Key Functions of Commercial Banks Explained

Every time you open a savings account, swipe a debit card, or take a business loan, you are relying on a system that Indian law defined nearly eight decades ago and that still shapes how money moves through the economy today. Commercial banks are the most visible part of that system, yet most people only think about them when they need to deposit a cheque or apply for credit. Understanding what these institutions actually do – beyond the branch counter – makes it much easier to grasp topics like credit creation, foreign trade finance, and monetary policy that come up throughout a commerce syllabus.

What legally makes a bank a “commercial” bank 🔗

Under the Banking Regulation Act, 1949, banking is defined as accepting deposits from the public for the purpose of lending or investment, with those funds repayable on demand or otherwise and withdrawable by cheque, draft, or similar instruments. This single definition explains almost everything a commercial bank does. It exists to pool small, scattered savings from millions of depositors and channel that money into loans, investments, and other productive uses, earning a margin between what it pays depositors and what it charges borrowers.

Commercial banks in India include public sector banks, private banks, foreign banks operating locally, and regional rural banks. All of them perform two broad sets of activities: primary functions, which form the core of banking, and secondary functions, which add convenience and additional revenue streams.

Primary functions of commercial banks 🔗

Primary functions are the ones a bank cannot exist without. They are what separates a bank from any other financial company.

Accepting deposits: current, savings, and fixed accounts 🔗

The first job of a commercial bank is collecting money from the public in a form that suits different needs. Broadly, three types of deposit accounts serve this purpose. A current account is meant for businesses that need to make frequent transactions and does not usually pay interest, though it often comes with an overdraft facility. A savings account is designed for individuals who want a safe place to park money while earning modest interest, with some restrictions on the number of free withdrawals. A fixed deposit locks in a sum for a set period at a higher, pre-agreed interest rate, making it attractive for people who do not need immediate liquidity, as explained in this overview of how commercial banks structure their deposit products.

Depositors do not have to worry about losing everything if a bank runs into trouble. The Deposit Insurance and Credit Guarantee Corporation, a wholly owned subsidiary of the RBI, insures the principal and interest on savings, current, recurring, and fixed deposits up to a combined limit of five lakh rupees per depositor per bank. This safety net is one reason commercial banks remain the preferred place for household savings over informal lenders.

Loans and advances: cash credit, demand loans, and short-term loans 🔗

Once a bank has collected deposits, it puts that money to work by lending. This is where banks generate most of their income, since the interest charged on loans is higher than the interest paid on deposits.

• Cash credit is a revolving facility where a business is sanctioned a borrowing limit against collateral like inventory or receivables, and interest is charged only on the amount actually drawn rather than the full sanctioned limit, a structure detailed by the Corporate Finance Institute’s explanation of cash credit.
• Demand loans are loans without a fixed repayment schedule, which the bank can technically call back at any time, though in practice they are used for short, predictable funding needs.
• Short-term loans cover working capital requirements, seasonal expenses, or temporary cash shortfalls, typically repayable within a year and often secured against tangible assets.

These lending products fuel everything from a small trader restocking inventory before a festival season to a manufacturer bridging the gap between production costs and payment from buyers.

Secondary functions that go beyond deposits and loans 🔗

Secondary functions do not define a bank the way accepting deposits and lending do, but they make banks far more useful to businesses, traders, and everyday customers. They also generate fee-based income that does not depend on interest rate cycles.

Discounting bills of exchange 🔗

A bill of exchange is a written order for one party to pay another a fixed sum by a certain date. When a business holding such a bill needs cash before the maturity date, the bank buys the bill at a discount, deducting a commission, and collects the full amount from the debtor when it falls due. This service, described in the same breakdown of primary and secondary banking functions, gives traders quick access to working capital without waiting for buyers to pay.

Credit creation: how one deposit becomes many loans 🔗

Credit creation is arguably the most important economic function commercial banks perform. When a bank receives a deposit, it is not required to hold the entire amount in reserve. It keeps a portion as required reserves and lends out the rest. That loan amount typically gets deposited in another bank, which again keeps a fraction and lends the remainder, and the cycle repeats. This process, explained in detail in this guide to credit creation for commerce students, means the total credit generated in the economy is a multiple of the original deposit, with the multiplier determined largely by the reserve ratio set by the RBI. This is exactly why the RBI’s cash reserve ratio and repo rate decisions have such a large effect on how much credit is available in the economy.

Financing foreign trade 🔗

Commercial banks support importers and exporters through letters of credit, foreign currency loans, and forex remittance services. A letter of credit guarantees payment to an exporter once shipping documents are verified, reducing the risk of dealing with an unfamiliar overseas buyer. Banks also handle currency conversion and cross-border fund transfers, functions that keep India’s trade with the rest of the world running smoothly.

Overdraft facility 🔗

An overdraft allows a current account holder to withdraw more money than is actually in the account, up to a pre-approved limit. Interest is charged only on the overdrawn amount for the period it remains unpaid, not on the entire sanctioned limit, which makes it a flexible short-term borrowing tool for businesses managing uneven cash flows.

Acting as an agent for customers 🔗

Banks also perform agency services on behalf of customers. These include collecting cheques, dividends, and interest warrants; making payments such as insurance premiums and utility bills; buying and selling securities; and acting as a trustee or executor for a customer’s estate. Essentially, the bank becomes a financial representative, handling routine transactions so customers do not have to manage them individually.

General utility services 🔗

Beyond deposits, loans, and agency work, banks offer a set of general utility services that make daily financial life easier. These include issuing traveller’s cheques and demand drafts, providing safe deposit lockers, offering foreign exchange services, and enabling digital payment options like UPI. Locker services in particular are closely regulated. Following Supreme Court directions, the RBI introduced revised locker guidelines rolled out between 2023 and 2025 that require banks to sign updated agreements with customers, restrict what can be stored in lockers, and clarify liability in case of theft or damage.

Why these functions matter beyond the exam syllabus 🔗

Every function described above connects to a larger economic role. Deposits mobilise household savings that would otherwise sit idle. Loans turn those savings into productive investment. Credit creation expands the money supply and gives the RBI a lever to manage inflation and growth. Trade finance keeps Indian exporters competitive globally. Agency and utility services build the trust that keeps customers banking formally instead of relying on unregulated moneylenders. Together, these functions explain why commercial banks are treated as the backbone of a modern financial system rather than just a place to store money.

What do you think? Which of these functions do you interact with most often in daily life, and has learning about credit creation changed how you think about the loan your bank offers you?

References

1. https://www.indiacode.nic.in/bitstream/123456789/1885/1/aa1949-10.pdf
2. https://www.geeksforgeeks.org/macroeconomics/functions-of-commercial-bank-primary-functions-and-secondary-functions/
3. https://www.dicgc.org.in/guide-to-deposit-insurance
4. https://corporatefinanceinstitute.com/resources/wealth-management/cash-credit
5. https://testbook.com/ugc-net-commerce/functions-of-commercial-banks
6. https://www.outlookmoney.com/banking/rbis-new-bank-locker-rules-what-you-need-to-know-before-december-2025