Central Bank Money

What Is Central Bank Money?

Central bank money is any form of currency that constitutes a direct liability of a nation's central bank. When you hold a $20 bill, you hold a claim on the Federal Reserve itself. When a commercial bank holds reserves at the Fed, those balances are also central bank money. The defining characteristic is the issuer: the central bank, not a private institution.

The Bank for International Settlements (BIS) defines central bank money as "the monetary liabilities of the central bank." The European Central Bank describes it as "outside money" that "originates outside the private sector," making it entirely "information insensitive": its value does not depend on the creditworthiness of any private entity. This is what makes it the ultimate settlement asset in modern payment systems.

Understanding the distinction between central bank money and the money most people use daily (commercial bank deposits) is essential for grasping how payment rails work, why RTGS systems exist, and where digital currencies like CBDCs and stablecoins fit in the monetary landscape.

How It Works

Central bank money exists in two distinct forms, each serving a different role in the economy:

Physical Currency: Cash

Banknotes and coins are the only form of central bank money that ordinary people can hold directly. When you withdraw cash from an ATM, you are converting commercial bank money (your deposit balance) into central bank money (physical currency). The cash in your wallet is a bearer asset: whoever holds it owns it, no intermediary required.

Central banks hold a monopoly on currency issuance. In the United States, the Federal Reserve issues banknotes while the U.S. Mint produces coins. Physical currency is fiat money: it has value because the government declares it legal tender, not because of any intrinsic commodity backing.

Reserve Balances: Digital Central Bank Money

Reserve balances are electronic deposits that commercial banks and eligible financial institutions hold in accounts at the central bank. These are digital, but they are not accessible to the general public. Only licensed banks and certain financial entities can maintain reserve accounts.

Together, physical currency in circulation and reserve balances form the "monetary base" (also called M0 or base money). As of early 2026, the U.S. monetary base stood at approximately $5.5 trillion. This figure is elevated compared to pre-2008 levels due to quantitative easing, which expanded reserve balances at the Fed without proportional growth in broader money supply.

The Money Hierarchy

Modern monetary systems operate as a hierarchy. Central bank money sits at the top, serving as the foundation on which all other forms of money rest:

Central Bank Money (M0 / Monetary Base)
├── Physical Currency (banknotes + coins)
│   └── Accessible to: general public
│   └── Risk: none (sovereign guarantee)
│
└── Reserve Balances (digital)
    └── Accessible to: commercial banks only
    └── Risk: none (direct central bank liability)

Commercial Bank Money (M1-M2 deposits)
├── Checking / current account balances
├── Savings account balances
└── Created by: commercial bank lending
    └── Accessible to: general public
    └── Risk: issuing bank credit risk
    └── Protected by: deposit insurance (up to limits)

Commercial bank money maintains its value because it is convertible into central bank money at par (1:1). This convertibility guarantee, backed by deposit insurance and central bank regulation, is what allows a dollar in your bank account to function identically to a dollar bill for everyday transactions.

Central Bank Money vs. Commercial Bank Money

The money in your bank account is not central bank money. It is a liability of your commercial bank, created when that bank issues loans. The Bank of England established in its landmark 2014 paper that "the majority of money in the modern economy is created by commercial banks making loans." When a bank approves a mortgage, it does not lend out existing deposits: it creates a new deposit in the borrower's account, expanding the money supply.

In the United Kingdom, commercial bank deposits account for roughly 97% of money in circulation, with physical cash representing under 3%. In the United States, the ratio shifted after 2008 as quantitative easing dramatically expanded reserve balances, but commercial bank deposits still dominate the money that people and businesses actually use.

Why Central Bank Money Matters for Payments

The distinction between central bank money and commercial bank money has direct consequences for how payments settle and what risks participants bear.

Settlement in Central Bank Money: RTGS

Large-value interbank payments settle in central bank money through Real-Time Gross Settlement (RTGS) systems. Each payment transfers reserve balances between banks' accounts at the central bank, individually and in real time. Because the settlement asset is a central bank liability, there is no counterparty risk: the payment is final the moment it settles.

Major RTGS systems include Fedwire in the United States (processing roughly $4.5 trillion daily), TARGET2/T2 in the eurozone, and CHAPS in the United Kingdom (settling approximately £371 billion daily in 2025). These systems form the backbone of the global financial system.

