Discounted Cash Flow (DCF)
Discounted Cash Flow (DCF) is an intrinsic valuation method that estimates the present value of a company by discounting its projected future free cash flows back to today using the Weighted Average Cost of Capital (WACC), representing the idea that a rupee received in the future is worth less than a rupee today.
DCF is considered the most theoretically rigorous valuation tool because it grounds value in the actual cash a business is expected to generate for its owners, rather than in accounting metrics or market comparisons. The two key inputs that drive any DCF model are (1) the forecast of future free cash flows and (2) the discount rate applied to those flows.
A standard DCF is built in two stages. In Stage 1, the analyst forecasts free cash flows explicitly for a defined projection period—typically 5 to 10 years. In Stage 2, a Terminal Value is calculated to capture all cash flows beyond the projection horizon. The Terminal Value is usually estimated using a perpetuity growth formula: TV = FCF_(n+1) / (WACC − g), where g is the assumed long-term growth rate. This terminal value often represents 60–80% of the total DCF value in practice, which makes the assumed long-term growth rate and discount rate the most sensitive inputs in the model.
The discount rate used in DCF is typically the WACC—a blended cost that reflects the proportional cost of equity and cost of debt. A higher WACC (driven by higher interest rates or higher equity risk premium) reduces the present value of future cash flows and therefore the DCF valuation. This mechanical relationship means DCF valuations of growth stocks are particularly sensitive to interest rate changes.
In the Indian context, DCF is widely used for valuing infrastructure companies, utilities, and businesses with visible long-term cash flow visibility such as toll roads or renewable energy projects. For high-growth consumer or technology companies with uncertain near-term profitability, DCF models require heavy assumption-making around when cash flows will normalise and what growth rates to use, making the output range very wide.
A common criticism of DCF is that it is vulnerable to the garbage-in-garbage-out problem: small changes in assumptions about growth rates or discount rates lead to very large changes in the output. A difference of 1% in terminal growth rate assumption can change the valuation by 20–30%. This is why experienced analysts always present DCF as a scenario range and cross-validate with relative valuation multiples.