Well, aren’t domestic companies used by them, too? Offshore tax havens have for decades been the target of blackmail and slander campaigns by the governments of the powerful high-tax jurisdictions. Your government would quite certainly like You to believe that offshore companies are only used by fraudsters and criminals – but that’s completely unjustified. While there will be a rotten apple in any basket (especially, if the basket is big enough), 99% of all business transacted through offshore companies is completely legitimate. In fact, due to the inherent need to maintain their reputations clean, most of the leading tax haven countries nowadays have much better systems to detect and prevent financial crime and money-laundering than the big, powerful nations who critize them.