What does AADE have to do with crypto?

Can the Greek tax office find out about your transactions on a foreign exchange? Yes, as long as they fall under the reporting and information-exchange rules. But that doesn’t mean every reported amount is a profit or that tax is automatically owed.

Think of a bank account statement: an incoming transfer might be a payment for work, a refund, or a move of your own money. Likewise, in crypto you need to tell apart a purchase, a sale, a swap and a transfer between your own wallets.

How the data reaches AADE

The EU’s DAC8 Directive, i.e. Directive (EU) 2023/2226, provides for the collection and exchange of information on crypto-asset users and transactions. Greece transposed it with Law 5301/2026, in particular Article 8. The relevant provisions apply from January 1, 2026.

The direct reporting obligations fall mainly on the providers covered by the rules, such as exchanges. They may ask you for your tax ID (AFM) and tax residence details. For activity in 2026, the first exchanges of information between EU tax authorities are scheduled by September 30, 2027. This doesn’t give AADE an automatic view of every wallet.

Why it matters

If you are a Greek tax resident, data on your covered activity in another EU country can reach AADE. What counts is tax residence, not simply Greek citizenship.

We separate two questions: what data is reported, and what tax is owed. Reporting transactions is not an act of imposing tax. DAC8 doesn’t set a tax rate, and MiCA isn’t an income tax rule either.

What to watch out for

The law the Greek Parliament passed on November 5, 2026 taxes individuals’ gains from selling crypto at 10%, from tax year 2027, with no tax if the year’s net gain is no more than €500. Income from staking and DeFi is taxed at 15%. So sales, staking and payment for work are not treated the same way.

All the details are in the guide to the new law, and you can work out your tax with the crypto tax calculator.

Keep your transaction history, purchase costs, fees and proof of where your money came from. These help separate proceeds from profit and document transfers or large purchases. For a specific tax return, you need an accountant who knows crypto and a check of the legislation in force at the time.