This circular clarified the charging of interest under section 50(3) of the CGST Act, 2017, in cases of wrongly availed IGST credit and its reversal. The CBIC emphasized the role of rule 88B of the CGST Rules in the calculation of interest, including all heads of IGST, CGST, and SGST. However, the credit of compensation cess cannot be used for the calculation of interest.