What Is the Payback Period?
The payback period is the time it takes for a project's cash inflows to recover its initial investment. Simple but limited, it's an early screen in investment appraisal. Here's how it works.
The payback period is the length of time it takes for a project's cash inflows to recover its initial investment. If a project costs 100,000 and generates 25,000 a year, the payback period is four years. It's one of the simplest investment-appraisal methods and is often used as an early screen before more sophisticated analysis.
How is it calculated?
- For even cash flows: initial investment ÷ annual cash inflow.
- For uneven cash flows: accumulate the inflows year by year until the initial investment is recovered, interpolating within the final year.
Discounted payback
A refinement, discounted payback, first discounts the cash flows to present value and then measures how long they take to recover the investment. This addresses one of payback's main flaws — that it ignores the time value of money — but it still has limitations.
Strengths and weaknesses
Payback is simple, easy to understand and focuses on liquidity and early cash recovery. But it ignores cash flows after the payback point, ignores the overall profitability of the project, and (in its basic form) ignores the time value of money. That's why it's used alongside NPV rather than instead of it.
Payback appears in ACCA FM alongside NPV and IRR, and questions often ask you to calculate it and discuss its limitations. Practising these questions and marking them against the official ACCA scheme with The 50% Club shows you exactly where your calculation or evaluation loses marks.