A discounted cash flow model is the only valuation method derived from first principles rather than from comparison. It says: estimate all future cash the business will produce for owners, adjust each year for the fact that money later is worth less than money now, and add it up.
Why a rupee later is worth less
Two reasons. First, you could invest a rupee today and have more than a rupee next year — so a future rupee must be discounted to be comparable. Second, a future rupee is uncertain, and uncertainty deserves compensation. Both are captured in the discount rate.
- r
- Discount rate — your required annual return
- n
- Number of years in the future
Example: ₹100 received in 10 years, discounted at 12%, is worth ₹32 today. At 15% it is worth ₹25. That sensitivity to the discount rate is not a flaw in the model — it is the reason two thoughtful analysts can value the same company very differently and both be reasonable.
Choosing a discount rate
Formally this is the weighted average cost of capital — a blend of the cost of debt and the cost of equity, weighted by how much of each the company uses. In practice most investors simplify, and the simplification is defensible.
| Business type | Reasonable discount rate | Reasoning |
|---|---|---|
| Large, stable, low debt (HUL, TCS) | 10 – 12% | Predictable cash flows, modest risk |
| Mid-sized, moderate debt | 13 – 15% | More uncertainty in both growth and survival |
| Cyclical or highly leveraged | 16 – 20% | Cash flows may not arrive at all in bad years |
| Small, unproven, illiquid | 20%+ | High failure probability and no exit liquidity |
Terminal value — where the model gets dangerous
You cannot forecast individual years to infinity, so a DCF forecasts explicitly for 5–10 years and then bundles everything after into a single terminal value, usually via the Gordon growth formula.
- g
- Perpetual growth rate — growth forever, after the forecast period
- r
- Discount rate
Example: Note what happens as g approaches r: the denominator shrinks towards zero and value explodes towards infinity. This is not a bug; it is the maths telling you that a company cannot grow faster than its discount rate forever.
What a DCF is actually for
Anyone who quotes a DCF target price to the rupee has misunderstood the tool. Small changes to growth or discount assumptions move the answer by 30–50%. That sensitivity is not a weakness to be hidden — it is the model's most honest output.
- 1Run a sensitivity grid, not a point estimate
Vary the growth rate and discount rate across a realistic range and produce a table of values. You will get a spread — say ₹620 to ₹1,150. That range is the answer.
- 2Reverse the question
Far more useful than "what is it worth?" is "what does the current price imply?" If a stock at ₹2,000 requires 22% growth for fifteen years to justify itself, you now have a concrete, checkable claim to evaluate.
- 3Use it to test the story, not to generate a target
The model’s value is in forcing you to state your assumptions explicitly. Most bad investments come from assumptions that were never articulated, not from arithmetic errors.
In a DCF, terminal value accounts for 82% of the total valuation. What should that tell you?
Ek taxi mahine ka ₹20,000 bachati hai aur 8 saal chalegi. Toh woh ₹19 lakh ki nahi hui — kyunki aaj ka ₹20,000 aur 8 saal baad ka ₹20,000 barabar nahi hote. DCF bas aage aane wale paise ko aaj ki keemat mein badalta hai. Sundar tareeka hai, par andaza galat toh jawab bhi galat.
- A DCF is the only valuation method built from first principles.
- The discount rate captures both time value and risk.
- Perpetual growth must never exceed long-run nominal GDP growth.
- Terminal value typically dominates the result, which is where the fragility lives.
- Use a DCF to produce a range and to test assumptions — never a target price.
Mark it done to track your progress through the curriculum.
Common questions
Short, direct answers to what people ask about this topic.
- DCF meaning in valuation
- A discounted cash flow, or DCF, values a business by estimating all the cash it will produce for owners in future and discounting each year back to what it is worth today, because money later is worth less than money now. It is the only valuation method built from first principles rather than comparison — and also the one most sensitive to its own assumptions.
- terminal value meaning in DCF
- Terminal value is the estimated worth of all the cash a business will produce beyond the explicit forecast period of a DCF, usually five or ten years, collapsed into a single figure. Because a business is assumed to continue for decades, the terminal value often makes up the majority of the total valuation — which is precisely why the assumptions behind it deserve the most scrutiny.
- WACC full form
- WACC stands for weighted average cost of capital — the blended return a company must earn to satisfy both its lenders and its shareholders, weighted by how much of each it uses. It is commonly used as the discount rate in a DCF, on the logic that the business must at least clear the cost of the money funding it.
- why is a DCF so sensitive to the discount rate
- Because the discount rate is applied year after year through compounding, so a small change in it swings the present value of distant cash flows sharply — ₹100 due in ten years is worth about ₹32 at a 12% rate but only ₹25 at 15%. This sensitivity is not a flaw but the reason two careful analysts can value the same company very differently and both be reasonable.