How to Know if a Stock Is Overvalued: A 7-Step Checklist

A stock is likely overvalued when its price assumes more growth than the business can realistically deliver. You cannot tell from the share price alone; you find out by comparing the price with earnings, assets, cash flow, history, peers and the return available from safer assets.

This article gives you a seven-step checklist you can run on any listed Indian company in about an hour, using free data. We then apply every step to one fully worked hypothetical company, and finish with a summary table you can reuse.

Before you start: gather five numbers

You will need the current share price, trailing twelve-month (TTM) earnings per share (EPS), book value per share, total debt and cash, and EBITDA (earnings before interest, tax, depreciation and amortisation). All of these are in the company’s quarterly results and annual report on the exchange website, and free screeners such as Screener.in or Trendlyne display them in one place along with 5- and 10-year history.

Use consolidated figures (which include subsidiaries) unless the company has none. Strip out exceptional or one-off items from profit before you calculate anything.

Step 1: P/E against its own history and its peers

The price-to-earnings ratio (price ÷ EPS) is the starting point. On its own it says little, so compare it two ways. First, with the company’s own 5-year average or median P/E: a stock trading well above its usual multiple needs a reason, such as faster growth or better margins. Second, with the median P/E of three to five direct competitors, or the sectoral index P/E shown on NSE’s website.

A premium of 20% or more on both counts is worth investigating. If you need a refresher on trailing vs forward P/E and why sectors differ, see our P/E ratio explainer.

Step 2: PEG ratio

PEG = P/E ÷ annual EPS growth rate (in %). It asks whether the P/E is justified by growth. A PEG near 1 is often considered reasonable; above 2 means you are paying a lot for each point of growth.

Use a growth rate grounded in evidence, such as the 3- or 5-year EPS compound annual growth rate (CAGR), cross-checked with management guidance. Using next year’s most optimistic forecast makes almost anything look cheap.

Step 3: P/B for banks and NBFCs

For banks and non-banking finance companies (NBFCs), price-to-book (price ÷ book value per share) is more useful than P/E, because their balance sheets are mostly loans and investments carried close to book value. What P/B is fair depends on return on equity (ROE): a lender that consistently earns 18% ROE deserves a higher P/B than one earning 10%.

A rough sense check is: justified P/B ≈ (ROE − g) ÷ (r − g), where g is long-term growth and r is the return you require. Suppose an NBFC earns 15% ROE, can grow 10% a year, and you require 13%. Justified P/B ≈ (15 − 10) ÷ (13 − 10) = 5 ÷ 3 = 1.67. If it trades at a P/B of 3, the market expects a much higher ROE or faster growth than you do. Also check gross and net NPA (bad loan) trends, because rising bad loans quickly shrink book value.

For reference, NSE’s index data showed the Nifty Bank at a P/B of 1.64 and the Nifty PSU Bank at 1.1 (as of 1 October 2026).

Step 4: EV/EBITDA

Enterprise value (EV) = market capitalisation + total debt − cash. It is roughly what it would cost to buy the whole business, including its borrowings. Dividing EV by EBITDA gives a multiple that is not distorted by different levels of debt, tax rates or depreciation policies, which makes it better than P/E for comparing leveraged or capital-heavy companies (power, telecom, cement, infrastructure).

As with P/E, compare EV/EBITDA with the company’s own history and with peers. It is not used for banks and NBFCs, where debt is the raw material of the business.

Step 5: Earnings yield vs the 10-year G-sec yield

Earnings yield is EPS ÷ price × 100, the inverse of P/E. Compare it with the 10-year government security (G-sec) yield, which is close to a risk-free return in India. On 1 October 2026 the 10-year G-sec yield closed at about 7.21% (Investing.com, Trading Economics).

Shares normally yield less than bonds because earnings can grow. But the lower the earnings yield relative to 7.21%, the more growth you need just to match a government bond. The whole Nifty 50 was at a P/E of 19.19 on 1 October 2026 (NSE), an earnings yield of about 5.2%, so the market was about 2 percentage points below the G-sec yield. A stock with an earnings yield of 2% is asking for far more faith than the market. Our article on whether high interest rates hurt stocks explains why rising bond yields tend to compress P/E multiples.

Step 6: A simple reverse-DCF sense check

A discounted cash flow (DCF) model estimates value from future cash flows. A reverse DCF flips the question: given today’s price, what growth does the market assume? You don’t need a spreadsheet for a rough version:

1. Choose the return you want, for example 12% a year.
2. Project the price that delivers it in 10 years: today’s price × 1.12¹⁰ (1.12¹⁰ ≈ 3.11).
3. Assume a sensible P/E for a more mature company in 10 years, for example 25.
4. Required EPS in year 10 = future price ÷ exit P/E.
5. Implied growth = (required EPS ÷ today’s EPS)^1/10 − 1.

If the implied growth is well above the company’s own track record and its industry’s growth, the price is probably stretching. This ignores dividends, so it slightly overstates the growth needed for high-dividend companies.

Step 7: Red flags that valuation numbers miss

• Price up, earnings flat. If the share has risen 50% in two years while EPS barely moved, the whole gain came from a higher multiple. That re-rating can reverse just as fast.
• Promoter selling. Promoters know the business best. Steady stake sales at high prices, visible in the quarterly shareholding pattern, deserve an explanation.
• Promoter pledging. Pledged shares are collateral for promoter loans. If the price falls, lenders can sell them, pushing the price down further. Pledged holdings are disclosed in the shareholding pattern on the exchange website.
• Profit without cash. Operating cash flow consistently below net profit, or receivables growing faster than sales, suggests earnings quality is weak.
• Story-driven rallies. A theme such as defence, railways or AI driving every stock in a sector up together, regardless of each company’s numbers.

