16 September 2025
GST portal rules state: “No inter-head adjustment is allowed for major heads” and “No minor head adjustment is allowed,” confirming that cross-utilization between IGST, CGST, and SGST for interest payments is strictly not permitted. If excess IGST interest has been paid, it will remain in the electronic cash ledger as a balance under the IGST-interest minor head and can only be used for future IGST-interest payments—not for any CGST/SGST interest or other liability.