What banks do with your money

When you deposit money into a bank account, the bank does not lock it in a vault with your name on it. Instead, the bank lends most of that money to other customers — for mortgages, car loans, business loans, credit cards. The bank keeps a small portion in reserve (required by federal law) and uses the difference between what it pays you in interest and what it charges borrowers in interest as its profit.

This is why your savings account earns interest, and why the bank can afford to operate branches and pay employees. You are not storing money; you are lending it to the bank, which lends it onward. The bank promises to give your money back on demand, and the Federal Deposit Insurance Corporation (FDIC) guarantees that promise up to $250,000 per account holder per bank.

The money you deposit today might be loaned out tomorrow to someone buying a house or starting a business. That borrower makes payments over months or years, and those payments flow back through the system. If many borrowers stop paying at once — during an economic crisis, for example — the bank can run short of cash even though it technically owns assets (the loans). This is what causes bank failures.

Key Takeaways

  • Banks lend out most of the money you deposit to other customers, which is how they make profit and how you earn interest.
  • The FDIC insures deposits up to $250,000 per person per bank, so your money is protected even if the bank fails.
  • When you write a check or use a debit card, you are instructing your bank to move money from your account to someone else's, which takes one to three business days to clear.
  • Banks charge fees for services like overdrafts, wire transfers, and account maintenance, and these fees vary widely between institutions.
  • Your bank reports your account activity to credit bureaus only if you miss payments; normal deposits and withdrawals do not affect your credit score.

How money moves in and out of your account

When you deposit a check, the bank scans it and sends the image to the check-clearing system. The bank that issued the check (the payer's bank) verifies the account has enough money, then transfers funds to your bank. This process, called check clearing, typically takes one to three business days. Until it clears, the money is not actually yours — the bank shows it as "pending" because the transfer is not complete.

When you use a debit card at a store, the transaction goes through a payment network (Visa, Mastercard, or your bank's own system). The store's bank requests the money from your bank. Your bank checks your balance, approves or denies the transaction, and the funds move. This also takes time behind the scenes — the money may leave your account immediately, but the store does not receive it for one to three days.

Wire transfers move faster because they bypass the check-clearing system. You tell your bank to send money directly to another bank account, and the transfer usually completes the same business day. Wire transfers are also irreversible — once sent, you cannot get the money back without the recipient's cooperation — so banks charge a fee (usually $15 to $50) and require you to provide exact account details.

How banks make money and what they charge you

Banks earn money in three main ways: interest on loans, fees on services, and investment income. When you borrow money (a mortgage, car loan, or credit card), you pay interest — the bank's cut. When you use services, you pay fees. When the bank invests its own money in stocks or bonds, it keeps the profits.

Common fees include overdraft fees (charged when you spend more than your balance, typically $25 to $35 per transaction), monthly maintenance fees (usually $5 to $15, though many banks waive them if you maintain a minimum balance), wire transfer fees ($15 to $50), and ATM fees if you use another bank's machine ($2 to $3). Some banks charge fees for paper statements, account closures, or stopping a check payment.

Interest rates on savings accounts and money market accounts vary by bank and by economic conditions. In 2024, rates range from nearly 0% at some large banks to 4% to 5% at online banks and credit unions, depending on the account type and the current federal interest rate. Banks set their own rates; there is no single rate that applies everywhere.

How the Federal Reserve and interest rates affect your bank

The Federal Reserve is the central bank of the United States. It does not take deposits from regular people, but it sets a target interest rate that banks charge each other for overnight loans. This rate, called the federal funds rate, influences every other interest rate in the economy — what banks pay on savings accounts, what they charge on mortgages, what credit card companies charge on balances.

When the Federal Reserve raises its target rate, banks raise the rates they charge borrowers and lower the rates they pay savers (because money is more expensive to borrow). When the Fed lowers its rate, banks lower borrowing rates and raise savings rates (because money is cheaper to borrow). Your bank does not have to follow the Fed exactly, but market pressure usually forces it to stay competitive.

This is why your savings account interest rate changes over time, and why mortgage rates fluctuate. The Fed adjusts rates to manage inflation and employment — raising rates to cool down an overheating economy, lowering rates to stimulate borrowing and spending during a slowdown.

How banks protect your money and what FDIC insurance covers

Banks are required by law to keep a portion of deposits on hand (called reserve requirements) and to meet strict capital standards set by federal regulators. The FDIC insures deposits so that if a bank fails, you get your money back up to $250,000 per account holder per bank.

