Banks offer deposit accounts, lending, and payment services — the core operations that move money between people and institutions

A bank's main job is to hold your money in an account, lend it out to other customers, and move it where you tell it to go. When you deposit a paycheck, the bank credits your account and uses that money to fund mortgages, car loans, and business lines of credit. When you write a check or use a debit card, the bank processes that payment through the payment networks that connect all financial institutions. The bank makes money on the difference between what it pays you in interest (often very little on checking accounts) and what it charges borrowers (much more on loans). Everything else — investment accounts, credit cards, insurance products — builds on top of these three core services.

Key Takeaways

  • Deposit accounts (checking and savings) let you store money safely and access it on demand, while the bank lends that money to other customers at higher interest rates.
  • Banks process payments through networks like ACH, wire transfer, and card networks, which is why transfers between institutions take time and follow specific rules.
  • Lending services include mortgages, auto loans, personal loans, and lines of credit, each with different terms, interest rates, and collateral requirements.
  • Banks also offer investment accounts, credit cards, and wealth management services, though some of these may be handled by separate subsidiaries or partner companies.
  • The Federal Deposit Insurance Corporation (FDIC) insures deposits up to $250,000 per account category, which is why the bank you choose matters for your money's safety.

Checking and savings accounts — where your money sits and earns (or doesn't)

A checking account is designed for frequent transactions. You can deposit paychecks, withdraw cash, write checks, and use a debit card. Most checking accounts pay little to no interest, and some charge monthly fees if you don't maintain a minimum balance. A savings account is meant to hold money longer and typically pays a small amount of interest — the rate varies by bank and changes with the Federal Reserve's interest rate decisions. Some banks offer high-yield savings accounts that pay noticeably more interest, though the difference is usually a fraction of a percent.

When you deposit money, the bank doesn't lock it away in a vault with your name on it. Instead, the bank pools deposits from all customers and lends that money out. The bank is required to keep a portion in reserve (the reserve requirement varies), but most of your deposit is working as a loan to someone else. This is why banks can fail — if too many customers withdraw at once, the bank may not have enough cash on hand. The FDIC insures deposits up to $250,000 per account category (checking, savings, money market, and so on) at each bank, so your money is protected even if the bank collapses.

Payment processing — how money moves between accounts and banks

When you send money to someone else, the bank doesn't hand over physical cash. Instead, it sends an electronic instruction through one of several payment networks. The most common are the Automated Clearing House (ACH) network for direct deposits and bill payments, the Federal Reserve's wire transfer system for large or urgent transfers, and card networks like Visa and Mastercard for debit and credit card purchases.

Each network has different rules about timing and cost. An ACH transfer typically takes one to three business days because the clearing house batches transactions and settles them at set times each day. A wire transfer can move money the same day but costs $15 to $50 and cannot be reversed once sent. A debit card transaction is processed in seconds at the point of sale, but the money doesn't actually leave your account for one to three days — during that time, the bank has already deducted it from your available balance to prevent overdrafts. Understanding these timelines matters when you're paying a bill or waiting for a paycheck, because the money isn't always where you think it is.

Lending services — mortgages, auto loans, personal loans, and lines of credit

Banks lend money at interest, and the terms depend on what you're borrowing for and how risky the bank thinks you are. A mortgage is a long-term loan secured by the house itself — if you stop paying, the bank can foreclose. Interest rates on mortgages are lower than on unsecured loans because the bank has collateral. An auto loan works the same way, with the car as collateral. A personal loan is unsecured, meaning the bank has no claim on your assets if you default, so the interest rate is higher. A line of credit (sometimes called a home equity line of credit or HELOC) lets you borrow up to a set amount and pay interest only on what you use.

The interest rate you're offered depends on your credit score, income, debt-to-income ratio, and the current market rate for that type of loan. Banks use credit reports from Equifax, Experian, and TransUnion to assess risk. The better your credit, the lower your rate. Banks also set their own rates based on how much it costs them to borrow money from the Federal Reserve and other sources, so rates vary between banks even for the same borrower.

