Additional recurring revenue earned from existing customers through upgrades, add-ons, and seat increases.
Expansion MRR = Σ MRR increases from existing customers (upgrades + add-ons + seat growth) in period
In a month, 8 customers upgrade adding £25/mo each, and 4 add seats worth £50/mo each.
(8 × £25) + (4 × £50) = £200 + £200 = £400 expansion MRR
Expansion MRR is the revenue growth that comes from customers you already have — upgrading to a higher tier, buying add-ons, or adding seats. It does not include new customers; that is new MRR.
Expansion is the cheapest revenue you can earn. You have already paid to acquire and onboard the customer, so incremental revenue from them carries no new acquisition cost. This is why expansion-led businesses tend to be so capital-efficient.
Expansion MRR is what pushes net revenue retention above 100% and drives a negative net revenue churn. A business that systematically grows accounts over time can outgrow its churn without signing a single new logo.
Expansion revenue is the engine behind the best SaaS businesses. Because it requires no new acquisition spend, it lifts margins, raises lifetime value, and is the primary lever for getting net revenue retention above 100% — the point at which your base grows on its own.
In high-performing SaaS, expansion can account for 20–30%+ of new MRR each month and is what drives NRR above 100%.
Any recurring revenue increase from existing customers — tier upgrades, add-on purchases, and seat increases. New customer revenue is new MRR, not expansion.
Expansion is the main driver of NRR above 100%. When expansion from existing customers outweighs downgrades and churn, your existing base grows revenue on its own.
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