The Sale and Purchase Binding Agreement (PPJB) is a preliminary agreement before the implementation of the Sale and Purchase Act (AJB). In practice, many PPJBs are not followed up with the creation of AJB because sellers do not fulfill contractual obligations, thus raising legal protection issues for buyers. This study aims to analyze the legal consequences of PPJB that are not followed up into AJB as well as a form of legal protection for buyers. The method used is normative juridical research with legislative, case, and analytical approaches, using primary, secondary, and tertiary legal materials. The analysis is carried out through systematic interpretation and analogous legal construction. The results of the study show that PPJB that is not followed up with AJB causes default by the seller, which has implications for the birth, change, or removal of the legal relationship between the parties. Even though the buyer has fulfilled the obligation, the land rights have not been transferred juridically because the AJB has not been made before the Land Deed Making Officer (PPAT). As a result, the buyer only acquires contractual rights, not material rights. Legal protection for buyers can be pursued through a default lawsuit that has the potential to result in the cancellation of PPJB, refund of payments, the provision of compensation along with interest, and other legal remedies to restore the rights of buyers in accordance with the principles of legal protection of Satjipto Rahardjo.