A document submitted by the European Commission to member states and the European Parliament shows that it is evaluating the possibility of including the crypto industry into the EU's unified tax system.

The document estimates that a 0.1% tax on crypto transaction volume could generate approximately 3 billion to 4 billion euros annually for the EU budget;
Taxing crypto capital gains could bring in about 1 billion to 2.4 billion euros per year.
However, the European Commission stated that due to limited industry data, there is still significant uncertainty in the revenue estimates.
The above plan aims to provide additional funding sources for the EU budget from 2028 to 2034, and still requires the unanimous approval of all 27 member states. (Politico)