What is CAC payback, and how is it calculated?

What goes into CAC

Everything spent to win new customers in a period: sales and marketing salaries, commissions, tools, advertising and agency fees, divided by the number of new customers won in that period. The common error is leaving out salaries or counting only ad spend, which makes acquisition look far cheaper than it is.

Why gross margin belongs in the formula

Revenue does not repay acquisition cost. Profit does. A customer paying a given amount each month at a high margin repays faster than the same revenue at a low one. Leaving margin out flatters the number, and boards and investors will put it back in.

What moves it

Three things. Spending less to win each customer, which usually means less wasted effort on accounts that were never going to buy. Winning larger or better-priced deals. And closing faster, since a long sales cycle means paying for a seller's time for longer before any revenue arrives.

How to read it

Compare it by segment and by channel, not as one company-wide figure. A blended number hides a channel that pays back quickly and another that never does. And check it against retention: a fast payback on customers who leave early is not a good result. Recalculate it each quarter on the same definitions, because the trend says more than any single reading, and a payback that lengthens while revenue grows is an early warning.

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