SaaS (Software as a Service)

An umbrella term for the broad range of services delivered over the internet on a subscription basis, encompassing Software as a Service, Platform as a Service, Infrastructure as a Service, and numerous specialised variants. XaaS business models convert capital expenditure into operating expenditure for customers and derive the majority of their enterprise value from intangible assets including recurring customer relationships, proprietary platforms, and data.

The set of key performance indicators specifically designed to measure the health, growth, and unit economics of Software-as-a-Service businesses. Core SaaS metrics include annual recurring revenue (ARR), monthly recurring revenue (MRR), customer acquisition cost (CAC), lifetime value (LTV), churn rate, net revenue retention (NRR), and the Rule of 40.

The annualised value of recurring subscription revenue. ARR is the primary top-line metric for SaaS and subscription businesses, providing a normalised view of predictable revenue that strips out one-time fees and variable charges.

The percentage of recurring revenue retained from existing customers over a period, excluding any expansion revenue. GRR isolates the impact of churn and contraction and can never exceed 100%.

An intangible asset representing the value embedded in a company's established customer base, including contracts, loyalty, and recurring revenue. Under IFRS 3, customer relationships are separately identified and measured at fair value during purchase price allocations, typically using the Multi-Period Excess Earnings Method (MPEEM) which projects cash flows from the existing customer base over its expected attrition period.

The proportion of available capacity — whether labour hours, machine time, or service capacity — that is actually deployed in productive activity. Utilisation rate is a key productivity metric for professional services, manufacturing, and SaaS infrastructure, directly influencing revenue efficiency and operating margins.

An economic model in which businesses generate recurring revenue by providing ongoing access to products or services rather than one-time sales. The subscription economy elevates the importance of intangible assets such as customer relationships, brand trust, and product stickiness, which together determine retention and lifetime value.

A performance benchmark for SaaS and subscription businesses stating that the sum of revenue growth rate and profit margin should equal or exceed 40%. The Rule of 40 balances growth and profitability and is widely used by investors to assess whether a company is creating sustainable enterprise value.