What If Your Money Had an Expiry Date?

You may have seen a post that starts with a question: what if your money came with an expiry date? Spend it by Friday, or it disappears. Spend it only at approved shops, or it will not work.

It sounds like science fiction, but it touches something real. Central banks around the world are studying a new form of money, and some of it can, technically, carry rules like these. This lesson separates what is real from what is exaggerated.

01. What a CBDC actually is

A central bank digital currency, or CBDC, is digital money issued directly by a country's central bank. It is the digital version of the banknote in your wallet.

That is different from the money in your bank account today. When you see a balance in a banking app, that is a promise from your bank. A CBDC would be a direct claim on the central bank itself, the same as cash.

It is also very different from Bitcoin. Bitcoin has no issuer and no one who can change its rules alone. A CBDC is issued, controlled and designed by the state.

02. How far has it gone?

According to the Atlantic Council's tracker, 146 countries and currency unions, together over 98% of the world economy, are exploring a CBDC. That is the source of the large numbers you see in posts.

But exploring is not launching. By the same tracker, only three countries have fully launched one: the Bahamas, Jamaica and Nigeria. Around 41 pilots are running. China's digital yuan is the largest pilot in the world.

The euro area is preparing a digital euro. A European Parliament committee approved its position in June 2026, and the earliest launch being discussed is 2029. The United States went the other way: an executive order in January 2025 banned work on a US CBDC.

03. What "programmable money" means

Ordinary money does not care what you do with it. Programmable money is money with rules written into it. The rule travels with the money itself, not with the person.

Examples of possible rules: this money can only be spent before a certain date. Only at certain kinds of shops. Only by this person and not transferred. Only for a stated purpose, such as transport or food.

Some uses are harmless or even helpful: a payment that releases automatically when goods arrive, or aid money that reaches the right people. The concern is about who writes the rules, and whether they can be applied to everyday money without your agreement.

04. Real or exaggerated?

The expiry date is real, but only in trials. In January 2021, Shenzhen in China gave 100,000 residents 200 digital yuan each by lottery. The money could be spent only between 7 and 17 January at designated merchants, could not be transferred, and unused amounts were withdrawn. In 2021 Chengdu gave out digital yuan that could only be used for public transport and shared bikes.

These were promotions designed to test the system and encourage spending, not rules on people's normal savings. No country has put an expiry date on everyday CBDC balances.

The European Central Bank has said the digital euro would not be programmable money of this kind. Whether every government keeps that promise in the future is a fair question, and a reason the design and the law around CBDCs matter.

05. Iran's digital rial

The Central Bank of Iran first announced plans in 2018. A pilot began in 2023 on Kish Island, covering person-to-person transfers and merchant payments, and it has since been extended. The digital rial is pegged one-to-one to the ordinary rial and is meant for domestic use.

Public information about the pilot is limited: there are no independently verified figures for how many people use it, and no public date for a nationwide launch. For now, it is a test, not money most Iranians handle.

06. The real questions to ask

Whether a CBDC is good or bad depends almost entirely on its design and on the law around it. These are the questions that matter, for any country:

Privacy: who can see your payments, and under what rules? Limits: is there a cap on how much you can hold? The digital euro plans one, to protect banks. Programmability: can conditions be placed on ordinary balances, or only on specific payments you agree to? Offline use: does it work without internet, like cash? Cash: does physical cash remain available alongside it?

What to take from this

A CBDC is a tool. The same technology can make payments cheaper and faster, or give whoever controls it far more visibility and power over money than cash ever did. Which one you get is decided in the design, and in the law.

When you see a dramatic claim about digital money, ask three things: is this a trial or the real system, which country, and what does the law actually say?