Payback period
Principles of Finance glossary · Capital Budgeting
Definition
The time required for a project's cumulative undiscounted cash flows to equal the initial investment. Ignores the time value of money and all cash flows beyond the payback date; used in practice only as a coarse liquidity-of-capital proxy, not as a primary investment criterion.
Payback period in plain English
The payback period simply asks: how long until a project earns back the cash you first put in? You add up the incoming cash year by year until the running total equals your upfront investment. It's popular because it's easy and hints at how fast you get your money back, but it's a crude tool — it ignores that a dollar later is worth less than a dollar today, and it completely disregards any profit that arrives AFTER you break even. It's like judging a food truck only by how many months until it repays its startup cost, while ignoring the years of profit that follow and the fact that far-off cash is worth less now.
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