Most founders know they will need senior finance help eventually. The harder question is when. Hire too early and you pay executive rates for bookkeeping problems. Hire too late and you walk into a fundraise with numbers you cannot defend. This guide lays out the five signals we see most often in practice, what a fractional CFO actually costs, and what a good first 90 days looks like.

What a fractional CFO actually does

A fractional CFO is a senior finance leader who works with your company on a part-time, ongoing basis, typically a few days per month. The scope is the same as a full-time CFO: budgeting and forecasting, board and investor reporting, cash and runway management, fundraising support, and financial strategy. The difference is cost and flexibility. You buy the hours you need at your stage, and scale up as complexity grows.

A fractional CFO is not a bookkeeper or a controller. Bookkeeping records what happened. A controller makes sure it is recorded correctly and on time. A CFO decides what the numbers mean for your next decision: pricing, hiring, runway, and raising. The model works best when the bookkeeping and monthly close are already handled by a competent team, which is why many firms, ours included, offer both under one roof.

Five signals it is time

1. You are preparing a priced round

SAFEs close on a story. Priced rounds close on diligence. When institutional investors enter the picture, they expect a three-statement model, a defensible forecast, clean historical financials, and a data room that does not fall apart under questions. Building that mid-raise is expensive and visible. Building it two or three quarters ahead of the raise is a routine engagement.

2. Investors are asking for reporting you cannot produce

If a board member or lead investor has asked for monthly reporting, a budget-versus-actual view, or a runway update, and producing it takes your team more than a few days, the reporting infrastructure is the problem. A fractional CFO sets up a management reporting package that closes on a fixed calendar every month: balance sheet, income statement, variance commentary, and the handful of KPIs your investors actually read.

3. You are adding a second entity or second jurisdiction

The moment you incorporate a US subsidiary, open a UAE entity, or set up an offshore issuer, your finance complexity jumps: intercompany agreements, transfer pricing, consolidated reporting, and multiple filing calendars. This is the point where founder-managed finance breaks most often, and where mistakes are costly to unwind. Cross-border structuring decisions made casually in year one become tax problems in year three.

4. The founder is spending more than a day a week on finance

Founder time is the most expensive input in the company. If you are personally chasing invoices, reconciling accounts, or building board slides from spreadsheets, you are paying an executive salary for clerical work while your actual job goes undone. The fully loaded cost of a fractional finance team is almost always lower than the opportunity cost it replaces.

5. Cash decisions are being made on gut feel

Hiring plans, pricing changes, and big vendor commitments should be tested against a forecast, not a bank balance. If your runway number is a guess that moves by months depending on who you ask, you need forecasting discipline before you need anything else.

What it costs

Market rates for fractional CFO services generally run from $3,000 to $10,000 per month depending on scope, cadence, and complexity. Our monthly CFO advisory starts at $3,500 per month. Project work is usually priced separately: fundraising support from $5,000 per engagement, M&A advisory from a $10,000 retainer.

Compare that to a full-time startup CFO: $250,000 or more in base salary in most North American markets, plus equity, plus the recruiting risk of a senior hire made before the role justifies it. For most companies between seed and Series B, the fractional model delivers 80 percent of the value at roughly a fifth of the cost.

What a good first 90 days looks like

Month one is diagnosis and cleanup. Expect an entity and jurisdiction map, a review of the books and any needed catch-up, and a clear list of filing obligations and deadlines by entity.

Month two is infrastructure. The monthly close lands on a fixed calendar, a management reporting package goes to you and the board, and a driver-based forecast model replaces the static spreadsheet.

Month three is strategy. With reliable numbers flowing, the conversation moves to runway scenarios, hiring plans, pricing, and raise timing. This is the point where the engagement starts paying for itself visibly.

Questions to ask before you sign

Ask who actually does the work, a partner or a junior handed your file. Ask whether the firm has operated in your industry and your jurisdictions, because a SaaS-only CFO will struggle with token treasuries, and a domestic-only CFO will struggle with a Canada-US-UAE structure. Ask what the reporting package looks like, and ask for a sample. Finally, ask how the CFO service connects to bookkeeping and tax: when those functions live in separate firms, the gaps between them become your problem.

If you are weighing the decision now, our fractional CFO advisory page covers scope and pricing, or you can book a consult and walk through your situation with a CPA directly.