Inside the Digital Euro: Holding Limits, Privacy and the Fight With Banks

If the European Union goes ahead with a digital euro, it will be the most significant change to the form of money in the eurozone since banknotes and coins were introduced in 2002. It would also be the first retail CBDC in a major advanced economy. The European Central Bank has been in a preparation phase since late 2023, finalizing a rulebook, selecting providers and testing technology, while EU lawmakers debate the legal framework proposed by the European Commission in June 2023. The design that has emerged is a study in compromise. Understanding it helps explain why public digital money is so difficult to get right.

The basic architecture

A digital euro would be a direct liability of the central bank, like cash, but held in digital wallets. People would not open accounts at the ECB. Instead, banks and licensed payment providers would distribute it, handle customer onboarding and provide the apps. It would be usable for payments in shops, online and between individuals across the euro area, and it would be legal tender, meaning merchants that accept digital payments would generally be required to accept it. Basic use would be free for individuals.

This intermediated model is deliberate. The ECB does not want to run customer relationships for hundreds of millions of people, and it wants to keep banks at the center of the payment system. But it creates a question of incentives: why would banks promote a product that could compete with their own deposits and payment services?

Holding limits: protecting the banks

The most debated design element is a cap on how much digital euro an individual can hold. The concern is bank disintermediation. If people moved large amounts from deposits into digital euros, especially during periods of stress, banks would lose a stable source of funding and might have to cut lending. A cap limits that risk. ECB analysis has discussed a limit in the region of a few thousand euros per person, with around three thousand euros cited as an illustrative level, though the final figure would be set closer to issuance.

To make a cap usable, the design includes a 'waterfall' mechanism: if an incoming payment would push a wallet above the limit, the excess would automatically flow into a linked bank account. Conversely, a 'reverse waterfall' could pull funds from the linked account to complete a payment. The aim is to make the limit invisible in everyday use while keeping large balances in the banking system.

A holding limit is a confession: public digital money is attractive enough that it has to be rationed.

Privacy: the political battleground

Privacy is the issue most likely to decide public acceptance. The ECB has said it would not see individual users' identities or transaction details for online payments, which would remain with intermediaries under existing data protection and anti-money-laundering rules. For offline payments, made device to device without an internet connection, the proposal allows a level of privacy close to cash for small amounts, since transactions would be known only to payer and payee.

Critics are not fully reassured. Some argue that any digital system can be expanded later to allow more surveillance, and that legal protections can change. Others point out that anti-money-laundering rules already require substantial data collection by banks. In the European Parliament, privacy has been one of the dividing lines in debates over the legislation.

The compensation question

Someone has to pay for running the system. The proposed legislation would cap the fees that intermediaries can charge merchants, with reference to what comparable payment methods cost, to avoid a digital euro becoming expensive to accept. Banks argue that the combination of free use for consumers, capped merchant fees and the investment needed to integrate a new instrument makes the business case weak. The ECB counters that a pan-European standard could reduce banks' dependence on international card schemes and lower their costs over time.

The timeline and the politics

The ECB's preparation phase is scheduled to run until autumn 2025. The central bank has said that a decision on issuance can only follow adoption of the legal framework by the EU's co-legislators, a process that has been slow. The US decision in January to rule out a digital dollar has given European advocates a new argument, framing the digital euro as a defense against dependence on foreign payment infrastructure and dollar stablecoins. Skeptics respond that Europe could achieve similar goals by strengthening instant payments and private pan-European schemes.

• Adoption of the legislation by the Parliament and member states.
• The ECB's decision at the end of the preparation phase.
• Final calibration of holding limits and fees.
• Public trust, measured through surveys and political debate.

What the design tells us

The digital euro design is an attempt to square a circle: to offer something as safe and private as cash, as convenient as a card, and as open as the internet, without destabilizing banks or creating a surveillance tool. Each compromise, from holding limits to intermediated distribution, weakens one goal to protect another. Whether the result is compelling enough to attract users is the question no pilot can fully answer in advance. This is analysis of monetary policy design, not investment advice.