What Is a Fractional CFO? Meaning, Role and Cost

A fractional CFO is a chief financial officer who works for a company part-time, on a retainer or project basis, rather than as a full-time employee. "Fractional" refers to the share of their time the company buys: a few days a month instead of every day. The company gets senior judgment on forecasting, capital, pricing and reporting for a fraction of a full-time CFO's cost. The CFO usually works with several companies at once.

Fractional CFOs are most common in startups and growing companies that need CFO-level decisions before they can justify a full-time CFO's salary. In the US, firms that publish their prices start at a median of $2,000 a month for an entry tier, and fuller engagements with regular deliverables usually cost $3,000 to $12,000 a month.

Looking to hire one? ControlFi provides fractional CFO services for startups and growing companies in the US, the UK, Europe and the Middle East.

What does "fractional CFO" mean?

The word "fractional" describes the arrangement, not the seniority. A fractional CFO does the same strategic work as a full-time CFO, in fewer hours. You will also see:

• Part-time CFO: the same arrangement, an older name.
• CFO for hire: a general term for any CFO engaged on contract rather than employed. It usually means fractional or interim.
• Virtual CFO: a fractional CFO who works mostly remotely. Most do.

Two terms are not quite the same thing, and the difference matters when you compare offers:

• Interim CFO: full-time, but temporary. An interim CFO covers a gap, such as a departure, a transaction or a turnaround, for a few months.
• Outsourced CFO: usually a firm, not an individual, taking on the finance function for an established business, often alongside its accounting. "Fractional" usually describes a part-time senior individual embedded with a startup or scale-up. The line is blurry and partly marketing.

What does a fractional CFO do?

A fractional CFO works forward from the numbers. The accountant records what happened. The CFO decides what to do next. In a typical engagement, that means:

1. Cash visibility. Building and running a 13-week cash flow forecast so the company knows its runway week by week, not just at month-end.
2. The financial model. A driver-based 3-statement model that links revenue, costs, hiring and cash, so every plan can be tested before it is committed.
3. Budgets and targets. Turning the model into an annual budget, then reporting actuals against it each month.
4. Unit economics and pricing. Measuring contribution margin, customer acquisition cost and payback, and using them to decide what to sell and at what price.
5. Board and investor reporting. A monthly board pack that shows what changed, why, and what management is doing about it.
6. Fundraising and debt readiness. A model and data room that hold up in diligence, a clean cap table, and a plan for how much to raise and when.
7. Managing the finance stack. Overseeing the bookkeeper, accountant and tools, and fixing the month-end close if it is slow or unreliable.

What a fractional CFO does not do

A fractional CFO does not replace bookkeeping, payroll or tax compliance, and should not be doing any of them. They sit above those functions and depend on them being reliable. If your books are months behind or inaccurate, fix that first: a CFO working from bad numbers produces confident, wrong decisions.

Fractional vs full-time vs interim vs outsourced CFO

A controller owns the accounting function. A fractional CFO uses the controller's output to make forward decisions. If your numbers are late or wrong, hire the controller first. Our guide to the fractional controller explains the difference in detail.

How much does a fractional CFO cost?

Prices in 2026, from our benchmark of what a fractional CFO costs, which checked 61 US firms' websites in October 2026:

• Published prices: only 14 of the 59 firms we could load publish their own CFO prices. Their entry tiers start at a median of $2,000 a month, from $950 to $5,500. Top tiers at the larger startup-focused firms start at $4,200–$5,250 a month.
• Market range: cost guides usually quote $3,000–$12,000 a month. That's what fuller engagements with regular deliverables, such as a model, a forecast and a board pack, tend to cost.
• Hourly: only one firm in the sample publishes an hourly rate, from $400 an hour for pre-seed companies. Estimates on firms' blogs commonly range from $150 to $500 an hour.
• UK: FD Capital publishes £600–£1,200 a day, with most placements at £700–£900. That's about £2,800–£4,300 a month for one day a week.

The cheapest tiers mostly buy access: a monthly call or a few hours of advice. Before comparing two quotes, check whether each one buys calls and hours or deliverables.

Compare that with a full-time hire. Published US salary figures for a full-time CFO range from about $230,000 to more than $390,000 a year, before payroll taxes, benefits, bonus and equity. A $6,000 monthly retainer is $72,000 a year, less than a third of the lowest of those salaries. In the UK, FD Capital puts the total employment cost of a full-time CFO at £165,000–£290,000 a year.

Pricing follows scope, not hours. A model that takes forty hours and prevents a bad pricing decision is not better value at eighty.

When should you hire a fractional CFO?

Four signals, any one of which is usually enough:

1. You are raising within the next 6 to 12 months. Investors will test your model, your metrics and your cap table. The time to fix them is before the first meeting, not during diligence.
2. You have crossed roughly $1 million to $2 million of revenue. The founder is still doing the finance, and decisions on hiring, pricing and spend now carry real money.
3. You have taken on debt, or are about to. Covenants, reporting obligations and repayment schedules need someone who reads the terms and forecasts against them.
4. Your board has started asking for things. Monthly reporting, a budget, a cash forecast, a view on runway. If nobody owns those, a fractional CFO usually does.

For the full-time decision, see our guide on when a startup should hire a CFO.

When a fractional CFO is the wrong answer

• Your books are not clean. Hire a bookkeeper or controller first. Otherwise you pay CFO rates for cleanup.
• You need a finance team managed every day. Once there are several people in finance who need daily direction, a full-time CFO is usually the right hire.
• You want someone to raise the money for you. A good fractional CFO prepares the company to raise. Introducing investors and negotiating on commission is a different job, done by brokers and placement agents.

Is a fractional CFO worth it?

It is worth it when a specific decision with real money attached is coming, and nobody in the company can model it properly. It is not worth it as a general "finance oversight" retainer with no defined outputs.

A simple test: at $6,000 a month, a fractional CFO costs $72,000 a year. Name the decision that engagement should improve (the size and timing of a raise, a price change, a hiring plan, a debt facility) and estimate what getting it wrong would cost. If that number is not comfortably larger than $72,000, the engagement is too early or too broad.

The second test is outputs. Before signing, ask what you will have at the end of the first 90 days. A reasonable answer looks like this:

If a prospective fractional CFO cannot describe their first 90 days in deliverables, keep looking. Our guide to the first 90 days with a fractional CFO sets out what each month should produce.

How to choose a fractional CFO

Ask four questions:

1. Have you worked at our stage and in our business model? A CFO who has run finance for a SaaS company at $2 million of revenue knows things a CFO from a $200 million manufacturer does not, and the reverse.
2. Can I see a model you have built? Anonymized is fine. You are checking whether it is driver-based, readable and checks itself.
3. What exactly is in scope, and what is not? Get it in writing: deliverables, cadence and the boundary with your bookkeeper and accountant.
4. How does the engagement end? A good fractional CFO leaves systems and documentation that the next person, fractional or full-time, can pick up.

If you are assessing options now, our fractional CFO services page sets out how ControlFi scopes engagements. Established companies that want to hand over the finance function should look at outsourced CFO services instead.