How Commercial Banks Create Money: A Balance-Sheet Explanation

Direct answer. When a commercial bank makes a loan by crediting the borrower's account, it normally records two entries at once: a loan asset and an equal deposit liability. That deposit is newly created commercial-bank money. If it is paid to another bank, settlement balances move between banks. Capital, liquidity, funding, risk, profitability, regulation, policy, and creditworthy demand constrain the process. S004S005S006

“Banks create money” is an accounting description, not a claim that banks create free resources or can lend without limit. A borrower receives spendable purchasing power and an obligation to repay. The bank receives an asset that may default, while issuing a deposit it must honor at par through the payment system.

Follow three separate events: the loan is funded, the deposit is spent, and principal is repaid. Approval of an undrawn loan is not the same event as crediting a deposit. The worked example below isolates the accounting movements; its units are illustrative, not a quote, a credit offer or a prediction about a real bank.

1. Before 2. Originate 3. Same bank 4. Settle 5. Repay

Before the loan

Assets

Reserves 20

Loans 80

Total 100

Liabilities + equity

Deposits 90

Equity 10

Total 100

Bank A begins with a balanced, simplified statement.

The bank originates 10

Assets

Reserves 20

Loans 90 +10

Total 110

Liabilities + equity

Deposits 100 +10

Equity 10

Total 110

The loan asset and borrower deposit appear together. Deposit money rises by 10.

The borrower pays another Bank A customer

Assets

Reserves 20

Loans 90

Total 110

Bank A deposits

Borrower −10

Recipient +10

Total 100

Ownership changes inside Bank A; its total deposits, reserves, and total balance sheet do not.

The borrower pays a Bank B customer

Bank A

Deposits −10

Reserves −10

→ reserve settlement →

Bank B

Deposits +10

Reserves +10

System deposits still include the new 10, but Bank A now has a funding and liquidity consequence.

Principal is repaid

Assets

Loan principal −10

Liabilities

Payer deposit −10

Principal repayment contracts both sides and destroys 10 of deposit money. Interest and default follow different accounting paths.

The numbers isolate the mechanism; they are not a regulatory capital or liquidity example.

First, read the bank as a balance sheet#

A balance sheet has two sides. Assets are what the bank owns or is owed: loans, securities, cash, and reserve or settlement balances. Liabilities are what the bank owes: customer deposits, wholesale borrowing, and other debts. Equity absorbs losses and equals assets minus liabilities.

A deposit is the bank's liability to its customer, not a labeled packet of notes held in a vault. It can be used for payment because the bank promises conversion and transfer at par within a legal, supervised settlement system. Central-bank currency and reserves are different liabilities, issued by the central bank. S003S007S008

Step 1: loan origination creates a deposit#

Suppose Bank A makes a loan of 10 units by crediting the borrower's deposit account. It records:

The entries balance. Bank A did not subtract 10 from a named saver and hand that saver’s deposit to the borrower. Its balance sheet expanded by 10 on both sides. The borrower can spend the deposit, so the banking system's deposit money has increased by 10 at that moment. This operational description is set out by the Bank of England and Deutsche Bundesbank. S004S005S006

That does not mean savings and funding are irrelevant. Deposits and market funding affect cost, liquidity, stability, and the ability of an individual bank to withstand outflows. It means the accounting entry for a new loan is not mechanically preceded by transferring another customer's existing balance.

Step 2: a same-bank payment changes owners, not total deposits#

If the borrower pays a supplier who also banks at Bank A, the bank debits the borrower and credits the supplier. Total deposits at Bank A are unchanged by the payment itself; the owner of the deposit changes.

The loan remains an asset of Bank A. The supplier now holds the deposit liability. This is the simplest path because Bank A can update its own ledger without transferring settlement money to another institution.

Step 3: a cross-bank payment requires settlement#

Now suppose the supplier uses Bank B. Bank A debits the borrower's account, Bank B credits the supplier, and the banks settle the interbank obligation—commonly by transferring reserve or settlement balances at the central bank.

Across the two-bank system, the deposit created by the loan still exists; it has moved to Bank B. But Bank A has lost reserves. It may offset that outflow with incoming payments, attract deposits, borrow in money markets, sell or pledge assets, or use a central-bank facility if it is eligible and has acceptable collateral. The loan-creation decision and the later reserve/funding consequence are related but distinct steps. S004S005S006

The settlement leg depends on the different money and balance-sheet roles of commercial and central banks.

This is why two slogans are both misleading:

• “Banks can lend without funding” ignores what happens after customers move the new deposits elsewhere.
• “A bank must collect the exact deposit before it lends” mistakes later liquidity and funding management for the origination entry.

What reserves do—and do not do#

Reserve balances are central-bank liabilities held by eligible institutions. They are used for interbank settlement, meet policy or regulatory arrangements where applicable, and provide liquidity buffers. Ordinary households do not use reserve accounts to buy groceries, and a commercial bank does not normally lend reserve balances to a household.

The central bank manages the supply and price of reserves within its operating framework so that payments settle and its policy rate or monetary conditions are implemented. Specific reserve requirements, standing facilities, collateral rules, and remuneration arrangements vary across jurisdictions and over time. That is why any named ratio or current rule needs a dated official source.

