48It must be borne in mind that a measure which creates an exception to the application of the general tax system may be justified by the nature and overall structure of the tax system if the Member State concerned can show that that measure results directly from the basic or guiding principles of its tax system. In that connection, a distinction must be drawn between, on the one hand, the objectives attributed to a particular tax scheme which are extrinsic to it and, on the other, the mechanisms inherent in the tax system itself which are necessary for the achievement of such objectives (judgment of 6 September 2006, Portugal v Commission, C‑88/03, EU:C:2006:511, paragraph 81).
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