In the article the invalidity of transactions and its legal consequences in civil law of Germany are studied. The author provided a comparative legal analysis of the German and Ukrainian legal doctrine and legislation.
The main attention was focused on the features of the German law relating to the invalidity of transactions. The author analyzed the definition of invalidity and made a conclusion that it is very similar to Ukrainian legislation. In the center of scientific interests disposes the classification of transactions on promissories (real) and dispositives. This classification is not known our legislation but is very shared in Germany. The importance of this differentiation consists in that there are separate consequences on invalidity of such transactions. Also the principle of abstraction plays very important role in law of Germany, which one nature is that promissories (real) and dispositives transactions are independent from each other. In addition, the author has analyzed the consequences of invalidity of transactions, primarily unjust enrichment (condition). Researcher gives consideration that the consequences of invalidity of transactions in Germany differ from Ukraine, but this does not exclude of possibility
of using foreign experience in our law science and practice.
Keywords: invalidity of transactions, contracts and administrative transactions, the principle of abstraction, the legal consequences of invalidity of transactions, restitution