Financial control is one of the strategic functions in financial management that plays a crucial role in maintaining organizational performance and sustainability amid increasingly complex business dynamics. Financial control functions not only as a monitoring tool but also as a mechanism to ensure that financial planning, budgeting, and the utilization of financial resources are carried out effectively and efficiently. It enables management to compare planned targets with actual outcomes so that deviations can be promptly identified and corrected. This article aims to examine the role of financial control as a strategic instrument in sustaining corporate performance and supporting long-term business sustainability. The research employs a qualitative approach through a literature review by analyzing financial management textbooks, national and international scholarly journals, and publications related to budgeting and financial control. The findings indicate that financial control integrated with the budgeting system enhances cost efficiency, improves cash flow management, and supports strategic managerial decision-making. Furthermore, effective financial control contributes to corporate financial stability, which serves as a primary prerequisite for sustainability. Therefore, financial control not only affects the achievement of short-term financial performance but also plays a significant role in ensuring the long-term continuity of the company.