Banks take your money, lend it out, and charge interest on those loans

A bank is a business that holds money for people and businesses, then lends that money to other people and businesses at a higher interest rate. The difference between what they pay you to hold your money and what they charge borrowers is how they make profit. Banks also offer other services — checking accounts, savings accounts, debit cards, wire transfers — but lending is the core business.

When you put money in a bank account, you are not just storing it in a vault with your name on it. The bank uses your deposit to fund loans to other customers. In return, the bank pays you a small amount of interest on your balance. If you borrow from the bank, you pay interest on what you owe. The bank keeps the spread.

This system only works if the bank stays trustworthy. That is why banks are heavily regulated and insured. The Federal Deposit Insurance Corporation (FDIC) insures deposits up to $250,000 per account holder, per bank. If a bank fails, the FDIC pays depositors back. This protection exists so people will trust banks with their money.

Key Takeaways

  • Banks profit by paying you interest on deposits and charging higher interest on loans they make to other customers.
  • Your deposits are insured by the FDIC up to $250,000 per account, so your money is protected if the bank fails.
  • Banks offer multiple services beyond lending: checking accounts, savings accounts, debit cards, and wire transfers.
  • Banks are regulated by federal and state agencies to may support they operate safely and do not take excessive risk with customer money.
  • Different types of banks — commercial banks, credit unions, online banks — serve different customers but operate on the same basic lending principle.

How banks make money from your deposits and loans

When you deposit $1,000 in a savings account earning 0.5% annual interest, the bank pays you $5 per year. Meanwhile, the bank lends that $1,000 (along with thousands of other deposits) to a borrower at 6% interest. The borrower pays the bank $60 per year. The bank keeps the $55 difference, minus the cost of running the branch and paying staff.

This spread — the gap between what banks pay depositors and what they charge borrowers — is the engine of banking. The wider the spread, the more profit. During periods when interest rates are high, banks can offer depositors higher rates and still make money. When rates are low, banks struggle to offer attractive rates while remaining profitable.

Banks also charge fees: monthly account maintenance, overdraft fees, wire transfer fees, ATM fees at other banks' machines. These fees are a second source of profit, separate from the lending spread. Some banks charge more fees than others, which is why comparing banks matters if you want to keep costs down.

Types of banks and how they differ

Commercial banks are the most common. They take deposits from individuals and businesses, make loans, and offer checking and savings accounts. Wells Fargo, Bank of America, and Chase are commercial banks. They have physical branches and ATMs.

Credit unions are member-owned cooperatives, not profit-driven corporations. When you open an account at a credit union, you become a member and part-owner. Credit unions typically offer lower fees and better interest rates on savings because they return profits to members rather than shareholders. You usually have to meet a membership requirement — working for a certain employer, living in a certain area, or belonging to a certain organization.

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

Savings banks and thrift institutions historically focused on mortgage lending and savings accounts rather than business lending. Today the distinction has blurred, but some still specialize in mortgages and home loans.

What regulators do and why banks need oversight

Banks are regulated by multiple agencies at the federal and state level. The Office of the Comptroller of the Currency (OCC) charters and supervises national banks. The Federal Reserve supervises large bank holding companies. State banking departments oversee state-chartered banks. Credit unions are supervised by the National Credit Union Administration (NCUA).

Regulators examine banks regularly to may support they have enough capital (money set aside as a cushion), that they are not taking excessive risk, and that they follow consumer protection laws. After the 2008 financial crisis, regulations became stricter. Banks now have to hold more capital and undergo stress tests — simulations of economic downturns — to prove they could survive a crisis.

These rules exist because when a bank fails, it can harm the entire financial system. If people lose faith in banks, they withdraw their money all at once, which can cause other banks to fail even if they are healthy. The FDIC insurance and regulatory oversight are designed to prevent panic and keep the system stable.

How to choose a bank that fits your needs

If you need to deposit cash regularly, a bank with physical branches near you matters. If you rarely use cash and are comfortable with apps, an online bank may offer better rates. If you want personal service and lower fees, a credit union might be worth joining.

Compare interest rates on savings accounts — they vary widely, from nearly 0% at some large banks to 4% or higher at online banks. Check monthly fees, overdraft fees, and minimum balance requirements. Some banks waive fees if you keep a certain balance or set up direct deposit. Others charge fees regardless.

Make sure any bank you choose is FDIC-insured (for commercial banks and savings banks) or NCUA-insured (for credit unions). You can verify this on the FDIC or NCUA website. If a bank is not insured, your deposits are not protected if the bank fails.

What happens when you borrow from a bank

When you borrow from a bank, you sign a promissory note — a legal document promising to repay the loan plus interest. The bank checks your credit history (a record of whether you have borrowed money before and paid it back on time) to decide whether to lend to you and at what interest rate.

If you have a strong credit history, you get a lower interest rate. If you have missed payments or defaulted on loans in the past, you either get a higher rate or the bank declines to lend to you. Some loans require collateral — an asset the bank can seize if you do not repay. A mortgage is secured by the house; a car loan is secured by the car.

You repay loans in regular installments over a set period. Each payment covers some of the principal (the original amount borrowed) and some of the interest. Early in the loan, most of your payment goes to interest. Later, more goes to principal. If you stop making payments, the bank can foreclose (seize the collateral) or sue you to recover the debt.

The difference between banks and other financial institutions

Investment firms and brokerage houses buy and sell stocks and bonds for customers but do not take deposits or make personal loans. Insurance companies collect premiums and pay out claims but do not lend money. Payday lenders and check-cashing services offer short-term loans or cash services but are not banks and are not FDIC-insured.

The key difference is that banks take deposits, which means they have a responsibility to keep that money safe and available. Other financial institutions do not hold customer deposits in the same way, so they face different regulations and risks.

Some large financial companies operate multiple divisions — a bank, an investment firm, and an insurance company under one corporate umbrella. But each division operates under different rules and serves different purposes.

Frequently Asked Questions

Is my money safe in a bank?

Your money is insured up to $250,000 per account at an FDIC-insured bank. If the bank fails, the FDIC pays you back. Money in checking and savings accounts is safer than money in stocks or other investments, which are not insured. Before opening an account, verify the bank is FDIC-insured on the FDIC website.

Why do banks charge overdraft fees?

An overdraft happens when you spend more money than you have in your account. Banks charge a fee (typically $25 to $35) because they are covering the cost of lending you that money temporarily. You can often opt out of overdraft coverage, which means transactions will be declined instead of charged a fee.

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

Yes, for checking and savings accounts. You can withdraw cash at an ATM or branch, or transfer money electronically. Some savings accounts have withdrawal limits, but these are rare now. If you have a certificate of deposit (CD), you agree to leave money untouched for a set period; early withdrawal costs a penalty.

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

Credit unions are member-owned and return profits to members; banks are shareholder-owned and return profits to investors. Credit unions typically offer lower fees and better rates but require membership. Both are insured — FDIC for banks, NCUA for credit unions — up to $250,000.

Do I need to use a big bank or can I use a smaller one?

Size does not determine safety — a small bank is as safe as a large one if it is FDIC-insured. Smaller banks and credit unions often offer better customer service and lower fees. The main trade-off is fewer branches and ATMs. Choose based on what services you actually use.