This study aims to analyze the effect of promotion, service quality, and trust on interest in becoming a customer at a private bank. The population in this study was customers of PT. BPR Mertha Sedana with a sample size of 100 people. This type of research is quantitative with data collection techniques using questionnaires, and the data analysis technique used is multiple linear regression analysis assisted by the SPSS program. The results of the analysis show that Promotion has a positive and significant effect on student interest, with a significance value of 0.034. Service quality has a positive and significant effect on student interest, with a significance value of 0.000. Trust has a positive and significant effect on the decision to become a customer, with a significance value of 0.000. Promotion, service quality, and trust together have a positive and significant effect on the decision to become a customer, with significance value of 0.000 so that the hypothesis is accepted.