The new SST Act would be tabled to the cabinet on 27 July and to the parliament on 07 Aug. The threshold is $500,000 per year and the Service Tax rate is 6% . Once gazetted the SST implementation will be eff. 01 Sep 2018. All outstanding GSTs are to be settled by 2020. Service charge is subject to Service Tax as per GST previously.
Please refer to the Customs portal
What Is SST