Case C-150/25, Marhaux: Judgment of the Court (Fifth Chamber) of 12 March 2026 (request for a preliminary ruling from the Tribunal de première instance du Luxembourg – Belgium) – BX v État belge (Reference for a preliminary ruling – Article 45 TFEU – Freedom of movement for workers – Income tax – Employment income received in another Member State – Exemption with progression in the Member State of residence – Failure to apply a bilateral convention for the avoidance of double taxation by a contracting State – Loss of part of the tax advantages relating to the personal and family circumstances of the taxpayer)