Banks take deposits, lend money, and move payments between accounts

A bank is a business that holds your money in an account, lends it to other customers, and processes the payments you make. When you deposit a paycheck or transfer funds, the bank records the transaction, keeps the money in a vault or at a central reserve, and makes it available when you withdraw it or pay someone else. Banks charge fees for some services and earn money by lending your deposits to borrowers at a higher interest rate than they pay you.

The core job of a bank is to be a middleman between savers and borrowers. You give the bank money to hold; the bank lends most of that money to people buying homes or cars or starting businesses; those borrowers pay interest; the bank keeps some of that interest as profit and pays you a small amount as interest on your deposit. This cycle repeats millions of times a day across thousands of accounts.

Key Takeaways

  • Banks hold your deposits in accounts, keep them secure, and let you withdraw or transfer money on demand.
  • Banks lend out most of the money deposited with them, which is how they earn the money to pay you interest and cover their costs.
  • The Federal Deposit Insurance Corporation (FDIC) insures deposits up to $250,000 per account holder per bank, so your money is protected even if the bank fails.
  • Banks charge fees for overdrafts, transfers, account maintenance, and other services; these fees vary widely between banks and account types.
  • When you use a debit card, write a check, or set up a direct deposit, the bank processes that transaction and moves money between accounts.

How banks keep your money safe and available

When you deposit money at a bank, you do not hand it to a teller who puts it in a box with your name on it. Instead, the bank credits your account with that amount and becomes responsible for having that money available whenever you ask for it. The bank keeps some cash in the branch for daily withdrawals, stores larger amounts in a vault, and keeps the rest at a central reserve or invests it in short-term securities it can sell quickly if needed.

Banks are required by federal law to keep a minimum amount of cash on hand relative to the deposits they hold. This reserve requirement ensures that if many customers withdraw money on the same day, the bank can pay them. The Federal Reserve sets these requirements and monitors whether banks meet them. If a bank fails to keep enough reserves, regulators can shut it down before it runs out of money entirely.

The Federal Deposit Insurance Corporation (FDIC) insures your deposits up to $250,000 per account holder per bank. This means if the bank closes or goes bankrupt, the FDIC will pay you back up to that limit from a fund it maintains. If you have more than $250,000 at one bank, only the first $250,000 is insured; the rest is at risk. If you have accounts at two different banks, each account is insured separately up to $250,000.

What banks do with the money you deposit

Banks do not keep all your deposits sitting in a vault. Federal law allows banks to lend out most of what they receive, as long as they keep enough in reserve to cover withdrawals. A typical bank might keep 10 to 15 percent of deposits on hand and lend out the rest. When you deposit $1,000, the bank might lend $900 of it to someone buying a car, keep $100 in reserve, and use the interest the car buyer pays to cover the bank's costs and pay you interest on your deposit.

This lending is how banks make money. If a customer borrows $100,000 to buy a house at 6 percent interest, the bank collects $6,000 per year in interest payments. If the bank paid you 0.5 percent interest on your deposit, it cost the bank $500 per year to hold your money. The difference—$5,500—goes toward the bank's staff, buildings, technology, and profit. The more money a bank lends out, the more interest it collects, but the more risk it takes if borrowers stop paying.

Banks manage this risk by checking whether borrowers can afford to repay before lending to them. They look at credit scores, income, existing debts, and the value of anything you are using as collateral. A bank will not lend $300,000 to someone earning $30,000 per year, because the math does not work. This screening protects both the borrower from taking on debt they cannot handle and the bank from losing money on bad loans.

How banks process payments and transfers

When you swipe a debit card at a store, write a check, or set up a direct deposit from your employer, the bank processes that transaction. For a debit card purchase, the bank checks that you have enough money in your account, holds that amount, and sends a message to the store's bank confirming the payment. The store's bank receives the money, and the store's account is credited. This happens in seconds for card transactions and takes one to two business days for checks and transfers.

Direct deposits work differently. Your employer's bank sends an electronic file to a clearinghouse—a central system that sorts payments by receiving bank—with instructions to deposit your paycheck into your account. The clearinghouse routes the file to your bank, your bank credits your account, and the money is available the next business day or sometimes the same day, depending on the banks involved and the time the deposit was sent.

Banks charge fees when you use certain payment methods or exceed account limits. An overdraft fee applies if you spend more than your balance; a wire transfer fee covers the cost of sending money to another bank; a monthly maintenance fee covers the cost of running the account. These fees vary widely. Some banks charge $35 per overdraft; others charge $0. Some charge $25 to wire money; others charge $15. Shopping around for a bank with low fees can save you hundreds of dollars per year.

