Quick Answer: Improve lead source accuracy by making first-touch and last-touch attribution mandatory at capture, standardizing every channel into a controlled source taxonomy, and syncing that data into a single CRM field model with automation and validation. When marketing, sales, and finance all report from the same source definitions and deduped contact/account records, CAC becomes auditable instead of opinion-based.
Trustworthy CAC reporting starts with data governance, not dashboards. The revenue team needs one source-of-truth architecture that captures lead origin at the moment of entry, normalizes it through a strict taxonomy, and preserves both original and updated attribution fields as the lead moves through the funnel. That means enforcing UTM and referrer capture, mapping every inbound path to approved source categories, deduplicating contacts and accounts, and preventing manual overrides from destroying historical attribution. Once the CRM, analytics layer, and finance reporting all reference the same governed fields, lead source accuracy becomes consistent enough to support spend allocation, pipeline efficiency analysis, and CAC decisions that the entire organization can trust.