During his rule, Jalaluddin Firoz Khalji introduced the ‘Diwan-i-Waquf’, a specialized department dedicated to managing state expenditure, particularly focusing on waqf or religious endowments. This department ensured proper supervision and administration of charitable trusts and revenues, which enhanced the efficiency and accountability of financial affairs in the Sultanate. Jalaluddin’s establishment of Diwan-i-Waquf marked an important step in the administrative evolution of the Delhi Sultanate, reflecting his efforts to systematize governance and control fiscal matters related to state expenses and religious institutions.