Practicing CA
1180 Points
Joined May 2017
If you have made the payment of CGST instead of IGST, then the cash balance of CGST cannot be adjusted against the IGST. The only solution for this problem is that you can carry forward it and adjust agianst the next months liability or claim the refund of CGST later on but now you have to remit IGST.
You have to pay interest @ 18% on the amount of IGST liability for the no. of days of delay.