FDIC insurance covers checking accounts, savings accounts, money market accounts, and certificates of deposit (CDs). It does not cover stocks, bonds, mutual funds, or safety deposit boxes — those are not bank deposits. If you have more than $250,000 at one bank, the excess is not insured. If you have $250,000 at Bank A and $250,000 at Bank B, both are fully insured because the insurance is per bank, not per person.

Joint accounts are insured separately — if you and your spouse have a joint savings account with $500,000, the FDIC insures up to $250,000 in your name and up to $250,000 in your spouse's name, for a total of $500,000 coverage on that one account. Retirement accounts (IRAs, 401(k)s held at a bank) are also insured separately, up to $250,000 each.

How banks report your activity and what affects your credit

Banks report to credit bureaus only when you borrow money and make (or miss) payments. A checking or savings account does not appear on your credit report. Depositing money, withdrawing money, and maintaining a balance have no effect on your credit score.

However, if you overdraw your account repeatedly and the bank sends the debt to a collection agency, that can appear on your credit report and damage your score. If you have a credit card through the bank, that card's payment history does appear on your credit report. If you default on a loan (mortgage, car loan, personal loan), the bank reports it to credit bureaus and it stays on your report for seven years.

Banks also report suspicious activity to the government. If you deposit large amounts of cash frequently, the bank files a Currency Transaction Report (CTR) with the Financial Crimes Enforcement Network (FinCEN). This is routine and legal; it does not mean you have done anything wrong. The report is filed to detect money laundering and other financial crimes.

How to choose a bank and what to compare

Banks differ in fees, interest rates, branch locations, customer service, and online tools. If you rarely visit a branch and do most banking online, an online bank often offers higher interest rates and lower fees because it has no physical locations to maintain. If you need in-person service and cash deposits, a traditional bank or credit union may be worth the lower rates.

Compare checking account fees (monthly maintenance, overdraft, ATM), savings account interest rates, and minimum balance requirements. Some banks waive fees if you maintain a certain balance or set up direct deposit. Credit unions are member-owned and often offer lower fees and better rates than banks, but you must be a member to open an account (membership is usually based on where you work, where you live, or a group you belong to).

Read the fine print on any account before opening it. Banks change fees and rates, so what was true when you opened the account may not be true a year later. Most banks allow you to close an account and move your money to another bank at any time, with no penalty.

What happens when a bank fails

Bank failures are rare in the United States because of FDIC insurance and federal regulation. When a bank does fail, the FDIC steps in, takes over the bank's assets, and pays depositors up to $250,000 per account. This process usually takes a few days. You can access your money through ATMs or debit cards within a day or two, and the FDIC mails a check for any amount over $250,000 (though you will not receive this amount because it exceeds the insurance limit).

If you have accounts at multiple banks, each bank's failure is handled separately. Your $250,000 at Bank A is insured, and your $250,000 at Bank B is insured, even if both banks fail at the same time. The FDIC has a fund built from bank premiums (fees banks pay) to cover these payouts.

During the 2008 financial crisis, the FDIC raised the insurance limit temporarily from $100,000 to $250,000 to restore confidence. It has remained at $250,000 since then. The FDIC maintains a list of failed banks on its website if you want to see how often this actually happens — the answer is very rarely.

Frequently Asked Questions

Why does it take three days for money to clear?

Checks and electronic transfers move through a clearing system that processes millions of transactions daily. The delay allows the sending bank to verify funds exist and the receiving bank to confirm the account is valid. Faster payment systems exist (like real-time payments through the Federal Reserve's FedNow service), but most banks have not yet adopted them.

Can a bank take my money if I owe them?

Yes. If you have a loan or credit card with the bank and you default, the bank can seize funds in your checking or savings account to cover the debt. This is called a setoff. The bank must notify you first, but it can legally take the money. If you owe money to a creditor who is not your bank, they must get a court judgment before they can seize your account.

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

Banks are for-profit businesses owned by shareholders. Credit unions are nonprofit organizations owned by their members. Credit unions often offer lower fees and better rates, but you must meet membership requirements. Both are insured by the FDIC (banks) or NCUA (credit unions) up to $250,000 per account.

Do I need to keep cash at home if my bank fails?

No. FDIC insurance means your money is protected up to $250,000 even if the bank fails. The FDIC has never failed to pay an insured deposit. Keeping large amounts of cash at home exposes you to theft and fire with no insurance protection.

Can a bank freeze my account without warning?

A bank can freeze your account if it suspects fraud or illegal activity, and it must notify you within a reasonable time. If you owe a debt and a creditor obtains a court judgment, the bank can freeze your account to satisfy the judgment. If you have multiple overdrafts or bounced checks, the bank may close your account, though it must give you time to withdraw remaining funds.