Frequently asked questions
What is a good payback period?
It depends on the industry and investment type. Equipment purchases typically aim for 3–5 years. Real estate might accept 8–12 years. Startups and high-risk investments should pay back within 2–3 years to justify the risk. Compare against your minimum acceptable payback threshold for the category.
What is the difference between simple and discounted payback?
Simple payback divides the investment by annual cash flow, ignoring the time value of money. Discounted payback accounts for the fact that future cash flows are worth less than today's money (discounted at your cost of capital). Discounted payback is always longer and gives a more realistic assessment.
Why doesn't payback period consider profits after breakeven?
That's the main limitation. Two investments with the same payback might have vastly different total returns. One might generate cash for 20 more years, the other stops. Payback period measures risk (time to recover capital), not overall profitability. Use it alongside NPV or IRR for a complete picture.
Should I use annual or monthly cash flow?
Use monthly if your cash flows are genuinely monthly (rental income, subscription revenue). The calculator converts to annual for the payback calculation. The result is the same either way as long as the annual total is correct. Monthly entry is more intuitive for recurring income.
What discount rate should I use?
Use your cost of capital, which is the return you could earn elsewhere at similar risk. For a business, this might be 8–12%. For personal investments, use your opportunity cost (what your money could earn in the stock market, typically 7–10%). A higher discount rate makes the payback period longer.
What if cash flows are uneven?
This calculator assumes uniform annual cash flows. For irregular cash flows, use the IRR calculator in custom mode to analyze the investment, or manually track cumulative cash flow until it exceeds the initial investment.