A bank is a business that holds your money, lends it out, and charges fees for those services

A bank is not a safe. It is a for-profit company licensed by the government to take deposits from customers, lend that money to other customers, and make money on the difference between what it pays you in interest and what it charges borrowers. When you put money in a bank account, you are not storing it in a vault with your name on a box. You are lending it to the bank, and the bank promises to give it back when you ask for it.

Banks exist because they solve a problem: you want your money to be safe and accessible, and borrowers want to borrow large sums they could not get from individuals. The bank sits in the middle, taking the risk that borrowers will not repay, and charging enough interest to cover that risk and make a profit. You get safety and a small return on your deposit. The bank gets to use your money to make loans.

The government regulates banks through agencies like the Federal Deposit Insurance Corporation (FDIC) and the Office of the Comptroller of the Currency (OCC). These agencies set rules about how much money banks must keep on hand, what kinds of loans they can make, and how they must treat customers. The FDIC also insures your deposits up to $250,000 per account type at each bank, so if the bank fails, you get your money back from the government.

Key Takeaways

  • A bank is a licensed business that takes your deposits, lends them to borrowers, and keeps the difference between what it pays you and what it charges them.
  • Your money in a bank account is not locked in a vault—it is lent out constantly, and the bank promises to return it on demand.
  • The FDIC insures deposits up to $250,000 per account type, so your money is protected if the bank fails.
  • Banks make money through interest on loans, fees for services, and investment activities, not by storing your cash.
  • Government regulators set rules about how much money banks must keep available and what they can do with customer deposits.

How banks use the money you deposit

When you deposit $1,000, the bank does not set that $1,000 aside for you alone. Instead, it adds your $1,000 to a pool of deposits from thousands of other customers. The bank then lends portions of that pool to people taking out mortgages, car loans, business loans, and credit lines. A mortgage borrower might receive $300,000 of pooled deposits. A small business might borrow $50,000. The bank collects interest from all these borrowers.

The bank keeps some deposits on hand in cash or highly liquid assets so it can pay you when you withdraw money or write a check. This is called the reserve requirement, and regulators set a minimum percentage. The rest of the deposits are lent out. If many customers withdraw money at once, the bank can borrow from other banks or the Federal Reserve to cover the gap. If the bank cannot cover withdrawals, it fails, and the FDIC steps in to pay depositors up to the insurance limit.

This system works because most people do not withdraw all their money at once. Banks count on steady deposits coming in while steady withdrawals go out. When that balance breaks—during a financial crisis, for example—banks can run out of cash even if they own valuable assets. This is why the 2008 financial crisis happened: banks had lent out too much money to borrowers who could not repay, and when people tried to withdraw their deposits, the banks did not have the cash.

The difference between banks and other financial institutions

A credit union works similarly to a bank but is owned by its members rather than shareholders. Credit unions typically offer lower fees and better interest rates on savings, but they have fewer branches and services. A savings and loan (or thrift) is a bank-like institution that historically focused on mortgages rather than general lending. A brokerage is not a bank—it buys and sells investments like stocks and bonds on your behalf, but it does not take deposits or make loans in the traditional sense.

A money market account or money market fund is not a bank account, even though it sounds like one. A money market account at a bank is insured by the FDIC. A money market fund is an investment product sold by a brokerage and is not insured by the FDIC, though it is regulated by the Securities and Exchange Commission (SEC). The difference matters: if the fund loses value, you lose money. If a bank account loses value, it does not—the bank absorbs the loss.

What banks charge you for and why

Banks charge overdraft fees when you spend more than your balance, monthly maintenance fees for keeping an account open, ATM fees when you use another bank's machine, and wire transfer fees when you send money electronically. Some banks charge fees for paper statements, for speaking to a teller, or for keeping a balance below a minimum. These fees are how banks make money from customers who do not borrow.

Banks also make money from interchange fees, which are charges paid by merchants when you use a debit or credit card. The merchant pays a percentage of the sale to the card network and the bank. Banks also invest deposits in stocks, bonds, and other securities, and they keep the profits from those investments. Interest income from loans is the largest source of bank revenue, but fees and investment income matter too.

You can reduce what you pay by choosing a bank with no monthly fees, maintaining a minimum balance if required, using only your bank's ATMs, and avoiding overdrafts. Some banks offer these features free; others charge for them. Comparing banks before you open an account is worth the time, because fees vary widely and can add up to hundreds of dollars per year.

How the government protects your deposits

The FDIC insures deposits at member banks up to $250,000 per depositor, per bank, per account type. This means if you have a checking account with $100,000 and a savings account with $100,000 at the same bank, both are fully insured because they are different account types. If you have $300,000 in a single checking account, only $250,000 is insured. The remaining $50,000 is at risk if the bank fails.

Joint accounts are insured separately, so if you and your spouse have a joint account with $300,000, the full amount is insured because joint accounts are a separate category. Retirement accounts like IRAs are also insured separately. If you have more than $250,000 to deposit, you can spread it across multiple banks or multiple account types to keep everything insured.

The FDIC does not insure investments held at a bank, such as stocks, bonds, or mutual funds. It also does not insure safe deposit boxes or their contents. If you keep valuables in a safe deposit box and the bank is robbed, the FDIC will not compensate you. Safe deposit box contents are your responsibility.

What happens when a bank fails

When a bank fails, the FDIC takes over and either arranges for another bank to buy the failed bank's deposits and branches, or it pays depositors directly from the insurance fund. In most cases, you can access your insured deposits within a few days. The FDIC has a website where you can check whether your bank is insured and verify your coverage.

If your deposits exceed the insurance limit, you become an unsecured creditor. This means you are in line behind secured creditors (like mortgage holders) and employees to receive whatever money is left after the bank is liquidated. In practice, you may recover some of your uninsured deposits, but there is no may provide. This is why keeping more than $250,000 at a single bank is risky unless you spread it across account types or multiple institutions.

Frequently Asked Questions

What happens to my money if I do not use my bank account?

Your money stays in the account and earns interest (usually very small) unless the account is dormant for a long time. If an account is inactive for three to five years, depending on your state, the bank may turn it over to the state as unclaimed property. You can still claim it, but you have to contact your state's unclaimed property office. The money does not disappear.

Can a bank refuse to give me my money?

A bank can delay your withdrawal if it suspects fraud or if you are withdrawing a very large amount in cash (banks must report cash withdrawals over $10,000 to the government). A bank can also freeze your account if you owe it money, if there is a legal judgment against you, or if the government places a levy on the account. In normal circumstances, you can withdraw your money on demand.

Why do banks pay such low interest on savings accounts?

Banks pay low interest because they can borrow your money cheaply and lend it out at much higher rates. A savings account might earn 0.01% while a mortgage borrower pays 6% or more. The bank keeps the difference. Interest rates on savings accounts also follow the Federal Reserve's interest rate decisions. When the Fed raises rates, banks eventually raise savings rates too, but they lag behind.

Is my money safer in a bank or under my mattress?

Your money is safer in a bank. A bank account is insured by the FDIC up to $250,000, so even if the bank fails, you get your money back. Cash under a mattress can be stolen, lost in a fire, or damaged. You also earn interest in a bank account, even if it is very small. The only reason to keep cash at home is for when ready emergencies when you cannot reach a bank.