If you make an assumption that something is true or will happen, you accept that it is true or will happen, often without any real proof. This type of agreement transfers the obligations of one party under a contract to another party.Use this sample agreement to draft an assignment and assumption agreement for use as an ancillary document in the context of an asset purchase transaction. An Assumption Agreement is a legal document through which one party transfers its obligations or duties under a contract to another party. "Affiliate" shall have the meaning set forth in the Purchase and Assumption. This motor vehicle is being transferred.