Reserves matter greatly. The error is treating them as a fixed pile that mechanically determines every loan in every modern system.

Why the fixed money-multiplier story is incomplete#

A familiar textbook sequence begins with a new reserve deposit, assumes a required reserve ratio, and has banks lend a fraction through repeated rounds. This can demonstrate how constraints operate in a stylized system. It is not a universal chronology of real loan decisions.

Official central-bank explanations emphasize that banks typically decide whether to lend based on borrower demand, expected return, risk, capital, liquidity, and funding conditions. The resulting payments create a demand for settlement balances. Central banks accommodate settlement needs in ways consistent with monetary policy and their collateral rules; they do not promise unlimited reserves at zero cost to any bank. S004S005S006

The better causal sequence is:

1. A bank assesses a borrower and the loan's return and risk.
2. Funding the loan by crediting the borrower's account creates a loan asset and deposit liability.
3. Spending may create an interbank settlement outflow.
4. The bank manages liquidity and funding and remains subject to capital, supervision, and central-bank terms.
5. The borrower repays, refinances, or defaults; each path changes the balance sheet differently.

What actually limits money creation?#

No single constraint is always binding. They interact.

Capital and losses#

Equity and qualifying capital instruments absorb losses. New lending increases assets and can increase risk-weighted exposures, so a bank must have enough loss-absorbing capacity for its portfolio under applicable rules and its own risk appetite. Capital is not a cash reserve set aside loan by loan; it is a funding and loss-absorption layer. Current definitions and minimums are jurisdiction-specific. S079S080S107S150

Liquidity and funding#

A bank must meet withdrawals and payments when due. A profitable thirty-year loan cannot necessarily be converted into settlement money immediately at face value. Stable deposits, market borrowing, liquid assets, collateral, and access to facilities influence how costly it is to fund expansion and survive stress.

That funding consequence is the bridge to how deposit outflows become a bank run.

Credit and interest-rate risk#

Borrowers can default. Asset values and cash flows can change when rates move. A bank that creates more deposits while making weak loans has not created wealth; it has expanded claims against assets that may be worth less than recorded.

Profitability and competition#

The expected interest and fee income must exceed funding, operating, expected-loss, capital, and compliance costs. Competition and borrower bargaining power affect those margins.

Borrower demand and debt service#

Banks need customers willing and able to borrow on acceptable terms. High rates, poor economic prospects, excessive existing debt, or weak projects can suppress credit even when banks are liquid.

Regulation, supervision, and policy#

Licensing, concentration rules, underwriting standards, capital and liquidity frameworks, stress tests, collateral terms, and monetary policy all shape the feasible set. They do not reduce to one lever.

Repayment destroys deposit money; default does not simply reverse the loan#

When principal is repaid from a deposit at the lending bank, the bank reduces its loan asset and the payer's deposit liability. Both sides contract by the principal amount. In that accounting sense, repayment destroys commercial-bank money.

Interest follows a different path. It is income to the bank before expenses, taxes, provisions, and distributions. It can later return to deposit accounts through wages, purchases, dividends, or other spending.

Default is also different from repayment. The bank writes down or provisions against the loan asset, reducing profit and potentially equity. The deposit created earlier may already be held by someone else. A bad loan can therefore leave deposits in circulation while weakening the bank that created them.

Individual bank versus the whole system#

An individual bank cannot assume that the deposit it creates will remain on its own balance sheet. Customers can transfer it immediately. That makes liquidity, funding, pricing, and payment flows decisive at the bank level.

The banking system as a whole does not lose a deposit merely because it moves from Bank A to Bank B. System-wide deposits contract when borrowers repay principal, banks sell assets to non-banks without replacing the associated money, or customers convert deposits into central-bank currency—subject to the accompanying balance-sheet operations. A loss on a loan does not by itself cancel the deposit created earlier; default and principal repayment have different accounting effects.

Confusing the individual bank with the whole system is a common source of arguments that appear contradictory but are answering different questions.

Commercial-bank money versus central-bank money#

The one-to-one exchange of most bank deposits into currency or another bank's deposits is an institutional achievement. Payment systems, central-bank settlement, liquidity facilities, prudential rules, deposit insurance, resolution law, and public confidence help maintain that par relationship. S003S004S005S006S007S008

Five misconceptions, corrected#

1. “Banks lend the reserves in customer accounts.” Customer deposits and central-bank reserves are different liabilities held by different parties.
2. “Creating money creates equal wealth.” The new deposit is paired with a debt and a risky loan asset.
3. “Reserves never matter.” They are critical for settlement and liquidity, even when they do not mechanically precede the loan.
4. “Banks can create unlimited money.” Capital, liquidity, funding, risk, policy, supervision, profitability, and demand constrain them.
5. “Loan repayment is just income to the bank.” Principal repayment contracts the loan and deposit; interest is the income component.

The useful mental model#

Think in three layers: origination, settlement, and constraint. Origination explains how the loan and deposit appear together. Settlement explains what happens when the deposit is spent across banks. Constraints explain why an accounting ability is not an unlimited economic power.

That model is more accurate than either “banks merely lend out savings” or “banks create money from nothing without consequence.”

The mechanism sits inside the longer evolution of deposit banking and settlement, not outside it.