Travelling to another country for a valid reason like client visits, interoffice visits etc...this is normal business. But if a person voluntarily works from another tax jurisdiction for their own personal reasons then it is a different scenario...For instance I can visit my colleagues for work purposes in one country. That same country, I am not allowed to just travel to for my own reasons and work in at all, despite being legally allowed to work there under EU law. Even though it is the same country and the same legal entities the purpose is different and the tax treatment will be different. And for most other countries the max I can do this for is 20 days. Companies are just trying to protect themselves from tax/compliance expense due to employee activity which is not business related. In the same way I am not allowed to claim any expenses if it is me who chooses to travel, the company does not want to be out of pocket.