Ireland must recover up to 13 billion euros ($14.6 billion) in unpaid taxes from Apple, European officials said on Tuesday.
The tax ruling is the biggest the European Union has ever made regarding a single company, and it could spark a huge transatlantic row over how Europe treats U.S. companies.
Apple shares initially fell almost 3%, but then recovered most of their losses. The company will appeal the decision. It said the ruling upended the international tax system and would damage jobs and investment in Europe.
The European Commission, which administers EU law, said the Irish government had granted illegal state aid to Apple (AAPL, Tech30) by helping the tech giant to artificially lower its tax bill for more than 20 years.