A bank is a business that holds your money and lends it out
A bank is a company licensed by the government to take deposits — money you give them to hold — and lend that money to other people and businesses. When you put money in a bank account, the bank doesn't lock it in a vault with your name on it. Instead, the bank uses your money (along with everyone else's deposits) to make loans. In return, the bank pays you interest — a small percentage of your balance — as compensation for letting them use your money. The bank makes its profit by charging borrowers a higher interest rate than it pays depositors.
This arrangement exists because it solves a problem for both sides. You get a safe place to store money and earn a small return without having to find borrowers yourself. Borrowers get access to money they need without having to convince individual savers one by one. The bank sits in the middle, managing the risk and handling the paperwork.
Banks are heavily regulated by federal and state governments specifically because they hold so much of the public's money. The Federal Deposit Insurance Corporation (FDIC), a government agency, insures deposits up to $250,000 per account holder per bank. This means if the bank fails, you get your money back — not from the bank, but from the FDIC insurance fund. This protection is one reason people trust banks with their savings.
Key Takeaways
- A bank takes your deposits, lends the money to borrowers, and pays you interest on your balance.
- The FDIC insures deposits up to $250,000 per account holder per bank, so your money is protected even if the bank fails.
- Banks are regulated by federal and state governments to protect depositors and keep the financial system stable.
- You access your money through a checking or savings account, debit card, or ATM, not by walking in and withdrawing physical cash.
- Banks charge fees for some services and earn profit from the difference between interest they pay you and interest they charge borrowers.
How banks make money from your deposits
When you deposit $1,000 in a savings account earning 4% annual interest, the bank pays you $40 per year. But the bank turns around and lends that $1,000 to someone buying a car or a house, charging them 6% or 7% interest. The bank keeps the difference — roughly 2% to 3% of the loan amount. Multiply that across thousands of depositors and millions of dollars, and the bank's profit becomes substantial.
This is why interest rates matter. When the Federal Reserve (the central bank of the United States) raises its benchmark interest rate, banks typically raise the rates they pay on savings accounts and charge on loans. When rates fall, so do both. You will see these changes reflected in your account statements and loan offers, though banks do not always pass rate changes to depositors as quickly as they pass them to borrowers.
Banks also make money from fees — monthly account maintenance fees, overdraft fees, wire transfer fees, ATM fees, and others. Not all banks charge all these fees, and some accounts waive them if you meet certain conditions (like maintaining a minimum balance or setting up direct deposit). Understanding a bank's fee structure is important when choosing where to open an account.
What banks do besides hold money
Banks offer several services beyond basic deposit accounts. They issue debit cards, which let you spend money directly from your account without writing a check. They provide credit cards, which are loans the bank extends to you that you repay monthly. They process wire transfers and ACH transfers (electronic transfers between accounts), which is how most people move money today instead of mailing checks.
Banks also offer loans — mortgages for home purchases, auto loans for cars, personal loans for other needs. They provide safe deposit boxes where you can store important documents or valuables. Some banks offer investment services, though many people use separate investment firms for stocks and bonds.
For businesses, banks provide merchant services (the ability to accept credit card payments), business loans, payroll processing, and cash management. The services available depend on the bank's size and focus. A small community bank may offer basic accounts and mortgages. A large national bank offers nearly everything. Online banks typically offer fewer services but lower fees.
The difference between banks and credit unions
A credit union is similar to a bank but structured differently. Credit unions are not-for-profit organizations owned by their members (the people who have accounts there), whereas banks are for-profit companies owned by shareholders. Because credit unions do not need to generate profit for owners, they often pay higher interest on savings and charge lower fees and interest rates on loans.
Credit unions are also insured by the government — through the National Credit Union Administration (NCUA) rather than the FDIC — up to the same $250,000 limit. The main trade-off is that credit unions are typically smaller and may have fewer branches and services than large banks. Many credit unions are also restricted to people who work in a certain industry, live in a certain area, or belong to a certain organization, though this is changing.
