Durable MRR
The revenue still standing a year from now at today's churn — the conservative floor beneath your MRR.
What is it?
Durable MRR is the portion of your current revenue that would still be standing a year from now at your current churn rate — the conservative floor beneath your headline MRR, before any new business at all.
It answers a sobering question: if you signed no one new, how much of today's revenue survives twelve months? The gap between MRR and durable MRR is exactly the revenue your churn will quietly remove if nothing changes.
How to calculate?
Apply your annual retention rate to current MRR: durable MRR is current MRR multiplied by the share expected to survive a year at the current churn rate. Higher churn shrinks the durable floor even when headline MRR looks strong.
Use it to pressure-test forecasts: any plan that assumes today's MRR simply carries forward is ignoring the difference between MRR and its durable core.