DCF Valuation: A Practical Guide

Discounted cash flow (DCF) valuation estimates the value of a business as the present value of the cash flows it is expected to generate. It is one of the most widely used approaches to business valuation, and also one of the easiest to build in a way that looks precise while being highly sensitive to a few underlying assumptions.

Forecasting free cash flow

The forecast typically starts with unlevered free cash flow — cash flow available to all providers of capital, before financing effects. This is built from an operating forecast (often the same operating logic as a 3-statement model): EBIT, less taxes on EBIT, plus depreciation and amortization, less capital expenditure, less the change in working capital.

The forecast period should be long enough for the business to reach a stable, sustainable growth pattern — commonly five to ten years, depending on the industry and how far out performance can realistically be projected.

Choosing a discount rate

Unlevered free cash flows are discounted at the weighted average cost of capital (WACC), which blends the cost of equity (often estimated using the Capital Asset Pricing Model) and the after-tax cost of debt, weighted by target capital structure. Small changes in WACC produce large changes in value — this is worth stating explicitly in any valuation output, not left implicit.

Terminal value: the part that usually dominates

In most DCF models, terminal value — the value of cash flows beyond the explicit forecast period — accounts for the majority of total value. This makes it the single most important assumption to get right, and the easiest one to get quietly wrong.

• Gordon growth method: terminal value based on a perpetual growth rate applied to the final year's cash flow — the growth rate should not exceed a long-run rate the economy or industry can plausibly sustain.
• Exit multiple method: terminal value based on applying a market-derived multiple (e.g. EV/EBITDA) to the final forecast year — useful as a cross-check against the growth method.

Good practice is to calculate terminal value both ways and reconcile the implicit growth rate or implicit exit multiple each method produces, rather than relying on a single method without a sanity check.

From enterprise value to equity value

A DCF produces enterprise value. Getting to equity value requires subtracting net debt and any other claims senior to equity (minority interests, preferred capital) and adding back non-operating assets. This step is easy to overlook, but it's the number that ultimately matters to a shareholder or investor.

Cross-checking the output

A DCF result is most credible when triangulated against market-based approaches — comparable company multiples and, where relevant, precedent transactions. Large, unexplained gaps between methods are usually a sign that an assumption (growth, margin trajectory, discount rate) needs to be revisited, not that one method is simply 'right.'