Case C-18/15: Judgment of the Court (Fifth Chamber) of 13 July 2016 (request for a preliminary ruling from the Supremo Tribunal Administrativo — Portugal) — Brisal — Auto Estradas do Litoral SA, KBC Finance Ireland v Fazenda Pública (Reference for a preliminary ruling — Article 56 TFEU — Freedom to provide services — Restrictions — Tax legislation — Taxation of interest received — Difference in treatment between resident financial institutions and non-resident financial institutions)