Refund of unutilised input tax credit: amended formula applies to later applications; restrictions on specified goods apply prospectively. The amendment to the formula in sub rule (5) of rule 89 of the UPGST Rules for refund of unutilised input tax credit under inverted duty structure is prospective and applies only to refund applications filed on or after its effective date; applications filed before that date are to be dealt with under the pre amendment formula. Separately, the notification restricting refunds for specified goods under chapters 15 and 27 is also prospective and applies only to refund applications filed on or after its effective date.