Goods and Services Tax (GST) is a unified tax structure that replaced the multiple central and state-level taxes in India. With its customer-centred approach, the new system is capable of reducing complexities, imparting uniformity, enhancing tax compliance and facilitating the free movement of goods and services throughout the country. The present research paper is mainly focused on highlighting the GST structure, revenue collection in the post-GST regime, interstate variations in tax collection and comparison of pre and post-GST contributions to GDP. Hurdles in the effective implementation of the system are also elaborated. Data revealed a continuous increase in revenue mobilisation through GST, but with significant interstate variations. The share of both the central and state governments from subsumed taxes reduced in post GST time period. The compliance burden faced by micro and small enterprises, revenue shortfall of states, problems associated with digital infrastructure and GST system complexities should be resolved to realise the full potential of the taxation reforms.