GSTR-1A: correcting GSTR-1 before GSTR-3B
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Updated 03 Oct 2026
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AI summary
An optional return to fix or add to GSTR-1 for the same tax period.
4 sections
What it is
An optional form, available from July 2024, that lets you amend or add records reported in GSTR-1 for a tax period — after filing GSTR-1 and before filing GSTR-3B for that period.
Why it matters
GSTR-3B's outward liability is auto-filled from GSTR-1/1A, and from July 2025 that auto-filled liability can't be edited in GSTR-3B. GSTR-1A is where you fix it.
What you can do
- Add invoices missed in GSTR-1.
- Correct GSTIN, place of supply, value or rate on reported invoices.
- Changes flow to the buyer's GSTR-2B of the next period.
When GSTR-1A is too late
If GSTR-3B for that period is filed, use the amendment tables in a later GSTR-1, or issue a credit/debit note.
Sources
PreviousGSTR-1: statement of outward supplies Next in GST Returns GSTR-3B: monthly summary return and tax payment
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