Goa GST: State tax rates and implementation rules notified, including schedules, transitional credit and HSN invoice requirements. Notification under the Goa GST Act, 2017 notifies State GST rates of 2.5%, 6%, 9%, 14%, 1.5% and 0.125% for intra State supplies of goods as listed in Schedules I-VI by tariff classification; it appoints 1 July 2017 for commencement of specified Act provisions, prescribes transitional credit/stock reporting forms and procedures, fixes interest rates for specified provisions, notifies electronic document verification modes, and requires invoice HSN disclosure thresholds tied to prior year turnover.