The time required to recover the cost of acquiring a customer from the gross profit generated by that customer — a measure of how capital-efficient a growth business is.
Deeper Explanation
Payback period = CAC ÷ monthly gross profit per customer. A payback period of 18 months means the business recovers its customer acquisition investment within 18 months — after which every month of retention is pure incremental profit. Payback periods above 36 months require substantial capital to fund the gap between acquisition cost and revenue recovery, making the business vulnerable to funding constraints and competitive disruption. Best-in-class SaaS businesses achieve payback periods of 12 months or below. Payback period and LTV/CAC together paint the full picture of unit economics: payback period measures short-term capital efficiency; LTV/CAC measures long-term value creation.
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