Short answer: Banking stocks are shares in companies that earn most of their income from lending money and taking deposits. Their prices are shaped by economic cycles, inflation, monetary policy and interest rate trends, as well as by each bank’s asset quality, capital and costs.
Last reviewed: 12 November 2026
At a glance
| Term | What it tells you | Better when |
|---|---|---|
| Capital adequacy ratio | Bank capital divided by risk-weighted assets, showing its ability to absorb losses | Higher |
| Non-performing asset (NPA) ratio | Share of loans that no longer generate income, usually because borrowers have defaulted | Lower |
| Cost-to-income ratio | Operating expenses divided by operating income | Lower |
| CASA ratio | Share of funding from current and savings account deposits, which are low-cost and stable | Higher |
What exactly is a banking stock?
A stock is a share of ownership in a company, and it trades on a stock exchange such as the NSE or BSE. A banking stock is a share in a company whose core business is banking. Think of a bank as a business that borrows money from depositors and lends it out to individuals and businesses.
The bank’s income comes mainly from the gap between the interest it charges on loans and the interest it pays on deposits. When that gap is wide and loans are repaid on time, the business tends to look healthy. When borrowers stop paying, the same business can quickly look weaker.
Which numbers show whether a bank is sound?
Banks publish several ratios in their results and annual reports. The capital adequacy ratio divides a bank’s capital by its risk-weighted assets, which are its loans and other holdings adjusted for how risky they are. A higher ratio means a larger buffer against failure.
Here is a hypothetical example, with invented numbers. Suppose Bank A has ₹100 crore of capital and ₹1,000 crore of risk-weighted assets. Its capital adequacy ratio is ₹100 crore divided by ₹1,000 crore, which is 10 per cent.
The NPA ratio measures loans that have stopped earning income. In the same hypothetical, if Bank A has ₹1,000 crore of loans and ₹50 crore of them have gone bad, its NPA ratio is 5 per cent. A lower NPA ratio points to better asset quality.
The cost-to-income ratio divides operating expenses by operating income. If Bank A earns ₹100 crore in operating income and spends ₹60 crore on running costs, the ratio is 60 per cent. A lower figure means the bank spends less to earn each rupee.
What drives bank share prices?
Bank stock performance is sensitive to economic cycles, meaning the alternating periods of growth and slowdown in the economy. A bank’s loan book depends on borrowers being able to repay, and that ability is closely tied to the broader economy.
Monetary policy is set by the Reserve Bank of India, which influences the general level of interest rates. Interest rate trends matter because they affect how much banks earn on loans compared with what they pay on deposits. Inflation, the steady rise in prices, can push rates up and raise running costs, so it also feeds into bank earnings.
Funding mix matters too. CASA deposits are low-cost, stable funding because they pay low interest and customers rarely withdraw them. A higher CASA ratio is generally a positive sign for a bank, because it can lend without relying as heavily on more expensive borrowing.
What are the catches with banking stocks?
The first catch is that no single ratio tells the whole story. Using the hypothetical Bank A, a 10 per cent capital adequacy ratio is a buffer, not a guarantee. If its NPA ratio rose from 5 per cent to 8 per cent, another ₹30 crore of its ₹1,000 crore loan book would stop earning income, and that would eat into both profit and capital.
The second catch is that many banks respond to the same forces. When the economy slows or inflation shifts, loan repayments and interest rates can move across the sector at once. Holding several banks does not remove this shared exposure.
The third catch is that a bank can look strong on one measure while weakening on another. A low cost-to-income ratio, for example, does not show whether the bank’s loans are being repaid. Reading the ratios together gives a fuller picture than reading any one of them alone.
Frequently asked questions
Does a high capital adequacy ratio mean a bank cannot fail?
No. A higher capital adequacy ratio means a larger buffer against failure and a greater ability to absorb losses, but it does not rule out failure.
Does a lower NPA ratio always mean a better bank?
A lower NPA ratio indicates better asset quality, meaning a smaller share of loans has stopped generating income. It measures one aspect of a bank, so it is best read alongside capital, costs and funding.
Why are CASA deposits considered a positive sign?
CASA deposits are low-cost and stable because they pay low interest and customers rarely withdraw them. A higher CASA ratio is generally a positive sign for a bank.
Are banking stocks affected by interest rates?
Yes. Bank stock performance is sensitive to interest rate trends and monetary policy, along with economic cycles and inflation.
Sources and last check
Facts in this article were checked against the sources below on 12 November 2026. Rules and figures can change; check the primary source before acting.
- kotakneo.com (broker education)
- icicidirect.com (broker education)
- 5paisa.com (broker education)
- upstox.com (broker education)
This article is general information, not investment advice. MyFinanceBandhu is not a SEBI-registered investment adviser.