Apple's European headquarters are based in Cork, Ireland.
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- The EU's top court ruled Apple must pay over €13 billion in back taxes.
- The European Court of Justice's decision ends a decadelong legal battle with the tech giant.
- EU competition chief Margrethe Vestager argued Apple received unfair tax breaks from Ireland.
The EU's top court just dealt Apple a major blow, ruling that the tech giant must pay more than €13 billion (about $14 billion) in back taxes.