What Is DCF (Discounted Cash Flow) Valuation? A Step-by-Step Guide to Estimating Intrinsic Value

Discounted Cash Flow (DCF) valuation is a method used to estimate the intrinsic value of a company based on its expected future cash flows. The core principle is that a business is worth the sum of all the cash it will generate in the future, adjusted for the time value of money. In other words, a rupee today is worth more than a rupee tomorrow because money can be invested to earn returns over time.

The DCF model works by projecting a company's future free cash flows over a forecast period (typically 5 to 10 years), discounting them back to their present value using an appropriate discount rate, and then adding a terminal value to account for cash flows beyond the forecast period. The result is the estimated enterprise value, from which you subtract debt and add cash to arrive at the equity value or intrinsic value per share.

DCF is widely considered the most theoretically sound valuation method because it focuses on cash generation rather than accounting profits or market sentiment. It is used extensively by professional investors, including Warren Buffett, who emphasizes buying businesses at a significant discount to their intrinsic value. To understand how this fits into the broader valuation toolkit, see our guide on stock valuation introduction.

The first step in building a DCF model is forecasting the company's future free cash flows. Free cash flow (FCF) is the cash a company generates after accounting for capital expenditures needed to maintain or grow its asset base. You typically start with the company's historical financial statements, identify trends in revenue growth, operating margins, tax rates, and capital intensity, then project these forward based on reasonable assumptions.

For example, if you are valuing a company like Infosys, you would study its historical revenue growth rates (say 10-15% annually), operating margins (around 25%), tax rates, and capital expenditure as a percentage of revenue. You would then project these forward, typically with growth declining over time as the company matures. Each year's projected free cash flow is calculated as: (Revenue × Operating Margin × (1 - Tax Rate)) + Depreciation − Capital Expenditure − Change in Working Capital.

The quality of your cash flow forecast directly determines the reliability of your DCF valuation. Use conservative assumptions, cross-check with industry growth rates, and examine the company's competitive advantages. For a deeper look at free cash flow calculation, refer to our article on free cash flow.

The discount rate is used to convert future cash flows into their present value. The most commonly used discount rate in DCF analysis is the Weighted Average Cost of Capital (WACC), which represents the blended cost of a company's debt and equity financing. WACC accounts for both the time value of money and the riskiness of the expected cash flows — riskier companies have higher WACC, which reduces their present value.

To calculate WACC, you need the cost of equity (estimated using the Capital Asset Pricing Model), the after-tax cost of debt, and the proportions of debt and equity in the company's capital structure. For a company like HDFC Bank, the cost of equity might be around 11-13% depending on the risk-free rate and beta, while the after-tax cost of debt is typically lower, around 6-8%. The blended WACC for most large Indian companies ranges between 10% and 15%.

A higher discount rate reduces the present value of future cash flows, making the valuation more conservative. A 1% change in WACC can change the valuation by 10-20%, so selecting the right discount rate is critical. See our detailed guide on WACC for a complete explanation of how to calculate it.

Since you cannot forecast cash flows indefinitely, the DCF model incorporates a terminal value to capture the value of all cash flows beyond the forecast period. The terminal value often accounts for 60-80% of the total DCF valuation, making it one of the most important and sensitive inputs in the model. There are two primary methods for calculating terminal value.

The perpetuity growth method assumes that the company's free cash flows will grow at a constant rate forever. The formula is: Terminal Value = FCF in final year × (1 + growth rate) / (WACC − growth rate). The growth rate should be conservative, typically set at or below the long-term GDP growth rate (around 3-5% for India). The exit multiple method applies a valuation multiple (like EV/EBITDA) to the company's projected final year financial metric.

For example, if Reliance Industries has a projected final year FCF of ’50,000 crore, a WACC of 11%, and a terminal growth rate of 4%, the terminal value using the perpetuity method would be approximately ’50,000 × 1.04 / (0.11 − 0.04) = ’7,42,857 crore. This single number would likely represent over 70% of Reliance's total DCF value. Learn more in our guide on terminal value in DCF.

Once you have forecast the cash flows, calculated the terminal value, and determined the discount rate, you can compute the intrinsic value. The process involves discounting each year's projected free cash flow to its present value, discounting the terminal value to its present value, and summing them to get the enterprise value. From enterprise value, you subtract net debt (total debt minus cash and equivalents) to arrive at equity value, which you then divide by the number of outstanding shares to get the intrinsic value per share.

For a practical example, consider valuing TCS using DCF. Suppose TCS generates ’40,000 crore in free cash flow, growing at 12% for 5 years then tapering to 5%, with a WACC of 11% and terminal growth of 4%. After discounting each year's cash flow and the terminal value, you might arrive at an enterprise value of ’12,00,000 crore. Subtracting net debt and dividing by shares outstanding gives an intrinsic value of around ’3,300 per share. If TCS is trading at ’3,800, it would appear overvalued relative to its DCF.

The final step is to compare the intrinsic value to the current market price. If the intrinsic value is significantly above the market price, the stock may be undervalued and represent a buying opportunity. The difference between intrinsic value and market price is your margin of safety. Check our explanation of intrinsic value for more context.

While DCF is theoretically rigorous, it has significant limitations that every investor should understand. The model is extremely sensitive to assumptions. Small changes in the growth rate, discount rate, or terminal value can swing the valuation by 30-50% or more. This is why DCF should always be presented as a range of values rather than a single point estimate. Additionally, DCF is less useful for companies with unpredictable cash flows, such as early-stage startups, cyclical businesses, or commodity companies.

Best practices for DCF include: using conservative assumptions rather than optimistic ones, cross-checking your results with relative valuation methods like PE ratio or EV/EBITDA, performing sensitivity analysis on key variables, and comparing your implied growth rates with industry growth rates. Always sanity-check your DCF output — if the model says a stock should be worth 10 times its current price, your assumptions are probably too aggressive.

For most retail investors, DCF is best used as a framework for thinking about what is priced into a stock rather than as a precision valuation tool. Combine DCF with relative valuation and qualitative analysis for a complete picture. See our article on common DCF mistakes to avoid the most frequent errors.

Ready to apply DCF valuation? Use our stock screeners to find companies with strong cash flows, or explore our market data to research financial statements. This content is educational and does not constitute financial advice.