There’s a stage in almost every startup’s growth where the founder’s relationship with the finances starts to break down. Not because the numbers are catastrophic – but because the business has grown complex enough that managing it with a spreadsheet and a good accountant isn’t enough anymore.

That’s usually when the question surfaces: do we need a CFO?

The honest answer is: probably yes – but not necessarily a full-time one. Here’s how to think through it.

The Signs You’ve Outgrown Your Current Setup

There are a few patterns that tend to signal a startup is approaching the point where proper financial leadership becomes necessary rather than optional.

You’re raising, or about to. The moment you start having serious conversations with investors, your financial infrastructure gets scrutinised. If you don’t have a financial model built with investor-grade rigour, clean historical financials and a coherent capital story, you’re walking into those conversations underprepared.

Your financial complexity has increased significantly. Multiple revenue streams, cross-border transactions, headcount growing quickly, equity schemes in place – each of these adds layers that require more sophisticated financial management than most accountants are set up to provide.

You’re making strategic decisions with incomplete financial information. If you find yourself committing to hires, contracts or market expansions without a clear view of the cash flow implications, that’s a signal you need someone who can translate the financial picture into strategic input.

Cash flow is becoming harder to manage. If cash is regularly tighter than expected, or you’re regularly surprised by your cash position, that’s not a cash flow problem – it’s a financial leadership problem.

What a Full-Time CFO Actually Costs

A senior, experienced CFO in the UK will typically command a salary of £120,000 to £200,000 or more, depending on their background and the stage of your business. Add employer’s National Insurance, pension contributions and equity expectations, and you’re looking at a significant ongoing commitment.

For most startups at seed or early Series A stage, that cost simply isn’t justifiable – not because the function isn’t needed, but because a full-time hire at that level isn’t the right fit for where the business is.

Why a Fractional CFO Often Makes More Sense

A fractional CFO gives you senior financial leadership – the strategic thinking, the investor-facing capability, the model-building and the management reporting – at a fraction of the cost of a full-time hire, because you’re only paying for the time and output you actually need.

For most startups, that might be two to four days a month during normal operations, scaling up significantly around a fundraise or a period of rapid growth. The engagement is flexible and can evolve as the business does.

This isn’t a compromise on quality. A good fractional CFO brings the same experience as a full-time hire – often more, because they’ve worked across multiple growth-stage businesses and can apply pattern recognition that a single-company CFO wouldn’t have.

When Does a Full-Time CFO Make Sense?

The inflection point is typically when the financial function needs daily strategic input and the business has the revenue base to support the cost. That usually means you’re post-Series A, you have significant revenue, and the complexity of your financial operations – reporting, treasury management, investor relations, team leadership – genuinely requires someone embedded full-time.

Before that point, a fractional CFO paired with a strong accounting function is almost always the more efficient solution.

The Question Worth Asking

Rather than asking “do we need a CFO?”, the more useful question is: “what specific financial leadership problems are we trying to solve right now?” The answer to that usually makes the right solution much clearer – whether it’s a fractional engagement ahead of a raise, ongoing strategic support through a period of scaling, or a full-time hire as the business matures.

Whatever the answer, the worst outcome is waiting too long. Financial infrastructure tends to compound – small gaps become bigger problems, and cleaning them up mid-raise or mid-scale is much harder than building them right in the first place.

Disclaimer: This article is general in nature and does not constitute financial advice. Speak to a qualified advisor about the right financial leadership structure for your business.