Govt. notifies Central Goods and Services Tax (Fourth Amendment) Rules 2017, inter alia amends Rule 24 w.e.f. July 22 to allow cancellation of GST registration of migrated tax-payers by September 30th; Amends Rule 34 to prescribe rate of exchange as notified by CBEC u/s 14 of Customs Act for determination of value of taxable goods, while rate of exchange for taxable services shall be that determined as per generally accepted accounting principles; Amount for reversal of ITC in respect of inputs or capital goods in stock, where persons opts for composition scheme / supplies exempt goods or services / whose registration has been cancelled, shall be calculated separately for central tax, State tax, Union territory tax and integrated tax, in terms of Rule 44 w.e.f July 1; Amends third proviso to Rule 46 to provide endorsement of supplies to SEZ unit / developer on the invoice, while also amending Forms GST TRAN-1 & TRAN-2 to provide for “applicable HSN Codes”; Further amends Rule 61 to provide for e-filing of Form GSTR-3B, and where said Return is furnished after the due date for furnishing details in Form GSTR-2 (inward supplies) – (a) Part A of Form GSTR-3 shall be generated electronically on the basis of Forms GSTR-1, GSTR-2 and other liabilities of preceding tax periods, while Part B thereof, on the basis of return in Form GSTR-3B, (b) Part B of Form GSTR-3 can be modified based on discrepancies if any, between Form GSTR-3B and GSTR-3 and accordingly tax liabilities shall be discharged, (c) where ITC amount in Form GSTR-3 exceeds that in Form GSTR-3B, the additional amount shall be credited to electronic credit ledger : CBEC Notification