| Comparison | Controller | Fractional CFO |
|---|---|---|
| Primary focus | Accuracy of historical financial records | Forward-looking strategy and decisions |
| Time orientation | Backward: what already happened | Forward: what should happen next |
| Owns | Month-end close, reconciliations, financial statements | Forecasting, fundraising, board reporting |
| Typical engagement | $1,500-$3,500 / month | $2,500-$8,000 / month |
| Stage that adds first | $1M-$3M revenue | $2M+ revenue or pre-fundraise |
| Reports to | CFO or founder | CEO or founder |
| Decision-grade output | Reliable financials you can trust | Forecasts, scenarios, capital plans |
What a controller does
A controller's primary responsibility is accuracy and integrity of financial records. They own the month-end close process, manage the accounting team, ensure that transactions are properly recorded and categorised, produce financial statements, and maintain internal controls. They're looking backward - ensuring the historical record is correct. A good controller means you can trust the numbers.
A controller is accountable for the accuracy and timeliness of financial statements. Month-end close, reconciliations, variance analysis, audit support, and internal controls. They are the person who signs off that the numbers are right. When a board member or investor asks "can I trust these financials," the answer comes from the controller's work.
The day-to-day involves reviewing the bookkeeper's output, approving journal entries above a threshold, managing the close calendar, preparing financial statements, and producing variance commentary. The controller rarely works directly with the CEO on strategy. They work with the CFO (or founder acting as CFO) to produce the numbers that strategy is built on.
What a CFO does
A CFO's primary responsibility is using financial information to drive business decisions and strategy. They build financial models, manage investor relations, lead fundraising processes, advise on capital structure, and help the CEO and board think through strategic decisions with financial rigour. They're looking forward - using the past to make better decisions about the future. A good CFO means you're making better decisions with your numbers.
A CFO is accountable for forward-looking financial leadership. Financial modeling, fundraising, investor relations, board reporting, budgeting, capital allocation decisions, and strategic analysis. They turn the numbers into decisions. When the CEO asks "should we hire 10 engineers or 15," the answer comes from CFO-grade analysis.
A good CFO also sets the financial priorities for the whole company. Which metrics matter. What the forecast assumes. How the business should be measured. These are framework decisions, not number-crunching, and they shape what the controller and team produce. A CFO without a controller underneath is usually making decisions on shaky numbers.
Which one comes first
Controller comes before CFO. You can't do meaningful financial analysis or strategic modelling on inaccurate books. The sequencing is: clean bookkeeping first, then controller-level oversight to ensure accuracy and close discipline, then CFO-level analysis and strategy once the foundation is solid. Skipping straight to CFO work on top of messy books produces sophisticated-looking analysis built on unreliable data.
Most companies need controller-grade work before they need CFO-grade work. Bad numbers produce bad strategy no matter how smart the strategist is. The sequence that typically works: clean bookkeeping first, then controller oversight, then CFO strategy on top. Skipping the middle layer is how you get CFO work built on unreliable data.
The common mistake is hiring a CFO first because it feels senior and strategic, then discovering that the CFO is spending most of their time fixing the books instead of doing strategy. An expensive senior person doing controller work is a waste of their skill set and your money. Get the controller layer first.
The fractional model for both
Both roles are increasingly available in fractional form, which makes sense for businesses under $10-15M in revenue. A fractional controller handles the month-end close, review, and internal control functions on a part-time basis. A fractional CFO handles the strategy, modelling, and investor-facing work. Many businesses benefit from both simultaneously, working in a coordinated way - which is the model Finsightic is built around.
Finsightic handles accounting, controller oversight, and fractional CFO work for growing companies. Fixed monthly pricing, no long-term contracts.
The fractional model works well for both roles, especially under $25M revenue. Fractional controller typically runs $3-6K/month at 10-20 hours. Fractional CFO typically runs $4-8K/month at similar hours. Together, that is $7-14K/month for senior financial leadership at a company that could not afford $300K+ in full-time salaries.
Having both fractional is also a useful transition structure. As you grow, you can bring the controller in-house first (a full-time senior accountant or in-house controller), while keeping the fractional CFO. Eventually both go in-house. The fractional phase lets you test the fit of the work before committing to full-time hires.
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