A DCF values a company from first principles and takes an afternoon. Relative valuation asks a much simpler question — what are similar businesses trading at? — and takes ten minutes. It is what almost all professional analysts actually use day to day, and its weaknesses are worth being explicit about.
The two comparisons that matter
- 1Against its peers, today
If three comparable companies trade at 22×, 25× and 27× earnings and your candidate is at 15×, something is different. Your job is to find out what — better business, worse business, or a genuine mispricing.
- 2Against its own history
Often more informative. A company that has averaged 28× over ten years and now trades at 17× is either cheap or has changed fundamentally. Its own history controls for sector, business model and accounting policy automatically.
Choosing genuine comparables
- Same business model, not just same sector. DMart and a jewellery retailer are both "retail" and have almost nothing in common economically.
- Similar growth rate. A company growing 25% deserves a higher multiple than one growing 6%. Comparing them directly is comparing nothing.
- Similar capital intensity and leverage. If debt levels differ, use EV/EBITDA rather than P/E — it is the only common multiple that accounts for borrowings.
- Similar accounting. Different depreciation policies or revenue recognition can shift reported earnings by 20% without any business difference.
Why a multiple differs — the four legitimate reasons
| Reason for a higher multiple | What to verify |
|---|---|
| Faster growth | Is it real and sustainable, or one good year? Check five years and the reinvestment runway. |
| Higher return on capital | ROCE consistently above peers justifies a premium — the company converts capital into profit more efficiently. |
| Lower risk | Less debt, more predictable cash flows, less cyclicality. Genuinely worth paying for. |
| Better governance | In India this is a large and legitimate factor. Groups with a clean record trade at persistent premiums for good reason. |
If a company trades at a discount and none of these four explain it, you may have found something. If the discount is explained by weaker growth, lower returns, higher debt or governance concerns, the discount is not an opportunity — it is the market pricing a real difference correctly.
The reverse DCF — the most useful ten minutes in valuation
Instead of asking "what is it worth?", invert the question: what does the current price already assume? Take the market price as given and solve for the growth rate needed to justify it.
How much margin of safety?
| Situation | Discount to fair value you should want |
|---|---|
| Large, predictable, clean governance, you understand it well | 15 – 25% |
| Mid-sized, decent history, some uncertainty | 25 – 35% |
| Cyclical, or heavily dependent on a forecast | 35 – 50% |
| Smallcap, thin coverage, promoter you cannot verify | 50%+ — or simply skip it |
| You cannot explain how the business makes money | No discount is sufficient |
A company trades at 14× earnings while its three closest peers trade at 24–28×. Its ROCE is 9% against their 19–22%, and debt-to-equity is 2.3 against their 0.4. Is it cheap?
Flat ka daam lagana ho toh log poochte hain "same building mein pichla kitne mein gaya?" Yahi relative valuation hai. Bas ek khatra hai: agar poori building hi mehngi hai, toh aapko sirf sabse kam mehnga mila hai, sasta nahi. Isiliye margin of safety chahiye — rate mein thodi gunjaish.
- Relative valuation is fast and is what most professionals actually use.
- It only works if the comparison set is sensibly priced — the cheapest stock in a bubble is still expensive.
- Pick your peer list before looking at the multiples.
- A discount explained by weaker growth, returns, debt or governance is not an opportunity.
- Reverse the DCF: work out what the current price already assumes, then judge that claim.
Mark it done to track your progress through the curriculum.
Common questions
Short, direct answers to what people ask about this topic.
- margin of safety meaning in investing
- A margin of safety is the gap between your estimate of what a business is worth and the lower price you actually pay for it, deliberately built in to protect against your own errors and bad luck. The larger and more uncertain the business, the wider the discount a cautious investor demands before buying — it is a buffer, not a forecast.
- relative valuation meaning
- Relative valuation prices a company by comparing its multiples, such as P/E or EV/EBITDA, against similar businesses or against its own history, rather than building a value from scratch. It is fast and is what most professional analysts use day to day, but it assumes the comparison set is sensibly priced — when a whole sector is expensive, the cheapest stock in it can still be dear.
- what is a reverse DCF
- A reverse DCF works backwards from the current share price to reveal what growth and margins the market is already assuming, instead of forecasting them yourself. It is a useful reality check: if the price implies, say, 30% growth for fifteen years, you can judge whether that is plausible far more easily than you can predict the future outright.
- re-rating and de-rating meaning in stock market
- A re-rating is when the market changes the multiple it is willing to pay for a company’s earnings — a P/E moving from 15 to 25, say — usually because its perceived quality, growth or risk has changed. A re-rating lifts the price even if profits are flat, and a de-rating does the reverse, which is why a stock can fall despite steady earnings.