This study examined the impact of performance expectancy, effort expectancy, and citizen trust in institutions on the adoption of an electronic voting system. This was done by proposing and validating a unified model of electronic voting system adoption (UMEVSA) based on UTAUT. The results show that while performance expectancy was significant in determining the intention to adopt an e-voting system, effort expectancy does not. However, effort expectancy was found to be a positive determinant of the performance expectancy of an electronic voting system. Also, citizen trust in institutions positively predicts both the performance and effort expectancy of an electronic voting system and the intention to use an electronic voting system. The implications of these findings are discussed.