What is DAC8?

If you use an exchange abroad, can your transaction data reach AADE (Greece’s Independent Authority for Public Revenue)? With DAC8, there is an organized mechanism for that. Think of a file containing your details and aggregate transaction data, which the provider sends to the competent tax authority. When it concerns a tax resident of another EU country, the relevant information is automatically exchanged with that country.

Reporting providers collect identification details, tax residence and tax identification number, such as the Greek tax ID (AFM). They report annual aggregate figures per asset and per type of transaction. Exchanges of crypto for euros or other crypto and certain transfers are covered, and the scope includes stablecoins and certain NFTs. Domestic transactions are covered too, not just cross-border ones.

Why it matters

The criterion is mainly tax residence, not citizenship. If you’re a Greek tax resident and swap bitcoin for euros on a reporting exchange in another EU country, that information may be passed on to AADE. Under certain conditions, the obligations also cover providers outside the EU that serve EU residents.

We consider the distinction between reporting and taxation crucial. Reporting a transaction doesn’t automatically mean tax is owed. The information file is not a tax assessment: it doesn’t by itself calculate your taxable gain or replace your tax return.

In Greece

DAC8 is Directive (EU) 2023/2226. It was transposed by Law 5301/2026, which amends Law 4170/2013, with the relevant provisions applying from January 1, 2026. The first reports cover activity in 2026. The first exchange of information between tax authorities must take place by September 30, 2027. That is not the deadline for filing your own tax return.

What to watch out for

Keep dates, acquisition costs, fees and records from exchanges and wallets. The total transaction values reported are not the same as your gain. DAC8 doesn’t set a Greek tax rate; the tax treatment is examined separately, based on the applicable rules and your actual data.

Self-custody doesn’t create a general obligation under DAC8 for you to personally report every movement in a private wallet. Some transfers made through a reporting provider to external addresses, however, may be reported. Simply holding crypto is not the same as exchanging it. To fill in your tax return, especially with staking, mining or older purchases, you need personalized guidance from a tax professional.