What Is CAC Payback Period?
CAC payback period is the number of months it takes to recoup the cost of acquiring a customer from the gross margin they generate. It measures how quickly acquisition spend pays for itself — a shorter payback means more capital-efficient growth and less cash tied up in acquisition.
Key takeaways
- CAC Payback (months) = CAC ÷ (monthly revenue per customer × gross margin %).
- Under ~12 months is generally healthy for B2B SaaS.
- Shorter payback means more capital-efficient growth.
How to calculate it
CAC Payback = CAC ÷ (Monthly Revenue per Customer × Gross Margin %)
Result is the number of months to recover acquisition cost.
Worked example
If CAC is €6,000, a customer pays €1,000/month, and gross margin is 80%, payback = 6,000 ÷ (1,000 × 0.80) = 7.5 months. Under a year is generally healthy; much longer ties up cash and slows how fast you can reinvest in growth.
Frequently asked questions
What is CAC payback period?
The number of months it takes to recover the cost of acquiring a customer from the gross margin they generate.
What's a good CAC payback period?
For B2B SaaS, under roughly 12 months is generally considered healthy; best-in-class can be well under that.
How do you calculate CAC payback?
Divide CAC by the customer's monthly revenue multiplied by gross margin — the result is the months to break even on acquisition.
Related service: Track payback in HubSpot