Credit cards and revolving credit — borrowing on demand with a monthly bill

A credit card is a line of revolving credit issued by a bank (or a bank's subsidiary). You can borrow up to your credit limit, and the bank sends you a bill each month. If you pay the full balance, you owe no interest. If you carry a balance, the bank charges interest at an annual percentage rate (APR) that is usually much higher than a mortgage or auto loan — often 15% to 25% depending on your creditworthiness and the card's terms. The bank also makes money from merchants, who pay a percentage of each transaction (usually 1.5% to 3%) to the card network and the bank.

Credit cards also come with additional services: fraud protection, purchase protection, travel insurance, and cash-back or points rewards. These perks are funded by the interest you pay and the merchant fees, so a card with generous rewards usually has a higher APR or annual fee.

Investment and wealth management services — stocks, bonds, and managed accounts

Many banks offer brokerage accounts where you can buy and sell stocks, bonds, mutual funds, and exchange-traded funds (ETFs). Some banks have separate investment subsidiaries (for example, Bank of America owns Merrill Lynch) to handle these services. A brokerage account is different from a deposit account — it's not FDIC insured, and the value fluctuates with the market. The bank makes money by charging commissions on trades, management fees on accounts, or a percentage of assets under management.

Wealth management is a service for customers with significant assets. A wealth manager helps you build a diversified portfolio, plan for retirement, manage taxes, and sometimes handle estate planning. This service is usually available only to customers with $250,000 or more to invest, and fees are typically 0.5% to 1% of assets per year.

Other services — safe deposit boxes, foreign exchange, and business banking

Banks offer safe deposit boxes for storing documents, jewelry, or other valuables. You rent the box for an annual fee (usually $25 to $200 depending on size), and the bank stores it in a vault. The bank is not responsible if the contents are damaged or stolen, so this is mainly for peace of mind and organization.

Banks also exchange foreign currency, though the rates are usually worse than you'd get from a currency exchange specialist. If you're traveling or doing business internationally, a bank can sell you foreign currency or wire money to another country, but fees are high and rates are marked up significantly.

Business banking is a separate product line. Banks offer business checking accounts, merchant services (to accept card payments), payroll processing, and loans tailored to small businesses. The terms and fees are different from consumer products because business accounts typically have higher transaction volumes and different regulatory requirements.

How banks are regulated and what that means for your money

Banks are regulated by the Federal Reserve, the Office of the Comptroller of the Currency (OCC), and the FDIC at the federal level, plus state banking regulators. These agencies set rules about how much capital a bank must hold, what kinds of loans it can make, and how it must manage risk. The regulations exist to prevent banks from taking excessive risk and to protect depositors.

The FDIC insurance may provide is the most important protection for you. If a bank fails, the FDIC steps in and pays depositors up to $250,000 per account category. This means your checking account, savings account, and money market account are each insured separately up to $250,000. Investment accounts and safe deposit boxes are not covered by FDIC insurance.

Frequently Asked Questions

What's the difference between a bank and a credit union?

A credit union is a member-owned cooperative, while a bank is a for-profit company. Credit unions typically offer lower fees and better interest rates on savings, but they have fewer branches and ATMs. Both are insured by the FDIC or the National Credit Union Administration (NCUA) up to $250,000 per account category.

Why does a transfer between banks take three days?

ACH transfers batch transactions and settle at fixed times each day through a clearing house. The sending bank submits the transfer, the clearing house processes it overnight, and the receiving bank credits your account the next business day. This happens three times for most transfers: submission, clearing, and settlement. Wire transfers are faster because they move through the Federal Reserve's real-time system, but they cost more and cannot be reversed.

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

Yes, if you owe the bank money (like a loan or credit card debt) and you default, the bank can freeze your account and take funds to pay what you owe. This is called a setoff. If you owe a debt to someone else, they must get a court judgment first before the bank will freeze your account.

What happens to my money if the bank fails?

The FDIC takes over the bank and pays depositors up to $250,000 per account category. If you have more than $250,000 in one account type at one bank, the amount over $250,000 is at risk. To protect larger amounts, you can split deposits across multiple banks or use different account categories (checking, savings, money market) at the same bank.

Do all banks offer the same services?

No. Large national banks like Chase and Bank of America offer the full range of services — deposits, lending, investment accounts, and wealth management. Smaller regional banks may offer only basic deposit and lending services. Online banks typically offer only deposit accounts and sometimes lending, but with lower fees and higher interest rates because they have no physical branches.