When Should a Startup Hire a CFO? A Stage-by-Stage Guide

Most startups don't need a full-time CFO until they are preparing for a Series B, at roughly $8 million to $15 million of annual recurring revenue (ARR). Before that, the books are usually kept by a bookkeeper, an outsourced accounting firm or a controller. A fractional CFO covers the CFO-level work a few days a month: the model, the forecast, the board pack and the fundraise.

Hire earlier if any of these is true:

• You are raising in the next six to nine months.
• Your runway is under 12 months.
• The business has become complex: several entities or currencies, debt with covenants, or an acquisition.

The rest of this guide shows how the finance team typically grows by stage and why the published advice disagrees. It also works out what each option costs in months of runway.

The finance team by stage

The ARR bands follow the thresholds the venture firm CRV published in June 2026:

• From $1 million of ARR: "a fractional CFO might be the right move."
• At $8 million: this "marks where the volume of financial decisions typically outpaces" what a founder or part-time resource can manage, which is around when startups begin preparing for a Series B.
• Past $15 million: going without dedicated finance leadership "is risky."

If you're not a SaaS company, read ARR as annual revenue. The bands move earlier if you grow very fast or your business model is complex, and later if your finances are simple.

Why the published advice disagrees

Read the venture sources and the answers range from $1 million to $30 million of ARR:

• SaaStr's Jason Lemkin would bring in someone full-time "as early as $1m-$2m ARR if you can find someone great."
• CRV puts the move to full-time finance leadership at $8 million of ARR.
• Lemkin again notes that many founders hire a "CFO" around $10 million to $30 million of ARR, "when we really need a VP/SVP of Finance." The OnlyCFO post he introduces makes the same point: founders "think they need a CFO when really they just need a strong (S)VP of Finance."

The sources disagree mostly about the title, not the timing. "Finance" at a startup covers three different jobs:

1. Keeping the books right. This means accurate, on-time accounts, payroll, revenue recognition and controls. It's a controller's job, and it looks backward.
2. Planning and reporting. This covers budget, forecast, board pack and unit economics. A VP of Finance or a CFO owns it, and it looks forward.
3. Capital and strategy. This covers fundraising, debt, pricing, M&A and investor relations. It's the core of the CFO role.

A full-time head of finance at $2 million of ARR is usually a VP of Finance doing jobs 1 and 2. A true CFO earns their salary on job 3. So the useful question isn't "do we need a CFO?" It's "which of these three jobs is nobody doing well right now?"

What a CFO does in a startup

A startup CFO's work changes as the company grows:

• Seed to Series A. Builds the 3-statement model and owns the cash runway. Prepares the data room and the financial story for the raise, and sets up the monthly reporting the board will expect.
• Series A to Series B. Runs the annual operating plan, the monthly board pack and budget-versus-actual reviews. Works out unit economics by customer and product, using contribution margin rather than gross margin. Tests pricing and hiring decisions against the cash plan.
• Series B and beyond. Builds and leads the finance team and puts in controls ready for an audit. Raises and manages debt, runs M&A, and manages investor relations.

A CFO doesn't do the bookkeeping, file the tax returns or run payroll. If those are the problems, you need a bookkeeper, a controller or an accounting firm first. A CFO hired on top of unreliable books spends their first months fixing them at CFO rates.

Seven signs you need CFO-level help

1. You're raising in the next six to nine months. CRV calls three months "a reasonable minimum lead time" to get clean books, proper revenue recognition and a defensible model in place before a raise. Investors will test your numbers line by line, and the time to find the gaps is before they do.
2. Runway is under 12 months, or nobody can name your lowest cash point. If you can't say which week next quarter cash is lowest, start with a 13-week cash flow forecast.
3. Your model doesn't survive questions. If changing one assumption means rebuilding three tabs, it won't hold up in a fundraise or a board meeting.
4. The board pack takes the founder days every month. That's time taken away from selling and building, and the board will notice if the numbers change between meetings.
5. The business got more complex. Common triggers are a second entity or country, foreign currency, venture debt with covenants, usage-based or multi-part pricing, or an acquisition.
6. You're making pricing and hiring decisions without unit economics. If you don't know which customers and products make money after variable costs, every growth decision is a guess.
7. The books close late or change after they're closed. In our experience, anything beyond three weeks after month-end is a warning sign. This one is a controller problem first: fix the close, then add CFO-level work on top.

