Banks get money from deposits, borrowing, and investments — not from a central vault

When you put money in a bank account, that money does not sit in a locked box with your name on it. Banks take the deposits you and millions of other customers make and use that money to lend to other people and businesses. The interest borrowers pay on those loans is how banks make profit. Banks also borrow money themselves — from other banks, from the Federal Reserve, and from investors who buy bank bonds — to have enough cash on hand to cover withdrawals and to fund more loans.

This system works because not everyone withdraws their money at the same time. A bank might hold $100 million in customer deposits and lend out $80 million of it, keeping $20 million available for daily withdrawals. If a bank runs out of cash or loses customer trust, the Federal Deposit Insurance Corporation (FDIC) steps in to protect depositors up to $250,000 per account.

Key Takeaways

  • Banks fund their operations primarily through customer deposits, which they then lend out at higher interest rates than they pay depositors.
  • Banks borrow money from the Federal Reserve, other banks, and investors to maintain enough cash for withdrawals and to expand lending.
  • The difference between what banks pay depositors and what they charge borrowers — called the interest spread — is their main source of profit.
  • The FDIC insures deposits up to $250,000 per account, which protects your money if a bank fails.
  • Banks also earn money through fees for services like overdraft protection, wire transfers, and account maintenance.

How deposits become loans

When you deposit $1,000 into a checking account, the bank does not lock that money away. Instead, it enters your account balance into a ledger and uses your money — along with deposits from thousands of other customers — to make loans. A bank might lend $800 of your $1,000 to a small business owner buying equipment, and another $150 to a homebuyer. The bank keeps roughly $50 in reserve to cover your withdrawal if you need it.

The bank charges the business owner 7% interest on the $800 loan and the homebuyer 5% on their mortgage. Meanwhile, the bank pays you 0.01% interest on your $1,000 deposit. The bank keeps the difference — roughly 5% to 7% on each loan — as profit. This spread between what banks pay depositors and what they charge borrowers is their primary income source.

Banks are required by law to keep a minimum amount of cash on hand, called the reserve requirement. The Federal Reserve sets this requirement, which varies based on the size of the bank and the type of deposit. This rule ensures banks cannot lend out every dollar and leave themselves unable to cover withdrawals.

Borrowing from the Federal Reserve and other banks

Banks do not always have enough customer deposits to meet lending demand. When a bank needs cash quickly, it borrows from the Federal Reserve, which is the central bank of the United States. The Federal Reserve lends money to banks at an interest rate called the discount rate. Banks also borrow from each other overnight through the federal funds market, which is how banks balance their cash reserves at the end of each business day.

If a bank has extra cash at the end of the day, it lends that money to another bank that is short on cash. These overnight loans happen at the federal funds rate, which the Federal Reserve influences but does not set directly. When the Federal Reserve raises the discount rate, banks pay more to borrow, which usually leads them to raise the interest rates they charge customers. When the rate drops, banks tend to lower customer rates.

Large banks also borrow money by issuing bonds and other debt securities that investors buy. A bank might issue a $500 million bond that pays 4% interest per year. Investors buy these bonds, and the bank uses that $500 million to fund loans and operations. This is a longer-term source of funding than borrowing from the Federal Reserve or other banks.

Fees and other income sources

Interest on loans is not a bank's only income. Banks charge fees for many services: overdraft fees when you spend more than your balance, wire transfer fees, ATM fees, monthly account maintenance fees, and fees for stopping a check payment. Some banks charge fees for opening an account or closing it early. These fees vary widely by bank and account type.

Banks also earn money by investing customer deposits in stocks, bonds, and other securities. A bank might take some of the cash it holds and buy government bonds that pay interest. Banks also charge fees to manage investment accounts, provide financial advice, and process credit card transactions. Credit card companies (often owned by banks) earn a percentage of every purchase made with their card, called an interchange fee.

What happens when a bank fails

A bank fails when it runs out of money and cannot cover customer withdrawals. This can happen if too many borrowers default on loans, if the bank makes bad investments, or if customers lose confidence and withdraw their money all at once (called a bank run). When a bank fails, the FDIC takes over and pays depositors up to $250,000 per account from an insurance fund.

The FDIC insurance limit applies per depositor, per bank, per account type. 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 different account types. If you have $300,000 in one checking account, only $250,000 is covered. Money in joint accounts is insured separately — each owner's share up to $250,000.

Banks pay into the FDIC insurance fund through premiums based on the size of their deposits and their risk profile. Riskier banks pay higher premiums. This system has worked since 1933, and no depositor with FDIC coverage has lost money due to a bank failure.

How interest rates affect where banks get money

When the Federal Reserve raises interest rates, banks have to pay more to borrow money and must offer higher rates to attract deposits. Customers move money to banks offering better rates, so banks compete for deposits by raising what they pay. At the same time, banks can charge higher rates on loans because borrowing costs more for customers too. Banks profit most when rates are stable — rapid changes force them to adjust quickly or lose money.

When rates are very low, banks struggle because the spread between what they pay depositors and what they charge borrowers shrinks. A bank paying 0.5% on savings and charging 3% on loans makes less profit than one paying 2% on savings and charging 7% on loans. During low-rate periods, banks often rely more heavily on fees to maintain profit.

The role of capital and shareholder investment

Banks also get money from shareholders who buy stock in the bank. When you buy bank stock, you own a small piece of the bank. The bank uses shareholder capital as a cushion — if loans go bad and the bank loses money, shareholder capital absorbs those losses before depositors are harmed. Regulators require banks to maintain a minimum amount of capital relative to the loans they make, called the capital ratio. This rule ensures banks cannot take on too much risk.

Banks return money to shareholders through dividends (regular payments from profits) and by buying back their own stock. A bank might announce it will buy back $1 billion of its own stock, which increases the value of remaining shares. Shareholders benefit when the bank is profitable, so they have an incentive to push management toward sound lending practices.

Frequently Asked Questions

Where does the Federal Reserve get money to lend to banks?

The Federal Reserve creates money electronically — it does not have a vault of cash. When the Federal Reserve lends to a bank, it credits the bank's account with newly created money. The Federal Reserve can do this because it is the central bank and has the authority to create currency. This is different from regular banks, which cannot create money.

Can a bank run out of money even if customers have deposits?

Yes. If too many customers withdraw money at once and the bank has lent out most of its deposits, it can run short of cash. Banks manage this by keeping reserves, borrowing from the Federal Reserve, and selling loans to other banks. A true bank run — where panic causes everyone to withdraw at once — can force a bank to fail even if it was solvent before the run started.

Why do banks pay such low interest on savings accounts?

Banks pay low rates on savings because they have many sources of funding — deposits are just one. Banks can borrow from the Federal Reserve, issue bonds, and attract deposits through fees and convenience rather than high rates. When interest rates in the economy are low, banks pay less on deposits. When rates rise, banks must pay more to compete for deposits.

What happens to my money if a bank is sold or merges with another bank?

Your deposits remain protected and accessible. If Bank A merges with Bank B, your account transfers to Bank B and your FDIC coverage continues. If Bank A is acquired by Bank B, the same thing happens. The FDIC tracks the merger and ensures no depositor loses coverage during the transition.

Do all banks get money the same way?

Large banks and small banks use the same basic sources — deposits, borrowing, and capital — but in different proportions. Large banks borrow more from other banks and issue more bonds because they have access to capital markets. Small community banks rely more heavily on local deposits and borrowing from the Federal Reserve. Credit unions, which are member-owned rather than shareholder-owned, operate differently and return profits to members as dividends.