The causa mortis succession is a legal phenomenon from which no human being can escape. Thus, organizing the succession itself is an important gesture, which in general brings greater utility to the assets that are part of the heritage and greater comfort to the successors. Within this premise, the present work seeks to deal with the donation contract and its relationship with succession law, whether from the logic of a planned succession, or in the face of problematic situations where liberalities are carried out without the legal guise of a contract of Donation. The last chapter of the work deals, in turn, with donations and their consequences for after the opening of the succession, paying special attention to the legal institute of collation and the hypotheses of exclusion from the duty to collate.