Fractional CFO vs controller
A controller closes the books, files taxes, and keeps GAAP accurate. A fractional CFO builds the forecast, tells the board the story, and runs fundraising. You need a controller first; you need a fractional CFO the moment finance decisions start driving strategy.
| Criterion | Controller | Fractional CFO |
|---|---|---|
| Owns the books | Yes | No, reviews only |
| Owns the forecast | No | Yes |
| Board reporting | Rarely | Always |
| Fundraising / diligence | No | Yes |
| Typical experience | 8–15 yrs accounting | 15–25 yrs finance leadership |
| Cost (US, 2026) | $4K–$10K / mo | $6K–$18K / mo |
| Hire first when | Books are messy | Numbers drive decisions |
What a controller owns
The controller runs the accounting close: bank reconciliations, AP/AR, payroll accuracy, revenue recognition, monthly financial statements, sales-tax filings, and year-end tax package. The output is accurate historicals — you can trust last month's numbers.
What a fractional CFO owns
The fractional CFO runs strategic finance: rolling 13-week cash forecast, annual budget and quarterly reforecast, unit economics, pricing, fundraising narrative and diligence, board deck, banker and investor relationships, and hiring the finance team (including the controller). The output is forward-looking decisions — where the numbers should go.
Order of operations
Under $1M ARR: bookkeeper only. $1M to $3M ARR: outsourced controller ($4K to $8K per month). $3M to $10M ARR: controller plus fractional CFO ($10K to $18K combined). $10M+ ARR: in-house controller plus fractional or full-time CFO depending on complexity.
Common mistakes
Hiring a fractional CFO before books are clean — they spend the first 90 days cleaning up historicals instead of building forward. Or hiring a controller and expecting them to run fundraising — that is a category error and both parties lose.
Hire a vetted fractional executive.
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FAQs
Can one person be both?
At sub-$3M ARR sometimes yes, but the skill sets diverge fast. Above $5M ARR, insist on separate people.
Does a fractional CFO close the books?
No — they review, sign off, and use them. Closing belongs to a controller or accounting firm.