If you've filed your GSTR 1 and realised there's an error, you can rectify it by filing GSTR 1A for the same tax period. This must be done after submitting GSTR 1 but before submitting GSTR 3B. GSTR 1A allows you to update, add, or modify invoice details and correct missing records, though GSTIN changes need to be handled in the subsequent GSTR 1 filing.
12 September 2025
Any registered taxpayer who has filed GSTR-1 and notices a discrepancy or error can correct it by filing GSTR-1A for the same period. GSTR-1A can be filed after submitting GSTR-1 but only before submitting GSTR-3B of the same tax period. You can update, add, or modify invoice details; correct typographical errors; and address missing records. However, you cannot correct GSTINs—those changes must be made in the next period’s GSTR-1.