What Is a DCF? Discounted Cash Flow Valuation Explained

A discounted cash flow (DCF) model values a company by estimating the cash it will generate in future years and converting those future dollars into what they’re worth today. The core logic is simple even when the spreadsheet gets complicated: a business is worth the cash it can hand its owners over its lifetime, and a dollar received five years from now is worth less than a dollar in hand today, so future cash has to be “discounted” back to a present value before it can be added up into a single price tag.

Why future cash is worth less today

Money available now can be invested to earn a return, so a dollar today is worth more than a dollar promised later — the gap grows the longer you have to wait and the higher the return you could otherwise earn elsewhere. A DCF formalizes this with a discount rate: divide a future cash flow by (1 + discount rate) raised to the power of how many years away it is, and you get its value in today’s dollars. Do this for every year of projected cash flow and sum the results, and you have the present value of the whole projected stream.

The discount rate itself usually reflects the weighted average cost of capital (WACC) — a blend of what it costs the company to raise money via debt and equity, weighted by how much of each it uses. A higher discount rate means future cash is worth proportionally less today, which is why riskier businesses — ones where those future cash flows are less certain — get valued with a higher discount rate and, all else equal, a lower resulting valuation.

The three ingredients

A DCF needs three things: a projection of free cash flow for some number of years out (five and ten years are common horizons), a discount rate to bring each year’s cash flow back to present value, and a terminal value representing everything beyond the explicit projection period, since few analysts try to forecast cash flows decades into the future year by year.

The terminal value typically dominates the total — often more than half of a DCF’s output — which is worth sitting with, because it usually rests on one of the model’s shakiest assumptions: a long-run growth rate applied forever, or a multiple applied to the final projected year’s cash flow. Small changes to that single assumption can move the entire valuation by a large percentage, which is the central reason DCF outputs are treated as a range and a way of thinking, not a precise number.

A simplified example

Suppose a company is projected to generate $100 million in free cash flow next year, growing 5% annually for five years, with a 9% discount rate and a terminal value calculated by applying a long-run 2% growth rate forever after that:

Year	Projected FCF	Discount factor (9%)	Present value
1	$100M	0.917	$91.7M
2	$105M	0.842	$88.4M
3	$110M	0.772	$85.0M
4	$116M	0.708	$82.1M
5	$122M	0.650	$79.3M
Terminal value	—	0.650	~$1,205M

Summing the present values of years one through five and the discounted terminal value gives the estimated enterprise value of the business. From there, subtracting net debt gets to equity value, which divided by shares outstanding gives an estimated per-share price — the same building blocks behind market cap versus enterprise value.

DCF vs comparable multiples

DCF is one of two dominant valuation approaches; the other is applying a multiple — like the P/E ratio or EV/EBITDA — observed for similar companies to the company being valued. They’re used together as often as they’re used alone, each checking the other.

	DCF	Comparable multiples
Basis	Company’s own projected cash flows	Market pricing of similar companies
Sensitivity	High — small assumption changes swing the output a lot	Lower, but inherits the market’s current mood
Data needed	Detailed multi-year projections	Recent financials of comparable companies
Best suited for	Businesses with predictable, model-able cash flows	Quick sanity checks, sectors with many public peers
Weakness	Garbage in, garbage out on assumptions	No comparable is ever truly identical

What a DCF is actually good for

A DCF is rarely treated as a single precise number in practice — professional analysts typically run it across a range of discount rates and growth assumptions to produce a range of plausible values, sometimes visualized as a sensitivity table. The value of the exercise is less about landing on one “correct” price and more about making the assumptions driving a valuation explicit and inspectable: how fast does revenue really need to grow to justify the current price, and how much of that valuation is riding on the terminal value assumption alone?

That transparency is also its biggest limitation. A DCF can produce a confident-looking number from assumptions that are, underneath, mostly guesses about a business a decade out — which is a reasonable exercise for a mature, cash-generative company and considerably shakier for a fast-growing one where near-term cash flow is small or negative. It’s one input into an investment decision, not a verdict, and it works best alongside other checks like a company’s PEG ratio or a look at its balance sheet.

The takeaway

A DCF estimates what a company is worth today by projecting its future free cash flows and discounting each year back to present value using a rate that reflects the business’s cost of capital and risk. The math is mechanical, but the output is only as good as the growth, margin, and discount-rate assumptions feeding it — and the terminal value assumption alone often swings the answer more than everything else in the model combined. Treat a DCF as a way to make assumptions explicit and testable, not as a precise price target.