24While EU primary law admittedly can offer no guarantee to an insured person that moving to a Member State other than his Member State of origin will be neutral in terms of social security, in particular where sickness benefits and old-age pensions are concerned, since, given the disparities between the Member States’ social security schemes and legislation, such a move may be to the advantage of the person concerned in terms of social protection, or not, depending on the circumstances, it is settled case-law that, where its application is less favourable, national legislation is consistent with EU law only to the extent that, in particular, it does not place the worker concerned at a disadvantage compared with those who pursue all their activities in the Member State where it applies and does not purely and simply result in the payment of social security contributions on which there is no return (see judgment of 21 January 2016 in Commission v Cyprus, C‑515/14, EU:C:2016:30, paragraph 40 and the case-law cited).
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