The European Union’s highest court backed on Tuesday a European Commission ruling that Apple must pay €13 billion ($14.4 billion) in back taxes, annulling a previous ruling in Apple’s favour. In 2016, the European Commission ordered the multi-billion euro tax payment, arguing that the US company had underpaid taxes due in the bloc following a suspected sweetheart deal with EU member Ireland. Apple filed a successful complaint with the EU’s general court, arguing that the commission had failed to prove that the contested tax deal constituted prohibited state aid. The general court had sided wit…