On 1 July 2017, India put into effect its national goods and service tax (GST) regime, which had been first proposed as early as 2000 with an initial roll-out date of 1 April 2010. The significant delay in the implementation is due to the complexity of overhauling a previously fragmented indirect tax system by unifying it into a single USD 2 trillion market catering to 1.3 billion consumers. In this article, the author discusses the input tax mechanism under the newly adopted GST framework and highlights some pitfalls.