PurposeThe success of a young entrepreneur depends on how institutional support can facilitate venture performance. Drawing on the institutional theory, this study posited the role of self-efficacy in supporting the effect of institutional support. Self-efficacy is a driving factor for entrepreneurs in managing and implementing business action confidently and successfully. With macro- and micro-oriented research, this study aims to examine how the micro-level factor that is self-efficacy could mediate the influence of macro-level factors (i.e. institutional governance, cultural and social norms and cognitive structure) toward iGen's new venture performance.Design/methodology/approachA total of 462 respondents representing the population of Malaysian iGen entrepreneurs participated in this study. The samples were selected using a multistage sampling technique (i.e. probability cluster sampling technique and non-probability purposive sampling). Survey items were adapted from the previous studies. Structural equation modelling was used, and the first stage involved testing confirmatory factor analysis (CFA) to test the measurement items' unidimensionality, validity and reliability. The second stage of analysis is to test the mediation model.FindingsThe mediation analysis results confirm that the relationship between institutional governance, cultural and social norms, cognitive structure and new venture performance is mediated by self-efficacy. The results confirm that the relationship between institutional governance and cultural and social norms toward new venture performance is fully mediated by self-efficacy. On the other hand, the relationship between cognitive structure and new venture performance is partially mediated by self-efficacy.Research limitations/implicationsFor future research, it is necessary to consider a wide-ranging sample size in improving research generalisation. Moreover, the cross-sectional study only observes the phenomenon at a certain point and cannot explain the process in the correlational relationship. Future researchers are encouraged to adopt a longitudinal study, which allows the researchers to study a sample throughout a period to draw firm conclusions. Survey data also raise the concern of common method variance (CMV), and future studies may use different data types to solve the problem. In addition, future studies are encouraged to examine other factors that could influence new venture performance.Originality/valueThis study extends the current literature on public policy and entrepreneurship. It comprehensively explains the relationship between institutional governance, cultural and social norms, cognitive structure and self-efficacy toward new venture performance. This study was also conducted in a developing country and iGen context, which can offer new insights into the current literature. Many empirical studies have applied institutional theory in examining entrepreneurship action and behaviour, yet the scholarly consecration on micro-level factors is limited. With macro- and micro-oriented research, this study has examined the influence of self-efficacy as a potential mediating variable.