THE SHORT ANSWER
Churn is the loss of customers, accounts or recurring value under a stated definition. Inactivity describes an absence of expected behaviour; lapse is often used for a missed expected return; cancellation is an explicit end; reactivation or win-back occurs when an inactive or former customer returns.
Name the event and denominator
| State | Subscription example | Transactional example |
|---|---|---|
| Inactivity | No meaningful use while still subscribed | No visit or purchase in an expected window |
| Lapse | Payment or renewal window missed | Expected reorder did not occur |
| Cancellation | Customer explicitly ends the plan | Order cancelled; not necessarily customer loss |
| Churn | Account or recurring revenue lost | Customer classified lost under a stated rule |
| Reactivation | Former account becomes active again | Customer returns after the inactivity threshold |
| Win-back | Deliberate effort contributes to return | Targeted intervention precedes an eligible repeat purchase |
Use the natural customer rhythm
Subscription churn can have a clear billing event, although voluntary and failed-payment churn differ. Transactional businesses must infer when a customer is late relative to category, individual cadence and opportunity. A universal 30-, 60- or 90-day rule can misclassify normal behaviour.
State whether the metric uses customer count, recurring revenue, orders or activity. Each answers a different question.
Do not pursue every inactive customer
- Suppress people who opted out or should not be contacted.
- Exclude customers with unresolved complaints until service owns the response.
- Consider whether the need is naturally complete.
- Estimate value after incentive and service cost.
- Use a relevant reason to return, not escalating pressure.
- Allow the customer to say no and update preferences.
Treat return as evidence, not proof
Measure eligible customers, contact, response, reactivation, subsequent value, complaints and incentive cost. A returning customer may have come back without the campaign; where stakes justify it, use a holdout or other incrementality design.
For measurement depth, use cohort analysis and experimentation.
Sources & further reading
- Retention overview report
Google Analytics Help. Official documentation for GA4 retention cohorts and engagement. Its fixed reporting windows may not match a product's natural purchase or usage cycle.
- Marketing Plan Progress Using Metrics
OpenStax, Rice University. Open educational material covering marketing metrics, acquisition cost and customer value. Formula inputs and decision thresholds must be defined for the actual business model.
Examples and exercises are illustrative unless attributed to a source. No independent expert review is claimed.
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