Ireland's economic statistics are so badly distorted by US companies routing money there that there is an entire subfield of economics dedicated to trying to figure out what Ireland's real economic state is, called "Leprechaun economics". A common adjustment made by economics researchers when studying the EU is to just subtract Ireland entirely.
https://en.wikipedia.org/wiki/Leprechaun_economics
https://www.cfr.org/articles/leprechaun-adjusted-euro-area-g...
https://democracychallenged.com/2025/05/14/irelands-phantom-...
> The key to understanding this disconnect is a number few outside Ireland pay attention to: Modified Gross National Income, or GNI*. Unlike GDP, which counts all activity happening within Ireland’s borders, GNI* adjusts for the distortions caused by the huge presence of foreign multinationals. And the gap is enormous. In 2023, GNI* was just €291 billion — meaning more than €219 billion of Ireland’s reported output never truly flowed into the Irish economy at all.
When looking at Ireland's own economy without the influence of US tax transactions, the economy shrinks by nearly half.