What a B2B SaaS customer costs and how many months until payback
The cost of acquiring a SaaS customer is judged by payback period, CAC divided by monthly gross profit per customer (the monthly subscription adjusted by gross margin). A healthy B2B SaaS recovers its acquisition cost in under 12 months and runs an LTV:CAC ratio of at least 3:1. Below those thresholds, every new customer consumes more than it brings, and growth burns your cash.