Tax harmonisation has been controversial since the establishment of the European Economic Community, and corporation tax proposals are currently on the table in the EU. Although tax competition can be beneficial, tax harmonisation could curb tax competition that leads to the under-provision of public goods or to burden-shifting from mobile to immobile tax bases. As yet, no agreement has been reached on any ambitious harmonisation plan for mobile tax bases. This column explores the possibility of implementing partial tax harmonisation for corporate taxation and the taxation of the banking sector.