The principle of non-discrimination in international and European tax law

Book excerpt: The principle of non-discrimination plays a vital role in international and European tax law. This dissertation analyses the interpretation given to that principle in tax treaty practice and in the direct tax case law of the Court of Justice of the European Union (ECJ) on the fundamental freedoms. The objective of this analysis is twofold: to give a clear and thorough overview of both standards and to determine whether they share a common, underlying principle of non-discrimination. In order to achieve these objectives, a comprehensive selection of case law is discussed from the perspective of the two constitutive elements of discrimination, comparability and the existence of different treatment. Moreover, attention is drawn to the question whether a domestic measure that is found to be discriminatory may nevertheless be justified on the basis of reasons of public interest. Finally, the possible interplay between both standards is addressed.