What is churn?

Churn measures customers or recurring revenue that is lost.

For SaaS teams, churn usually appears when a subscription is cancelled, fails to renew, downgrades, or stops paying. Churn is one of the most important quality checks for growth because it tells you whether customers stay.

Customer churn vs revenue churn

Customer churn measures lost accounts.

customer churn = lost customers / starting customers

Revenue churn measures lost recurring revenue.

revenue churn = lost recurring revenue / starting recurring revenue

These can tell different stories. Losing one large account can create low customer churn and high revenue churn. Losing several small accounts can create high customer churn and low revenue churn.

Gross churn vs net churn

Gross revenue churn counts lost recurring revenue from cancellations and downgrades.

Net revenue churn subtracts expansion from retained customers. If existing customers upgrade enough to offset lost revenue, net revenue churn can be negative.

Negative net revenue churn is usually a strong SaaS signal, but it should not hide acquisition quality. A channel that creates customers who churn quickly may still be expensive even if the whole business expands.

Why churn needs attribution

Most acquisition reports stop at signup or first payment. That can make weak channels look strong.

Churn attribution connects lost revenue back to the original source, campaign, landing page, or signup path. It helps answer:

• Which channels create customers who stay?
• Which campaigns create refunds or cancellations?
• Which landing pages attract low-fit accounts?
• Which sources expand after signup?

This matters because revenue quality is not visible in traffic reports.

Common churn reporting mistakes

Avoid these mistakes:

• Mixing customer churn and revenue churn.
• Treating failed payment retries as immediate churn without a policy.
• Ignoring downgrades.
• Looking only at first-month churn.
• Reporting churn without source, plan, or cohort.

Churn should be connected to the same acquisition data used for signup and revenue reports.

Next steps

Read signup-to-paid funnel tracking to keep churn connected to the funnel. Use Stripe webhook revenue events to normalize cancellations, refunds, renewals, and subscription changes.