CAC Payback Period
The number of months it takes for a new customer to generate enough gross profit to recover the cost of acquiring them — a measure of capital efficiency in growth.
What it shows
Payback period shows how long the business is capital-negative on each new customer. Short payback (under 12 months) enables aggressive reinvestment in growth. Long payback (over 24 months) creates cash pressure and is a key fundraising efficiency concern.
Formula
CAC Payback Period = CAC ÷ (MRR × Gross Margin %). Result in months. Example: $12,000 CAC on a $500 MRR customer at 80% gross margin = 30-month payback.
Tracked in these industries
SaaS B2B
Subscription-based software sold to businesses. Long sales cycles, multi-stakeholder procurement, and recurring revenue tracked through ARR, NRR, and churn.
SaaS B2C
Subscription software sold directly to individuals. Self-serve, high volume, short cycles — revenue operations focused on activation, retention, and reducing involuntary churn.
FinTech
Revenue from interchange fees, lending spreads, AUM, or SaaS licensing. Compliance-aware pipelines and complex fee structure reporting.