In a world of competing flag States and short‐term employment, enjoying the benefits provided by a social security system is a difficult, if not impossible, task for many seafarers. The Maritime Labour Convention, 2006, has abandoned the flag State principle in favour of the residence principle for that reason. This article addresses the implementation challenges of this approach by examining the European Union case, and highlights the advantages of the residence principle in terms of administrative efficiency and effectiveness, enhanced coordination between social security contributions and personal income tax in cross‐border situations, and better use of State aid measures.