Payback Period

Payback period measures how long it takes for a customer's gross profit contribution to equal the cost of acquiring them. The formula is: CAC divided by (monthly ARPU times gross margin). A shorter payback period means the company recovers its acquisition investment faster and can reinvest sooner.

Payback period is a more practical metric than LTV:CAC for day-to-day decision-making because it is easier to calculate accurately (it does not require estimating customer lifetime, which is uncertain for young companies) and it has immediate cash flow implications. A 6-month payback means the company recoups acquisition costs within the same fiscal year, while an 18-month payback ties up capital for much longer.

Benchmarks vary by segment: SMB SaaS companies should aim for 6-12 month payback, mid-market for 12-18 months, and enterprise for 18-24 months. Longer payback periods require more capital to fund growth because the company must finance customer acquisition costs for a longer period before those customers become profitable. This is why companies with short payback periods can grow faster on less capital.