A bank is a business that holds your money, lets you move it around, and lends it out to other people—then pays you a small amount for letting them use it.
When you put money into a bank account, you are not storing cash in a vault with your name on it. You are lending that money to the bank. The bank takes your deposit, lends most of it to other customers (mortgages, car loans, credit cards), and pays you interest—a percentage of your balance—as payment for the use of your money. The bank keeps the difference between what it pays you and what it charges borrowers.
A bank is also a regulated business. It must follow federal rules about how much money it keeps on hand, how it treats customer deposits, and what it can do with loans. The Federal Deposit Insurance Corporation (FDIC) insures deposits up to $250,000 per account holder per bank, which means if the bank fails, you get your money back from the government.
Key Takeaways
- A bank holds your money and lends most of it to other borrowers, paying you interest in return.
- Banks are regulated by federal agencies and must maintain minimum reserves and follow lending rules.
- The FDIC insures deposits up to $250,000 per person per bank if the bank fails.
- Banks make money by charging borrowers more interest than they pay depositors.
- Not all financial institutions are banks—credit unions, online-only lenders, and payment apps work differently.
How banks move your money and charge for it
When you make a payment from your bank account—a check, a debit card purchase, an ACH transfer—the bank processes that transaction and deducts the amount from your balance. The bank does not move physical cash; it updates numbers in its computer system and coordinates with other banks to settle the payment. This is called clearing a transaction.
Banks charge fees for some of these services. A monthly maintenance fee covers the cost of keeping your account open. An overdraft fee applies if you spend more than your balance (though many banks now waive this). ATM fees appear if you withdraw cash from a machine that does not belong to your bank's network. Wire transfer fees, stop-payment fees, and returned-check fees are also common. The fees vary widely by bank and account type.
Some banks offer accounts with no monthly fee if you meet conditions—direct deposit of your paycheck, a minimum balance, or a certain number of debit card transactions per month. Reading the fee schedule before you open an account tells you what you will actually pay.
The difference between a bank and other places that hold money
A credit union is a nonprofit organization owned by its members. It works similarly to a bank—you deposit money, it lends to members, you earn interest—but it does not have shareholders and typically charges lower fees. Credit unions are also FDIC-insured up to $250,000. The trade-off is that credit unions have fewer branches and ATMs than large banks.
An online-only bank has no physical locations but offers checking and savings accounts, often with higher interest rates and lower fees because it has no building costs. It is still a bank and still FDIC-insured. The drawback is that you cannot walk in to deposit cash or speak to someone in person.
A payment app like Venmo, PayPal, or Square Cash is not a bank. It holds your money in a separate account, not a bank account, and that money may not be FDIC-insured. These apps are fast for peer-to-peer transfers but are not the same as a bank account for bills or savings.
A brokerage (like Fidelity or Charles Schwab) lets you buy and sell investments but is not a bank. Some brokerages offer cash management accounts that work like checking accounts, but the money is held differently and insured differently than a bank deposit.
What happens to your money after you deposit it
The bank does not keep your deposit sitting in a vault. Federal rules require banks to keep only a small percentage of deposits on hand as a reserve. The rest is lent out. A mortgage lender borrows your money (along with deposits from thousands of other customers) to lend to someone buying a house. A credit card company borrows your money to fund purchases by cardholders. A car loan company borrows your money to finance vehicles.
The borrowers pay interest on those loans. The bank keeps some of that interest as profit and passes some to you as interest on your savings account. If you have $10,000 in a savings account earning 4% annual interest, you earn $400 per year. The bank lends that $10,000 (plus millions more) at 6% or higher, keeping the difference.
This system only works if borrowers pay back their loans. When they do not, the bank loses money. During recessions or housing crashes, loan defaults spike, and banks can fail. That is why the FDIC exists—to protect depositors when a bank collapses.
How banks make decisions about who to lend to
Banks do not lend your money directly to specific borrowers. Instead, they pool deposits and use them to fund loans based on their own lending criteria. A bank decides whether to approve a mortgage, car loan, or credit card based on the borrower's credit score, income, employment history, and debt-to-income ratio. The bank assumes the risk that the borrower will not pay back the loan.
