How Central Bank Digital Currencies (CBDCs) Work

The Basic Architecture

A central bank digital currency, or CBDC, is a liability of the central bank—the same institution that issues physical banknotes. This distinguishes it from the money that most people use day-to-day, which is a liability of a commercial bank. When you hold funds in a current account at a retail bank, you hold a claim on that bank, not on the central bank directly. A CBDC would represent a direct digital claim on the central bank itself, in the same way a £20 note represents a direct claim on the Bank of England.

The most common design framework divides CBDCs into two broad categories.

Retail CBDCs are intended for use by households and businesses in everyday transactions—essentially a digital equivalent of cash. They could be held in digital wallets provided by the central bank, by regulated financial institutions, or by technology intermediaries operating under licence.

Wholesale CBDCs are designed for use in interbank settlements and large-value financial transactions. Several countries, including France and Singapore, have already run wholesale CBDC pilots for settling securities transactions between financial institutions.

How Settlement and Distribution Work

In most proposed retail CBDC designs, the central bank does not hold individual accounts for every citizen. Instead, it issues the digital currency and relies on a two-tier distribution model: commercial banks and regulated payment providers act as intermediaries, maintaining customer relationships, verifying identities, and providing wallets or access interfaces. The central bank operates the core ledger but remains one step removed from the retail customer.

The underlying technology varies by country. Some central banks are exploring distributed ledger technology with permissioned access—meaning only approved participants can validate transactions. Others are building on more conventional centralised database architectures that prioritise speed and scalability over the decentralisation associated with cryptocurrencies.

A key design parameter is programmability. Some CBDC proposals include the ability to attach conditions to digital money—for example, government transfers that can only be spent on specific categories of goods, or funds with an expiry date intended to stimulate spending. Programmability raises significant questions about financial autonomy that central banks and legislators are actively debating.

CBDCs Versus Commercial Bank Deposits and Cryptocurrencies

CBDCs are frequently compared with two existing forms of digital value: commercial bank deposits and decentralised cryptocurrencies. The distinctions are important.

Commercial bank deposits are insured up to statutory limits in most jurisdictions (£85,000 in the United Kingdom under the Financial Services Compensation Scheme, for example) but remain a credit exposure to the bank. In a financial crisis, a depositor faces some risk, however small. CBDC holdings, as a direct central bank liability, would carry no such credit risk.

Decentralised cryptocurrencies such as Bitcoin have no issuer and no government backing. Their value is determined entirely by supply and demand in open markets. A CBDC, by contrast, is denominated in the national currency and maintains a one-for-one par value with physical cash. It is not designed to appreciate or depreciate independently of the currency it represents.

Stablecoins—privately issued tokens pegged to a national currency—occupy a middle ground, but they carry issuer risk and operate outside the central bank’s balance sheet. Regulators in multiple jurisdictions are writing rules that would require stablecoin issuers to hold high-quality liquid assets as reserves, partly to distinguish them more clearly from CBDCs.

Policy Implications and Open Questions

The introduction of a retail CBDC would have significant macroeconomic implications, several of which remain unresolved in policy discussions.

• Bank disintermediation risk. If households shift deposits from commercial banks to CBDCs, banks could face funding pressure, potentially tightening credit availability in the economy. Most central bank designs include holding limits or non-interest-bearing structures to limit this effect.
• Monetary policy transmission. A CBDC could allow central banks to implement interest rate changes more directly on a large share of the money supply, potentially making monetary policy more precise.
• Financial inclusion. Proponents argue that CBDCs could extend access to formal financial services to populations without bank accounts, provided the wallet infrastructure is accessible.
• Privacy. Any CBDC system capable of preventing financial crime requires some transaction monitoring, which creates a tension with the anonymity that physical cash currently provides.

As of mid-2026, the Bahamas, Jamaica, and Nigeria have launched retail CBDCs, while the European Central Bank’s digital euro project and the United States Federal Reserve’s research programme remain in development and consultation phases. The pace of adoption will depend as much on public trust and legislative frameworks as on the underlying technology.