Settlement in Commercial Bank Money: Card Payments

When you tap your card at a store, the payment does not settle in central bank money. Instead, it flows through a chain of commercial bank relationships: the merchant's acquiring bank, the card network, and your issuing bank. Final settlement between these banks happens later through a clearing and netting process, with only the net differences ultimately settling in central bank money.

This means everyday card payments carry counterparty risk during the settlement window. If a bank in the chain fails before settlement completes, payments could be disrupted. Deposit insurance and central bank oversight mitigate this risk, but they do not eliminate it entirely.

Why This Matters for Digital Payments

As economies become increasingly digital and cash usage declines, the general public is losing direct access to central bank money. The ECB has warned that "dwindling demand for central bank money could threaten the control of the monetary authority over inflation." This concern is one of the primary motivations behind CBDC development: preserving public access to risk-free central bank money in digital form.

CBDCs: Extending Central Bank Money to the Digital World

A Central Bank Digital Currency would create a third form of central bank money alongside cash and reserves. Two variants are under development globally:

• Retail CBDCs give the general public direct access to digital central bank money for everyday payments, functioning as "digital cash" without the credit risk of commercial bank deposits.
• Wholesale CBDCs provide a tokenized form of reserve balances for interbank settlement, potentially enabling programmability and more efficient cross-border payments.

As of mid-2026, 146 countries representing 98% of global GDP are exploring CBDCs. China's e-CNY has processed over 3.4 billion transactions worth approximately $2.3 trillion. The European Central Bank is preparing a digital euro pilot for 2027 with potential issuance targeted during 2029. The United States, by contrast, issued Executive Order 14178 in January 2025 prohibiting federal CBDC development, favoring regulated private stablecoins instead.

For a detailed comparison of these approaches, see our research on CBDCs vs. stablecoins.

Stablecoins: A Private-Sector Alternative

Stablecoins offer a private-sector approach to digital dollars. Unlike central bank money, a stablecoin is a liability of a private issuer (such as Circle or Tether) backed by reserve assets intended to maintain a 1:1 peg with a fiat currency. The total stablecoin market reached approximately $315 billion by mid-2026.

The U.S. GENIUS Act, signed into law in July 2025, created a federal regulatory framework requiring stablecoin issuers to maintain 100% reserve backing with liquid assets and publish monthly reserve disclosures. This positions regulated stablecoins as a bridge between the accessibility of digital money and the trust framework of the traditional banking system.

Platforms like Spark enable stablecoin payments on Bitcoin infrastructure, combining the programmability and instant settlement of digital assets with Bitcoin's security model. For businesses evaluating payment rails, stablecoins offer many of the accessibility benefits that CBDCs promise while operating on existing blockchain networks.

Risks and Considerations

Declining Cash Usage

As physical cash usage falls, the public's direct connection to central bank money weakens. In an economy where all transactions flow through commercial bank deposits, the singleness of money (the guarantee that all forms trade at par) depends entirely on regulatory frameworks and deposit insurance rather than direct convertibility to central bank money.

Commercial Bank Money Risks

Commercial bank deposits carry the credit risk of the issuing bank. Deposit insurance (such as FDIC coverage up to $250,000 in the United States) mitigates this risk for individual depositors, but it does not eliminate systemic risk. Bank failures, as seen in 2023, can temporarily disrupt access to deposits and shake confidence in the convertibility guarantee.

CBDC Design Tradeoffs

Extending digital central bank money to the public raises questions about privacy, surveillance, and the role of commercial banks. A retail CBDC could disintermediate commercial banks if depositors move funds into central bank accounts during times of stress. Central banks designing CBDCs must balance financial inclusion with stability and privacy concerns.

Stablecoin Counterparty Risk

Unlike central bank money, stablecoins require trust in a private issuer. If a stablecoin's reserves are mismanaged, insufficient, or illiquid, the peg can break. Regulation like the GENIUS Act and MiCA aims to reduce this risk through mandatory reserve requirements and transparency standards, but the fundamental distinction remains: stablecoins are private liabilities, not sovereign ones.

This glossary entry is for informational purposes only and does not constitute financial or investment advice. Always do your own research before using any protocol or technology.