Definition
CAC payback period is the number of months of gross profit needed to recover customer acquisition cost.
Why it matters
It links pricing, margin, and sales efficiency, helping you decide how much to invest in growth.
Pricing implications
Higher margins and higher ARPA shorten payback and allow more aggressive acquisition spending.
Measurement tips
Use gross profit, not revenue, and exclude one-time fees unless they are recurring and predictable.
Checklist
- Use fully loaded CAC (sales + marketing).
- Use gross profit, not top-line revenue.
- Separate payback by segment and channel.
- Account for ramp time to full usage.
- Monitor payback after pricing changes.
- Set target payback ranges by market.
- Validate against cohort retention.
- Document all assumptions.
Examples
- ,800 CAC / monthly gross profit = 12 months payback.