It's here: https://www.tax-the-rich.eu/home#proposition, click on "Legilative procedures"
"The introduction of a European wealth tax requires three legislative stages:
1 The European Commission is to propose a directive based on Article 115 TFEU, which allows the Council, acting unanimously, to adopt directives to harmonize national legislation, particularly in the field of direct taxation."
1/2
@thomasjorgensen
2/3
"2 Secondly, an amendment to Council Decision 2020/2053 (article 311, paragraph 3 TFEU) will have to be proposed, enabling this tax to contribute to the EU's own resources."