Mobile commerce has been booming with the development of mobile technology, which has made mobile payment services highly valued by mobile payment service providers and consumers. This study integrated facilitating factors (perceived transaction convenience, social influence, additional value, government support) and inhibiting factors (psychological risk, financial risk, privacy risk) to explore which ones influence users’ usage intentions to use mobile payment services. A research model was developed and empirically tested by using structural equation modeling (SEM) on datasets consisting of 602 mobile payment services users through an online survey questionnaire in Taiwan. Our findings show that the facilitating factors had a significant positive impact on usage intention, with the greatest impact from the factor of government support. Moreover, perceived risk had a significant negative impact on usage intention, with the greatest impact from the factor of financial risk. Therefore, this indicates that consumers take whether there is a financial loss in the process of using mobile payment service into consideration as the major factor to use it.