Interim CFO: What It Is, When You Need One and What It Costs (2026)

An interim CFO is a temporary chief financial officer who steps into the role for a set period, usually full-time. Companies bring one in when a CFO leaves suddenly, before a transaction, or while they search for a permanent hire. Most assignments last three to twelve months. InterimExecs, an interim executive firm, puts its average CFO assignment at 8–9 months.

In the US, startup-focused guides put the cost of an interim CFO at $15,000 to $35,000 a month. UK day rates run £900 to £1,800.

An interim CFO isn't the same as a fractional CFO. An interim CFO fills the seat full-time until a fixed end date. A fractional CFO works part-time, often for years, alongside the company's existing team.

What is an interim CFO?

An interim CFO takes over the CFO's job: running the finance team, the close, the cash, the board and investor reporting, and any live transaction. The difference is that the role is temporary and contracted, not permanent and employed.

You'll also see the role called a contract CFO or temporary CFO. The terms mean the same thing in practice: a senior finance leader hired for a defined period, usually through an interim firm or a personal network.

Interim CFOs are typically experienced CFOs who have chosen project work. That's why they can start quickly. InterimExecs says its executives can start "in as little as 48 hours." Being able to start quickly is most of what you're paying for.

Interim vs fractional vs full-time CFO

Interim cost: Eightx (2026). Fractional range: published market estimates; see what a fractional CFO costs. Full-time: $250,000 base plus about 25% for payroll taxes and benefits, before bonus and equity.

McCracken Alliance describes the difference simply. Interim CFOs "typically work full-time hours as the seated CFO" with "a set end date … in mind." Fractional CFOs work "a negotiated number of hours, typically below 20 per week," in "an open-ended arrangement while the company grows."

When you need an interim CFO

CFO changes are common. In the first half of 2025, S&P 500 CFO turnover reached a seven-year high of 12%, according to Russell Reynolds Associates. 12 of the 61 new S&P 500 CFOs appointed in that period were interims.

At startups and growing companies, an interim CFO usually makes sense in these situations:

1. The CFO resigns or is let go, and someone has to run the close, the cash and the board next week.
2. A transaction is live or close, such as a fundraise, a sale or an acquisition, and the company needs someone to lead due diligence.
3. The numbers have a problem, such as a failed audit, a restatement or a control failure, and a fresh, senior pair of hands is needed to fix it.
4. Planned leave, such as parental or medical leave, longer than a few weeks.
5. A turnaround, where cash is tight and every week's decisions matter.
6. Between permanent hires, while a search runs.

If none of these applies, and the real need is CFO-level work a few days a month, a fractional CFO is usually the better fit. It's also a fraction of the cost. Our guide to when to hire a full-time CFO covers that decision.

What an interim CFO does in the first 30 days

An interim CFO's first month is about stability, not strategy:

• Secure the cash. Build or check a 13-week cash flow forecast in the first week, so everyone knows the lowest cash point and how far away it is.
• Keep the close running. Make sure the books close on time and the bookkeeper or controller knows who they report to.
• Talk to the board and investors early. A short, factual update on what's changed and what happens next prevents surprises.
• Protect live deals. If a raise, sale or audit is underway, take ownership of the timeline and the data room.
• List what's unknown. Systems access, undocumented processes and promises the previous CFO made all need finding fast.

A part-time version of the same idea is covered in our guide to the first 90 days with a fractional CFO.

How much an interim CFO costs

Three things to know when reading these figures:

• Startup-focused monthly rates are the relevant ones for most founders. JRG's daily range covers all C-level interim roles at larger companies, so it works out far higher per month.
• UK day rates convert to roughly 22 times the day rate a month for a full-time assignment, according to FD Capital. It puts a six-month assignment at £1,200 a day at approximately £150,000.
• Urgency costs more. Eightx says a seven-day emergency start carries a 15–25% premium.

An interim CFO often costs as much per month as a permanent CFO, or more. A $250,000 salary costs about $26,000 a month once taxes and benefits are added. You're paying for speed, experience and the freedom to end the arrangement without severance or an equity grant.

Worked example: your CFO leaves four months before a Series B

Take a Series A software company with $8 million of ARR and a controller in place. Its CFO resigns four months before the planned Series B. The board wants a permanent CFO, and the search is expected to take about six months.

There are three realistic options:

The interim rate is the middle of Eightx's $15,000–$35,000 range. The fractional rate is the top of the $5,000–$8,000 range Pilot reports as average.

The interim option costs $102,000 more than the fractional option over six months. Whether that's worth it depends on one question: does this raise need someone in the CFO seat every day?

• Choose an interim CFO if the controller can't run the close alone, the board needs a single finance owner, or diligence is already underway.
• Choose a fractional CFO if the controller can run the books, the main gap is the model and investor story, and the raise is still a few months away.
• Avoid rushing a permanent hire. It's tempting, but an interim or fractional CFO lets the board take the time to hire well.

How to hire an interim CFO

1. Write down the end date and three outcomes. For example: "close the Series B," "pass the audit" or "hand over to a permanent CFO by March." Without outcomes, interim roles drift.
2. Pick the right channel. Interim executive firms are fastest. Your investors' networks and fractional CFO firms are good alternatives. FD Capital says urgent requests typically get introductions "within 48 hours."
3. Check they've handled your exact situation before: a fundraise, an audit or a turnaround. Interim CFOs are specialists, and the right experience matters more than the title.
4. Agree on the handover. Decide whether the interim will help recruit their successor, and how long they'll overlap with the new CFO.
5. Read the contract terms. Check the monthly or daily rate, the notice period (FD Capital says one month either way is standard) and any fee if you hire the interim permanently.

Can an interim CFO become permanent?

Sometimes. Some companies use an interim period as a long trial. Check the contract first: some interim firms charge a fee if you hire their executive permanently. Many interim CFOs prefer project work and won't want a permanent role, so ask early rather than assume.