Involuntary churn occurs when subscriptions are cancelled not because the customer wants to leave, but because a payment method fails and is not recovered. It is distinct from voluntary churn and can be significantly reduced through smart dunning and payment recovery strategies.

Example: A SaaS company loses 2.5% of its MRR each month to involuntary churn from failed credit card payments. By implementing smart payment retries and proactive card update reminders, it reduces this to 0.8%, recovering a significant portion of at-risk revenue.