15Consequently, there is under EU law a clear distinction between income subject to the control of the national tax authorities of the Member States, on the one hand, and the salaries of officials and other servants of the Union on the other, since those salaries are subject to EU law alone as regards any liability to tax while the other income of officials remains subject to taxation by the Member States (see, to that effect, judgment in Humblet v Belgian State, 6/60-IMM, EU:C:1960:48, p. 578).
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