Over the last decades, remarkable advances in survival in patients with congenital heart disease (CHD) have been reported. Currently, 90% of infants born with CHD can expect to reach adulthood. Moderate and severe CHD is associated with increased perioperative mortality. To ensure optimal management of CHD patients undergoing non-cardiac surgery, preoperative risk assessment is pivotal, along with a multidisciplinary approach and collaboration across hospitals. The objective of this review is to provide a simple model to identify CHD patients at risk prior to non-cardiac surgery.