This study aimed to develop a conceptual model of the mediating role of management accounting system (Broadscope) and organizational culture on the influence of mutual dependency and environmental uncertainty on managerial performance. The sample was 126 managers of Swamitra Palm Oil Plantation in Riau. The entire population was sampled. The data were processed using Structural Equation Modeling Partial Least Square (SEM PLS). The findings in this study are mutual dependency and environmental uncertainty have a positive influence on managerial performance, organizational culture mediates the influence of environmental uncertainty on managerial performance, meanwhile management accounting system (Broadscope) does not mediate the influence of mutual dependency on managerial performance.