This comprehensive textbook provides a concise introduction to the tax regulations necessary for analyzing and evaluating the impact of taxation on business decisions. Unlike many other introductions, this work does not focus on specific types of taxes. Instead, the authors align their discussion with entrepreneurial activities and specifically illustrate the resulting tax consequences. An excursus addresses the upcoming changes due to the corporate tax reform of 2008. A quick entry into the subject matter is facilitated by concentrating on central principles, practical examples, and an extensive glossary that explains important basic concepts of taxation. At the same time, it imparts the fundamental knowledge of German national tax law relevant to entrepreneurial actions.