Why fully-loaded CAC exists
Paid CAC is useful for channel optimization, but it can understate what growth really costs. Fully-loaded CAC exists for planning: it adds the people, tools, and other acquisition costs required to win customers so you can judge whether growth still works after the full go-to-market bill is counted.
Formula
Fully-loaded CAC = total acquisition costs / new paying customers acquired (same period).
What to include (typical)
- Paid media spend and variable acquisition costs (agency, creative if variable).
- Allocated sales & marketing salaries and commissions (if treated as acquisition cost).
- Allocated tools and software needed for acquisition (CRM, email, enrichment).
- Other acquisition costs you consistently treat as acquisition (events, list rentals).
What to exclude (typical)
- COGS and support costs (these affect gross margin and payback, not CAC).
- R&D and general overhead unless you explicitly allocate them (avoid mixing definitions).
Common mistakes
- Using leads/trials as customers (denominator mismatch).
- Mixing time windows (monthly costs with quarterly customers).
- Changing what costs are included month-to-month (definition drift).
How to use it with payback
- Use payback months (CAC / gross profit/month) to compare channels fairly.
- A low paid CAC can still be bad if fully-loaded CAC is high and payback is long.
- Segment by channel and plan; blended CAC can hide weak cohorts.