A bank is a business that takes your money, keeps it safe, and lends it out to earn profit

A bank is not a government agency or a charity. It is a for-profit company licensed by the state or federal government to accept deposits, store them, and lend them to borrowers. When you put money into a bank account, you are not hiding it in a vault with your name on it. You are lending that money to the bank, and the bank pays you a small amount of interest in return. The bank then lends your money to other customers at a higher interest rate—for mortgages, car loans, credit cards, business loans—and keeps the difference as profit.

Banks are regulated by government 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 a bank must keep on hand, what kinds of loans it can make, and how it must treat customers. The FDIC also insures your deposits: if the bank fails, the FDIC will pay you back up to $250,000 per account type at that bank.

Key Takeaways

  • A bank is a licensed business that accepts your deposits, pays you interest, and lends your money to other customers at a profit.
  • The FDIC insures deposits up to $250,000 per account type, so your money is protected if the bank fails.
  • Banks are regulated by federal and state agencies that set rules about lending, capital reserves, and customer treatment.
  • You can access your money through checks, debit cards, ATMs, and electronic transfers, but the bank can place holds on deposits or freeze accounts under certain conditions.
  • Banks charge fees for services like overdrafts, wire transfers, and account maintenance, though many offer free checking and savings accounts.

How a bank makes money from your deposits

When you deposit $1,000 into a savings account, the bank does not set that $1,000 aside for you alone. It pools your money with deposits from thousands of other customers and lends it out. If the bank pays you 0.01% annual interest on your savings account, it might lend that same money to a mortgage borrower at 6.5% interest. The bank keeps the difference—about 6.49%—as profit.

Checking accounts usually earn no interest at all, so the bank keeps 100% of the profit from lending your checking balance. This is why banks offer free checking: they profit from lending your money, not from charging you a monthly fee. Some banks do charge monthly fees for checking, usually because they offer extra services like higher interest rates, cash back at more ATMs, or lower overdraft fees.

What happens when you deposit money

When you hand a teller a check or deposit cash, the bank credits your account immediately—you see the money in your balance right away. But the bank does not actually receive the funds for several days. For a check, the bank must send it through the clearing system, which involves the Federal Reserve, the other bank, and multiple processing steps. This is why banks place holds on deposits: they are waiting to confirm the money actually arrived before they let you spend it.

A hold on a check can last anywhere from one business day (for checks from the same bank) to ten business days (for large checks or checks from out-of-state banks). During the hold, the money shows in your account, but you cannot withdraw it. If you try to spend it before the hold clears and the check bounces, the bank will charge you an overdraft fee—typically $25 to $35 per transaction.

How banks protect your money

Banks use multiple layers of security. Your account is password-protected, and the bank monitors for fraud. If someone uses your debit card without permission, federal law limits your liability to $50 if you report it within two business days, and $0 if the fraud is on the card itself rather than your account number. Banks also use encryption to protect information when you log in online or use an ATM.

The FDIC insurance is the biggest protection. If your bank fails—which is rare but has happened—the FDIC will pay you back up to $250,000 for each account type you hold at that bank. A checking account and a savings account are separate types, so you could have $250,000 in checking and $250,000 in savings and be fully covered. Joint accounts are insured separately, so a joint account with your spouse gets its own $250,000 coverage.

What banks can and cannot do with your account

A bank can freeze your account if it suspects fraud, if you owe money to the bank, or if a court orders it to. The bank must tell you within one business day if it freezes your account, but it does not have to ask permission first. A freeze means you cannot withdraw money, though deposits may still post. A freeze can last days or weeks while the bank investigates.

A bank can also place a hold on funds if a check bounces or if you have a negative balance. If you overdraft your account—spend more than you have—the bank will charge you a fee and may close the account if overdrafts happen repeatedly. Some banks offer overdraft protection, which links your checking account to a savings account or credit line so that if you overdraft, the bank automatically transfers money to cover it (and charges a smaller fee than a traditional overdraft).

A bank cannot refuse to open an account based on race, religion, national origin, or other protected characteristics. It can refuse to open an account if you have a history of fraud or if you cannot provide required identification, but it must tell you why.

Types of bank accounts and what they cost

A checking account is designed for frequent deposits and withdrawals. You can write checks, use a debit card, set up automatic bill payments, and transfer money electronically. Most checking accounts earn no interest. Many banks offer free checking with no monthly fee and no minimum balance, though some charge $10 to $15 per month if your balance falls below a threshold.

A savings account is designed to hold money you are not spending right away. It earns interest, though the rate varies widely—from 0.01% at large banks to 4% or higher at online banks. Savings accounts have limits on how many withdrawals you can make per month (though this rule is less strictly enforced now). Most savings accounts have no monthly fee.

A money market account is a hybrid: it earns higher interest than a savings account but requires a larger minimum balance (often $2,500 or more) and may charge monthly fees if your balance drops below that minimum.

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 before the term ends, the bank charges a penalty, usually equal to a few months of interest.

How to choose a bank

Start by deciding what you need: free checking, high interest on savings, many ATM locations, or online banking. Large national banks like Bank of America, Wells Fargo, and Chase have thousands of branches and ATMs but often charge fees and pay low interest. Online banks like Ally, Marcus, and Discover have no branches but pay higher interest and charge fewer fees. Credit unions are member-owned and often offer better rates and lower fees than banks, though they have fewer ATMs and branches.

Check the current interest rates on savings accounts—they change frequently and vary by bank. Look at the fee structure: overdraft fees, monthly maintenance fees, ATM fees, wire transfer fees. Read reviews on sites like Trustpilot or the Better Business Bureau, but remember that people are more likely to leave reviews when they are angry than when they are satisfied.

Make sure the bank is FDIC-insured. You can search the FDIC's bank database at fdic.gov to confirm. If you have more than $250,000 to deposit, consider splitting it across multiple banks or account types to stay within FDIC coverage limits.

Frequently Asked Questions

What is the difference between a bank and a credit union?

A bank is a for-profit business owned by shareholders. A credit union is a nonprofit owned by its members. Credit unions often charge lower fees and pay higher interest, but they have fewer branches and ATMs. Both are regulated and insured—banks by the FDIC, credit unions by the NCUA (National Credit Union Administration).

Can a bank take my money if I owe a debt?

Yes, if you owe money to the bank itself (like a loan or credit card), the bank can freeze your account and take money to pay the debt. If you owe money to someone else, they must get a court judgment first, then the bank can freeze your account on the court's order. The bank will notify you, usually within one business day.

Why does my deposit have a hold on it?

The bank is waiting for the check to clear through the banking system. Until the money actually arrives from the other bank, the bank cannot be sure the check is good. If you try to spend the money before the hold clears and the check bounces, you will be charged an overdraft fee.

Is my money safe if the bank fails?

Yes, up to $250,000 per account type. The FDIC insures deposits at all member banks. If the bank fails, the FDIC will pay you back. Bank failures are rare in the United States because of strict regulation and capital requirements.

Can a bank close my account without warning?

A bank can close your account, but it must give you notice—usually 30 days. The bank does not need a reason, though common reasons include repeated overdrafts, suspected fraud, or violation of the account agreement. The bank must return your remaining balance by check or transfer.