Expansion Revenue
Additional revenue earned from existing customers through upsells, cross-sells, or plan upgrades. Expansion revenue is a key driver of net revenue retention above 100%.
What Is Expansion Revenue?
Expansion revenue (also called expansion MRR) is additional revenue earned from existing customers beyond their original subscription value. It comes from upsells (upgrading to a higher plan), cross-sells (adding complementary products), seat expansions (adding more users), and usage-based overages. Expansion revenue is the primary driver of net revenue retention above 100%.
How to Measure Expansion Revenue
Expansion MRR = Current MRR from Existing Customers - Their MRR at Start of Period
Only count revenue increases from customers who were already paying at the start of the period. New customers are counted in New MRR, not expansion. Track expansion rate as a percentage: Expansion Rate = Expansion MRR / Starting MRR x 100.
Why Expansion Revenue Matters More Than Acquisition
Acquiring a new customer costs 5-25x more than expanding an existing one. Companies with strong expansion revenue can grow even if new customer acquisition slows. The best SaaS companies generate 30-50% of their new revenue from expansion. This is why net revenue retention above 100% is considered the hallmark of a great SaaS business.
