SaaS Metrics

Software-as-a-Service economics are defined by recurring revenue retention and cohort velocity. Managing SaaS operations requires tracking Annual/Monthly Recurring Revenue (ARR/MRR) movements, calculating Net Revenue Retention (NRR), applying ASC 606 revenue recognition, and benchmarking against the Rule of 40.

1. The ARR / MRR Waterfall Architecture

Recurring revenue must be decomposed into five discrete, reconcilable movements: $$\text{Ending ARR} = \text{Beginning ARR} + \text{New ARR} + \text{Expansion ARR} - \text{Contraction ARR} - \text{Churned ARR}$$

• New ARR: Revenue from newly closed customer accounts.
• Expansion ARR: Additional revenue from existing accounts (seat expansions, tier upgrades, cross-sells).
• Contraction ARR: Revenue lost from existing customers downgrading tiers or reducing seats without fully churning.
• Churned ARR: Total revenue lost from customers cancelling contracts completely.

2. Retention Metrics: NRR vs. GRR

Retention is the single greatest predictor of software enterprise valuation: