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CAC Calculation Mistakes: The Timing Problem

CAC Calculation Mistakes: The Timing Problem. CAC calculation seems simple but timing errors are common. The wrong approach can make unprofitable ...

Published: October 6, 2025Updated: December 28, 2025By Rachel Morrison
Finance accounting calculator and metrics
RM

Rachel Morrison

SaaS Analytics Expert

Rachel specializes in SaaS metrics and analytics, helping subscription businesses understand their revenue data and make data-driven decisions.

CPA
SaaS Analytics
Revenue Operations
12+ years in SaaS

Based on our analysis of hundreds of SaaS companies, cAC calculation seems simple but timing errors are common. The wrong approach can make unprofitable channels look great.

The Timing Mismatch

Marketing spend today generates customers months later. Dividing this month spend by this month customers creates misleading CAC.

Proper Time Attribution

Match spend to the customers it generated. Use cohort-based attribution: January spend divided by customers who started evaluating in January.

What to Include in CAC

Include all customer acquisition costs: marketing, sales salaries, tools, agencies, events. Exclude customer success and support costs.

Blended vs Channel CAC

Track both overall blended CAC and channel-specific CAC. Blended shows efficiency trends; channel CAC guides budget allocation.

Frequently Asked Questions

How do I attribute spend to customers?

Use sales cycle length. If your cycle is 60 days, customers acquired in March came from January marketing spend.

Should I include salaries in CAC?

Yes, include sales and marketing salaries. Some companies also include a portion of executive time spent on sales/marketing.

Disclaimer

This content is for informational purposes only and does not constitute financial, accounting, or legal advice. Consult with qualified professionals before making business decisions. Metrics and benchmarks may vary by industry and company size.

Key Takeaways

Accurate CAC requires proper timing attribution. Without it, you cannot make good decisions about where to invest in growth.

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