Brussels, 03/04/2012 (Agence Europe) - On Monday 2 April, the European Commission launched an in-depth investigation of direct tax systems in various member states to see whether they are penalising workers who live in one member state and work across the border in another compared with workers residing in the country where they work. Any such discrimination would violate the EU's single market rules. The investigation will continue throughout 2012 as a measure to help boost the single...