What is the best way to calculate CAC when marketing and sales teams share the same budget center?
Quick Answer: The best way to calculate CAC when marketing and sales share a single budget center is to use a fully loaded, channel-attributed CAC model that allocates the shared spend to newly acquired customers based on a defensible driver such as lead stage progression, revenue contribution, or capacity usage. In practice, the cleanest enterprise method is to separate direct acquisition costs from shared overhead, then assign the shared budget across acquisition outcomes using a consistent allocation rule so CAC remains comparable over time and across channels.
Detailed Explanation
When marketing and sales are funded from the same budget center, CAC should not be treated as a simple division of total spend by new customers because that collapses two different cost types: direct variable acquisition costs and shared operating costs. A robust calculation starts by isolating all costs tied to acquisition, then classifying them as either directly attributable to a channel or shared across the funnel. Shared spend should be allocated using a measurable driver such as sourced pipeline, influenced pipeline, booked meetings, closed-won revenue, or sales capacity consumed, depending on where the joint budget actually creates value. The goal is not accounting convenience; it is decision-grade CAC that can be benchmarked consistently, supports budget allocation, and avoids understating true customer acquisition economics.
Key Technical Drivers
- Separate spend into direct acquisition costs and shared overhead, then define a single allocation rule for the shared budget center.
- Use a driver aligned to the operating model: sourced pipeline for demand-gen-led motion, closed-won revenue for revenue-based attribution, or capacity hours for sales-intensive motions.
- Track fully loaded CAC as: (direct marketing + direct sales + allocated shared spend) / new customers acquired, and keep the allocation methodology fixed across reporting periods.