Hello Sir,
Section 77 of the CGST Act provides for the adjustment of taxes paid incorrectly. Where a registered person has considered a transaction to be an intra-State supply and paid CGST and SGST/UTGST, but it is subsequently held to be an inter-State supply and IGST is liable to be paid, the registered person, is required to pay IGST on such transaction. The registered person is entitled to claim refund of CGST and SGST/UTGST paid on the transaction.
In such situations interest is not payable by virtue of Section 77(2) of the CGST Act and 19(2) of the IGST Act, 2017.
Similarly, where the registered person has considered a transaction to be an inter- State supply and paid CGST and SGST/UTGST, but it is subsequently held to be an intra-State supply and CGST and SGST/UTGST is liable to be paid, the registered person is required to pay the applicable CGST and SGST/UTGST on such transaction.
In this situation also, it is to be noted that interest is not liable to be paid when the correct tax is paid.