Payback Period vs. NPV: Why Faster Isn't Always Better
October 21, 2026
Payback period is the time it takes for cumulative cash flows to repay the initial investment. If you invest $1,000 and receive $400 a year, payback is 2.5 years. It is simple and intuitive, but it ignores what happens after payback and treats a dollar next year as equal to a dollar today. NPV fixes both problems.
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Consider two projects that each cost $1,000. Project A returns $500 in each of years 1 and 2, then nothing. Project B returns $400 a year for 5 years. Project A pays back in 2 years, Project B in 2.5 years. A payback rule picks A.
But A's total return is $1,000, a zero gain, while B returns $2,000 in total. At a 8% discount rate, A has an NPV of about −$108 and B has an NPV of about +$597, so B is clearly better.
| Project A | Project B | |
|---|---|---|
| Cash flows | $500 x 2 years | $400 x 5 years |
| Payback | 2.0 years | 2.5 years |
| NPV at 8% | −$108 | +$597 |
Discounted Payback
Discounted payback applies the discount rate to each cash flow before computing the payback time. For the $1,000 project returning $400 a year at 8%, cumulative discounted flows are 370, 713, and 1,031 by the end of year 3, so discounted payback is just under 3 years, longer than the simple 2.5 years.
It accounts for the time value of money but still ignores cash flows after the cutoff, so it can reject long-term projects that create substantial value.
When Payback Is Useful
Payback is a quick liquidity and risk measure. A short payback means your money is at risk for less time, which matters in fast-changing industries or when funds are tight. Many managers set a maximum payback as a first screen.
Use it as a supplement. For decisions that involve large amounts or long horizons, NPV and IRR give a more complete picture.
Frequently Asked Questions
How do you calculate the payback period?
Divide the initial investment by annual cash flow if flows are equal, or accumulate flows until they equal the investment.
What is the main weakness of payback period?
It ignores cash flows after payback and the time value of money.
What is discounted payback?
The time needed for the present value of cash flows to recover the investment.
Should I use payback or NPV?
Use NPV as the main decision tool, and payback as a secondary view of risk and liquidity.