How to Value a Stock Using DCF: A Step-by-Step Walkthrough
u/myraison-detre28 ·
Reddit — r/ValueInvesting
· March 12, 2026 at 05:23
· ⬆ 15 pts
· 💬 21 comments
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Summary
The post provides a step-by-step guide on how to perform a Discounted Cash Flow (DCF) valuation for a stock, using a hypothetical stable industrial company as an example.
The author's thesis is that DCF, when built with defensible assumptions and rigorous sensitivity analysis, is a highly valuable exercise for investors, forcing them to articulate their growth and risk expectations for a business.
Quality assessment: This is an educational post explaining a valuation methodology, not company-specific due diligence. It is a high-quality explanation of a common financial modeling technique.
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DCF has a reputation problem. Most dismissals come from people who've only seen models reverse-engineered to justify a predetermined price target. Built honestly with defensible assumptions and real sensitivity analysis, it's one of the more useful exercises you can do before committing capital.
Here's a practical walkthrough. Hypothetical stable industrial company generating $500M in free cash flow. FCF is operating cash flow minus capex.
Forecast FCF for years 1 through 10 with a two-stage approach. Years 1 to 5 at 6% annual growth, conservative for a mature industrial. Years 6 to 10 at 3% as the business matures further. Year 1 FCF: $530M. Year 10: roughly $776M. The goal is a defensible central case, not precision.
Discount rate at 9% as a baseline for most US equities, representing the return required for taking on equity risk. Quality business with durable FCF, I'll go to 8%. Something cyclical or levered, 11 to 12%.
Terminal value is where most of the value lives and most of the risk sits. Year-10 FCF of $776M, 3% terminal growth, 9% discount rate: terminal value = (776 × 1.03) / (0.09 - 0.03) = roughly $13.3B. This typically accounts for 60 to 70% of total model value, which is exactly why it deserves the most scrutiny.
Sum the present values of years 1 through 10 plus the discounted terminal value. At a 9% discount rate this company's intrinsic value lands around $10 to $11B. Compare to market cap.
The sensitivity table is the step most people skip and probably the most important. A 1% change in terminal growth rate swings intrinsic value by 15 to 25%. Run a grid across discount rates and terminal growth rates. If the stock looks undervalued across most combinations in that grid, the margin of safety is real. If it only works at the most optimistic corner of the table, that's useful information too.
For the historical FCF inputs I use valuesense rather than pulling 10-Ks manually. The sensitivity analysis stays in a spreadsheet where the assumptions stay under direct control.
The model forces you to articulate exactly why you believe a business grows at a specific rate over a specific period. That's the actual exercise.