Discount Rate

The discount rate is the annual rate used to convert a future cash flow into its value today. It expresses two facts at once: money available now can be invested, and money promised later carries risk.

Present Value = Future Cash Flow / (1 + r)^t

where r is the discount rate and t is the number of years until the cash arrives. The higher the rate or the longer the wait, the less a future dollar is worth today.

A business expects to receive $100,000 in three years.

• At a 10% discount rate: $100,000 / (1.10)^3 = $75,131 today
• At an 8% discount rate: $100,000 / (1.08)^3 = $79,383 today

Two percentage points changed the answer by $4,252 on a single cash flow. Across a ten-year valuation with dozens of cash flows, the discount rate choice often moves the result more than the forecast itself.

The rate should match the risk of the cash flows being discounted. Companies valuing themselves typically use their weighted average cost of capital (WACC), the blended cost of their debt and equity. A riskier project inside the same company deserves a higher rate than the company average. For a quick internal decision, many SMBs use their actual borrowing cost plus a margin for risk, which is cruder but honest about where the money would come from.

The discount rate converts future cash into today's value, making the timing of cash flows as important as their size. It is why collecting sooner is worth more than collecting the same amount later. That logic runs through everyday decisions too: an early-payment discount offered to a customer is a discount rate in disguise. Cash Flow Frog lets you test those timing trades in a forecast, comparing what earlier collection does to the projected balance against the margin given up. The valuation method built on this rate is covered under discounted cash flow.