The GST required agreement between states, the centre, and industry groups which took a lot of time. Multiple drafts were floated around and the provisions tweaked after collecting feedback from the public. Finally, the GST council was formed along with the passing of the constitution amendment bill in September 2016, explained KPMG’s Parkhi. Once the council began vetting the law, “there were certain issues that the states, centre, and even industry groups had. That is why it took three months to come to a consensus,” Parkhi added.