A fractional CFO is an experienced Chief Financial Officer who works with your business on a part-time basis — typically one or two days per week — rather than as a full-time hire. You get strategic financial leadership, board-level reporting, and hands-on finance expertise at a fraction of the cost.
For SaaS and AI businesses between £0.3M and £10M ARR, a fractional CFO is often the ideal solution. You need someone who understands subscription economics and investor expectations, but don't yet have the budget or need for a full-time hire.
Records transactions and keeps your books up to date. Tells you what happened.
Handles compliance — tax returns, statutory accounts, and regulatory filings. Makes sure it's compliant.
Works at a strategic level: modelling, forecasting, board reporting, SaaS metrics, and fundraise prep. Tells you what it means and what to do next.
"Your bookkeeper tells you what happened, your accountant makes sure it's compliant, and your fractional CFO tells you what it means and what to do next."
Most SaaS businesses benefit from a fractional CFO once they reach £0.3M to £0.5M ARR and face decisions about scaling, fundraising, or international expansion.
You're preparing for a funding round and need your numbers, forecasts, and data room in shape.
Your board or investors are asking for more sophisticated reporting than your bookkeeper can provide.
You're expanding internationally and need to understand multi-entity structures, transfer pricing, and cross-border tax.
You're growing fast but don't have clear visibility on unit economics, cash runway, or profitability by segment.
You need someone to build the financial infrastructure that will support your next stage of growth.
Yes. Fundraise preparation is one of the most common reasons SaaS founders bring in a fractional CFO. Having a qualified, experienced CFO alongside you during the fundraise process significantly strengthens your credibility with investors. Each of these steps is handled end-to-end, ensuring your business is presented in the most compelling and credible light possible.
Build model with clear assumptions
Calculate ARR, MRR, GRR, NRR, LTV, CAC
Support Q&A and provide financial detail
Validate forecasts and unit economics
Prepare clean, investor-ready data room
SaaS Scaler embeds directly into your business as a core part of your team, with one or two dedicated days per week. This includes joining your Slack, working in your accounting and reporting systems, attending board meetings, and working alongside your existing finance team.
Engagements begin with foundations — cleaning up reporting and building a SaaS P&L structure — before moving to growth: 5-year forecasts, cohort analysis, KPI dashboards, and strategic finance work.
Investor-backed SaaS and AI businesses between £0.3M and £10M ARR scaling internationally. Clients are typically:
- VC or PE-backed
- Operating across multiple currencies and jurisdictions
- Facing the specific financial challenges of subscription businesses
Currently working with 3 clients ranging from £200K ARR to £6M ARR.
SaaS Scaler is led by Kirsten Munn, a highly qualified finance professional with deep expertise in SaaS and AI businesses.
Chartered accountancy qualification from the Institute of Chartered Accountants in England and Wales.
Certified Public Accountant qualification, enabling cross-border financial expertise across UK and US markets.
Certification from the Financial Modelling Institute — the gold standard for financial model construction.
Big 4 training at EY, KPMG, and Deloitte. International roles in Tokyo and the US. Senior finance positions in PE and VC-backed SaaS scale-ups.
The right metrics depend on your stage and what decisions you're making. A fractional CFO can help you identify which metrics matter most and ensure they're calculated consistently and reported clearly.
A SaaS P&L restructures your management accounts to reflect how a subscription business actually works. Instead of a generic income statement, it:
- Separates revenue by type — recurring vs. non-recurring
- Groups costs by function — cost of revenue, sales and marketing, R&D, and G&A
- Calculates key margins like gross margin and operating margin
Investor Expectations: Investors, board members, and potential acquirers expect to see your financials in this format. It signals financial maturity and credibility.
Profitability Clarity: It gives you much clearer visibility into what's driving your profitability and where to invest for maximum return.
Fractional CFO fees vary based on scope, complexity, and time commitment. The key comparison point is against a full-time CFO hire.
£150K – £250K+ per year including benefits and equity. A significant overhead for a business up to £10M ARR.
Significantly less than a full-time hire, while delivering senior-level strategic finance expertise tailored to your stage.
It's straightforward. Here's what happens when you reach out:
No commitment required. Just a conversation about your business.
We'll talk about where you are now and what financial infrastructure you need to reach the next stage.
If there's a good fit, you'll receive a clear proposal with milestones and expected outcomes.
SaaS Scaler works with investor-backed SaaS and AI founders who are serious about building the financial infrastructure to support their next stage of growth. If you have up to £10M ARR and are facing decisions about fundraising, international expansion, or scaling — let's talk.
Board reporting, financial modelling, and SaaS metrics that give you and your investors full confidence.
Data rooms, investor-ready forecasts, and a qualified CFO by your side throughout the process.
Multi-entity structures, transfer pricing, and cross-border tax expertise for global SaaS businesses.
Common questions about fractional CFO services, SaaS finance, and working with SaaS Scaler — answered clearly.