Last week we shared information about withholding US social security tax from wages. This week, we want to talk about social security within the European Union (EU), European Economic Area (EEA), and Switzerland. Many of the conversations we have with companies sending business travelers intra-EU involve a deep sigh and a shake of the head. Getting the Posted Worker Directive (PWD) and social security withholding obligations correct when sending an employee from one EU-member state to another is a necessary statutory requirement; yet for most it is an administrative challenge.