Measure how quickly an investment recovers its initial cost. Compare ordinary and discounted payback and inspect every annual cash flow.
Formula
Each discounted cash flow isCFₜ / (1 + d)ᵗ. Payback occurs inside the first year whose cumulative balance crosses zero; the fractional year is the unrecovered balance divided by that year's cash flow.Examples
Growing annual cash flow
A $100,000 investment beginning at $30,000 per year, growing 5% for five years, pays back in 3.144 years. At a 10% discount rate its discounted payback is 3.943 years.