Banks get their money from three main places: customer deposits, borrowing from other banks and the Federal Reserve, and investments they make with the money you give them

When you deposit money into a checking or savings account, that money does not sit in a vault with your name on it. Banks use customer deposits as their primary source of operating capital. They lend that money out as mortgages, car loans, and business loans, and they keep the difference between what they pay you in interest and what they charge borrowers. This is how banks make profit.

Beyond deposits, banks borrow money from each other through the federal funds market — a daily lending system between banks that need cash to cover withdrawals or meet regulatory requirements. They also borrow directly from the Federal Reserve, the central banking system that acts as a lender of last resort. The Fed sets the interest rate for these loans, which influences how much banks charge you for mortgages and credit cards.

Banks also raise money by selling bonds to investors, issuing stock to shareholders, and earning fees from services like wire transfers, overdraft charges, and investment advisory work. The largest banks generate billions in fee income annually, separate from interest they earn on loans.

Key Takeaways

  • Customer deposits are a bank's largest source of money, and banks lend that money out to earn interest income that exceeds what they pay depositors.
  • Banks borrow from each other and from the Federal Reserve when they need short-term cash to cover customer withdrawals or regulatory requirements.
  • Banks raise capital by selling bonds to investors and stock to shareholders, which gives them money to lend without relying only on deposits.
  • Banks earn significant revenue from fees — overdraft charges, wire transfer fees, and account maintenance fees — separate from interest on loans.
  • The Federal Reserve controls the interest rate banks pay to borrow, which directly affects the rates banks offer you on savings accounts and loans.

How customer deposits become bank revenue

When you deposit $1,000 into a savings account earning 0.5% annual interest, the bank pays you $5 per year. That same $1,000 might be loaned to a homebuyer at 7% interest, generating $70 per year in revenue for the bank. The bank keeps the $65 difference, minus the cost of running the branch, paying employees, and covering loan defaults.

Banks are required by law to keep a portion of deposits on hand — called reserve requirements — but the Federal Reserve lowered these requirements to zero in 2020, so most banks now hold only what they think they need for daily operations. The rest gets deployed into loans, investments, and other revenue-generating activities.

This system works as long as depositors do not all withdraw their money at once. During bank runs — rare but historically significant events — banks can fail if they cannot access enough cash quickly. The Federal Deposit Insurance Corporation (FDIC) insures deposits up to $250,000 per account holder per bank, which protects you but does not change where the bank's money comes from.

Borrowing from other banks and the Federal Reserve

Banks lend to each other constantly through the federal funds market. If Bank A has excess cash at the end of the day and Bank B needs to cover withdrawals, Bank A lends to Bank B overnight at an interest rate both agree on. This rate, called the federal funds rate, is set by the Federal Reserve and influences all other interest rates in the economy.

When banks cannot borrow from each other — usually during financial crises — they borrow directly from the Federal Reserve's discount window. The Fed charges a higher interest rate for these loans, which discourages overuse but ensures banks always have a source of emergency funding. During the 2008 financial crisis and the 2020 pandemic, the Fed lent hundreds of billions of dollars to banks through this mechanism.

Banks also access longer-term funding through the Federal Home Loan Banks (FHLBs), a network of 11 regional institutions that lend to member banks. These loans are typically used to fund mortgages and other long-term lending, and they are a major source of capital for smaller regional banks that cannot easily access bond markets.

Bonds, stock, and capital markets

Large banks raise money by issuing bonds — essentially borrowing from investors who receive interest payments over time. A bank might issue a $1 billion bond paying 5% interest, which brings in $1 billion in cash when ready. The bank then lends that money at higher rates, keeping the spread as profit. Bonds are sold to pension funds, insurance companies, and individual investors through financial markets.

Banks also raise capital by issuing stock, which gives shareholders partial ownership of the bank. When a bank goes public or issues new shares, it receives cash from investors. Unlike bonds, stock does not require the bank to pay interest, but shareholders expect the bank to grow in value and pay dividends over time.

These capital markets are crucial because they allow banks to grow without relying entirely on deposits. A bank with $10 billion in deposits might issue $5 billion in bonds and $2 billion in stock, giving it $17 billion in total capital to lend. This leverage is why banks are so profitable during good economic times and so vulnerable during downturns.

