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Payback period answers the cash-flow question that LTV:CAC ignores: how long until we recover what we spent acquiring this customer? A company with a 3:1 LTV:CAC ratio but a 36-month payback period needs three years of uninterrupted revenue per customer just to break even on acquisition — a serious cash constraint. Founders and operators who understand payback period can make smarter decisions about how aggressively to scale without burning cash.
Payback Period (months) = CAC ÷ (Monthly Revenue per Customer × Gross Margin %). This is the number of months until the gross profit from a customer equals what was spent acquiring them.
cac to 400 and observe how payback crosses 11 months — identify the point at which payback exceeds a typical annual contract length.expansion_mrr variable (revenue from upsells/cross-sells in months 3–6) and recalculate payback using cumulative gross profit — compare it to the simple formula.Use these three in order. Each builds on the one before.
In one paragraph, explain what payback period is in paid acquisition and why it is a different (and complementary) metric to LTV:CAC.
Walk me through exactly how payback period is calculated — numerator, denominator, and the gross margin adjustment — and explain what happens to payback when gross margin drops from 80% to 50%.
We are debating whether to scale from $50k/month in paid spend to $200k/month. Walk me through how payback period should factor into that decision alongside LTV:CAC and available working capital.