Judgment of the General Court (Ninth Chamber, Extended Composition) of 16 May 2019.#Republic of Poland v European Commission.#State aid — Polish tax on the retail sector — Progressive tax levied on turnover — Decision to initiate the formal investigation procedure — Final decision classifying the measure as State aid incompatible with the internal market — Notion of State aid — Condition relating to selectivity.#Joined Cases T-836/16 and T-624/17.