Conceptual foundations of budgetary policy transformation in the context of ensuring sustainable development of territorial communities

Introduction. In the context of global crises, military aggression, and decentralization reforms, the transformation of budgetary policy has become a key factor in ensuring the sustainable development of territorial communities in Ukraine. Particular importance is attached to enhancing the adaptability, transparency, and strategic orientation of public finance systems under security and climate challenges. The purpose of the paper is to substantiate the conceptual foundations of budgetary policy transformation, taking into account fiscal decentralization, digitalization, green economy priorities, and the need for financial resilience of territorial communities. Results. The paper systematizes theoretical approaches to understanding the essence and structure of budgetary policy based on classical and modern financial theories. A conceptual model of budget policy is developed, including key structural components: methodological basis, principles, institutional architecture, information infrastructure, and implementation tools. The authors highlight six modernization vectors: institutional-regulatory, financial, managerial, socio-economic, environmental, and security-oriented. Particular attention is paid to digital solutions, open financial data, participatory budgeting, and the integration of environmental indicators into local budget planning. Conclusions. A comprehensive transformation of budgetary policy at the local level, aligned with strategic priorities of sustainable development, will strengthen fiscal autonomy, improve financial governance, and enhance the long-term resilience of territorial communities.