The European Court of Justice has ruled that Apple must pay 13 billion euros in back taxes to Ireland, following a 10-year court battle. The case stems from a 2016 decision by the European Commission that Apple had received 'illegal' tax benefits from Ireland over two decades. Apple will incur a one-time income tax charge of about $10 billion in its fourth fiscal quarter. The ruling is a significant development in the ongoing conflict between US tech giants and the EU over taxation and antitrust issues.