Stressors within companies disrupt the work culture and satisfaction for employees and hence lead to low productivity for the company.This study aimed at assessing the impact of stress on employee performance at National Investment Bank in Accra,Ghana.A cross-sectional descriptive study design which was quantitative in nature was used and a stratified sampling technique was used to sample 45 workers at the NIB facility of which they responded to questionnaires which were analyzed using the Statistical Package for Social Sciences（SPSS）version 20.The study discovered that stress begins in a wide range of work environment thus it is often made worse when employees feel that they have no support from higher authority and colleagues,and find it to control over work processes.Likewise respondents revealed that the major causes of stress are frustration（28.9%）,work overload（26.7%）,role ambiguity（22.2%）,carrier changes（11.1%）and role conflict（6.7%）.The study concludes that workers at NIB get stressed up and these are majorly work related stress.To a larger extent,the work related stress is more shown in them than external stressors that come from outside the scope of work.The study therefore recommends that there should be employee involvement and participation in decision making within organizations and also open communication right from top to down and down to top to enable employee’s voice out their worries.