This thesis study focuses on the corporate taxation reform preparations within the internal market of the EU. The author tries to determine the scope of corporate taxation and the current condition within the EU and its Member States. It focuses on the EU Commission activities regarding the subject and especially the solution approaches available. While inspecting the approaches, the author especially takes 'comprehensive solutions'; Home State Taxation, Common (Consolidated) Base, EU Company Income Tax and Single Compulsory Harmonized Tax Base, under magnifying glass and tries to eliminate by comparison, which one of these systems would be favored by EU in the near future. EU Commission papers, reports and the Commission's Conference on Co...