Discounted Cash Flow (DCF) Valuation: The Basics

Estimate what a company is really worth by projecting the cash it will generate in the future.

What Is Discounted Cash Flow (DCF)

DCF is an absolute valuation method: it projects a company's future cash flows and converts them into today's dollars to arrive at an estimate of intrinsic value. Unlike relative valuation methods such as P/E or P/B, which compare a company to peers or market averages, DCF relies only on that company's own projected ability to generate cash -- it applies the time value of money (a dollar today is worth more than a dollar in ten years) to a company's entire future cash stream.

Estimating Free Cash Flow (FCF)

The starting point of a DCF is projecting free cash flow -- the cash generated by operations minus capital spending -- for several years into the future. Analysts typically build assumptions about revenue growth, operating margins, and capital expenditures to forecast free cash flow 5 to 10 years out, based on historical performance and industry outlook, though these projections are still forecasts and small changes in assumptions can swing the result significantly.

The Discount Rate (WACC)

The discount rate converts future cash into today's value, and companies typically use their weighted average cost of capital (WACC), which blends the cost of equity and the cost of debt. A higher discount rate produces a lower present value and vice versa -- since WACC reflects a company's debt level, business risk, and prevailing interest rates, the same projected cash flows can produce very different valuations depending on the rate applied.

The Forecast Period and Terminal Value

Analysts usually project cash flows individually for 5 to 10 years, then estimate a single lump-sum "terminal value" assuming the company grows at a steady rate forever after that. Terminal value is calculated from the final projected year's cash flow using a perpetual growth rate and the discount rate, and it often makes up a large share of the total valuation -- meaning even a small change in the assumed growth rate can meaningfully shift the final result.

Summing Present Values to Reach Enterprise Value

Discounting each projected year's free cash flow and the terminal value back to today's dollars and adding them together gives you the company's total enterprise value. Subtracting net debt (debt minus cash) from that gives equity value, and dividing by shares outstanding produces an estimated intrinsic value per share, which can then be compared to the current stock price to judge whether it looks under- or overvalued.

Limitations of DCF

Because the result is extremely sensitive to assumptions about growth rate, discount rate, and forecast period, two analysts modeling the same company can arrive at very different valuations. DCF is especially unreliable for early-stage or unprofitable companies where future cash flow is hard to predict, or for industries facing rapid disruption -- it can look precise while actually being a bundle of assumptions, so results should always be interpreted with that caveat.

Using DCF Alongside Relative Valuation

Rather than relying on DCF alone, cross-checking it against relative valuation metrics like P/E or P/B can help catch distortions from an overly optimistic or pessimistic assumption. If the DCF value and a peer-average P/E-implied value diverge sharply, it's worth revisiting which set of assumptions is out of line -- combining methods generally gives a more balanced view than depending on a single model.

Using DCF Alongside Other Valuation Tools

To sanity-check a DCF result, comparing it against the P/E and P/B ratios of similar companies is a common next step, and factoring in growth with a metric like the PEG ratio can add another layer of context. Building financial-statement literacy first makes each of these tools more meaningful, since valuation methods are only as good as the inputs behind them.

Why DCF Results Vary So Widely

This page is general financial education about the basics of discounted cash flow valuation, not investment advice. Because DCF is built on assumptions, its output is never an absolute right answer -- before making any real investment decision, it's worth checking additional data points and metrics, or consulting a qualified financial professional.

Frequently Asked Questions

Can individual investors build their own DCF model?

Once you understand the basic mechanics, you can build a simple DCF model in a spreadsheet. Because results are so sensitive to growth and discount rate assumptions, it's worth running the model under a few scenarios -- conservative, neutral, and optimistic -- rather than relying on a single set of inputs.

Does DCF work for every company?

It tends to work reasonably well for mature companies with steady, predictable cash flow, but it becomes far less reliable for unprofitable or early-stage companies whose business models change frequently, since forecasting their future cash flow is inherently difficult.