How to Analyse Bank Stocks in India: NIM, NPA, CAR and More Explained

Banks are not like other businesses. To analyse a bank stock, you need to look at metrics like NIM, NPA, CAR, and P/B ratio, not the usual revenue or EBITDA numbers.

The banking sector is the backbone of India's economy. Yet the gains are not evenly spread. The top 5 listed banks alone capture nearly 61% of the total profit generated across India's entire listed banking sector. That level of concentration means picking the right bank matters enormously.

In this guide, you will learn exactly which numbers to check, what they mean, and how to use them to judge whether a bank is worth your money.

Why Banks Are Different

A bank's raw material is money. It borrows money from depositors and lends it out to borrowers. The difference between what it earns and what it pays is its profit.

There is no factory. No inventory. No cost of goods sold.

Because banks hold public money, the Reserve Bank of India (RBI) regulates them tightly. The RBI sets rules on how much risk a bank can take and how much capital it must always keep aside.

This is why analysing a bank stock starts with a very different set of questions.

Section 1: Is the Bank Actually Making Money?

Net Interest Margin (NIM): NIM is the single most important profitability number for a bank. It tells you how much profit the bank earns on every rupee it lends out, after paying depositors.

A higher NIM means the bank is earning well on its lending book. Kotak Mahindra Bank, for instance, runs a NIM of around 4.54%, as of Q3 FY26. HDFC Bank and ICICI Bank maintain robust margins with 3.35% and 4.3%, respectively.

CASA Ratio: CASA stands for Current Account and Savings Account. Current accounts pay zero interest. Savings accounts pay around 4% to 5%. A bank with a high CASA ratio is borrowing cheaply. Cheap funding means better margins. Always check this.

Calculation: CASA Ratio = (Current Account + Savings Account Deposits) ÷ Total Deposits × 100

Cost-to-Income Ratio (CIR): This tells you how efficiently a bank runs. If the CIR is 40%, the bank spends ₹40 to earn ₹100. Lower is better.

Private banks like HDFC Bank and ICICI Bank typically run CIRs in the 39% to 41% range. PSU banks like SBI and Bank of Baroda have historically operated in the 48% to 52% range. That gap matters over time.

ROA and ROE: Return on Assets (ROA) shows how much profit the bank generates per rupee of assets. Return on Equity (ROE) shows how much it earns for shareholders.

Kotak Mahindra Bank (2.1% ROA) and HDFC Bank (2.2% ROA) are strong benchmarks to compare others against.

Section 2: Is the Bank Safe?

Capital Adequacy Ratio (CAR): Think of CAR as a shock absorber. It measures how much of its own capital a bank holds against its risky loans. Under RBI's current guidelines, public sector banks must maintain a CAR of at least 12%, while scheduled commercial private sector banks must maintain a CAR of at least 9%.

The best banks stay well above that. Kotak Mahindra Bank holds a CAR of over 22.60%. HDFC Bank sits at around 19.90%. ICICI Bank is near 17.34%, as of Q3 FY26. Higher CAR means the bank can absorb losses without collapsing.

Loans to Deposits Ratio (LDR): This shows how much of its deposits a bank has lent out. Too high, and the bank is stretched thin. If depositors suddenly want their money back, a bank with a very high LDR is vulnerable.

Section 3: How Risky Is the Loan Book?

Gross NPA and Net NPA: NPA stands for Non-Performing Asset, which is simply a bad loan where the borrower has stopped paying. Gross NPA is the total bad loans as a percentage of all loans. Net NPA subtracts the money already set aside to cover those bad loans.

HDFC Bank has historically maintained a Net NPA near 0.4%, which is among the lowest in the industry. A rising NPA is a serious red flag.

Provision Coverage Ratio (PCR): Good banks prepare for defaults before they happen. PCR tells you how much of the bad loans are already covered by the bank's own reserves. A higher PCR means greater safety.

Section 4: Is the Bank Growing?

Look at year-on-year growth in advances (loans given out) and deposits. Consistent growth in both shows the business is expanding.

Also check where the growth is coming from. Retail loans (home loans, car loans, personal loans to individuals) spread risk across millions of borrowers. Large corporate loans concentrate risk in a few big accounts. A retail-heavy loan book is generally safer.

Section 5: Is the Stock Cheap or Expensive?

Price-to-Book Ratio (P/B): Standard valuation tools like P/E ratios considered ineffective for banks. The right tool is the Price-to-Book ratio, which compares the stock's market price to the bank's book value (net assets).

Kotak Mahindra Bank, known for its efficiency, trading at a P/B of around 2.11. SBI, a PSU giant with lower returns, trading at around 1.59. A higher P/B is not automatically bad. It usually reflects the market's trust in the bank's quality and future earnings.

Section 6: Management Is Everything

Here is an insight most retail investors miss. In banking, the numbers follow the people. A bank with honest, capable leadership will show good numbers over time. A bank with weak governance will eventually show bad ones.

Check for RBI penalties, auditor comments, and frequent management changes. These are early warning signs.

Banks investing in technology and digital infrastructure are better placed for the next decade. Concentration in large corporate loans without matching capital strength is a quiet risk worth watching.

Interest rates also matter deeply. When rates rise, margins often improve. When rates fall, banks face pressure. Always read the bank's results in context of the broader rate cycle.

Quick Snapshot: Top 5 Indian Banks

The Analyst's Checklist

Before investing in any bank stock, ask these questions:

• Is NIM healthy and stable?
• Is the CASA ratio high?
• Is CIR low and improving?
• Is CAR well above 9%?
• Are NPAs low and falling?
• Is the loan book growing steadily?
• Is management trustworthy and consistent?
• Does the valuation (P/B) make sense versus peers?

No single metric tells the full story. Use them together.

Disclaimer

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