A fractional CFO is a part-time chief financial officer who works with your business on a regular but limited basis. Instead of paying $200,000 or more for a full-time finance executive, you get the same strategic expertise for a fraction of the cost. Most arrangements involve a few hours per week or month depending on your needs.

The “fractional” part matters because most small businesses don’t need someone in that seat full-time. They need high-level financial thinking applied at key moments: when planning for growth, evaluating a major purchase, negotiating with banks, or figuring out whether to hire that next crew member.

What does a fractional CFO actually do? They focus on forward-looking decisions, not day-to-day transaction recording. That means building budgets and forecasts, analyzing profitability by service line or customer, planning cash needs for seasonal swings, evaluating financing options, and helping you understand what the numbers mean for your next move.

A fractional CFO is different from a bookkeeper, who handles your business bookkeeping and keeps records accurate. They’re also different from a controller, who adds financial discipline and internal controls. A fractional CFO assumes the books are already solid and uses that data to drive strategy. If your books are a mess, you need a bookkeeper first.

Signs you might need a fractional CFO include making decisions that feel like guesses. Should you take on that big project? Can you afford to hire two more people? Is it time to buy equipment or keep renting? If you’re relying on gut feel because your financials don’t give you clear answers, a fractional CFO can build the analysis you need.

If you’re seeking financing, banks and investors want projections, cash flow models, and someone who can speak their language. A fractional CFO prepares these materials and handles those conversations.

Fast growth with tight cash despite good revenue is another indicator. Growth eats cash, and a fractional CFO can model the timing of your receivables and payables, identify where cash is getting stuck, and build a plan to fund expansion without running dry.

When you probably don’t need one: if your main problem is that the books aren’t getting done or aren’t accurate, start with solid monthly bookkeeping. A fractional CFO working with bad data is just making confident-sounding guesses.

If you need better monthly reports and budget tracking but aren’t facing major strategic decisions, a fractional controller might be the right fit. Controllers add structure and reporting rigor at a lower price point than CFO-level work.

Most businesses under $1 million in revenue don’t need a fractional CFO yet. Between $1 million and $5 million, it depends on complexity and growth plans. Above $5 million, the strategic questions usually justify having a financial partner in your corner.