Export terminology updated: RBI permitted rupee receipts recognised and refund return due date linked to return filing. Section 54 is amended: sub section (8)(a) replaces 'zero rated supplies' with 'export' and 'exports'; the Explanation to clause (2) adds that consideration may be received 'in Indian rupees wherever permitted by the Reserve Bank of India' alongside foreign exchange; and sub clause (e) is substituted to state that refund of unutilised input tax credit under clause (ii) of the first proviso to section 54(3) is tied to the due date for furnishing the return under section 39 for the period in which the refund claim arises.