What Is Customer Acquisition Cost (CAC)? | BounceZero
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What Is Customer Acquisition Cost (CAC)?

Customer acquisition cost is the total sales and marketing spend in a period divided by the number of new customers won in it. It is tracked blended and per channel, and compared with lifetime value; a LTV to CAC ratio of three or more is the usual target, with payback inside 12 months for SaaS. Data quality sits inside CAC as a hidden line: spend on finder credits, sequences and rep time that goes to addresses which bounce is acquisition cost with no customer attached.

By Ayoub Lebda, founder of BounceZero, a UK-registered email verification service|10 October 2026

How it is measured and used

CAC is computed from the finance ledger, not the CRM, so that tool costs, salaries and agency fees are included. Per-channel CAC needs attribution, which is imperfect; blended CAC is the number investors read.

The data discount is easy to size. If 14.5% of an outbound list is invalid and the list cost, the sequencing seats and a share of rep time were spent on all of it, that share of outbound spend produced nothing. Verification at a fraction of a cent per address is the cheapest CAC reduction available to an outbound team.

Example with numbers

An outbound programme spends $18,000 a quarter and wins 30 customers: CAC $600. 15% of its list was invalid, so about $2,700 was spent reaching nobody. Verifying the 40,000 addresses it works per quarter costs $140 on a Business pack; the same 30 customers at $15,440 of effective spend is a CAC of $515.

Related terms

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Written by

Ayoub Lebda

Founder, BounceZero - Email-infrastructure engineer

Ayoub built BounceZero's 5-stage validation pipeline, its dedicated BGP-announced IP infrastructure, and the Patroni HA PostgreSQL cluster behind every verification. Previously built high-volume email delivery infrastructure. Trained at 1337 Benguerir (École 42 network, 2019). Open-source: bgp_analyzer.