The output is only as credible as the cash-flow forecast, discount rate, terminal assumptions and treatment of debt and shares.
1. The core idea
₹100 received today is worth more than ₹100 received years from now because capital has an opportunity cost and future cash flows carry uncertainty. DCF discounts expected future cash flows back to the present.
A simplified enterprise DCF can be represented as the present value of forecast free cash flows plus the present value of terminal value.
2. Start with the right cash flow
For an enterprise-value DCF, analysts commonly use free cash flow to the firm (FCFF): cash generated by operations after the reinvestment needed to sustain and grow the business, before payments to debt and equity holders.
A simplified conceptual bridge is: FCFF = EBIT × (1 − tax rate) + D&A − capital expenditure − increase in working capital.
Exact modelling requires careful treatment of leases, exceptional items, acquisitions and other company-specific items.
3. Forecast the business before touching the discount rate
Build revenue from business drivers where possible: volume, price, customers, capacity, market share or units. Then forecast margins, taxes, working capital and capital expenditure.
Do not begin with “the stock should be worth ₹X” and reverse-engineer the assumptions to reach that answer. Build the operating model first.
4. Worked miniature example
| Year | FCFF | Discount factor | Present value |
|---|---|---|---|
| 1 | ₹100 | 0.91 | ₹91 |
| 2 | ₹110 | 0.83 | ₹91 |
| 3 | ₹121 | 0.75 | ₹91 |
The numbers are illustrative. The point is the mechanism: future cash flows are converted into today's rupees using a discount rate.
5. WACC and the discount rate
For an enterprise DCF, the weighted average cost of capital (WACC) is commonly used. It reflects the required return demanded by providers of debt and equity, weighted by the capital structure.
Cost of equity is often estimated using a framework such as CAPM: risk-free rate + beta × equity risk premium. The appropriate inputs require judgement and should be documented.
Every assumption should have an economic rationale and be applied consistently with the cash flows being discounted.
6. Terminal value
Because a company can operate beyond the explicit forecast period, DCF models usually estimate terminal value. A perpetual-growth formulation is TV = FCF in the terminal year × (1 + g) ÷ (WACC − g).
The formula shows why terminal assumptions matter enormously. The perpetual growth rate must remain below the discount rate and should be economically defensible.
7. Exit multiple method
Another approach applies a terminal valuation multiple to a terminal metric such as EBITDA. This can be intuitive but introduces a market-multiple assumption into a model that otherwise tries to derive value from fundamentals.
8. Enterprise value to equity value
If your DCF produces enterprise value, the bridge to equity value generally requires adjustments for net debt and other relevant claims or non-operating assets. Then divide by the appropriate diluted share count.
Getting this bridge wrong can create a large apparent valuation error even when the operating model is correct.
9. Sensitivity analysis
Never present a DCF as a single precise number. Test combinations of growth, margins, WACC and terminal growth. A two-way sensitivity table can show how much the valuation depends on assumptions.
If a tiny change in WACC or terminal growth causes a huge change in value, the correct conclusion is not false precision—it is that the valuation has a wide uncertainty range.
10. Bear, base and bull cases
Build scenarios around business drivers, not arbitrary valuation targets. A bear case might combine slower volume growth and weaker margins; a bull case might require sustained share gains and disciplined reinvestment.
11. DCF traps
- extrapolating unusually high growth for too long;
- assuming margins rise without a business reason;
- using a terminal growth rate that is too aggressive;
- mixing nominal cash flows with real discount rates;
- forgetting working-capital investment;
- underestimating maintenance capex;
- ignoring dilution, debt or minority interests;
- double-counting cash or other assets.
12. What makes a DCF useful?
The goal is not to prove an intrinsic value to two decimal places. The goal is to expose the assumptions required for the current market price to make sense.
13. DCF research checklist
- ☐ Revenue drivers documented
- ☐ Margin assumptions justified
- ☐ Tax treatment consistent
- ☐ Working capital modelled
- ☐ Maintenance and growth capex considered
- ☐ Discount rate documented
- ☐ Terminal assumptions defensible
- ☐ Net debt/share-count bridge checked
- ☐ Bear/base/bull scenarios run
- ☐ Sensitivity tested
14. The most useful DCF question
Instead of asking “What is the exact fair value?”, ask: What future operating performance does today's price require? That turns valuation into an explicit set of testable assumptions.
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