6. CONCLUSION The GST rate rationalization effective September 22, 2025, represents the most significant structural reform of India's indirect tax system since the initial GST implementation in July 2017. The simplification from a four-tier to a two-tier structure with merit and standard rates (excluding special rates for gold, diamonds, and demerit goods) promises long-term administrative efficiency and reduced classification disputes. However, the transition creates immediate challenges for businesses spanning multiple dimensions: accurate rate application during the transition period based on complex time of supply rules; mandatory ITC reversal for goods and services becoming exempt; MRP revision and communication to ensure consumer benefit pass-through; and comprehensive cost-benefit analysis for business model optimization in sectors facing ITC denial. From the perspective of business and industry, three imperatives emerge clearly: .......