Growing SaaS and tech companies eventually reach a point where they need senior financial leadership. The question is whether to hire a full-time finance director or engage a fractional CFO. Both roles provide strategic financial guidance, but they differ significantly in cost, flexibility, and how they fit into a scaling business. This guide compares the two options to help you make the right decision for your stage of growth.
A finance director is a full-time, senior hire who leads the finance function. They manage the finance team, oversee statutory reporting, handle audit relationships, and sit on the leadership team. In the UK, a finance director for a tech company typically costs between £100,000 and £150,000 in salary alone, plus employer NI, pension, benefits, and equity — bringing the total cost to £130,000–£200,000 per year. For companies with £5M+ in revenue and a finance team of 3 or more, a full-time finance director makes sense. Below that threshold, most of the role sits idle.
A fractional CFO is a senior financial leader who works with your business on a part-time retainer — typically 1 to 4 days per month. They provide the same strategic value as a finance director: financial modelling, cash flow forecasting, board reporting, investor relations, budgeting, and exit preparation. The difference is that you only pay for the time you need. A fractional CFO in the UK typically costs between £1,500 and £7,000 per month, which is a fraction of a full-time hire. For SaaS and tech companies between £300K and £5M ARR, a fractional CFO delivers CFO-level thinking without the overhead of a permanent hire.
Cost: A full-time finance director costs £130K–£200K per year. A fractional CFO costs £18K–£84K per year. For early-stage companies, the savings are significant and can be redirected into product development or sales.
Flexibility: A fractional CFO scales with your business. You can increase their involvement during fundraising or exit preparation, and reduce it during quieter periods. A finance director is a fixed cost regardless of workload.
Experience breadth: A fractional CFO works with multiple companies simultaneously, which means they bring cross-industry insights, pattern recognition, and a broader network. A finance director is embedded in one company and may have a narrower perspective.
Speed to impact: A fractional CFO can start delivering value within weeks. Hiring a finance director takes 3–6 months including recruitment, notice periods, and onboarding. If you need financial leadership now — for a fundraise, a board meeting, or an acquisition — a fractional CFO is the faster path.
A fractional CFO is the right choice when your company is between £300K and £5M ARR, you are preparing for a funding round or exit, you need investor-grade financial models and board packs, your bookkeeping is done externally but nobody is using the data strategically, or you want senior financial leadership without committing to a £150K+ salary. Most SaaS and tech founders find that a fractional CFO covers everything they need at this stage.
A full-time finance director becomes necessary when your company exceeds £5M in revenue, you have a finance team of 3 or more people who need daily management, you are operating across multiple entities or jurisdictions, or the volume of financial transactions and reporting demands a full-time presence. Many companies use a fractional CFO to bridge the gap until they reach this stage, and some continue using both — a finance director for operations and a fractional CFO for strategic projects.
Constantin Botnari is a Chartered Accountant and fractional CFO based in London, working exclusively with SaaS, AI and tech companies. ScaleWithCFO operates on a fixed monthly retainer with no day rates and no billable hours. If you are deciding between a fractional CFO and a finance director, book a free discovery call to discuss which option fits your business.
