Joined Cases C-398/16 and C-399/16: Judgment of the Court (First Chamber) of 22 February 2018 (requests for a preliminary ruling from the Hoge raad der Nederlanden — Netherlands) — X BV (C-398/16), X NV (C-399/16) v Staatssecretaris van Financiën (Reference for a preliminary ruling — Articles 49 and 54 TFEU — Freedom of establishment — Tax legislation — Corporation tax — Advantages linked to the formation of a single tax entity — Exclusion of cross-border groups)