Today, Human resources are known as the most important and valuable resource for organizations’ successes. Social loafing leads directly to reduction of staff performance and their productivity. Therefore this research is investigating effect of colleague's perceived social loafing, negative affectivity and perceived organizational justice on the social loafing of tax administration’s staff in west of Tehran. This research investigate its six theories throughout organizational commitment in the early six month of the year 1394. This research is a practical research in terms of purpose and is a descriptive-survey research in terms of collecting data and a casual type. In order to calculate the sample volume Morgan and Kerjesey table were used. Since in each research some of questionnaires won’t return, 300 individuals were chosen as the sample using random sampling method and 270 questionnaires were collected and analyzed. Results showed that the colleague's perceived social loafing, negative affectivity and each dimensions of the perceived organizational justice has a positive and meaningful effect on organizational commitment and similarly the organizational commitment on the staff’s social loafing. Therefore, all of the theories have been approved.

Keywords: colleague's perceived social loafing, negative affectivity, employees' social loafing, Organizational Commitment, Dimensions Of Perceived Organizational Justice

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