Commencement of Amendment Rules: specified GST amendment rules appointed to commence earlier than notification's effective date. Commencement of specified provisions of the Goa Goods and Services Tax (Fourth Amendment) Rules, 2019 is effected by executive appointment: the Government designates an operative date for rules 10, 11, 12 and 26 of the Fourth Amendment Rules, while separately stating the effective date of the notification itself; the instrument is issued in the name of the Governor by the State finance department.