The role of donor funding in enhancing the financial capacity of non-profit organizations is of critical importance. Examining the factors that influence the sustainability of financial donors is especially crucial in Tanzania, where government support for education projects managed by non-profit organisations is insufficient. This paper investigates the key factors influencing donor retention from the donors’ perspective, focusing on three critical aspects: donor commitment, donor involvement, and donor trust. Data were collected from the financial donor profiles of the Tanzania Education Authority (TEA) using a mail survey. A total of 242 usable responses were obtained, representing a 30.3% response rate. Structural Equation Modelling (SEM) was employed as the primary technique for data analysis. The findings of the study indicate that all three key factors; donor commitment, involvement, and trust, have a direct impact on donor retention