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.
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