What Is Annual Recurring Revenue (ARR)?
Annual Recurring Revenue normalises your subscription income to a 12-month view, making it easier to track growth, set targets, and compare periods.
Key Takeaways
- ARR = MRR × 12 for monthly-billed customers
- ARR excludes one-off fees and professional services
- Use ARR for board reporting and annual planning; MRR for month-to-month operations
- Track new ARR, expansion ARR, churned ARR, and net new ARR separately
What ARR measures
Annual Recurring Revenue (ARR) is the value of your contracted, recurring subscription revenue normalised to one year. For a SaaS business billing monthly, ARR = MRR × 12. For customers on annual contracts, ARR is simply the contracted annual value. ARR is a snapshot metric — it tells you what your business would generate in the next 12 months if nothing changed. It excludes one-off implementation fees, professional services, and usage overages unless those overages are contracted minimums.
ARR vs MRR: when to use each
MRR is the operational heartbeat — useful for tracking month-to-month momentum, spotting churn early, and setting monthly sales targets. ARR is the strategic view used in board decks, fundraising conversations, and annual planning. If your contracts are predominantly annual, ARR is more natural. If most customers pay monthly, MRR is more precise for operations and ARR is a derived planning number. Avoid mixing contract lengths carelessly — an annual contract worth £12,000 is £12,000 ARR, not £1,000 MRR × 12, if the customer is locked in.
Decomposing ARR movements
Healthy ARR reporting breaks movement into four buckets: new ARR (from brand-new customers), expansion ARR (upsells and cross-sells to existing customers), contraction ARR (downgrades), and churned ARR (cancellations). Net new ARR = new + expansion − contraction − churn. Tracking these separately tells you whether growth is coming from acquisition, expansion, or simply retention — each requiring a different response from the business.
Common mistakes
The most frequent ARR errors are including non-recurring revenue (setup fees, consulting) and annualising short-term contracts that are unlikely to renew. Both inflate ARR and mislead planning. A second trap is reporting ARR on a booking date rather than a start date — revenue should enter ARR when the contract goes live, not when the deal is signed. For SMEs, keeping a simple ARR log updated monthly is usually sufficient before investing in dedicated revenue recognition software.