For residents of the countries in the European Economic Area (EU countries + Norway, Iceland and Liechtenstein) and Switzerland, a national passport or ID will suffice. Workers from outside the European Economic Area or Switzerland must have in addition to their national passport, a residence permit and a work permit for the EEA country where they usually work, valid for at least the entire duration of their posting to the Netherlands. You can find more information about employees from outside the European Economic Area or Switzerland here.