The discounted cash flow (DCF) method is the backbone of most income-approach valuations — and one of the most frequently misapplied. Here’s the mechanical walkthrough, and where the real judgment calls happen.
Step 1: Build the Free Cash Flow Forecast
Start from revenue and work down to unlevered free cash flow — EBIT, less taxes, plus depreciation and amortization, less capital expenditures and the change in net working capital. The forecast period is typically 5 years, extended if the business hasn’t reached a stable state by then.
Step 2: Determine the Discount Rate
For an enterprise-level DCF, this is the weighted average cost of capital (WACC), blending the cost of equity (typically via CAPM, using a risk-free rate, beta, and equity risk premium) and the after-tax cost of debt, weighted by the target capital structure. For a private company, size premiums and company-specific risk premiums are often layered on top of a public-company-derived starting point.
Step 3: Calculate the Terminal Value
Since a business is assumed to operate indefinitely, the value beyond the discrete forecast period is captured in a terminal value — usually via the Gordon Growth (perpetuity) method, or occasionally an exit multiple approach. The terminal growth rate should not exceed the long-run growth rate of the economy in which the business operates; this is one of the most common places optimistic assumptions creep in.
Step 4: Discount Everything Back to Present Value
Both the discrete-period cash flows and the terminal value are discounted back to the valuation date using the WACC, then summed to arrive at enterprise value. From there, subtract net debt (and add back any non-operating assets) to reach equity value.
Where the Real Judgment Happens
- Revenue growth assumptions: The single largest driver of value, and the easiest place for management’s optimism to outpace what the historical trend and market actually support
- Terminal value weight: In many DCFs, 60-80% of total value sits in the terminal value — meaning the whole analysis can hinge on two or three assumptions made about a period decades in the future
- Normalization adjustments: One-time items, owner compensation adjustments, and non-recurring expenses all need to be identified and corrected before the forecast is built, not after
The Practical Takeaway
A DCF is only as credible as its weakest assumption. Cross-checking the output against a market approach (guideline public companies or precedent transactions) is standard practice precisely because it’s easy for a DCF, built entirely on forward-looking assumptions, to drift from what the market would actually pay.
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