Expansion revenue is the money you earn from customers you already have — through upsells, cross-sells, added seats, or higher tiers. It sits alongside new revenue and churn as one of the three levers that move MRR and ARR. In mature SaaS companies, expansion can be cheaper to win than new business, which is why account executives are increasingly measured on it.
In plain English
Expansion is selling more to the people who already trust you. It is easier than hunting because the relationship exists, but it still requires a real value proposition and follow-through. A company with strong expansion revenue grows without having to replace everything it loses to churn.
Why it matters to you
Expansion changes the shape of your job. If your quota includes expansion, your win rate and your pipeline look different than in a pure new-business role. Knowing how much of the number comes from existing customers tells you whether you are being hired to hunt or to farm — and it is one of the smartest questions you can ask about any account executive role.