Bookkeeper, controller or CFO: what does an agency actually need?
Agencies frequently hire a fractional CFO to fix a problem that is actually a bookkeeping problem, then wonder why the strategic advice never arrives.
The ladder runs bookkeeper, then controller, then fractional CFO, then full-time CFO — and most agencies need the rung below the one they are considering. A bookkeeper produces accurate books. A controller owns process and control. A CFO decides what to do about the numbers. A CFO cannot produce insight from books that were never structured to support it, which is why hiring one before the bookkeeping is right usually disappoints both sides.
The four rungs
| Role | What they own | Roughly when |
|---|---|---|
| Bookkeeper | Accurate, closed books. Categorisation, reconciliation, monthly close, standard reports. | From day one |
| Controller | Process and control. Close discipline, AP/AR, policy, ensuring the numbers can be trusted. | Around $3–5M revenue |
| Fractional CFO | Decisions. Forecasting, pricing strategy, capital, scenario planning. | Around $3–20M, part-time |
| Full-time CFO | All of the above, plus fundraising, M&A, board reporting. | Usually $20M+, or a transaction |
The rungs are cumulative and they are frequently skipped. An agency at $4M with unreconciled books hires a fractional CFO, who spends the first three months doing bookkeeping cleanup at CFO rates, and the strategic work never starts.
The diagnostic is simple. If you cannot trust last month's numbers, you have a bookkeeping problem. If you trust the numbers but do not know what to do about them, you have a CFO problem. Only the second one is worth CFO money.
What each actually delivers
Bookkeeper
Books closed on a committed date, reconciled, on a chart of accounts that fits how the business works. For an agency that means pass-through separated, deferred revenue run monthly, contractors split between delivery and overhead, and clients tracked so margin per client is computable.
Note that everything on that list is structural rather than strategic. It is also the foundation every rung above depends on.
Controller
Owns the process rather than the entries. Close discipline, approval policies, AP and AR run properly, the internal controls that stop errors before they need finding. In an agency, typically the person who makes sure the deferred revenue schedule actually gets updated and the receivables actually get chased.
Fractional CFO
Forward-looking. What price should this service be, can we afford this hire, what happens to cash if the largest client leaves, what would a buyer pay and what would raise it. Genuinely valuable, and entirely dependent on trustworthy inputs.
Full-time CFO
Usually justified by a transaction or by genuine complexity — several entities, international operations, a fundraise, an acquisition. Below that, fractional gives most agencies the same thinking at a fraction of the cost.
The common mis-hire
Reaching two rungs up to fix a problem one rung down.
It happens because the symptom presents strategically. The owner cannot tell which clients are profitable, does not know whether they can afford a hire, and cannot forecast cash. Those feel like CFO questions.
But margin by client is not a CFO deliverable — it is arithmetic on properly structured books. Whether you can afford a hire depends on a cash position that is correct, which depends on client funds and deferred revenue being identifiable in the ledger. Both are bookkeeping structure.
A CFO facing books that cannot answer those questions has two options: do the restructuring themselves at their rate, or produce advice on numbers they do not trust. Neither is what anyone wanted.
The cheaper sequence is to fix the structure first. The re-chart is a defined piece of work, and once it is done a fractional CFO starts on day one instead of month four.
Where we sit, and where we do not
We are the first rung, deliberately. Books closed by the 10th on an agency chart of accounts, with margin by client, a deferred revenue schedule, and contractor tracking. That is a complete job and we would rather do one thing properly than three things adequately.
We do not file or sign your return, do tax planning, perform audits, or act as a fractional CFO. When you need those, we hand a clean, closed set of books to whoever does — which makes their work faster, cheaper and considerably more useful.
If you are weighing a fractional CFO right now, the honest question to ask them is what they would need from your books to start. If the answer involves several months of cleanup, that is the thing to buy first.
Common questions
When should an agency hire a fractional CFO?−
Typically somewhere between $3M and $20M in revenue, and only once the books are trustworthy. A CFO is for deciding what to do about the numbers — forecasting, pricing strategy, capital allocation. If you cannot trust last month's figures, the problem is one rung down and a CFO will spend their first months, at their rate, fixing it.
What's the difference between a bookkeeper and a controller?+
A bookkeeper produces accurate books — categorisation, reconciliation, monthly close, standard reports. A controller owns the process around them: close discipline, approval policies, AP and AR, and the internal controls that prevent errors rather than find them. Controllers typically become worthwhile around $3–5M in revenue.
Do I need a CFO to know which clients are profitable?+
No. Margin by client is arithmetic on properly structured books — pass-through separated, delivery cost split from overhead, clients tracked, hours mapped to loaded cost. It is a bookkeeping deliverable. A CFO helps you decide what to do about an unprofitable account, not to identify it.
How much does a fractional CFO cost?+
It varies widely by market and scope, and is typically several times the cost of bookkeeping for a fraction of the hours. The relevant comparison is not price but sequence: buying strategic advice on unreliable numbers is more expensive than fixing the numbers first, whatever the rates.
Can a bookkeeping firm do CFO work?+
Some offer both. We do not, deliberately — bookkeeping done properly for one industry is a full job, and firms that bolt advisory onto it tend to end up mediocre at several things. We hand clean books to whoever does the advisory work.
General information for agency owners and operators, not accounting, tax or legal advice. Figures shown are illustrative unless stated otherwise.