Sir,
According to sub-rule (5) of Rule 89 of CGST Rules, 2017 "in the case of refund on account of inverted duty structure, refund of input tax credit shall be granted as per the following formula -
Maximum Refund Amount = {(Turnover of inverted rated supply of goods) x Net ITC ÷ Adjusted Total Turnover} - tax
payable on such inverted rated supply of goods
Explanation.- For the purposes of this sub rule, the expressions “Net ITC” and “Adjusted Total turnover” shall have the same meanings as assigned to them in sub-rule (4).
According to sub-rule (4) (B) of rule 89 of CGST Rules, 2017 ""Net ITC" means input tax credit availed on inputs and input services during the relevant period."
According to the same rule (89 (4) (E)) "Adjusted Total turnover" means the turnover in a State or a Union territory, as defined under clause (112) of section 2, excluding the value of exempt supplies other than zero-rated supplies, during the relevant period;