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

A bank is a licensed financial institution that takes deposits from customers, holds that money in accounts, lends portions of it to other customers or businesses, and makes profit from 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 cash in a vault with your name on it — you are lending that money to the bank, and the bank promises to give it back when you ask.

Banks are regulated by federal and state authorities. The Federal Deposit Insurance Corporation (FDIC) insures deposits up to $250,000 per account holder per bank, which means if the bank fails, the government will reimburse you up to that amount. This insurance exists because banks lend out most of the money customers deposit, so they do not actually have all customer funds sitting in a vault at any moment.

The core function is straightforward: banks are middlemen between people who have money and people who need to borrow it. They take a cut of that transaction through interest rates, monthly fees, overdraft charges, and other services.

Key Takeaways

  • Banks hold your deposits and lend that money to borrowers, keeping the profit from the interest rate difference.
  • The FDIC insures deposits up to $250,000 per account holder per bank if the bank fails.
  • Banks make money through interest on loans, monthly account fees, overdraft fees, and charges for services like wire transfers.
  • Different types of banks — commercial banks, credit unions, online banks — operate under the same basic model but with different fee structures and service levels.
  • Your money moves between banks through clearing systems like the Federal Reserve and the ACH network, which is why transfers take time.

How banks make money from your account

When you deposit $1,000 in a checking account, the bank now has that $1,000 to lend. If the bank lends it to a borrower at 6% interest, the borrower pays the bank $60 per year. If the bank pays you 0.01% interest on your checking balance, it pays you 10 cents per year. The bank keeps the difference: $59.90. Multiply that across thousands of accounts and millions of dollars, and the profit is substantial.

Banks also charge you directly. A monthly maintenance fee ($10 to $15 on many accounts) is pure revenue. An overdraft fee ($30 to $35 when you spend more than your balance) is another direct charge. Wire transfer fees, ATM fees at other banks' machines, and fees for stopping a check payment all add up. Some banks charge inactivity fees if you do not use the account for a set period.

The interest rate a bank pays you on savings or money market accounts is typically higher than on checking accounts, but still far lower than the rate it charges borrowers. A savings account might earn 4% to 5% annually right now, while a personal loan from the same bank might cost 8% to 12%. The bank profits from that spread.

Types of banks and how they differ

Commercial banks are the most common — Chase, Bank of America, Wells Fargo, and thousands of smaller regional banks. They offer checking and savings accounts, issue credit cards, make loans, and provide investment services. They are for-profit businesses owned by shareholders.

Credit unions are member-owned cooperatives, not for-profit institutions. When you open an account at a credit union, you become a member and partial owner. Credit unions typically charge lower fees and pay slightly higher interest on savings because they do not need to generate profit for shareholders. However, credit unions have smaller networks — you may have fewer ATMs and branches available. Credit unions are also insured by the National Credit Union Administration (NCUA), which works the same way as FDIC insurance.

Online banks have no physical branches and operate entirely through websites and apps. Because they have lower overhead costs, they often pay higher interest on savings accounts and charge lower fees than brick-and-mortar banks. The trade-off is that you cannot walk into a location to deposit cash or speak to someone in person. Online banks are still FDIC-insured if they are federally chartered.

Investment banks and savings banks are more specialized. Investment banks handle large corporate transactions, mergers, and securities trading. Savings banks focus primarily on mortgages and savings products. Most people interact with commercial banks or credit unions for everyday banking.

How money moves between banks

When you transfer money from your account at Bank A to someone's account at Bank B, the money does not move when ready. Instead, both banks send messages through clearing systems that tell each bank to adjust the account balances. The Federal Reserve operates one major clearing system; the ACH (Automated Clearing House) network operates another. These systems batch up thousands of transactions and settle them in waves, which is why transfers typically take one to three business days.