What happens to your money when you deposit it
When you hand a teller $500 or deposit a check through an ATM, the bank credits your account when ready (or within one business day for checks). But the physical cash or the check itself does not sit in a vault labeled with your name. Instead, the bank adds $500 to its pool of deposits and uses that money to fund loans, buy securities, or hold as required reserves.
The bank keeps a fraction of all deposits on hand as reserves — cash available to withdraw. The Federal Reserve sets a minimum reserve requirement (currently zero for most banks, though this can change). Beyond that, banks decide how much cash to keep based on how much they expect customers to withdraw on any given day. The rest is lent out or invested.
This is why banks can fail. If too many customers try to withdraw money at once — a situation called a bank run — and the bank does not have enough cash on hand, the bank cannot pay everyone. This is rare in the modern era because of FDIC insurance and Federal Reserve support, but it is the reason the system exists.
Types of banks and how to choose one
National banks are chartered and regulated by the federal government and operate across state lines. State banks are chartered by individual states and regulated by both state and federal authorities. Community banks are typically smaller, locally owned institutions. Online banks operate only through websites and apps, with no physical branches.
Each type has trade-offs. National and large regional banks offer the most branches and services but often charge higher fees. Community banks offer personal service and may have lower fees but fewer services. Online banks offer the lowest fees and highest interest rates but require you to be comfortable banking entirely through a computer or phone.
When choosing a bank, consider: Does it have branches or ATMs near you? What are the monthly fees and minimum balance requirements? What interest rate does it pay on savings? What is the customer service like? Is it FDIC-insured? You do not need to stay with your first bank — switching is free and takes a few days — so it is worth shopping around.
How banks are regulated and insured
Banks operate under a system of overlapping regulation. The Federal Reserve sets monetary policy and supervises large banks. The Office of the Comptroller of the Currency (OCC) charters and regulates national banks. State banking departments regulate state-chartered banks. The Consumer Financial Protection Bureau (CFPB) enforces consumer protection laws.
This regulation exists to prevent banks from taking excessive risks, to may support they treat customers fairly, and to maintain stability in the financial system. Banks must undergo regular audits, maintain certain capital levels, and follow rules about what they can do with deposits. If a bank fails despite these safeguards, the FDIC takes over, sells the bank's assets, and uses the proceeds to pay depositors up to the $250,000 insurance limit.
You can check whether a bank is FDIC-insured by searching the FDIC's Bank Find tool on its website. You can also file a complaint with the CFPB if a bank treats you unfairly or violates consumer protection rules.
Frequently Asked Questions
What happens to my money if the bank goes out of business?
The FDIC takes over the bank and pays you back up to $250,000 per account. If you have more than $250,000 in one bank, the amount over $250,000 is at risk. To protect larger amounts, spread deposits across multiple banks or use different account types (a joint account counts separately from an individual account).
Why do banks charge overdraft fees?
An overdraft happens when you spend more money than you have in your account. Banks charge a fee (typically $25 to $35) because they have to cover the negative balance and process the transaction. You can avoid overdrafts by linking a savings account as backup or by opting out of overdraft coverage (though then transactions may be declined instead).
Can I trust an online bank with my money?
Yes, if it is FDIC-insured. Online banks are regulated the same way as brick-and-mortar banks and carry the same FDIC insurance. The main difference is convenience and cost — online banks have lower overhead, so they often pay higher interest and charge lower fees. The trade-off is no physical branch to visit.
Why do banks ask so many questions when I open an account?
Banks are required by federal law to verify your identity and check whether you are on government watchlists for money laundering or terrorism financing. This is called Know Your Customer (KYC) compliance. It protects both the bank and the financial system, though it means you will need to provide a government ID and sometimes proof of address.
What is the difference between a debit card and a credit card?
A debit card spends money you already have in your account. A credit card is a loan from the bank that you repay later. Debit cards offer less fraud protection than credit cards, but credit cards charge interest if you do not pay the full balance monthly. Both are useful for different purposes.