The use of mobile money services has brought benefits such as sending and receiving of money, payment of bills, reduction in cost of transactions, transactions time, loss of sales, and reliable savings options and convenience. Unfortunately, despite the cited benefits the adoption and use of mobile money services by traders in business activities has been observed to be low globally and Uganda inclusive (Kyeyune et al., 2012). Furthermore, despite the numerous benefits of using mobile money services for transactions, the facility is apparently not widely adopted among traders in Kampala. However, whether there are significant determinants that have not been factored into the Unified Theory of Acceptance and Use of Technology (UTAUT) model or there exists significant inhibitors that need to be mitigated so that traders in Kampala may adopt the use of mobile money services, is not yet investigated, reported on and incorporated in the wealth of knowledge on technology adoption. This paper presents the results of a study that determines the determinants of mobile money service (MMS) adoption among traders in Uganda as an attempt to bridge this gap for developing country. Requirements for the study were extracted from the field study extending the original determinants that existed in the original Unified Theory of Acceptance and Use of Technology (UTAUT) model. The determinants included level of exposure, legal issues, sensitization, security, performance expectancy, effort expectancy, social influence, and facilitating condition.