24According to settled case-law, Article 13 of the Protocol restricts the Member States' sovereignty in fiscal matters, since it precludes any national tax, regardless of its nature and the manner in which it is levied, which is imposed directly or indirectly on officials or other servants of the Communities by reason of the fact that they are in receipt of remuneration paid by the Communities, even if the tax in question is not calculated by reference to the amount of that remuneration (Commission v Belgium, cited above, paragraph 10; Tither, paragraph 12; and Case C-263/91 Kristoffersen v Skatteministeriet [1993] ECR I-2755, paragraph 14).
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