Valuation: DCF and the Cost of Capital

A business is worth the present value of the cash it will generate. A discounted cash flow (DCF) projects free cash flow and discounts it by the weighted average cost of capital (WACC).

Terminal value often makes up most of a DCF's result — small changes in the perpetual growth rate or WACC swing value dramatically.

Triangulate: compare DCF with trading comparables and precedent transactions. Disagreement among methods is information.

Value is created only when return on invested capital (ROIC) exceeds WACC. Growth below that spread destroys value.

Return on invested capital (ROIC) is after-tax operating profit divided by the capital invested in operations. The weighted average cost of capital (WACC) is the required return of debt and equity investors, weighted by their shares of financing, with debt cost adjusted for applicable tax benefits. Growth creates value when the ROIC on additional investment exceeds WACC; revenue growth or an operating margin above 20% alone does not establish value creation.

Unlevered free cash flow is operating cash flow after taxes and reinvestment but before debt financing payments; it belongs to both debt and equity investors and is discounted at WACC, their weighted required return. Equity free cash flow, also called levered free cash flow, is cash available to shareholders after debt payments and net borrowing; it is discounted at the cost of equity, shareholders’ required return. The cost of debt is lenders’ required return, not the appropriate discount rate for either enterprise or equity free cash flow.

For a mature, stable utility valued using nominal cash flows, a perpetual growth rate aligned with projected long-term nominal GDP growth—2.5% in this example—is the most defensible baseline, provided reinvestment and the discount rate support it. Gross domestic product (GDP) measures an economy’s output; nominal growth includes inflation. A five-year revenue compound annual growth rate (CAGR), the constant annual rate connecting starting and ending revenue, is not a perpetual forecast. Neither a 7% historical CAGR nor a 5% industry growth forecast establishes sustainable growth forever. Zero growth can be a valid scenario, but is not the best baseline here without evidence of long-term stagnation.

WACC is the weighted average of the returns required by equity and debt providers, incorporating the applicable tax benefit of debt. In a conventional enterprise DCF with positive future cash flows, a higher WACC lowers their present value. It also lowers perpetual-growth terminal value by increasing the denominator, WACC minus growth. Holding operating forecasts and growth assumptions constant, the valuation therefore decreases.

Precedent transaction valuation estimates value from prices paid in acquisitions of comparable businesses, often expressed as multiples of revenue or earnings. Trading comparables instead use current market valuations of similar publicly traded companies. When a DCF substantially exceeds precedent transaction values, critically re-examine growth, margins, reinvestment, discount rates and terminal assumptions, while also checking whether the deals are genuinely comparable. The discrepancy is diagnostic evidence, not a reason to average estimates blindly or force the DCF to match acquisition prices.