"EU-internal tax loop holes" such as the well known tax reductions on patent/copyright/design/etc royalties, which are still 0% in the Netherlands: https://en.

"EU-internal tax loop holes" such as the well known tax reductions on patent/copyright/design/etc royalties, which are still 0% in the Netherlands: https://en.wikipedia.org/wiki/Dutch_Sandwich https://en.wikipedia.org/wiki/Dutch_Sandwich