How Banks Make Money

How banks make money

At their core, banks make money in two main ways -- commercial banking and investment banking.

• Commercial banking refers to products like checking accounts, auto loans, and mortgages.
• Investment banking refers to services like corporate transactions and wealth management.

Here's what each of these terms means and the different revenue streams that banks create within them.

Commercial banking

Commercial banking refers to the products and services that banks provide to individuals and small businesses. If you have a checking account at a local bank, that's a form of a commercial banking relationship. This type of banking can also be referred to as consumer banking when referring to products and services for individuals.

Just to name a few, commercial banking financial services include checking and savings accounts, mortgages, auto loans, personal loans, credit cards, lines of credit, and insurance products. They also include adjacent services such as safe deposit boxes, brokerage accounts, financial planning, and more.

Not all commercial banks offer a full line of products. For example, some banks offer certificates of deposit, or CDs, while others don't.

Investment banking

Investment banking refers to services that a bank provides to corporations, governments, high-net-worth individuals, and other entities that go beyond commercial banking activities.

Investment banks advise clients on mergers and acquisitions, corporate finance transactions, and restructurings. For example, if a business is struggling and is wondering whether bankruptcy could be the best option, it might hire an investment bank to help.

Investment banks also facilitate functions such as initial public offerings (IPOs) and debt offerings, which are known as equity and debt underwriting. They also engage in proprietary stock, bond, and currency trading activities. Finally, investment banks offer wealth and asset management services to corporations and high-net-worth individuals.

Fees

Banks make their money in a variety of ways, but most can be classified as either fees or interest income. Let's take a look at fees first.

There are many different types of fees banks can collect, both on the commercial banking and investment banking sides of the business. Here's a rundown of some of the most common fee categories:

• Overdraft or returned item fees: Banks typically assess a charge if a transaction makes a customer's account go into the negative or if it is rejected due to lack of funds. The typical overdraft fee can be as much as $35 as of 2025, but banks have been under pressure to lower these in recent years.
• Monthly account fees: With checking accounts in particular, it's common for a modest monthly fee to be assessed. There is usually a way for account holders to avoid the fee, such as by setting up direct deposit. This type of fee is common with branch-based bank accounts but not with online banks.
• Interchange fees: Interchange fees are typically charged when customers use a bank's credit or debit card to make a purchase -- but it's the merchant's bank that pays it, not you. Let's say that you have a Bank of America (BAC -1.00%) credit card and use it to make a purchase at a retail store. The retailer's bank must pay an interchange fee to the bank that issued the card -- in this case, Bank of America.
• Loan fees: Banks often charge origination fees when making loans. For example, it's not uncommon to pay an origination fee of $1,000 or more for a personal loan or a large loan such as a mortgage. 
• Other account fees: When you look at a checking or savings account's fee schedule, there is probably a list of services you could be charged for. In addition to those already discussed, common fees include non-bank ATM withdrawal fees, international debit card transaction fees, fees for money orders and cashier's checks, and wire transfer fees. 
• Investment banking fees: Banks that have investment banking operations make money from the advisory fees they charge to clients. For example, if a company wants to go public and complete an IPO, an investment bank would get advisory fees for facilitating the process and advising the company on the best course of action.

Interest income

When it comes to interest income, net interest margin is the primary revenue generator. Net interest margin, or NIM, refers to the spread between the interest income banks take in on loans and the interest the bank pays for deposits after the bank's costs are accounted for. For example, if a bank has a $100 million loan portfolio and its net income from those loans is $2 million, it has a net interest margin of 2%.

Net interest margins depend on a few factors, such as the efficiency of the particular banking institution and the various types of lending the bank specializes in.

For example, credit card loans tend to have higher interest rates (and more risk) than mortgages and auto loans. They also depend on the interest rates the bank pays on deposits.

How credit unions work

Unlike traditional banks, credit unions are nonprofit businesses.

Credit unions charge interest and fees, just like banks, but they are typically only focused on covering their expenses and not on delivering profits to shareholders. Credit unions are technically owned by their members, and their mission is to give members the best rates, fees, and yields on deposits they can while covering the costs of their operations.

Credit unions are typically designed for consumers and small business banking. They are not investment banks.