In Europe, the competence for social security and the right to levy income tax lie with the country of employment in cross-border matters. This has two disadvantages. First, the Employment Principle distorts active persons' choice of place of work. Second, the employment-based regulation of...

Delayed Integration ("DI") is a rule for taxing migrants. It requires that immigrants be taxed in the receiving country only after some period of transition. Conversely, emigrants are released from the obligation to pay home taxes only after a certain period. DI is an alternative ti the...