One sign is a reason to get help with that problem. Three or more usually mean the CFO-level work is not being done, and it's time to bring someone in.

When you don't need a CFO yet

• You're pre-revenue or under about $1 million of ARR with simple spending. A bookkeeper and a founder who knows the numbers are enough. Get project help for the seed model.
• The real problem is the books. If the numbers are late or wrong, hire a controller or an accounting firm first.
• You need one deliverable, not a person. A model for a raise, a valuation or a financial due diligence preparation is a project with a scope and an end date, not a hire.

Hiring too late costs more than hiring too early, but neither has to happen. A fractional CFO lets you start small and scale up as the work grows.

Worked example: what a CFO costs a Series A startup in runway

Take a Series A SaaS company:

• $3 million of ARR and 30 people
• $12 million in the bank after the round
• net burn of $450,000 a month

Runway today: 26.7 months.

Option 1: a full-time CFO. Published averages for a full-time US CFO run from about $230,000 to more than $390,000 a year (see what a fractional CFO costs for the sources). Take a $250,000 base salary:

• Payroll taxes and benefits add about 25%. US Bureau of Labor Statistics data puts them at about 24% on top of salary. That brings the loaded cost to $312,500 a year, or $26,042 a month.
• SHRM's 2025 benchmarking puts the average cost per executive hire at $35,879.
• Bonus and equity come on top, and are left out here.

Option 2: a fractional CFO at $6,500 a month, the middle of the $5,000–$8,000 range Pilot reports as average.

A full-time CFO costs this company about a month and a half of runway, and the fractional option about 0.4 months. The first-year difference is roughly $270,000.

The money isn't the real question. At $3 million of ARR, outside of a fundraise, the CFO-level work in a typical month is:

• the board pack and monthly review
• a forecast update
• a pricing or hiring decision or two

In our experience, that's four to six days a month. A full-time CFO would fill the rest of the month with controller work at CFO pay, or get bored and leave.

The math flips when the CFO-level work fills most of the week. That happens when the company is:

• preparing a Series B
• running a finance team of three or more
• negotiating a debt facility
• running an acquisition
• operating several entities across countries

That's usually the $8 million to $15 million ARR range in the table above.

CFO, VP of Finance, controller or fractional CFO?

Many Series A companies hire a VP of Finance on purpose. CRV calls it "a hands-on title many Series A companies deliberately pick," because it leaves room to hire a CFO above them later. If you want the books and the CFO-level work from one provider, an outsourced CFO engagement combines the accounting and finance leadership.

How to hire your first CFO

1. Write down the job for the next 18 months. List three to five outcomes, such as "raise a Series B," "board pack in five days" or "first audit." The list tells you whether you need a controller, a VP of Finance or a CFO.
2. Choose the title for the job, not the ego. A VP of Finance at Series A can grow into a CFO. A CFO title given too early is hard to take back.
3. Decide full-time or fractional by the amount of work. If the CFO-level work is under about two days a week, start fractional.
4. Test with real work. Give the finalists your model and your last board pack. Ask what they would change in the first 90 days, and how they'd explain your numbers to an investor.
5. Check references with founders and board members, including about a raise that went badly. That's where finance leaders show what they're worth.
6. Review it twice a year. Andreessen Horowitz advises founders and boards to assess the company's finance needs against the current finance leader "on a semi-annual basis, at the very least."

If a fractional CFO is already in place, use them to write the job description, interview the finalists and hand over. A good fractional CFO should help you outgrow them.