Expansion Revenue
Definition
Expansion revenue is additional recurring revenue generated from customers you already have, through upsells, cross-sells, or growth in seats or usage, as opposed to revenue from acquiring new customers.
What is Expansion Revenue? Formula and How to Grow It
Expansion revenue is what makes negative churn possible: when upgrades from existing customers outpace the revenue lost to cancellations, your MRR grows even if you stopped selling to anyone new.
Formula: Net Revenue Retention = (Starting MRR + Expansion MRR - Contraction MRR - Churned MRR) / Starting MRR
Example: You start the month with $100,000 MRR. Existing customers upgrade plans and add seats for $12,000 in expansion revenue. Downgrades and cancellations cost you $5,000. NRR = ($100,000 + $12,000 - $5,000) / $100,000 = 107%.
Common expansion levers: usage-based pricing that grows automatically as customers do more (Twilio, Snowflake), seat-based pricing where adoption spreads within an account (Slack), and tiered plans that unlock more value as usage grows (feature gates, higher limits).
Expansion revenue is cheaper than new revenue: there's no CAC to acquire the customer again, since they're already a customer. That's why land-and-expand, starting small inside an account and growing the footprint over time, is the default GTM motion for most B2B SaaS companies today.
Examples
Slack starts inside one team of 10 people on a free plan. As adoption spreads to other departments, the account grows to 200 paid seats over a year, all without a single new logo, entirely expansion revenue from one account.