What a Fractional CFO Costs per Month and How to Budget

Four models cover most engagements, and each fits a different situation:

• Monthly retainer: a fixed fee for a defined scope and a set number of hours or meetings. It gives predictable cost, and the risk is paying for capacity you do not use.
• Hourly: you pay for time used. It suits short, uncertain projects, but costs can drift upward without a cap.
• Fixed project fee: a set price for a defined deliverable, such as a fundraising model or a diligence package.
• Hybrid: a lower retainer for ongoing reporting plus project fees for events like a raise or an audit.

Ask every candidate which model they use and what happens when you need more than the agreed hours. The overage rule is where budgets break. The scope of work template shows the clauses to include, and the interview question list covers how to test a candidate.

Price follows the amount of judgment and coordination the work needs. The main drivers:

• Scope layers: overseeing a bookkeeper, running the month-end close, building forecasts, managing cash and leading fundraising are progressively heavier.
• Books condition: if the ledger needs cleanup, expect either a separate project fee or a higher retainer for a period.
• Entities and complexity: multiple legal entities, inventory, multi-state sales tax, foreign currency or revenue recognition issues all add work.
• Reporting cadence: weekly cash reports and board decks cost more than a quarterly summary.
• Seniority and specialty: a former public-company CFO and a generalist FP&A consultant price differently, and you pay for what you need.
• Event load: a raise, an acquisition or a lender relationship adds hours.

Because the work list drives the price, describe your needs before you ask for a quote. A vague request gets a vague, often padded, proposal.

Finance is part of general and administrative spending, so compare a proposal to that line. Median G&A spending among private B2B SaaS companies is 15 percent of ARR¹, and other business models will have their own norms.

Here is a worked check. Suppose your ARR is $6,000,000, which puts median G&A at about $900,000 a year. Say a fractional CFO quotes $10,000 a month, which is $120,000 a year, or roughly 13% of that G&A budget. The question then becomes whether the same money would buy a stronger result as a full-time controller, a part-time analyst or more of the CFO's time.

Repeat the check for each proposal with three columns: what you get each month, what is excluded, and what you would pay if you needed double the hours. The comparison, not the sticker price, tells you which proposal is cheaper for the work you actually need.

Fractional help fits when you need judgment more than daily operational capacity. Signs it still fits: your accounting is stable, you need forecasting, board reporting or a financing plan, and your team can handle daily finance tasks.

Signs you have outgrown it:

• The CFO's hours are consistently maxed out and work is queuing.
• You need someone to manage a finance team on a daily basis.
• Investors, lenders or auditors want more presence than a part-time schedule allows.
• Your finance work has become part of daily operations, such as pricing, deal desks and procurement.

Compare full-time cost as a whole package, including salary, benefits, bonus and equity, plus recruiting time, rather than salary alone. The bookkeeper, controller and CFO guide helps you decide which role you need first.

If you want the CFO to build forecasts in dedicated software, the planning software comparison shows what to weigh.