This article reviews the functions of transaction avoidance in German insolvency law. First it considers the effectiveness of transaction avoidance law from the point of economics. The author evaluates what incentives are created by the actual transaction avoidance provisions and how do they affect the moment the insolvency petition is filed and the possibility of rescuing the company. Separately the author gives the evaluation of strategies of the secured creditors, whose interests are not the same with the general body of creditors. The second part analyzes the prerequisites which are mandatory for the successful avoidance of the transaction.