Fee income and investment returns

Banks generate substantial revenue from fees that have nothing to do with lending. Overdraft fees, wire transfer charges, monthly account maintenance fees, and ATM fees collectively bring in tens of billions of dollars annually across the banking industry. A single overdraft fee of $35 on a $5 transaction is pure profit for the bank once operating costs are covered.

Banks also earn money by investing deposits and capital in stocks, bonds, and other securities. A bank might buy Treasury bonds paying 5% interest or invest in mortgage-backed securities. These investments generate returns separate from the interest earned on loans. During periods of rising interest rates, banks benefit because the rates they charge on new loans increase faster than the rates they pay on deposits.

Investment banking divisions at large banks earn fees by underwriting stock offerings, advising on mergers and acquisitions, and managing investment portfolios for wealthy clients. These divisions operate somewhat separately from the retail banking side but contribute significantly to overall bank profitability.

The role of the Federal Reserve in bank funding

The Federal Reserve is not a commercial bank — it does not take deposits from you or make loans to individuals. Instead, it manages the money supply and sets monetary policy. When the Fed wants to increase the money supply, it buys government bonds from banks, paying them with newly created money. This puts cash into the banking system and lowers interest rates, encouraging banks to lend more.

Conversely, when the Fed wants to reduce the money supply and fight inflation, it sells bonds and raises interest rates. Banks then have less incentive to lend because borrowing from the Fed becomes more expensive. These policy decisions ripple through the entire economy and directly affect how much money banks have available and how much they charge you to borrow.

The Fed also sets the discount rate — the interest rate banks pay when borrowing directly from the Fed's discount window. This rate influences the federal funds rate, which in turn influences the prime rate that banks use to set rates on credit cards, home equity lines of credit, and adjustable-rate mortgages.

What happens when banks run out of money

Banks can face liquidity crises when deposits decline faster than expected or when loans default at higher rates than anticipated. During the 2023 banking crisis, several regional banks failed because depositors withdrew funds rapidly after interest rate increases made the banks' bond holdings worth less. The banks had the assets but not the cash to meet withdrawal demands.

When a bank fails, the FDIC takes over and either arranges a sale to another bank or pays out insured deposits directly. Uninsured deposits — amounts over $250,000 — may recover only a portion of their value, depending on how much the failed bank's assets sell for. This is why understanding where banks get their money matters: it shows you that banks are not vaults but businesses that can fail if they mismanage their funding sources.

Frequently Asked Questions

Do banks create money out of nothing?

Banks do not create money, but they do create credit. When a bank lends you $300,000 for a mortgage, it credits your account with $300,000 that did not exist before. You then spend that money into the economy. The bank's obligation to repay depositors is backed by your promise to repay the loan, not by physical money sitting in a vault. This is why bank lending expands the money supply during economic booms and contracts it during recessions.

What happens to my deposit if the bank fails?

The FDIC insures deposits up to $250,000 per account holder per bank. If your bank fails, the FDIC will pay you the full amount of your insured deposits, usually within a few business days. Amounts over $250,000 are not insured and may be lost entirely, though sometimes they recover partially when the bank's assets are sold. Keeping deposits under $250,000 at each bank protects you fully.

Why do banks pay such low interest on savings accounts?

Banks pay low interest on savings because they have abundant deposits and do not need to compete aggressively for more. When interest rates are low overall, banks can borrow cheaply and lend at higher rates, so they have little incentive to pay depositors more. When interest rates rise, banks must pay higher rates to keep deposits from moving to competitors, which is why savings account rates increased significantly in 2023 and 2024.

Can the Federal Reserve force banks to lend?

The Federal Reserve can make borrowing cheaper by lowering interest rates, but it cannot force banks to lend. During recessions, banks often hoard cash despite low rates because they fear loan defaults. The Fed can also require banks to maintain certain capital levels and stress-test them to may support they can survive downturns, but lending decisions remain with individual banks based on their risk assessment.

Where do banks get money during a financial crisis?

During crises, banks rely on the Federal Reserve's emergency lending facilities. The Fed can lend directly through the discount window, buy assets from banks to inject cash, or create new lending programs. During the 2008 crisis and the 2020 pandemic, the Fed lent trillions of dollars to banks and other financial institutions to prevent a complete collapse of the credit system.