kellblog.com · 2016-03-17 · 3731d

CAC Payback Period: Understanding Risk vs. Return in SaaS Metrics

This article challenges common misunderstandings of CAC Payback Period (CPP), a critical SaaS metric that measures risk rather than return. The author explains that CPP is frequently misinterpreted, particularly regarding how annual/multi-year prepaid contracts affect payback calculations, and argues that companies must analyze both risk metrics (CPP) and return metrics (LTV) for proper SaaS business evaluation.

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Metrics in this report

CAC Payback Period

24months

example

CAC ratio 1.5, subscription gross margin 75%

CAC Payback Period

18months

example

CAC ratio 1.2, subscription gross margin 80%

CAC Payback Period

12months

example

CAC ratio 0.8, subscription gross margin 80%

CAC Payback Period

33.3months

calculated example

Monthly SaaS: $3,500 CAC, 70% gross margin, $150 monthly fee, 3% monthly churn

Monthly Churn

3%

example

High-churn monthly SaaS business scenario