What Does a Fractional CFO Really Do?

The title gets used loosely.

Ask five people what a fractional CFO does and you will get five different answers. Some will say part-time finance director. Others will say strategic adviser. A few will say "like a CFO, but cheaper." None of these are quite right.

A fractional CFO is an experienced finance professional who takes on the CFO role for a company — fully, not partially — but without a full-time employment contract. The fraction refers to time, not commitment or capability.

What the work actually looks like

At Peak Consulting, fractional CFO work typically falls into three areas. First, financial structure: building or fixing the reporting, budgeting, and forecasting systems so that leadership has reliable numbers to work from. Second, decision support: being in the room (or on the call) when pricing decisions, hiring plans, or funding discussions need a finance perspective. Third, strategic execution: leading specific projects — an investor process, a cash flow turnaround, an accounting team overhaul — that require senior CFO expertise rather than routine finance management.

What it is not

A fractional CFO is not a bookkeeper. Not a controller. Not a part-time accountant who also attends board meetings. The distinction matters because companies that hire at the wrong level for the problem they have will not solve the problem — they will just add a line item to the payroll.

Who it is for

The fractional CFO model works best for companies at a stage where finance genuinely needs senior-level leadership — but where a full-time CFO salary, benefits package, and long-term commitment would be premature. That typically means growth-stage companies between 15 and 150 employees, businesses facing a specific finance challenge (a fundraise, an acquisition, a restructuring), or founder-led companies where the CEO has been absorbing the CFO role by default.

The model scales in both directions. Engagement can start at two days a week and expand to full-time during a transaction. It can step back down once a process is complete. That flexibility is not a compromise — it is the point.