What Is Customer Acquisition Cost (CAC)? A Guide for Business Buyers

What it costs, on average, to land one new customer — factoring in sales, marketing, and related operating costs.

Why it matters: For a buyer evaluating a Main Street business, CAC is a quiet signal of how dependent the business is on the current owner's relationships versus a repeatable, transferable system. A business with a low, well-documented CAC and a clear marketing channel (a website generating consistent leads, a referral program that runs itself) is more valuable to a new owner than one where "acquisition" really just means the seller's decades of personal relationships and word-of-mouth — because the latter doesn't necessarily transfer at closing. CAC only tells half the story on its own, though: it needs to be weighed against downstream value — repeat business, referrals, churn, and customer lifetime value — to know whether a given customer or channel is actually profitable once acquired.

Example: A home services business spends $15,000/year on local ads and gets 100 new customers from it — a $150 CAC. If the average customer generates $2,000 in lifetime revenue, that's a strong return; if most customers are one-and-done at $180 average ticket, the math barely breaks even.

CAC can also be measured and compared across sales/marketing channels within a company, or benchmarked against similar businesses in the same industry to gauge marketing efficiency.

Related terms: Return on Investment (ROI), Owner's Salary, Cash Flow