While tax jurisdictions worldwide have so far competed freely to lure in multinational investors, unfettered international tax competition has recently come under scrutiny. In New York, political opposition prompted Amazon to cancel its planned investment, giving up $3 billion in promised tax breaks. In Europe, instead, the European Commission has taken the view that, under the existing rules on State aids, EU Member States cannot grant tax advantages to specific investors in the form of advance tax rulings. Multinationals such as Amazon, Apple, and Starbucks have accordingly been enjoined to pay over €15 billion in back taxes. The talk will examine this controversial development in the field of international taxation and the likely outcomes of the appeals brought against the European Commission's decisions before the Court of Justice of the European Union.