What is Discounted Cash Flow (DCF)?
Discounted cash flow (DCF) sounds like jargon, but the idea behind it is simple: a dollar in the future is worth less than a dollar today. Once you get that, DCF is just a way to turn that idea into a number.
Why is future money worth less?
Two big reasons. First, you could invest today’s dollar and earn a return. If you can earn 5% a year, $1 today is worth more than $1 in a year, because that $1 today could become $1.05 in a year. So $1 in a year is worth less to you than $1 right now. Second, the future is uncertain. You might not get that future dollar (the company might go under, the project might fail). So we “discount” future cash — we shrink it when we think about it in today’s terms.
What is “discounting”?
Discounting is the math of turning future cash into today’s value. If I say a company will give you $100 in one year, and you want to think in “today’s” terms, you ask: how much would I need to invest today at some rate of return to get $100 in one year? If that rate is 10%, you’d need about $90.91 today. So we say the “present value” of $100 in one year is about $90.91. We’ve discounted it. Do that for every year of expected cash flow, add them up, and you get a total value in today’s dollars. That’s the core of DCF.
How do people use DCF for investing?
In theory, a business is worth the total of all the cash it will ever give to its owners, but in today’s terms. So you estimate how much cash the company will generate each year (or each period), discount each of those amounts back to today, and add them up. The result is an “intrinsic value” or what you think the business is worth based on those cash flows. If the current stock price is below that number, maybe it’s cheap; if it’s above, maybe it’s expensive. Of course, you never know the future cash flows for sure — you’re making assumptions. So DCF isn’t a crystal ball; it’s a structured way to turn your assumptions into a value.
A tiny example
Imagine a simple project: it will pay you $110 in one year and then nothing. You decide that 10% is the right rate to discount by (your “required return”). The present value of that $110 is $110 ÷ 1.10 ≈ $100. So in today’s terms, that future $110 is worth $100. If someone offered to sell you that project for $95, you might say it’s a good deal; if they asked $105, you might pass. DCF for a company is the same idea, with many years of cash flows and a discount rate that reflects risk and what else you could earn elsewhere.
Why it matters
DCF forces you to think about cash and time. A company can look profitable on paper but burn cash; DCF focuses on when actual cash comes in and goes out. And it makes the “time value of money” explicit: not all dollars are equal. A dollar in ten years is worth a lot less than a dollar today once you discount it. So when you hear someone say they “did a DCF,” they’re saying they estimated future cash flows and turned them into one number — today’s value — to compare with the price they’re paying. It’s a tool, not the truth, but it’s one of the most logical ways to think about what a business is worth.