According to the basic rules of sharia and the general rule of contracts, the registration of any transaction is not considered one of its elements and does not affect its validity, but only has a proof aspect. Nevertheless, the new needs of the society require that immovable transactions be registered. The author of the present study, employing a descriptive-analytical method and collecting data through desk research, aim to examine and elucidate the most significant harms resulting from the non-mandatory registration of real estate transactions within our legal system. The findings of this research indicate that transactions concerning immovable property, if not registered, entail multiple adverse effects; to such an extent that they currently give rise to numerous problems within the social system. The continuation of this situation, in addition to fostering widespread corruption, poses a threat to both the economic and judicial systems and, in certain cases, undermines judicial justice.