Annual Recurring Revenue (ARR) is a non-GAAP key performance indicator (KPI) that represents annual recurring revenue and is calculated by multiplying the recurring revenue of the most recent month (MRR) by 12. The metric is widely used among high-tech companies, particularly those operating under a SaaS (Software as a Service) business model, whose revenues are subscription-based. ARR is considered a leading indicator for such companies, as it is intended to reflect the expected recurring revenue over the coming year from existing contracts.
Beyond its role as a managerial tool, ARR provides investors with an indication of the company’s growth potential and its ability to generate future revenues, which underscores its importance. ARR has also gained increased attention due to the revenue recognition challenges inherent in SaaS companies’ business models. In these companies, payments are typically received in advance, but under accounting standards revenue is recognized over the service period. As a result, reported accounting revenues reflect services rendered in the past, whereas ARR is calculated with a forward-looking perspective. Other commonly used metrics in such companies include Monthly Recurring Revenue (MRR), Average Revenue Per User (ARPU), Gross Merchandise Value (GMV), churn rate, and the number of paying subscribers.
The concept underlying ARR may appear straightforward, and its basic calculation seems simple; however, the method of calculation can vary from one company to another, depending, among other things, on the business model and management assumptions. A critical point regarding ARR is that it should be based solely on revenues expected to recur. Determining which revenues qualify as recurring is not trivial. In the case of the cybersecurity company SentinelOne, which in 2023 made a retrospective correction to the ARR figures it had previously reported to investors (leading to a renewed decline in its share price), the issue related to usage-based revenues. More broadly, numerous additional complex questions arise in this context. For example, how—and whether—to reflect short-term agreements and contract renewals, discounts granted to customers at the beginning of the term, cancellable contracts, upgrades and add-ons, customer churn rates, and other factors in the ARR calculation. In the absence of uniform rules for calculating ARR, the determination is left to management’s judgment and creativity, which in many cases tends to rely on lenient assumptions.