After eight years of preparation, the European Commission released on 16 March 2011 its Proposal for a Council Directive on a Common Consolidated Corporate Tax Base. The proposed Directive would, on an optional basis, allow group companies to file a single tax return in a single Member State for all group members operating in the European Union. The International Transfer Pricing Journal features a comparative survey examining how this proposal has been received in various Member States, along with an outline prepared by Mr. Louan Verdoner. Country report on Spain.