The paper attempts to delve into the paradigm shift in the taxation framework of India under Goods and Services Tax (GST), comparing pre GST with post-GST. Indeed, it is a tax that was introduced on 1 July 2017, designed to make such a complex and fragmented system of taxes rather more harmonized and unified under a single tax regime. This paper analyses the economic, administrative, and compliance implications of this revolutionary tax reform. The paper highlights its critical need for reform by way of a review of pre GST taxation challenges, inefficiencies, and interstate trade barriers. In the analysis, it addresses the GST impact on tax revenue, ease of doing business, and economic growth. The key benefits that contributed from quantitative data and qualitative assessments based on these factors include more transparency, lower tax evasion, and increased efficiency in tax collection. It nonetheless recognizes challenges like tough initial implementation and sector-specific impacts. The paper concludes that although GST has been a paramount step toward an efficient and single tax system in India, improvements will have to be affected continuously and the concerns of the stakeholders concerned addressed if its full potential is to be realized.