Banking has been a part of the economy which leads to a whole structure of banking services to the public. It is a way of getting utility services and other services from one person to another without any struggles. In the present era, the effects of demonetization has a significant place, now itself many of the people were carrying and holding old currency notes even in the form of black money or as a result of speculation or hoarding activities. Some of people are not aware of the procedures for exchanging these old ones by new currency notes. The main importance of this topic is to eliminate evil of corruption and demolish the usage of black money. By this work it is pointing out upto what extend the Tamilnadu Mercantile Bank Ltd can control these activities and it is relevant to not how they manage their affairs during the time of demonetization. The main aim of the study included what extend the bank had served the ultimate goal of demonization and was they successful in implementing the procedures in the bank. The participation of employees, customers and other faculties in the bank, their feedbacks and opinion about the scheme and how they crossed the risk at the time of demonization.