How payback period is calculated
Simple payback = initial investment ÷ annual net cash flow. For discounted payback, discount each year’s cash flow and accumulate it until the initial outlay is recovered, interpolating within the final year.
Worked example
An initial $50,000 outlay followed by $10,000 annual net cash inflows has a five-year simple payback. At a 0% discount rate, discounted payback is also five years.