The process of registration for the Goods and Services' Tax (GST) will begin from 25 June 2017. The registrations will be open for a period of three months. Those who have not registered can avail of the facility on GSTN. The provisional I.D. of businesses is their GSTN. Those traders who have already obtained A.R.N. can download the Provisional Registration Certificate from the website. The citizens who have filed incomplete forms can also avail of the facility after 27 June on GST Portal. New businesses which are not registered in the current tax regime can also get registered after 25 June 2017 on GST Portal.