DCF Valuation Explained: From Cash Flows to Equity Value

Discounted cash flow valuation rests on one idea: a business is worth the cash it will generate, adjusted for the time and risk involved in generating it. Everything else — the projections, the discount rate, the terminal value — is the machinery that makes that idea operational.

Step 1: Project free cash flow

Start with unlevered free cash flow — the cash the business generates before financing decisions: operating profit after tax, plus depreciation, minus capital expenditure, minus the increase in working capital. Project it for an explicit forecast period, typically five to ten years, driven by defensible assumptions about growth, margins and reinvestment.

Step 2: Choose the discount rate

The discount rate reflects the risk of those cash flows. For unlevered cash flows, the standard choice is the weighted average cost of capital — the blended return demanded by equity holders and lenders. Small changes matter enormously: a one-percentage-point change in WACC routinely moves the valuation by 15–25%.

Step 3: Estimate terminal value — carefully

Businesses do not stop at year five, so a terminal value captures everything beyond the forecast. The Gordon growth approach grows the final cash flow at a modest perpetual rate — bounded by long-run economic growth — and capitalises it. Here is the uncomfortable truth: terminal value is often 60–80% of the total answer. It deserves more scrutiny than any forecast-year assumption, and a growth rate above long-run GDP growth is a red flag, not an assumption.

Step 4: Bridge to equity value

Sum the present values of the forecast cash flows and the terminal value and you have enterprise value — the value of the whole business. To reach what belongs to shareholders, subtract net debt and adjust for other claims: minority interests, preferred capital, pension deficits. The bridge between enterprise value and equity value is where many valuations quietly go wrong.

Step 5: Show the sensitivity, not just the answer

A DCF presented as a single number is false precision. The honest output is a grid: equity value across a range of discount rates and terminal growth rates. That grid tells the decision-maker which assumptions the conclusion is hostage to — usually the same two.

Where DCF breaks

DCF struggles with early-stage companies (cash flows too speculative), financial institutions (capital is raw material, not just funding), and cyclical businesses valued at the wrong point of the cycle. In those cases, triangulate with multiples and precedents. Try the mechanics yourself in the Finance Lab DCF calculator — the sensitivity grid makes the fragility visible in seconds.