A founder called me last month and said, “I think I need a controller.” She didn’t. Her books were clean and her accountant was fine. What she didn’t have was someone who could look at her cash flow statement and say, “You’re about to hit a working capital wall in Q3.” That’s a CFO.
Earlier this summer, a different founder offered me a full-time CFO role. Series A SaaS, $3M ARR, a board pushing for a “real CFO.” I said no, and told her not to hire anyone else for it either. She had a good bookkeeper but no GAAP financials, loose revenue recognition, stock-based comp missing from the books and a cash forecast someone updated when they remembered.
A $250K full-time CFO walking into that spends six months cleaning up books a controller should have built, gets bored and leaves in eighteen months.
Two founders, opposite instincts, same mistake: hiring for the job title instead of the function.
“We need a CFO” is usually a symptom
When a founder tells me they need a CFO, it almost always means one of two things:
- The board wants someone to call. Investors want a finance owner who can answer their questions without going through the CEO.
- The founder wants someone to hand the spreadsheet to. They’re tired of being the person updating the model at midnight.
Both are real problems. Neither requires a full-time hire at $3M in revenue.
What each role actually does
Most of the confusion comes from treating three different jobs as one.
Bookkeeper. Records transactions, categorizes spend, keeps the ledger current. The output is accurate data.
Controller. Owns the close. Reconciles every account, books accruals and prepaids, recognizes revenue correctly, and produces financial statements you can rely on every month. The output is GAAP books someone could audit.
CFO. Owns what the numbers mean and what to do about them: the forecast, cash planning, pricing and hiring decisions, board reporting, fundraising and, eventually, a sale. The output is decisions.
A company with no controller and a full-time CFO gets an expensive executive doing controller work. A company with a great controller and no CFO gets accurate statements nobody turns into decisions. You need both functions. You rarely need both as full-time hires early on.
The sequence I walk founders through
| Stage | What you need |
|---|---|
| Under $2M revenue | A bookkeeper plus a fractional CFO |
| $2M to $10M | Add a controller to own the close; keep the fractional CFO on strategy |
| $10M to $25M | Depends on complexity: entities, debt, a raise or sale ahead |
| $25M+ | A full-time finance leader, then build the team below |
Complexity matters as much as revenue. Multiple entities, debt with covenants, an upcoming raise, or a sale on the horizon can pull the full-time decision earlier. A simple single-entity business can stay fractional longer.
The cost math
At $3M ARR, a controller plus a fractional CFO together usually cost about half of one full-time CFO, before you count benefits, equity and recruiting. More importantly, each person is doing the work they’re best at. The controller isn’t bored by the close, and the CFO isn’t buried in reconciliations.
Questions to ask before you write the job description
- What decisions do we need help making in the next 12 months? Raise, pricing, hiring plan, a sale?
- Can we trust the numbers today? If the close is slow or the books aren’t on GAAP, that’s a controller problem first.
- Who is asking for this hire, and why? The board, the founder, or an upcoming event like a raise?
- How much of the role is recurring work versus judgment? Recurring work is controller work. Judgment is CFO work.
If the honest answer to “what is this role supposed to do?” is “all the finance stuff,” you need a controller and a fractional CFO, not a CFO.
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