What is expansion revenue?

Written by Madalena Rugeroni, founder of Mazo · Updated 10 November 2026

Expansion revenue is the additional recurring revenue you earn from existing customers through upgrades, extra seats or usage, add-ons and price increases. It's the part of net revenue retention that can push it above 100%.

Expansion revenue formula

Expansion MRR = upgrade MRR + added seats or usage MRR + add-on MRR + price increase MRR Expansion rate = expansion MRR in the period ÷ MRR at the start of the period × 100

Only count recurring revenue from customers who were already paying at the start of the period. One-time fees and new customers stay out.

Worked example

A fictional SaaS starts the month at €40,000 MRR from existing customers.

6 customers upgrade a tier (+€1,500), 11 add seats (+€1,100), 3 buy an add-on (+€400).
Expansion MRR = €3,000. Expansion rate = 3,000 ÷ 40,000 = 7.5% for the month.
The same month, churn and downgrades cost €1,800, so net retention from existing customers is (40,000 + 3,000 − 1,800) ÷ 40,000 = 103%.

Why it matters from €0 to €1M ARR

First customers: design a value metric that grows with the customer, so expansion can happen without a sales conversation.
€10k+ MRR: report expansion separately from new revenue, and look at which customers expand to sharpen your ICP.
Approaching €1M ARR: expansion becomes the cheapest growth you have, because there's no acquisition cost.

Mazo's rule of thumb: if no customer has ever paid you more than they did in month one, your pricing has no room to grow. Fix packaging before you spend more on acquisition.

Common expansion revenue mistakes

Netting it against churn. Report expansion, contraction and churn separately so you can see each one move.
Counting new customers' first month. That's new revenue.
Pushing upgrades on unhealthy accounts. Expansion on a customer about to churn just raises your churn later.
A flat price with no tiers or usage. There's nothing for a growing customer to expand into.

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Willingness-to-Pay Test

Price increases on existing customers count as expansion too. Test what customers will pay before you change it.

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FAQ

What counts as expansion revenue?

Recurring revenue gained from existing customers: tier upgrades, extra seats or usage, add-on products and price increases. One-time fees and revenue from new customers do not count.

What is the difference between expansion revenue and net revenue retention?

Expansion revenue is one input. Net revenue retention combines it with churn and downgrades to show whether revenue from existing customers grew or shrank overall.

What is the difference between upselling and cross-selling?

Upselling moves a customer to a higher tier or more of the same product. Cross-selling adds a different product or add-on. Both create expansion revenue.

Who wrote this

Madalena Rugeroni built Mazo. She's an ex-Googler, a startup advisor and investor, and runs a portfolio of internet companies. Before that, as Head of Growth at Amplemarket, she scaled a B2B SaaS to $10M ARR. LinkedIn

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