When a commercial bank makes a loan, it can create new money in the form of a bank deposit. This may sound surprising because banks are often described as institutions that take money from savers and lend it to borrowers. That description captures part of what banks do, but it misses an important feature of modern banking: a bank does not usually need to transfer an existing deposit of the same amount from another customer's account before it can grant a new loan. Instead, the loan itself can create a new deposit.
Suppose a bank approves a $20,000 loan to a customer. At the moment the loan is made, the bank records two entries on its balance sheet. On the asset side, it records the $20,000 loan, because the borrower now owes that amount to the bank. On the liability side, it credits the borrower's deposit account with $20,000, because the bank now owes that amount to the customer on demand according to the terms of the account. The bank's assets and liabilities therefore rise by the same amount. No pile of cash needs to be moved from one customer to another for this accounting process to occur.
From the borrower's point of view, the result is straightforward. Before the loan, the customer did not have the additional $20,000 available to spend. After the loan is approved and credited, the account contains $20,000 more. That deposit can be used to pay bills, make purchases, or transfer funds. Because bank deposits are widely accepted as a means of payment, the newly created balance functions as money.
This is why it is misleading to imagine that every bank loan must come from money previously deposited by someone else. If another customer has $20,000 in a savings account, the bank does not need to reduce that person's balance by $20,000 in order to create the new loan. The original depositor still sees the same balance, while the borrower now has a new deposit. In this sense, the banking system can expand the quantity of deposit money through lending.
That does not mean banks can lend without limits. Once the borrower spends the money, the bank may face additional obligations. Imagine that the borrower uses the entire $20,000 to buy a car from someone who uses another bank. The borrower's deposit at the first bank falls when the payment is made, while the seller's deposit at the second bank rises. Behind the scenes, the two banks must settle the payment between themselves, typically using central bank reserves or other settlement arrangements. The bank that made the loan must therefore have access to enough liquidity to handle payments leaving the bank.
This distinction is important because creating a deposit and settling payments are separate parts of the banking process. A bank can create a deposit when it makes a loan, but it must still manage the consequences if that deposit is transferred elsewhere. Banks obtain reserves and funding through several channels, including incoming deposits, borrowing from other financial institutions, issuing debt, and, under certain conditions, borrowing from the central bank. The need to manage liquidity is one of the practical constraints on lending.
Banks are also constrained by capital requirements and credit risk. A loan is an asset, but it is not a risk-free asset. If borrowers fail to repay, the bank can suffer losses. Banks therefore need enough capital to absorb possible losses and must assess whether borrowers are likely to meet their obligations. Regulation, internal risk controls, interest rates, economic conditions, and the demand for credit all influence how much lending banks are willing and able to provide. The ability to create deposits does not give banks an unlimited ability to create profitable or sustainable loans.
The process becomes even clearer when the borrower starts repaying the debt. Suppose the customer later repays $1,000 of the loan principal using money in a bank account. The borrower's deposit balance decreases by $1,000, and the bank reduces the outstanding value of the loan by the same amount. The deposit money used to repay the principal is no longer circulating as a bank deposit. In that sense, the money that was created when the loan was issued is destroyed when the principal is repaid.
Interest payments work differently. When a borrower pays interest, the payment becomes income for the bank rather than simply cancelling part of the loan asset and an equal amount of deposit money. The bank may then use that income to pay wages, expenses, taxes, dividends, or other costs, allowing much of it to return to circulation. This is why it is important to distinguish between repayment of principal and payment of interest when explaining how bank money is created and extinguished.
The same basic mechanism applies to many common forms of bank lending, including mortgages, business loans, and some forms of consumer credit. When a mortgage is granted, for example, a bank may create a deposit that is then transferred to the seller of a home. The new deposit may quickly leave the lending bank, but the loan remains on its balance sheet as an asset until it is repaid, sold, written off, or otherwise removed. The banking system as a whole has created deposit money even though the location of that money may change from one institution to another.
Looking at banking through balance sheets removes much of the mystery. A loan creates both an asset for the bank and a liability to the borrower in the form of a deposit. Spending moves deposits through the banking system, while settlement requires banks to manage reserves and funding. Repaying loan principal reverses the original creation process and reduces the amount of deposit money. Modern bank money is therefore not simply passed from one person to another in a fixed quantity. It can be created through credit, transferred through payments, and extinguished through debt repayment.
