The European Commission has confirmed it believes Apple and Ireland breached guidelines on state aid over Apple's Irish tax arrangements.
In keeping with its zeitgeist-grabbing history, Apple was one of the first U.S. companies to lead the charge in relocating much of its earnings to Ireland.
This decision, which has led to the maker of the iPhone paying rates of around 2 percent tax in some years (compared to corporation 35 percent in the U.S.), has got it in hot water with European tax authorities. The Irish government and Apple have vehemently denied any wrongdoing.
Here, we outline what's been happening, and what the likely developments are.