The purpose of this research is to develop a mobile application model for monitoring education financing in junior high schools in Deli Serdang Regency by implementing a collaborative managerial assistance program. This research continues previous research which has developed a model of education financing management to optimize the marginal contribution of schools. One strategy that has been successfully implemented in the financing management model is supervisory assistance. Through this research it is hoped that it will be able to produce a model of managerial assistance program that is most appropriate in the implementation of the education financing oversight function. Furthermore, in implementing the supervisory function, a mobile application was designed to carry out supervision of education financing in schools. This study uses a qualitative research method that aims to identify phenomena that occur in the field to be presented in the form of a model for monitoring education financing. The research was conducted from February to October 2023 at junior high schools in Deli Serdang Regency. The author determines two schools as a place to make observations. Respondents consisted of the Head of the Junior High School Section of the Deli Serdang Regency Education Office, the Principal, the Deputy Principal, the School Treasurer, and the School Supervisor. Through the development of a school education financing supervision model, it is hoped that it will be able to improve the supervisory function in the stages of school education management. The model for supervising school education financing will greatly contribute to increasing the efficiency and effectiveness of fund management, the quality of education, and the transparency and accountability of school finances.