Abstract Trust and confidence are the foundations of a banker-customer relationship. As a result, any information customers submit to their bankers is expected to be kept confidential. This expectation can only be met if the relevant legislative frameworks are in place to ensure that bankers are held accountable for their confidentiality agreements. While there is legislation in place to protect the privacy of customer information in Tanzania, a growing number of laws, notably those dealing with crime prevention and control, have been enacted, with the consequence of undermining bankers’ confidentiality obligations. Therefore, this article examines how recent legislative and judicial developments have addressed the confidentiality obligations imposed on bankers. In general, it has been observed and established that the protection of customers’ information provided by banking laws is usually degraded by other laws, particularly those pertaining to crime prevention, hence weakening banker’s duty of confidentiality.