If you've incorrectly charged CGST/SGST instead of IGST on an invoice and already filed your GSTR-1, you can amend the invoice and update your GST return. The deadline for amendments is typically November 30, 2026, or before filing your annual return for the relevant financial year. Ensure you pay the correct IGST liability and claim a refund for the wrongly paid CGST/SGST. This correction will update the recipient's GSTR-2A and impact their Input Tax Credit.
18 October 2025
To correct the GST for the August 2025 invoice where CGST/SGST was charged instead of IGST—and GSTR-1 was already filed—you need to amend the invoice and update the GSTR-1 return as per GST law. Amendments are allowed until November 30, 2026, or before filing the annual return for FY 2025-26, whichever is earlier.
18 October 2025
Make sure to pay the IGST liability for the corrected invoice and adjust the wrongly paid CGST+SGST accordingly. You can claim a refund for the CGST/SGST paid.
Corrections in GSTR-1 will flow to the recipient’s GSTR-2A and impact the Input Tax Credit if applicable.
No interest or penalty applies if you pay the correct tax under genuine mistake, as per current GST Council guidelines.