Public organizations are massively using ICTs. Leading to e-government development, they expect creating public value. However, little empirical evidence about achieving the expected benefits exists. Focusing on the private sector, the extant theoretical models for IT value are not suitable for e-government. This research builds on the DeLone and McLean (D&M) IS success model and the e-government public value perspective to propose and test a model of e-government success from the perspective of government employees. Organizational performance and environmental sustainability are investigated as the two main dimensions of e-government public value in relation with the three quality variables, intention to use and user satisfaction. Based on PLS-SEM techniques, the results show that an intention to use the taxation system and user satisfaction lead to public value measured by organizational performance and environmental sustainability. They demonstrate the adequacy of the research model to assess e-government value from the standpoint of the government employees.