Ireland made some kind of special arrangements. For example Apple paid the full tax for products sold in Ireland but only aprox 1% or even less for the products sold in the rest of EU. It's like saying "come to Ireland" and pay no tax to the rest of EU. Ireland is happy because they cash in the tax for the products sold in Ireland plus an extra for the products sold in the rest of EU. If you ask me tax should be paid where the profit is generated.