This is why banks care about your credit score when you apply for a loan. Your score reflects your history of paying bills on time. A higher score means the bank thinks you are more likely to repay, so it offers better interest rates. A lower score means higher rates or outright rejection.
Banks also use your deposits to fund loans to businesses. A small business borrows money to buy equipment or hire staff. A developer borrows to build an apartment building. These loans are riskier than consumer loans, so banks charge higher interest rates.
What protections exist if something goes wrong
The FDIC insures your deposits up to $250,000 per account holder per bank. This means if the bank fails, the FDIC pays you back in full (up to the limit) from a fund supported by bank insurance premiums. You do not have to do anything; the insurance is automatic.
If you have more than $250,000, you can spread it across multiple banks to keep all of it insured. For example, $250,000 at Bank A and $250,000 at Bank B are both fully insured. Accounts in different ownership categories at the same bank are also insured separately—a joint account and a single account at the same bank each get $250,000 coverage.
If a bank makes an error on your account—a wrong deposit amount, a transaction posted twice—you can dispute it. Federal law gives you up to 60 days to report an error. The bank must investigate and correct it or explain why the transaction was correct. During the investigation, the bank typically credits your account so you have access to the money while they look into it.
If someone uses your debit card or account number without permission, you have liability limits. If you report the fraud within two business days, your liability is capped at $50. If you wait longer, it can go up to $500. If you wait more than 60 days, you may lose all the money taken.
Why banks charge interest differently on savings and checking
A checking account is designed for frequent deposits and withdrawals. You write checks, use a debit card, set up automatic bill payments. Banks earn money from overdraft fees and from lending out your balance, but they do not pay much interest because they expect you to move money in and out constantly.
A savings account is designed for money you are not spending right now. The bank can lend out your balance for longer periods, so it pays you more interest. In exchange, you usually cannot write checks or make unlimited transfers. Some savings accounts limit you to six withdrawals per month (though this rule is less common now).
A money market account is a hybrid. It pays interest closer to a savings account but lets you write a limited number of checks. A certificate of deposit (CD) locks your money away for a set period (three months to five years) in exchange for a higher interest rate. If you withdraw early, you pay a penalty.
Interest rates vary by bank and change based on what the Federal Reserve does. When the Fed raises its benchmark rate, banks typically raise the interest they pay on savings. When the Fed cuts rates, savings interest falls.
Frequently Asked Questions
Is my money safe in a bank?
Your money is insured up to $250,000 per account holder per bank by the FDIC. If the bank fails, you get your money back from the government. If the bank makes an error or someone commits fraud, you have dispute rights and liability limits. The main risk is not the bank failing but you losing access to your money if you forget your password or your account is frozen due to suspected fraud.
Why do banks pay such low interest on savings accounts?
Banks pay low interest because they can lend your money at much higher rates. A savings account earning 4% while mortgages charge 6% or 7% is normal. Banks also have costs—branches, employees, technology, insurance—that come out of the interest spread. Online banks pay higher rates because they have lower costs.
Can a bank take my money if I owe a debt?
A bank can freeze your account if you owe it money (overdraft, unpaid loan) or if a court orders it to (wage garnishment, tax levy). The bank must follow legal procedures and usually gives you notice. If you owe a different creditor, they must get a court judgment before the bank can take money from your account.
What is the difference between a debit card and a credit card at a bank?
A debit card pulls money directly from your bank account—you can only spend what you have. A credit card is a loan from the bank; you spend the bank's money and pay it back later. Debit cards have fraud protection but less consumer protection than credit cards. Credit cards build credit history if you pay on time.
Do I need a bank account to receive my paycheck?
No, but most employers now require direct deposit, which needs a bank account. You can use a credit union account or an online bank account instead. Some employers still offer paper checks, but they are becoming rare. Prepaid cards and payment apps can receive direct deposit in some cases, though they are not the same as a bank account.