Judgment of the Court (Third Chamber) of 8 May 2019.#SF v Inspecteur van de Belastingdienst.#Request for a preliminary ruling from the Hoge Raad der Nederlanden.#Reference for a preliminary ruling — Social security for migrant workers — Regulation (EC) No 883/2004 — Article 11(3)(e) — National of a Member State employed as a seaman on board a vessel flying the flag of a third State — Employer established in a Member State other than the worker’s State of residence — Determination of the applicable legislation.#Case C-631/17.