Components of the annual revenue bridge
The ARR bridge is a waterfall visualization that decompose year-over-year revenue change into five distinct components. Start with the previous year's annual recurring revenue (base ARR). Then add new customer revenue (net new ARR from customers who were not customers the prior year). Add expansion revenue from existing customers who increased their spending via upsells, add-ons, or usage-based acceleration. Subtract contraction revenue from existing customers who downgraded. Subtract churn revenue from customers who canceled entirely. The ending ARR is the sum of these five components. This bridge reveals where growth is coming from and where leakage occurs. Many companies find that strong new customer acquisition can mask a deteriorating base of existing customers if churn and contraction are rising.
Diagnosing unit economics health
The ARR bridge is a diagnostic tool. A company with steady expansion and low churn shows a bridge that widens year over year. A company with declining expansion and rising churn shows a bridge that narrows despite new customer wins. The ratio of expansion to churn (net expansion rate) reveals customer satisfaction and pricing power. Companies with a net expansion rate above 120 percent (expansion revenue exceeds contraction and churn combined) have customers buying more over time. Below 100 percent, the base is eroding faster than it is growing, a warning sign even if new logos are strong. SaaS companies often optimize for one component at a time (e.g., focusing on new customer acquisition one quarter, expansion the next), but disciplined analysis of the bridge shows what dimension needs attention.