ABSTRACTThe current era is the wonderful age of information and knowledge; the age of incredible acceleration of technology and creativity. In recent years, a wave of implementation and operation of office automation systems has swept the country and many organizations have shown a desire to use these systems. The main objective of this study is to investigate the impact of office automation systems on enhancing employee performance at Semnan Province Department of Tax Administration, Iran. This research is a descriptive-survey research in terms of method and, in terms of objective, can be classified as an applied research. The statistical population of this study is all employees of the General Department of Taxation of Semnan Province with a degree equivalent to and above high school diploma to 317 people. The statistical sampling method of this research, according to its subject and nature, is stratified sampling with appropriate allocation for employees and educational classes. The Cochran formula yielded an estimate of the sample population equal to 174 participants. Data are analyzed using the SPSS software. Diagrams have drawn by the EXCEL software and structured equations have calculated by the AMOS software. All research hypotheses are verified and the results show that the office automation system is effective in improving employee performance. Manuscript profile