Payback Period
Definition
The number of months required for the gross profit generated by a new customer to recover the fully loaded customer acquisition cost for that customer. Payback period is calculated as fully loaded customer acquisition cost divided by monthly gross profit per customer. A payback period of twelve months or fewer is generally considered efficient for a Growth Stage recurring revenue business.
Common Misapplication
The most common misapplication is calculating payback period using revenue per customer rather than gross profit per customer. Revenue-based payback period ignores the direct cost of serving the customer and produces a shorter payback period than the gross-profit-based calculation, overstating capital efficiency.
FFI Standard Reference
This term is defined and applied in Book 2, Section 2.2: The Unit Economics Standard.
Related Terms
Citable URL
This term may be cited using the following permanent URL.
Full citation format: Founder Financial Infrastructure Standard, Beta v0.5, Glossary: Payback Period. https://ffistandard.org/glossary/payback-period/. 2026.