Digital Money / Learning brief
Central versus commercial bank money
Your notes
In simple terms / 01
What this means in plain language
Explains the two forms of money that circulate in a modern economy, central bank money and commercial bank money, and why the distinction over which one finally settles a payment drives almost every later digital-money question.
Modern economies run money in two tiers. Central bank money is a direct claim on the central bank: physical banknotes held by the public, and electronic reserve balances that commercial banks hold in accounts at the central bank. Because the issuer is the central bank, this money carries no credit risk from any commercial bank failing. Commercial bank money is a claim on a commercial bank, the balance in a customer's deposit account, and it is the money most people and businesses use every day. Its value at par rests on the issuing bank staying sound, on supervision, and on deposit protection, so it carries that bank's credit risk in a way central bank money does not. The two tiers connect at settlement: customers experience commercial bank money, but when banks square up with one another they move central bank money between their reserve accounts. That is why central bank money is called the settlement asset. The principle that ties it together is singleness of money, the idea that every form of the currency trades one-for-one at par, so a euro is simply a euro whoever issued it.
Key takeaways / 03
Three things to remember
- 01
Central bank money is a claim on the central bank; commercial bank money is a claim on a commercial bank.
- 02
The system is two-tier: the public holds commercial bank money, and banks settle with one another in central bank money.
- 03
Central bank money is the settlement asset because it carries essentially no commercial-bank credit risk, and singleness of money keeps every form trading at par.
Practical use cases / 04
Where you would use this
A payments analyst explains why an interbank transfer still needs a settlement leg even though both customers only ever see their own bank balances.
A treasury team distinguishes the credit risk it takes on commercial bank deposits from the risk-free nature of central bank reserves.
A product team assessing a new digital-money idea asks first which form of money settles it and whether par is preserved.
Worked example / 05
Put the idea into a real situation
Illustrative example (SYNTHETIC / TRAINING ONLY): Maya holds EUR 500 at Bank Alfa and pays Priya, who banks with Northstar Bank. To the two customers the money is commercial bank money, a claim on their own banks. Behind the scenes, Bank Alfa and Northstar Bank settle the EUR 500 by moving central bank money between their reserve accounts at the Central Bank. Priya ends up with EUR 500 of Northstar Bank's commercial bank money, backed by an interbank settlement in central bank money. Because singleness of money holds, neither Maya nor Priya has to ask whose euro they are being paid in. Arrangements vary by jurisdiction and this construction was not verified against a primary central-bank source this pass.
Evidence & review / 07
Evidence & review
General to two-tier monetary systems; describes the concepts of central and commercial bank money rather than any one jurisdiction's arrangements.
What this brief simplifies: SYNTHETIC / illustrative. Names, balances, and institutions are invented for teaching. The two-tier picture omits reserves policy, deposit insurance limits, and cash-in-circulation detail. Arrangements vary by jurisdiction and were not verified against a primary central-bank source this pass.
Sources for this brief3
- Market practiceMarch 2003 edition
A glossary of terms used in payments and settlement systems ↗ — CPSS (now CPMI), Bank for International Settlements · Central bank money, commercial bank money, settlement asset
Terminology has evolved since this edition; newer CPMI publications refine some definitions.
- Official requirement
Principles for financial market infrastructures ↗ — CPMI and IOSCO (Bank for International Settlements) · Settlement asset and settlement finality principles
Published by the CPSS (now CPMI) and IOSCO; contains 24 principles plus responsibilities for authorities. This site uses it only for high-level concepts such as settlement finality.
- Simplified educational illustration
Payments Signal editorial teaching models — Payments Signal · Two-tier money construction; all parties synthetic
Used wherever diagrams, scenarios, figures, or example values are didactic constructions rather than sourced facts; every such use carries a simplifications disclosure. All people, companies, banks, and list entries in examples are fictional.