This article examines the problematic aspects of the qualification of legal categories involved in the formation of the rules of contractual succession and, accordingly, determining the essential components of transactions of this legal institution.Also this article analyzes collision links that determine the models of legal regulation in situations determined by donation and donation in case of death conflict factors. Donation in transactions and contracts, provided by contractual succession is involved as a legal basis, in special cases determining subject and object status of the participants in a particular relationship. Also, donation is involved in the formation of the will of the participants.Article considered issues related to the qualification of concepts in accordance with the factor determining the right to establish succession contracts and the right of the place of execution of these contracts.