Tax administration particularly in developing countries is a challenging and cumbersome task and it can be affect employee satisfaction. The purpose of this study is to examine the effects determinant factors on employee satisfaction by taking the case of BDCA revenue authority. To achieve this objective, explanatory research design was applied. Exclusion and census sampling technique was used to select respondents and a total of 80 employees were participated in the study. The study used primary sources of data and it was collected using a standardized questionnaire. The collected data then was analyzed quantitatively using correlation and multiple regressions using SPSS version 20. Findings from the study revealed that nature of work and pay has positive and workload inverse relation with job satisfaction. But job security hasn’t relation. Moreover, based on the regression coefficient, the most contributing factor is nature of work. In addition, the three factors (nature of work, workload and pay) are statistically significant. But job security is insignificant to job satisfaction. Based on the results it is recommended that management needs to improve the nature of work, workload and pay in order to enhance employees’ satisfaction.