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Glossary
Customer acquisition cost
Customer acquisition cost (CAC) is the fully loaded cost of acquiring a new customer (or other defined acquiring unit) — typically sales and marketing spend attributable to acquisition, divided by customers acquired under a matched attribution policy. Expense timing and conversion timing often differ; same-period division is only correct when the organization deliberately uses that simplification.
Why it matters
Growth plans fail when CAC is undercounted or mistimed. “Blended CAC” that ignores sales salaries, tools, agencies, or onboarding incentives looks cheaper than true fully loaded CAC. In long B2B cycles, spend in one quarter may produce closed-won logos in later quarters — so operators should prefer lag-adjusted or cohort-aligned attribution that matches acquisition investment to the customers it produced.
CAC only becomes meaningful next to contribution margin, retention, and lifetime value. A rising CAC can be rational in a high-CLV segment; a low CAC can still destroy value if contribution is thin or churn is high.
Example (enterprise): A B2B vendor capitalizes the idea of cohort CAC: media and sales cost for opportunities opened in Q1 is attributed to logos closed from that cohort over the following two quarters, including SDR/AE/SE load — then payback is measured against contribution margin per account.
Mechanisms
- Cost aggregation — include the acquisition costs treated as load-bearing for the motion (media, sales comp, tools, partner fees as applicable).
- Matched attribution — align spend with the customers it produced via cohort windows or lag adjustment; do not assume same-period division is always valid.
- Segmentation — report CAC by channel, segment, and geo when blends hide poor economics.
Boundaries
- CAC ≠ total marketing budget if large portions are brand or existing-customer spend — attribution policy must be explicit.
- CAC ≠ a quality score for growth by itself; pair with CLV, payback, and contribution margin.
- Same-period CAC formulas can mislead when sales cycles span reporting periods.
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