Part-Time CFO for UK SaaS & Tech Companies
Not every growing SaaS company needs a full-time CFO - but every one needs CFO-level thinking. Here is what a part-time CFO should actually deliver each month, what it costs in the UK, and how to tell whether the model fits your stage.
- Price £2K-£5K per month fixed retainer, no day rates, no equity, no recruitment fees
- Scope Strategic financial leadership, monthly board reporting, fundraising support. Not day-to-day bookkeeping.
- Terms Month-to-month with 30-day notice. Founder-led and direct - the CFO you speak to is the CFO who does the work.
- Best for UK SaaS founders at £500K to £5M ARR with growing finance complexity
Part-Time, Fractional or Interim CFO - Which One Are You Looking For?
Most providers use these labels interchangeably, so what really matters is who does the work and how you pay for it.
If you need cover for a departure or a defined transition, see interim CFO support. If you are comparing provider types - network firms, boutique teams and direct specialists - start with how to choose a fractional CFO in the UK. If the operational side is the priority - management accounts, controls and the month-end close - see our fractional finance director service.
What a Part-Time CFO Should Actually Deliver
A part-time CFO will not run your payroll or file your VAT returns. What they should do is make sure the numbers are accurate and then turn them into decisions. Use this as the checklist for any provider you are evaluating - including us:
If you are not getting this level of support from your current arrangement, it is time to rethink what you are paying for. For a second opinion, book a 15-minute call and we will walk through this checklist against your current setup.
What a Part-Time CFO Costs in the UK
Across the UK market, part-time and fractional CFO retainers run from £1,500 to £8,000 per month depending on scope and seniority, and providers who still bill by the day charge £800 to £2,000 per day. A full-time CFO costs £150,000 to £300,000+ once salary, employer NI, pension and recruitment fees are included.
ScaleWithCFO charges a fixed monthly retainer of £2,000 to £5,000, all-in, no day rates - the price reflects business complexity, not feature access. The full breakdown with worked examples from Pre-Seed to Series A is in the fractional CFO cost guide, and full-time salary benchmarks are in the CFO salary UK guide.
Why Ongoing Support Beats Paying for Days Per Week
Most part-time CFOs sell a fixed number of days per week, but your finance questions do not arrive on a schedule.
- Predictability - a fixed monthly fee, with no surprise invoice when a busy month needs more attention
- Responsiveness - questions answered when they arise, not parked until the next booked day
- Continuity - the same CFO carries your context month after month, so answers get faster and better over time
- Flexibility - intensity scales up around a fundraise or year-end without renegotiating day counts
The difference shows during a fundraise. Investor questions land daily for six weeks - on a day-count model each one waits for the next scheduled day or bills extra, while on ongoing support the answer goes back the same day at no extra cost. Day-based cover still makes sense for defined one-off projects like a model build or a due diligence sprint - the cost guide covers when each model fits.
Signs Your SaaS Company Needs a Part-Time CFO
- You have no monthly forecast, or your forecast is wildly inaccurate
- You are surprised by your bank balance at month-end
- You do not know your unit economics - CAC, LTV, churn - and your financial statements are always late or missing
- You are approaching a funding round and your board is asking for monthly reporting you cannot produce
- Investors are asking about unit economics and you are making it up
- You cannot quickly answer what your runway is or how much you are burning
- You are considering a major hire and do not know if you can afford it
- Your founder is spending 20+ hours per week on financial admin instead of growth
If three or more of these sound familiar, it is worth a conversation - book a call and we will tell you honestly whether you need a CFO yet.
What's Included
Cash Flow Forecasting & Financial Planning
13-week rolling cash flow forecasts, driver-based budgets, and scenario planning tied to your actual growth levers. Know your runway and the cash impact of every decision before you make it.
Fundraising & Due Diligence
Investor-ready three-statement models, data room preparation, and full due diligence support. We build models grounded in real MRR and churn data that investors can trust.
Monthly Management Accounts & Board Packs
Accurate monthly reports with P&L commentary, SaaS KPI dashboards, runway analysis, and video walkthroughs. Delivered by the 15th, designed to be read in under ten minutes.
Financial Review & Data Cleanup
Chart of accounts restructured to SaaS standards, revenue recognition reviewed against IFRS 15, and a full financial health check before any major milestone.
Cash Flow & Profitability Improvement
Unit economics breakdown by channel and cohort, margin analysis, expense reviews, and pricing strategy. Find where money leaks and fix it before it becomes a problem.
Exit Planning & Preparation
Quarter-by-quarter planning to hit your target valuation. Clean financials, defensible projections, reduced founder dependence, and a data room ready for due diligence.
How ScaleWithCFO Runs the Engagement
Founder-led and direct - the CFO you speak to is the CFO who does the work. Engagements run on a fixed monthly retainer with ongoing support and direct calendar access: intensity flexes up around fundraising, board cycles and year-end, and eases back when things are steady. Scope and fees are agreed in writing after a discovery call and access to your financials, on month-to-month terms with 30-day notice. Delivery is fully remote across the UK.
The first two weeks are discovery: P&L, balance sheet, cash position, what reports exist and what is missing. Months one and two build the foundation - chart of accounts restructured, your first proper monthly financial package, the 8 to 12 KPIs that matter for your business, and historicals cleaned up so the numbers can be trusted.
No day rate
Fixed monthly retainer covers everything. No billable hours, no surprise invoices.
SaaS/AI specialist
We work exclusively with SaaS, AI and tech companies. Deep expertise in MRR, ARR bridges, and investor language.
Hands-on
We restructure your chart of accounts, fix your gross profit margin, and build the models ourselves - not just advise.
Frequently Asked Questions
A part-time CFO provides senior, strategic finance leadership: cash flow forecasting, financial modelling, board reporting, budgeting, fundraising support, and exit preparation. At ScaleWithCFO this is ongoing support with direct calendar access - founders book strategic calls and catch-ups as the business needs them, rather than billing a fixed number of days per week or month.
A part-time CFO provides the same strategic expertise as a full-time CFO on a fixed monthly retainer. You get ongoing access to senior finance leadership for cash flow, fundraising, board reporting, and exit planning - without the salary, equity, recruitment risk, or notice period of a permanent hire.
Most SaaS companies benefit from a part-time CFO once they have clear product-market fit, are preparing to raise funding, or are outgrowing founder-led finance. At this stage you need financial strategy, investor-ready models, and proper cash flow planning.
A bookkeeper records past transactions, reconciles accounts, and prepares basic financial records. A part-time CFO drives forward-looking strategy: financial planning, forecasting, fundraising, pricing decisions, and helping founders make better business decisions.
With day-based support, every question waits for the next booked day or bills extra. With ongoing support on a fixed retainer, questions are answered when they arise, the cost is predictable, and the CFO's knowledge of your business compounds month after month. Day-based cover suits defined one-off projects; ongoing support suits running a business, where finance questions do not arrive on a schedule.
Most engagements start around a trigger - a fundraise, messy financials, or a board asking for proper reporting - and then run for 2-3+ years as ongoing support. Terms are month-to-month with 30-day notice: intensity is highest in the first few months while the foundation is built, then settles into a steady monthly rhythm.
Everything in the deliverables checklist: monthly management accounts and board pack, a 12-month cash flow forecast updated monthly, budgeting across three scenarios, fundraising and exit support, and fast answers to day-to-day questions. There is no feature gating by price band - the retainer reflects business complexity, not access.
Ready to get your finances under control?
Free 15-minute call. No obligation - just a straight conversation.