Bank Money

Bank money, also called commercial-bank money or deposit money, is the balance customers hold in deposit accounts and use for payments. It is a liability of the commercial bank to the customer, backed by the bank’s assets and supported by payment systems, regulation, liquidity, capital, and applicable deposit protection.

Key Takeaways

• A bank deposit is money to the customer but a liability on the bank’s balance sheet.
• Commercial banks create new bank money when they make loans or purchase assets from nonbanks and credit deposit accounts.
• Loan principal repayment can destroy bank money by reducing both a deposit and a loan.
• Interbank payments transfer reserve balances between banks while transferring deposits between customers.
• Bank money differs from central-bank money, which includes banknotes and reserve balances.
• Deposit insurance, supervision, and convertibility at par support confidence but do not eliminate bank risk.

Bank Money on a Balance Sheet

Suppose a customer has 5,000 in a checking account:

The customer’s account balance can function as a medium of exchange because the customer can transfer it, use a payment card, issue an authorized payment, or convert it into cash under the account terms.

The deposit is not a bag of banknotes stored under the customer’s name. It is a contractual claim recorded on the bank’s ledger.

Worked Example: How a Bank Loan Creates Money

Assume a bank grants a 100,000 loan and credits the borrower’s transaction account.

The bank creates a loan asset and a matching deposit liability. The borrower has new purchasing power and an equal debt obligation. New money is created, but new net wealth is not: the borrower’s deposit asset is matched by the loan liability.

The Bank of England’s money-creation explainer and the ECB’s What is money? both distinguish commercial-bank deposits from central-bank money and explain deposit creation through bank lending.

How Other Bank Transactions Create Deposits

A bank can also create deposit money when it buys an asset from a nonbank customer.

For example, if a bank buys a security for 20,000 and credits the seller’s deposit account:

If the buyer is the central bank rather than a commercial bank, the balance-sheet path differs. The central bank can create reserve balances, and a customer’s bank can create a matching deposit when settlement reaches the customer.

How Bank Money Is Destroyed

When a borrower repays 10,000 of loan principal from a deposit account at the same bank:

Both the deposit and loan shrink. The principal repayment destroys bank money.

Interest payment is different. It reduces the customer’s deposit but contributes to the bank’s income and equity after expenses and taxes; subsequent bank spending, dividends, wages, or purchases can transfer deposits back to the nonbank sector.

Loan write-offs also differ from repayment. A write-off reduces the loan asset and bank equity or allowances; it does not automatically remove a borrower’s deposit that was already spent.

What Happens in an Interbank Payment?

Assume a Bank A customer pays 25,000 to a Bank B customer.

The deposit moves from one customer’s bank to another, and Bank Reserves settle the interbank obligation.

Aggregate deposit money is unchanged by this simple payment. Its distribution across banks changes, which can create funding or liquidity pressure for the bank losing deposits.

Bank Money vs. Central-Bank Money

Customers normally expect deposits and official currency to exchange at par. Maintaining that one-to-one relationship is central to monetary and financial stability.

Bank Money and the Money Supply

Most broad Money Supply measures include selected deposit liabilities of monetary institutions.

Which deposits count depends on:

• account accessibility
• maturity or notice period
• holder sector
• issuer sector
• geography
• statistical consolidation
• the official aggregate definition

Not every bank liability is money. Long-term bonds, subordinated debt, equity, and many wholesale instruments are funding but usually fall outside narrow monetary aggregates.

What Constrains Bank-Money Creation?

Capital

New lending expands assets and risk exposure. The bank needs adequate loss-absorbing capital and leverage capacity.

Liquidity and Settlement

New deposits can leave through payments. The bank needs reserves, liquid assets, collateral, and reliable funding.

Funding Cost

Banks compete to retain deposits and obtain wholesale funding. Higher funding costs can make lending less profitable.

Credit Risk

Borrower quality, collateral, concentration, expected loss, and underwriting standards limit acceptable credit.

Demand and Profitability

Banks need borrowers willing and able to borrow at rates that cover costs and risk.

Monetary Policy

Policy rates and financial conditions affect loan pricing, deposit behavior, asset values, and credit demand.

The ability to create a deposit entry does not allow a bank to ignore these constraints.

Why Bank Money Is Accepted

Confidence rests on several layers:

• enforceable account and payment rights
• bank assets and capital
• liquidity management
• central-bank settlement systems
• prudential supervision
• deposit insurance or guarantee schemes where applicable
• recovery and resolution frameworks
• expectation of conversion into currency at par

Coverage limits, exclusions, payout timing, and legal rights vary. Deposit protection should never be described as unlimited unless the governing scheme explicitly says so.

Bank Money and Nonbank Lending

If a nonbank lender advances 100,000 to a borrower, the lender’s bank deposit generally falls while the borrower’s deposit rises:

The transaction creates credit but ordinarily transfers existing bank money. A deposit-taking bank loan can create both new credit and new deposits.

How to Analyze Bank-Money Data

1. Identify the deposit or liability category.
2. Confirm the issuing institutions.
3. Confirm the money-holding sector.
4. Check whether interbank and government deposits are excluded.
5. Distinguish outstanding stock from transaction flows.
6. Review seasonal adjustment and reporting frequency.
7. Check for reclassifications and breaks in series.
8. Compare deposit growth with bank credit, securities purchases, and repayment.
9. Separate nominal growth from inflation-adjusted purchasing power.

Risks and Limitations

• Issuer risk: Deposits are claims on commercial banks, not direct claims on the central bank.
• Run risk: Customers can transfer deposits faster than many bank assets can be sold.
• Coverage risk: Deposit protection can have limits, eligibility rules, and delays.
• Inflation risk: A stable nominal balance can lose purchasing power.
• Definition risk: Statistical aggregates include different deposit categories.
• Concentration risk: Large or uninsured depositors can create rapid funding outflows.
• Operational risk: Payment outages, fraud, cyber incidents, and access controls can affect usability.
• Cross-border risk: Currency, legal entity, branch, and jurisdiction affect the claim.

Common Mistakes

• Treating a deposit as physical cash stored for the customer.
• Saying banks first collect a deposit and then lend a fixed portion of it.
• Confusing bank money with bank reserves.
• Assuming loan creation produces net wealth for the borrower.
• Treating all bank liabilities as money.
• Assuming deposit insurance covers every account and amount.
• Saying a nonbank loan necessarily creates new aggregate deposits.
• Ignoring the destruction of deposits when loan principal is repaid.

Related Terms

• Credit Creation: Creation of credit through bank and nonbank balance sheets.
• Money Supply: Official stocks of selected monetary instruments.
• Monetary Base: Currency in circulation plus central-bank reserve balances.
• Demand Deposit: A deposit generally payable on demand under its terms.
• Deposit Insurance: Protection for eligible deposits within a governing scheme.

FAQs

This article is educational and does not provide banking, legal, regulatory, or investment advice. Account rights and deposit protection vary by institution and jurisdiction.