Fractional CFO for SaaS | UK

Your SaaS fractional CFO.
Clarity behind the growth.

Know what is growing, what is sticking and what the business needs in cash to deliver the plan.

Consult EFC supports SaaS founders and management teams with financial leadership across reporting, forecasting, unit economics and funding readiness. We connect subscription data to the accounts and the operating plan, so the metrics can stand up to questions.

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See the thinking behind the service

SaaS Fractional CFO

A SaaS fractional CFO provides senior financial leadership around the economics of a subscription business. The work connects recurring revenue, customer retention, delivery costs, hiring and cash to management, board and funding decisions.

The service

What does a SaaS fractional CFO do?

A SaaS fractional CFO provides senior financial leadership around the economics of a subscription business. The work connects recurring revenue, customer retention, delivery costs, hiring and cash to management, board and funding decisions.

The SaaS finance challenge

Growth needs an explanation.
Not just a bigger chart.

01

MRR grows while cash tightens

Bookings, subscription metrics, accounting revenue, invoices and collections describe different things. Explain how contract terms, billing and costs connect the growth story to the bank balance.

02

Retention hides the customer story

A single retention percentage can conceal contraction, expansion or a concentration issue. Review cohorts, customer segments and the basis of recurring revenue before interpreting the trend.

03

The plan depends on assumptions nobody owns

Sales productivity, churn, implementation capacity and hiring need identifiable owners. A forecast becomes more useful when those assumptions can be challenged and updated.

Leadership and delivery

A financial view across
the subscription engine.

01

Recurring revenue reporting

Create a defined opening-to-closing MRR or ARR bridge, distinguishing new customers, expansion, contraction, churn and other movements. Reconcile the reporting population and document exclusions.

02

Retention and customer economics

Review gross and net revenue retention, cohorts, customer concentration and acquisition economics. Make time periods and denominators explicit so management can compare like with like.

03

Gross margin and delivery costs

Separate recurring delivery from implementation, professional services and other activities where appropriate. Consider hosting, support, compute and data costs consistently across periods.

04

Cash runway and funding requirements

Connect collections, annual prepayments, payroll, investment and working capital. Test downside cases and identify when decisions or additional funding would be required.

05

Planning and commercial decisions

Assess pricing, discounts, product mix, hiring and sales capacity. Challenge the cash and contribution assumptions behind growth targets.

06

Board and investor support

Build a coherent reporting pack, financial model and explanation of performance. Support questions with traceable evidence and a clear account of risks.

Explore the detail

What is retention really telling you?

Explore a simplified recurring revenue bridge. Amounts use one consistent reporting period and currency. New customer revenue is deliberately excluded from retention.

Net revenue retention

110.0%

Gross revenue retention

90.0%

Closing revenue from opening cohort

£110,000

NRR = (opening + expansion − contraction and churn) ÷ opening. GRR excludes expansion. Inputs must use the same cohort and period; losses cannot exceed opening revenue. This simplified example excludes currency effects and other adjustments.

Definitions before dashboards

ARR is a metric.
It is not your bank balance.

Define which recurring contracts qualify for ARR and how discounts, usage, pauses, cancellations, currency and one-off services are treated. Multiplying a monthly snapshot by twelve is meaningful only when the underlying basis suits the business.

Accounting revenue follows the applicable accounting requirements and the substance of contracts. Billing and cash collection follow payment arrangements. We work with your accountant so operational metrics and accounting information can be explained together.

For AI and data products, usage, compute commitments and implementation intensity may change the economics. Avoid forcing a consumption-led or service-heavy product into a pure subscription framework simply because the company is called SaaS.

A useful reporting pack

Explain the movements.
Then decide what to change.

01

Growth and retention

A recurring revenue bridge with customer and cohort context, supported by a documented metric dictionary and consistent reporting dates.

02

Margins and acquisition economics

A view of delivery contribution, sales and marketing investment and customer economics. Cost allocations, time windows and limitations are visible.

03

Cash and forward decisions

Actual performance against plan, updated cash visibility, scenarios and a short action list with accountable owners.

Make the model operational

The sales plan has a cost.
The cash forecast should show it.

Build the forecast from the way customers are acquired, onboarded, billed and retained. Link headcount to capacity and delivery requirements. Then distinguish contracted revenue, pipeline assumptions and management ambition.

A sales delay can affect subscription growth, implementation income and collection timing at different points. A larger annual contract may improve short-term cash while creating a continuing delivery obligation. Those effects belong in the same decision model.

We can combine ongoing CFO support with a defined investor-facing modelling project or fundraising readiness engagement. A valuation requires a separate purpose and scope; explore SaaS business valuations.

Getting started

Agree the definitions.
Build the decision rhythm.

Understand the model

Review subscription, usage and service revenue, contracts, billing arrangements and the decisions management needs to make.

Connect the source data

Assess accounts, billing and CRM information. Identify reconciliations, metric definitions and gaps in reporting ownership.

Prioritise the outputs

Agree the reporting pack, cash forecast, model and support needed. Define responsibilities, fee, VAT treatment and availability.

Review and act

Explain performance, challenge assumptions and track actions through the agreed management cycle.

Read further

Useful thinking for
your next decision.

Your questions

SaaS Fractional CFO, explained.

What does a fractional CFO do for a SaaS company?

The role connects subscription performance, retention, delivery economics, cash, planning and stakeholder decisions. The exact responsibilities depend on the company, its internal team and the agreed engagement.

Can you reconcile ARR with accounting revenue?

We can help explain the relationship and investigate differences using contract, billing and accounting information. ARR is an operational metric and is not automatically recognised accounting revenue. Your accounting policies and applicable requirements still apply.

What is the difference between NRR and GRR?

Net revenue retention measures the recurring revenue retained from an opening customer group after expansion, contraction and churn. Gross revenue retention excludes expansion. Both require consistent definitions and time periods; new customer revenue is excluded.

Do you work with AI or usage-based SaaS businesses?

Yes. We adapt the financial work to subscription, consumption and service components, including compute and data costs. The reporting basis should reflect the commercial model rather than assume all revenue behaves like a fixed subscription.

Can you build our fundraising model?

Yes, as a defined workstream or separate project. We connect the operating drivers, cash needs, scenarios and funding assumptions, and agree the outputs and investor questions the model needs to address.

Will you guarantee funding?

No. Financial preparation and CFO support can improve the evidence and clarity of a funding discussion. Investment decisions, terms and timing remain with investors and the company.

How much do SaaS CFO services cost?

Fees reflect the scope, reporting complexity, data readiness, time commitment and support required. Deliverables, availability, VAT treatment and any additional project work are agreed before starting.

Are you only for SaaS companies?

Consult EFC is sector agnostic. This page describes our SaaS-specific work. Our wider fractional CFO service supports technology, AI, data businesses and established SMEs across other sectors.

Work directly with the adviser

Bring the decision.
We will help frame the work.

Tell us what is changing, what you need to achieve and any important deadline.

Kishen Patel leads Consult EFC engagements. He is an ICAEW Chartered Accountant with a background in Big Four audit, investment banking and corporate advisory. Consult EFC has advised 100+ businesses and remains sector agnostic.

We agree the scope, deliverables, responsibilities, fee, VAT treatment and timing before work starts. An introductory conversation does not commit you to an engagement.