This study examines how visualization and interactivity affect accuracy, confidence, and calibration in a financial decisionmakingcontext. Decision-makers are typically overconfident and this research proposes that visualization and interactivitycan reduce calibration, increasing overconfidence. An experiment was conducted with 157 participants and the resultsshowed that visualization and interactivity features can increase decision-maker confidence independently. However,interactive visualization, both interface features, are required to increase accuracy. As a result, when interactivity andvisualization are offered individually, decision-makers become overconfident, less calibrated. Implications for designers arediscussed.