The Member States 25 March 1957, Consolidated version of the Treaty establishing the European Atomic Energy CommunityTITLE II - Provisions for the encouragement of progress in the field of nuclear energyCHAPTER 9 - THE NUCLEAR COMMON MARKETArticle 98

Non European territories under the jurisdiction of a Member State may, however, continue to levy import and export duties or charges having equivalent effect where they are of an exclusively fiscal nature. The rates of such duties and charges and the system governing them shall not give rise to any discrimination between that State and the other Member States.