Payback Period Calculator

Understanding Payback Period vs. Discounted Payback Period

When analyzing new business ventures, machinery purchases, or other capital projects, managers want to know: How long will it take to get our initial investment back? This duration is known as the Payback Period.

Standard vs. Discounted Payback

There are two primary methods to compute payback periods:

• Standard Payback Period: This is the simple method. It sums future raw cash inflows year-by-year until they cover the initial outlay. It is easy to calculate but has one major flaw: it ignores the time value of money (the concept that a dollar today is worth more than a dollar tomorrow).
• Discounted Payback Period: This is the advanced, risk-adjusted method. It discounts future cash inflows using your company's cost of capital (or discount rate) before summing them. This reflects the opportunity cost of having your capital locked up. As a result, the discounted payback period is always longer than the standard payback, and in some cases, a project may never pay back on a discounted basis.

Pros and Cons of the Payback Method

The payback method is a fantastic tool for evaluating liquidity and risk. Projects with shorter payback periods reduce the time your capital is exposed to market uncertainty.

However, the payback method has a massive limitation: it completely ignores any cash flows that occur after the break-even point is reached. A project that pays back in 2 years but dies in Year 3 is selected over a project that pays back in 4 years but generates massive cash inflows for another 15 years. For this reason, payback should always be evaluated alongside NPV and IRR.