32In this respect, it must be held that the FEU Treaty offers no guarantee to a worker that extending his activities into more than one Member State or transferring them to another Member State will be neutral as regards social security. Given the disparities in the social security legislation of the Member States, such an extension or transfer may be to the worker’s advantage in terms of social security or not, according to circumstances. It follows that, even where its application is less favourable, such legislation is still compatible with Articles 45 and 48 TFEU if it does not place the worker at a disadvantage as compared with those who pursue all their activities in the Member State where it applies or as compared with those who were already subject to it and if it does not simply result in the payment of social security contributions on which there is no return (see, to that effect, judgment of 1 October 2009, Leyman, C‑3/08, EU:C:2009:595, paragraph 45 and the case-law cited).
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