Risk-Free Rate in India: Its Role in Business Valuation
Every discount rate starts from the same place: what an investor could earn with almost no risk. In valuation, that starting point is the risk-free rate. It looks like the simplest input in the model, yet it feeds every cash flow and often drives a large share of the final value. Getting it right is the first test of a defensible valuation.
What Is the Risk-Free Rate?
The risk-free rate is the return on an investment with no default risk. In India, the Government of India is treated as the closest thing to a risk-free borrower in rupee terms, so valuers use the yield on Government Securities (G-Secs).
The repo rate, the RBI's policy rate, is not the risk-free rate. It is the rate at which the RBI lends to banks for the short term. A valuation needs a rate that reflects long-term investing, which is what G-Sec yields show.
Where It Sits in the Valuation?
In the cost of equity. Under the Capital Asset Pricing Model (CAPM):
Cost of equity = Risk-free rate + Beta × Equity risk premium
The risk-free rate is the base, and everything else is added on top. If it rises by one percentage point and the other inputs stay put, the cost of equity rises by one percentage point.
In WACC. The weighted average cost of capital (WACC) blends the cost of equity and the cost of debt. Since a company's borrowing cost is also priced off government yields, the risk-free rate shows up on both sides.
In terminal value. Terminal value usually forms the largest part of a DCF. It is highly sensitive to the discount rate, so a small change in the risk-free rate can move the final value noticeably.
Choosing the Right Rate
1. Match the tenor. Most valuers in India use the 10-year G-Sec yield as a practical benchmark. Some prefer a longer-maturity yield for businesses with long-lived cash flows. Whatever you choose, state it.
2. Match the currency. If cash flows are projected in rupees, use a rupee risk-free rate. If they are in US dollars, use a dollar rate, with a consistent equity risk premium. Mixing currencies is one of the most common errors in cross-border valuations.
3. Use the valuation date. The rate should be observed on or close to the valuation date, not copied from a previous report.
4. Use a reliable source. Practitioners commonly use published G-Sec yields from the RBI, CCIL or FIMMDA. Record the source and the date.
5. Be consistent with the equity risk premium. The risk-free rate and the equity risk premium must come from compatible data. Take a premium measured against government bonds, and subtract the matching bond yield, not a different one.
Common Mistakes
- Using the repo rate or a bank deposit rate instead of a G-Sec yield.
- Using an outdated rate, such as last year's figure from an earlier report.
- Using a very short-tenor yield for long-term cash flows.
- Mixing currencies, for example a rupee yield with dollar cash flows.
- Not documenting the source and date, which leaves the number open to challenge.
Risk-free rate inputs are easy to verify, which makes them easy to challenge. Auditors reviewing Ind AS fair value measurements and impairment tests under Ind AS 36 will check them. So will tax officers reviewing transfer valuations, and investors in due diligence. A weak or undocumented rate undermines confidence in the whole discount rate, even if the rest of the model is strong.
The risk-free rate is the foundation of the discount rate. Use a government security yield, not the repo rate. Match its tenor to the cash flows and its currency to the projections. Observe it at the valuation date, cite the source, and keep it consistent with your equity risk premium. If you see a valuation that does not state its risk-free rate and where it came from, ask before accepting the number.