According to Article 153 of the Constitution, if the Constitutional Court annuls provisions of a law, presidential decree, or the rules of procedure of the Grand National Assembly of Turkiye, the annulled provisions cease to be effective upon the publication of the annulment decision in the Official Gazette. The mentioned article grants the Court the authority to determine, if necessary, the date on which the annulled decision will come into effect, not exceeding one year from the date of publication of the annulment decision. Upon examination of the annulment decisions of the Court, it has been observed that in approximately half of the annulment decisions, the Court has additionally determined the date on which the annulment decision will come into effect. The Court tends to use this authority more intensively in its decisions regarding Presidential Decrees. However, almost all of these decisions are those where the annulled Presidential Decree provision was annulled on the grounds of lack of authority regarding the subject matter. In other words, the Court annulled them on the grounds that the President has not have the authority to regulate the annulled issue. This exceptional situation highlights the difference in application from practices regarding laws concerning the suspension of the effectiveness of annulment decisions. In this study, the general rule of deferring the effectiveness of annulment decisions will be analyzed, followed by a discussion of the applicability of the deferral institution in annulment decisions regarding Presidential Decrees.