A wire transfer is faster because it moves through a different system — SWIFT for international transfers, or the Fedwire system for domestic transfers. Wire transfers often settle the same day or next business day, but they cost more ($15 to $50 per transfer) and cannot be reversed once sent. ACH transfers are slower but free or very cheap ($0 to $3).

When you write a check, the bank that receives it deposits it into their account at the Federal Reserve. The Federal Reserve then collects the check from your bank and deducts the amount from your account. This process, called check clearing, takes two to five business days depending on the distance between banks and the time of day the check is deposited.

What happens when a bank fails

If a bank becomes insolvent — meaning it has lost so much money that it cannot cover customer deposits — the FDIC steps in. The FDIC does not bail out the bank; instead, it pays depositors directly up to $250,000 per account. If you have $300,000 in a single checking account at a failed bank, you lose $50,000. If you have $200,000 in a checking account and $100,000 in a savings account at the same bank, both are covered because they are separate account types.

The FDIC then sells the failed bank's assets (loans, real estate, investments) to another bank or liquidates them. Depositors usually regain access to their insured funds within a few days. Bank failures are rare in the modern era because regulators monitor banks constantly and require them to maintain minimum capital reserves.

The difference between a bank account and actual cash

When you deposit cash into a bank account, that physical cash becomes the bank's property. You now own a claim against the bank — a promise that the bank will give you that money back in cash or transfer it elsewhere when you ask. You do not own the specific bills you handed over. This is why banks can lend out deposits: they own the money, and you own the promise to get it back.

This distinction matters when a bank fails. You are not waiting for the bank to find your specific cash; you are waiting for the FDIC to pay your claim. It also matters for taxes and legal disputes — if someone sues you, they can potentially freeze your bank account, but they cannot take the physical cash you keep at home.

Regulations that protect you and limit what banks can do

Banks operate under strict rules set by federal and state regulators. The Office of the Comptroller of the Currency (OCC) regulates national banks. State banking authorities regulate state-chartered banks. The Federal Reserve oversees bank holding companies and sets interest rates that influence what banks charge and pay.

These regulators require banks to maintain minimum capital reserves, conduct regular audits, and report suspicious activity. Banks must also follow Know Your Customer (KYC) rules, which require them to verify your identity when you open an account and monitor for money laundering. This is why banks ask for government ID and sometimes ask questions about the source of large deposits.

Consumer protection laws like the Truth in Lending Act require banks to disclose fees and interest rates clearly. The Fair Credit Reporting Act limits how banks can use your credit information. These rules exist because banks have enormous power over your money, and regulators try to prevent abuse.

Frequently Asked Questions

Is my money safe in a bank?

Your money is insured up to $250,000 per account type per bank by the FDIC (or NCUA for credit unions). If the bank fails, you will be paid back. If the bank is robbed or hacked, the bank is responsible for replacing the money, not you. Banks are required to maintain security systems and report breaches.

Why do banks charge fees if they already make money from lending?

Fees are additional profit. A bank with millions of accounts can charge $12 per month to each account and generate enormous revenue with minimal cost. Fees also discourage certain behaviors — overdraft fees discourage spending more than you have, and inactivity fees discourage dormant accounts that cost the bank money to maintain.

What is the difference between a debit card and a credit card from a bank?

A debit card draws money directly from your bank account — you spend money you already have. A credit card is a loan from the bank that you repay later, usually with interest if you do not pay the full balance. Banks make more profit from credit cards because they charge interest and merchant fees.

Can a bank refuse to open an account for me?

Yes. Banks can refuse service for any reason except discrimination based on race, religion, national origin, or other protected categories. Banks often refuse accounts to people with a history of fraud, unpaid overdrafts at other banks, or suspicious activity patterns. You can ask why you were denied and request reconsideration.

What happens to my money if I die?

Your bank account becomes part of your estate. If you named a beneficiary on the account, that person can claim the money directly without going through probate. If you did not name a beneficiary, the money goes through your will or state intestacy laws, which can take months or years. Naming a beneficiary is free and takes minutes.