CAC payback is one type of payback period. Payback period works for any investment. CAC payback is specifically about recovering the cost of acquiring a customer.
Last updated: 2026-04-01
The time required to recover an initial investment from the cash flows it generates. Used for any capital decision: a feature build, a marketing campaign, a piece of equipment. Answer is in months or years.
Best for capital-allocation decisions. When you're comparing two investments, payback period tells you which one returns money faster.
A specific kind of payback that measures how many months it takes to recover the cost of acquiring a single customer, computed from gross profit per customer per month. The SaaS targets on this page come from Bessemer's 2021 guidance; they are operating guidelines by segment.
Best for SaaS unit economics. Estimates how quickly customer gross profit recovers acquisition cost.
Simple payback = Initial investment / Constant net cash inflow per periodUse net cash inflows after ongoing costs. If they vary, add them over time until they cover the initial investment.
CAC payback = CAC / (ARPA x Gross margin %)ARPA is monthly revenue per account. Enter gross margin as a decimal, such as 0.8 for 80%. The simple estimate assumes stable monthly gross profit.
| Criteria | Payback Period | CAC Payback |
|---|---|---|
| Scope | Any investment | Customer acquisition only |
| Denominator | Net cash inflow after ongoing costs | ARPA x Gross margin |
| Output unit | Months or years | Months |
| Best for | Capital allocation, feature ROI | SaaS acquisition efficiency |
| Time value of money | Ignored. Use NPV if needed | Ignored in the simple calculation |
| Healthy benchmark | Domain-specific | Bessemer 2021 targets: <12 SMB, <18 mid-market, <24 enterprise |
| Benchmark interpretation | N/A | Segment-specific guidance, not a universal target |
| Pairs with | NPV, IRR for full capital decisions | LTV:CAC, churn rate |
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Use your own inputs to explore the calculations and compare results.
CAC payback is a specific payback measure for customer acquisition. General cash payback measures when net cash inflows recover an investment. The common SaaS CAC formula uses monthly gross profit per customer.
Bessemer's 2021 guidance targets under 12 months for SMB SaaS, 18 for mid-market, and 24 for enterprise. These are operating guidelines by segment, not current market medians. Compare payback with retention, cash available, and lifetime gross profit.
The common formula divides CAC by monthly revenue per customer multiplied by gross margin. That accounts for the cost of serving the customer. It does not show when the whole business becomes profitable.
LTV:CAC compares lifetime gross profit with acquisition cost. Payback measures recovery time. At the same 3:1 ratio, a 9-month payback returns acquisition spending sooner than a 24-month payback, with other assumptions unchanged.
Yes. Estimate the extra cash inflows or cash savings attributable to the feature, subtract ongoing costs, and compare the cumulative amount with build cost. Revenue lift alone is not net cash flow. Document the assumptions and revisit them after launch.