The Unit for EU and Treaty Law is responsible for:

• the preparation and implementation of international treaties, unless they fall within the competence of another organisational unit, and questions of treaty law
• questions of European Union (EU) treaty law
• the provision of expertise and advice on EU law and international treaties
• participation in the legal development of the institutional structure and decision-making and legislative procedures of the EU
• the maintenance of a treaty register, and the registration of treaties with the United Nations
• functions of the depositary of international treaties
• general legal questions relating to privileges and immunities
• legal questions concerning the Åland Islands
• the preparation of national legislation, unless the issue falls within the competence of another organisational unit, and the guidance and development of the preparation of legislation
• the inspection of treaties and legislation.