What is CAC Payback Period?
Also known as: CAC Payback
How many months it takes for the cumulative gross profit from a customer to recover their acquisition cost. The cash-flow companion to LTV:CAC.
CAC Payback Period (months) = CAC ÷ Monthly Gross Profit per CustomerThe detailed definition
LTV:CAC tells you if your business is sustainable; CAC Payback Period tells you when cash arrives. A 5:1 LTV:CAC business with 36-month payback is structurally healthy but cash-hungry — every customer is a 3-year IOU. A 3:1 business with 9-month payback throws off cash faster and supports more aggressive growth. Healthy B2B SaaS targets 6–18 month payback; consumer subscription often 3–6 months; ecommerce subscription 1–3 months. For pure-purchase ecommerce, the equivalent is 'months to repeat-purchase profitability' — when does cumulative gross profit from a customer cohort exceed their CAC.
Related terms
Frequently asked about CAC Payback Period
›What's a good CAC payback period?
Depends on business model. B2B SaaS: 6–18 months for healthy enterprise, 3–12 for SMB. Consumer subscription: 3–6 months. Ecommerce: 1–3 months for sustainable models. Longer payback isn't necessarily bad — venture-backed growth often tolerates 24+ month payback when LTV:CAC is strong.
›How does CAC payback relate to cash flow?
Directly. CAC payback period determines how long your acquisition spending sits as a 'loan' before revenue catches up. Companies with long payback periods are inherently cash-hungry and need either profitability elsewhere or external funding to scale acquisition. Short payback periods enable self-funded growth.
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