Hiring a full finance team used to be one of the clearest signs that a business had “made it”. A finance director, a couple of accountants and a bookkeeper on staff meant the company was serious about its numbers. That model is quietly being replaced for a growing number of scale-ups.
Finance-as-a-Service, where a business brings in external finance expertise on a flexible basis rather than building an in-house team from scratch, has moved from a cost-cutting workaround to a genuine strategic choice. Growth businesses in particular are finding it gives them senior-level financial input without the overhead of a full permanent team.
This article looks at what is driving the shift, what Finance-as-a-Service actually covers, and what growth businesses should consider before making the move.
What finance-as-a-service actually means
At its core, Finance-as-a-Service covers a range of external finance support, from day-to-day bookkeeping through to senior strategic input, delivered on a flexible basis rather than through permanent hires. For many businesses, this starts with outsourced accounting, covering the routine work of bookkeeping, payroll and management accounts without the cost of an in-house team.
For businesses that need more senior input, fractional CFO services extend this further, bringing in experienced finance leadership for a set number of days each month. This gives growing businesses access to strategic financial thinking, cash flow forecasting and investor reporting support, without the cost of a full-time executive salary.
Why growing businesses are making the switch
Scaling businesses often reach a point where founders can no longer manage the finances themselves, but are not yet ready to justify a full permanent finance department. This gap is exactly where Finance-as-a-Service has found its footing over the past few years.
The flexibility is a major draw. A business experiencing rapid growth, a seasonal spike, or a funding round can scale finance support up or down as needed, rather than committing to permanent headcount based on a snapshot of current needs. This matters particularly for businesses whose finance requirements change significantly from one quarter to the next.
The cost case for outsourcing finance
Building an internal finance function from scratch is expensive well beyond salaries alone, once recruitment, training, software and management time are factored in. Outsourced accounting arrangements typically bundle much of this into a predictable monthly cost, which makes budgeting considerably more straightforward for growing businesses.
For businesses researching options in London specifically, London accountants offering these services often combine day-to-day bookkeeping with more senior advisory support under one arrangement, which can suit a business that expects to need both over time.
Where fractional support fits best
Fractional CFO services tend to work best for businesses that need experienced financial judgement occasionally rather than daily, such as preparing for a funding round, restructuring pricing, or building a financial model for investors. A fractional CFO can step in for exactly this kind of work without becoming a permanent fixture on the payroll.
This model suits founders who want senior-level input at key moments, such as board meetings or investor updates, without carrying the ongoing cost of a full-time executive whose time might otherwise go underused between major decisions.
What to check before choosing a provider
Not all Finance-as-a-Service providers cover the same ground, so it is worth being clear about what a business actually needs before signing on. Some focus purely on bookkeeping and compliance, while others build in strategic support as standard.
Checking a provider’s experience with similar-sized businesses in the same sector is worth the time, since the right fit often comes down to whether they have handled comparable growth challenges before, not just whether they can manage the basic accounting. For more on how growing businesses are restructuring their operations more broadly, London Loves Business’s growth section regularly covers similar shifts across hiring, technology and operations.
The bigger shift in how businesses think about finance
According to the Association of Chartered Certified Accountants, the demand for flexible finance models has grown steadily as businesses look for ways to access senior expertise without the fixed cost of permanent hires. This reflects a broader shift in how growth businesses think about specialist functions generally, not just finance.
Conclusion
Finance-as-a-Service has moved from a stopgap measure to a considered choice for growing businesses that need senior financial input without the cost of a full in-house team. Whether through outsourced accounting for the day-to-day work or fractional CFO services for bigger strategic decisions, the model gives founders access to expertise that scales with the business rather than sitting fixed on the payroll.
The right setup depends on where a business is in its growth journey, but for many scale-ups, this flexible approach to finance is proving far more practical than building a department from the ground up.
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