What is the difference between a fractional CFO and a controller or bookkeeper?

These roles sit at different levels of the finance function and should not be treated as substitutes for each other. A bookkeeper records financial transactions and keeps the books in order. A controller manages the accounting function, oversees month-end close, and ensures the numbers are accurate. A CFO — fractional or otherwise — operates at a strategic level: financial planning and analysis, investor relations, business modelling, cash management, and the financial dimension of major business decisions. Hiring a bookkeeper when you need a CFO is one of the most common and expensive mismatches we see. The presenting symptom is usually that the CEO is still the only person who can answer strategic finance questions.