Design thinking as a subject has grown enormously in theoretical content over the past 50 years. However, both design thinkers and policymakers have not come closer to developing design thinking in policymaking. Recognising this research gap, a prototype called the basic resource gap model has been designed as a supplement to the extant fiscal rule, with fiscal deficit as its target. The study highlights both the potential applicability of the design-thinking approach to the process and specifies an application that can supplement the extant fiscal rule and potentially enhance fiscal management.