Worked example: Kavya Consumer Ltd (hypothetical)

Kavya Consumer is a fictional packaged-goods company. Here are its numbers:

• Share price ₹1,200; 10 crore shares; market cap ₹12,000 crore
• TTM net profit ₹300 crore (no exceptional items), so EPS = ₹30
• EPS 3-year CAGR: 15%
• Own 5-year average P/E: 32; peer median P/E: 35; peer median EV/EBITDA: 16
• Total debt ₹800 crore; cash ₹300 crore; EBITDA ₹600 crore
• Share price up 60% in two years; EPS up 8% in the same period; promoters sold 3% of the company and have pledged 12% of their remaining holding

The working

P/E: 1,200 ÷ 30 = 40. Against its own average: 40 ÷ 32 = 1.25, a 25% premium. Against peers: 40 ÷ 35 = 1.14, a 14% premium.

PEG: 40 ÷ 15 = 2.67, well above 2.

P/B: not the main test here, because Kavya is not a lender.

EV/EBITDA: EV = 12,000 + 800 − 300 = ₹12,500 crore. EV/EBITDA = 12,500 ÷ 600 = 20.8, against 16 for peers, a 30% premium (20.8 ÷ 16 = 1.30).

Earnings yield: 30 ÷ 1,200 = 2.5%. That is 4.71 percentage points below the 7.21% G-sec yield, and well below the Nifty’s 5.2%.

Reverse DCF: to earn 12% a year, the price must reach 1,200 × 3.106 = ₹3,727 in 10 years. At an exit P/E of 25, that needs EPS of 3,727 ÷ 25 = ₹149. Growing from ₹30 to ₹149 in 10 years requires (149 ÷ 30)^1/10 − 1 ≈ 17.4% a year, faster than Kavya’s 15% record.

Flip it around: if EPS keeps growing at 15%, it reaches 30 × 1.15¹⁰ ≈ ₹121 in 10 years. At a P/E of 25 the share would be worth about ₹3,034, a return of roughly 9.7% a year. That is above the G-sec yield, but below the 12% target, and it assumes nothing goes wrong for a decade.

Red flags: price up 60% vs EPS up 8% means most of the gain came from re-rating. Promoter selling and pledging both appear.

Checklist table

Check	How to calculate	Warning sign	Kavya Consumer	Flag?
P/E vs own 5-year average	Current P/E ÷ 5-year average	Premium above 20%	40 vs 32 (+25%)	Yes
P/E vs peers	Current P/E ÷ peer median	Premium above 20% without better growth	40 vs 35 (+14%)	Borderline
PEG	P/E ÷ EPS growth %	Above 2	2.67	Yes
P/B (banks, NBFCs)	Price ÷ book value per share, vs justified P/B	Well above (ROE − g) ÷ (r − g)	Not applicable	n/a
EV/EBITDA	(Market cap + debt − cash) ÷ EBITDA	Well above peers and history	20.8 vs 16 (+30%)	Yes
Earnings yield vs G-sec	EPS ÷ price vs 10-year G-sec	Far below G-sec and the Nifty	2.5% vs 7.21%	Yes
Reverse DCF	Implied 10-year EPS growth	Above track record	17.4% vs 15%	Yes
Price vs earnings trend	2-year price change vs EPS change	Price far ahead of EPS	+60% vs +8%	Yes
Promoter selling or pledging	Quarterly shareholding pattern	Rising sales or pledges	Sold 3%; 12% pledged	Yes

Seven clear flags and one borderline result point to a price that already assumes better-than-historical growth. That doesn’t mean the price must fall. Strong companies can stay expensive for years. It does mean the margin for error is thin, and a single weak quarter could trigger a sharp de-rating.

Common mistakes

• Using one metric. Every ratio has blind spots. A stock that fails four or five checks is a stronger signal than one that fails a single test.
• Calling cheap stocks safe. A low P/E on falling profits or high debt is often a value trap.
• Ignoring the cycle. For metals, cement and autos, peak earnings make P/E look low just before profits fall.
• Treating “overvalued” as a sell signal. Valuation tells you about expected long-term return, not next month’s price. It is most useful in a long-term investment strategy, and our guide on avoiding losses in the stock market covers position sizing for when you get it wrong.

FAQ

Which single ratio best shows if a stock is overvalued?

There isn’t one. P/E is the most widely used, but it needs growth (PEG), debt (EV/EBITDA) and history for context. For banks and NBFCs, P/B together with ROE is the better starting point.

Is a stock overvalued if its P/E is higher than the Nifty’s?

Not necessarily. Sectors trade at different multiples; on 1 October 2026, NSE showed the Nifty FMCG index at a P/E of about 30 against 19 for the Nifty 50. Compare a stock with its own history and its direct competitors instead.

How do I check promoter pledging?

Listed companies file a shareholding pattern every quarter with the stock exchanges, which shows how many promoter shares are pledged or encumbered. Screeners also display the pledge percentage and its trend.

Can an overvalued stock keep rising?

Yes, often for long periods, especially in strong markets or popular themes. Valuation affects long-term returns more than short-term price moves. Buying at a high multiple usually means lower returns later, even if the business does well.

Why compare earnings yield with the G-sec yield?

The 10-year G-sec yield is roughly the return you can earn with almost no credit risk. If a stock’s earnings yield is far below it, you are relying on strong future growth to make the extra risk of equity worthwhile.