30It should be noted that the inclusion of exempt foreign income in the calculation of the Belgian tax rate, in the calculation of Belgian tax and in the tax base for the granting of tax advantages comes within the Kingdom of Belgium’s freedom to choose how to organise its tax system on the basis of the principle of fiscal autonomy and cannot be considered to be contrary to the free movement of workers provided that the effects of such inclusion does not amount to discriminatory treatment contrary to EU law (see, to that effect, judgment of 6 December 2007, Columbus Container Services, C‑298/05, EU:C:2007:754, paragraph 53). Such an inclusion does not, of itself, prevent ensuring the effective exemption of that income in accordance with EU law, where relevant by means of subsequent compensation.
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