At issue in this case was whether Belgian arm’s length provision in article 344 infringed Article 170 of the Belgian constitution, according to which a tax in favor of the State may only be introduced by law. “Does Article 344(1) of the Income Tax Code 1992, in the version applicable to the assessment years 1996, 1997 and 1998, infringe Article 170 of the Constitution, in particular Article 1 of that article, which provides that a tax for the benefit of the State may be introduced only by a law, in that Article 344(1) gives the executive authority the task of determining the taxable circumstances or at least makes it possible to determine taxable circumstances either by means of a standard to be laid down by the State itself or by means of a blank form to be filled in?» The Decision of the Court In accordance with the principle of legality in tax matters, as set out in Article 170(1) ...
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