Different types of bank accounts and what they offer

Banks offer several account types, each with different rules and benefits. A checking account is designed for frequent deposits and withdrawals; you can write checks, use a debit card, and set up automatic payments. A savings account is designed to hold money you do not spend regularly; it pays interest but limits how many withdrawals you can make per month. A money market account is a hybrid that pays higher interest than a savings account but requires a larger minimum balance and limits withdrawals.

A certificate of deposit (CD) is an account where you agree to leave money untouched for a set period—three months, one year, five years—in exchange for a higher interest rate. If you withdraw the money early, the bank charges a penalty. CDs are useful if you have money you know you will not need for a specific time and want to earn more interest than a savings account offers.

Banks also offer individual retirement accounts (IRAs), which are tax-advantaged accounts for retirement savings. Money you put into an IRA grows tax-free until you withdraw it in retirement. Banks offer traditional IRAs, where contributions may be tax-deductible, and Roth IRAs, where contributions are not deductible but withdrawals in retirement are tax-free.

How banks are regulated and what happens if one fails

Banks are regulated by multiple federal and state agencies. The Office of the Comptroller of the Currency (OCC) oversees national banks. The Federal Reserve oversees bank holding companies and state-chartered banks that are members of the Federal Reserve System. State banking regulators oversee state-chartered banks that are not Federal Reserve members. These agencies examine banks regularly to ensure they are following the law, keeping enough reserves, and not taking excessive risks.

If a bank fails, the FDIC takes over. It pays out insured deposits up to $250,000 per account holder, sells the bank's assets to recover money, and may arrange for another bank to take over the failed bank's operations. Uninsured deposits—amounts over $250,000—may recover some money from the sale of assets, but there is no may provide. This is why keeping more than $250,000 at a single bank is risky; the amount over $250,000 is not protected.

Bank failures are rare in the United States because of regulation and deposit insurance. Between 2000 and 2023, fewer than 600 banks failed out of more than 5,000 in operation. Most people never experience a bank failure. But if you have more than $250,000 to deposit, spreading it across multiple banks ensures all of it is insured.

What banks do not do and what other financial institutions handle

Banks are not the only place to put money or borrow it. Credit unions are member-owned cooperatives that offer checking and savings accounts similar to banks but often with lower fees and higher interest rates. Investment firms like Vanguard and Fidelity hold stocks, bonds, and mutual funds; they do not offer checking accounts or FDIC insurance. Insurance companies sell policies and manage claims; they do not hold deposits. Mortgage lenders may not be banks; some are independent companies that originate loans and sell them to banks or investors.

A bank can do some of these things—a bank might have an investment division or an insurance subsidiary—but the core bank function is deposits, lending, and payment processing. If you want to buy stocks, you need a brokerage account, not a bank account. If you want to borrow money for a car, you can go to a bank, a credit union, or a captive finance company owned by the car manufacturer. Understanding which institution does what helps you choose the right place for each financial need.

Frequently Asked Questions

What happens to my money if the bank goes out of business?

The FDIC insures deposits up to $250,000 per account holder per bank. If the bank fails, the FDIC pays you back up to that limit within a few days. Amounts over $250,000 may recover some money from the sale of the bank's assets, but there is no may provide. To protect more than $250,000, open accounts at different banks.

Why do banks charge overdraft fees if I spend more than my balance?

Banks charge overdraft fees because they are covering the cost of lending you money instantly when you do not have it. When you overdraft, the bank pays the merchant and then charges you a fee—typically $25 to $35—for that short-term loan. Some banks offer overdraft protection, which links your checking account to a savings account and transfers money automatically to cover the shortfall.

Can I get my money out of the bank whenever I want?

Yes, for checking and savings accounts. You can withdraw cash at an ATM, write a check, or transfer money to another account at any time. Savings accounts have a limit on how many withdrawals you can make per month without penalty, but this limit is rarely enforced. CDs and IRAs have different rules; withdrawing early from a CD costs a penalty, and withdrawing early from an IRA before age 59½ costs taxes and penalties.

How do banks decide whether to lend me money?

Banks look at your credit score, income, existing debts, and the value of collateral you can offer. A higher credit score, stable income, low existing debt, and valuable collateral make you a lower-risk borrower, so banks are more likely to lend to you and offer better interest rates. You can check your credit score for free at annualcreditreport.com, which is the official government site for free credit reports.

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

A bank is safer. Money under a mattress can be stolen, lost in a fire, or damaged. Money at an FDIC-insured bank is protected up to $250,000 and is available whenever you need it. Banks also pay interest on deposits, so your money grows over time. The only reason to keep cash at home is for emergencies when you cannot reach a bank or ATM.