There's such a thing as internal charges. The customer buys from the domestic subsidiary at low margin, the domestic subsidiary sources from the foreign subsidi

There's such a thing as internal charges. The customer buys from the domestic subsidiary at low margin, the domestic subsidiary sources from the foreign subsidiary at a tremendous margin. https://www.bloomberg.com/news/articles/2016-12-16/the-inside-story-of-apple-s-14-billion-tax-bill https://www.bloomberg.com/news/articles/2016-12-16/the-insid... "The investigators say the company channeled profits from dozens of countries through two Ireland-based units. In a system at least tacitly endorsed by Irish authorities, earnings were split, with the vast majority attributed to a “head office” with no employees and no specific home base -- and therefore liable to no tax on any profits from sales outside Ireland. The U.S., meanwhile, didn't tax the units because they’re incorporated in Ireland."