Email & Retention
What is CAC payback period in ecommerce?
CAC payback period is the time it takes for the contribution generated by a new customer to recover the amount spent acquiring that customer.
Simple example
CAC = $60.
First order contributes $35 after variable costs.
Second order two months later contributes another $30.
The customer crosses $60 cumulative contribution after the second order. Payback is roughly two months.
Why it matters
LTV can make acquisition look profitable while hiding how much cash is tied up during growth. Payback shows how quickly the business can recycle acquisition investment.
Calculate contribution, not revenue
A $100 repeat order does not recover $100 CAC if $60 goes to product and fulfilment costs.
Track by cohort
Customers acquired from different channels, offers and first products can have different payback periods. A campaign with a higher CPA may still be better if it acquires customers who repeat much faster. Payback bridges advertising metrics with financial reality.
Growing revenue but constantly cash constrained?
If your store is growing revenue but constantly feels cash constrained, send us an inquiry. Acquisition payback may be part of the explanation.