier version of the spreadsheet you already have. Hire when there's actually leverage.
2. You haven't done the cheap things first. A good bookkeeper, a clean chart of accounts, a working cash dashboard. If you don't have these, a CFO will spend the first three months installing them and you'll wonder where the strategic value is.

What “fractional” should actually mean

A fractional CFO is not a full-time CFO who happens to give you eight hours a week. It's a different model entirely. Done right, it's:

• A weekly or biweekly operating cadence (45–60 min)
• Live financial reporting maintained between sessions
• Strategic counsel on the calls that matter — pricing, hiring, capital
• Access to the analytical work product — forecast, model, board deck

Done wrong, it's a senior person showing up to take notes on what you already know, in a Slack channel that goes quiet between Tuesdays.

If you're shopping, ask the prospective fractional what their deliverables are between meetings. If the answer is “I'll be available for questions,” walk.