Hiring guide
Fractional CFO vs accountant vs controller: which do you need?
By CFO Index · Published
An accountant, a controller and a fractional CFO can all work with the same numbers, but they should not be hired against the same brief. Start by separating three needs: producing reliable records, running the reporting process and making decisions about what the business does next. One person may cover more than one need; the proposal should say which.
What is the practical difference?
An accountant may prepare or review accounts, handle agreed tax work and advise management. A controller typically oversees accounting and reporting. A CFO mandate can add responsibility for planning, funding and financial decisions across the business. These are overlapping areas, not rigid boundaries. The US Bureau of Labor Statistics describes management accountants as contributors to budgets and decisions, and controllers as managers of reporting and accounting functions. Treat those descriptions as context, not a universal division of work or a definition of outsourced services.
If your numbers arrive late, identify the missing step
Hypothetical example: a UK services company cannot explain last month's margin because supplier invoices are missing and project costs are not assigned consistently. Before commissioning a growth strategy, ask who will collect the records, correct the postings and review the result. Accounting support may handle preparation; a controller may establish the closing timetable and review process. A fractional CFO could coordinate this, but the engagement must include delivery capacity. Buying a few senior advisory meetings does not automatically resolve a backlog.
If the records are reliable but decisions are stuck, define CFO work
A different hypothetical business has timely accounts and a clear bank balance, but cannot decide whether it can afford a new sales team. A useful CFO brief would ask for a hiring scenario, assumptions about the sales ramp, a cash impact and a decision meeting with management. That is different from asking someone to close the books. Name the actual choice, the deadline and the assumptions that need challenging. Ask candidates what evidence they would request before making a recommendation, rather than expecting a confident answer during the sales call.
If you need both, price the two workstreams separately
For a hypothetical ecommerce company with unreliable stock costs and a planned market launch, request two scopes: fix the cost and reporting process, then evaluate the launch using the corrected information. Agree what can happen in parallel and what must wait. A provider may offer both services through one team, or work alongside your accountant. Compare the cost of the complete arrangement, including your team's time. A lower CFO retainer can leave substantial preparation work unassigned; a larger package can include work you already have covered.
Write a responsibility checklist before seeking quotes
List the outputs you need: reconciled accounts, monthly close, management report, rolling forecast, tax filings and decision meetings. For each, record who prepares it, who reviews it, who approves action and when it is due. Use named people or clearly identified roles, not simply 'finance'. Then ask each provider to mark what their fee includes. This exercise is particularly useful when an external accountant already works with you: agree the hand-off instead of paying two parties to review the same report while neither owns the missing input.
Does a CFO replace your local accountant?
Not automatically. For a business with European entities or US operations, list the local accounting and filing work separately from group reporting and management advice. Ask who is responsible for each entity and where additional qualified advisers are needed. Do not assume that a CFO title or a directory listing establishes permission to provide every local service. You may keep an existing accountant and add a fractional CFO for leadership, or choose a provider that explicitly supplies both. Verify the people and scope, not just the label on the package.
Can your existing accountant do the CFO work?
Possibly. Ask whether they have the relevant experience, available time and willingness to own the proposed outputs. A useful test is to give both your existing provider and a prospective CFO the same anonymised decision brief. Compare the questions they ask, proposed deliverables and division of responsibilities. If the main problem is still unclear, commission a bounded diagnostic with a written findings list before agreeing a broad recurring mandate. The result should tell you what support to hire, including when a CFO is not yet the missing role.