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CAC Payback Period (also called Time to Recover CAC) measures how many months of gross profit from a customer are needed to recover the cost of acquiring them.
Formula
Payback (months) = CAC ÷ (Monthly ARPU × Gross Margin %)
Why use gross margin, not revenue?
COGS must be covered before a customer is profitable. Using revenue inflates the apparent payback speed — use gross margin to get an accurate picture.
Benchmarks by company type
| Payback | Assessment |
|---|---|
| < 6 months | Exceptional — very capital-efficient |
| 6–12 months | Strong — standard VC benchmark |
| 12–18 months | Acceptable for enterprise SaaS |
| 18–24 months | Requires high LTV to justify |
| > 24 months | High risk — needs high retention |
CAC Payback vs LTV:CAC
LTV:CAC looks at the total lifetime return. CAC Payback focuses on capital efficiency: how quickly does each customer dollar pay you back? A company with 24-month payback needs 2 years of capital before each cohort turns profitable.
How to improve CAC Payback
- Increase ARPU through pricing tiers or usage-based pricing
- Improve gross margin (reduce COGS)
- Reduce CAC through SEO, PLG, or referral programs
- Shorten sales cycles