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A junior accountant finds two entries in GSTR-2B that look like the same supplier invoice and does not know whether to claim the credit on both.
Duplicates arise from reporting in two periods, original plus amendment, or two slightly different invoice numbers. The same GSTIN, value and date with a different number or period is the tell; credit is claimed once.
A duplicate check that groups GSTR-2B rows by supplier GSTIN and taxable value, flags pairs within a short date range, and checks the B2BA amendments section against originals.
Each duplicate pair is resolved to one claim, the extra entry is rejected or left unclaimed, and the supplier is asked to correct GSTR-1.
The same invoice can reach your GSTR-2B twice when a supplier reports it in two periods, as an original and an amendment, or under two slightly different invoice numbers. Whatever the reason, you are entitled to the credit only once. Spot the pair, claim one, and ask the supplier to correct their return.
What are the likely causes?
| Duplicate pattern | How to recognise it | Who corrects it | Risk if you claim both |
|---|---|---|---|
| Reported in two months | Same GSTIN, number and value, in this month and last month | Supplier, by amending GSTR-1 | Double credit |
| Original plus amendment | One row in B2B, one in B2BA | No one; amendment replaces original | Double credit if you add them |
| Number typed two ways | Same GSTIN, value and date; numbers like 1045 and 01045 | Supplier | Double credit |
| Uploaded twice by mistake | Identical rows, sometimes different invoice dates | Supplier | Double credit |
| Genuine second invoice | Same value, but a separate delivery and purchase order | Not a duplicate | None; claim both |
What happens if I claim the ITC on both entries?
You have taken the same credit twice. Under Section 16 of the CGST Act, 2017, credit is allowed on each genuine supply, not on each row. If the extra credit is used to pay tax, interest under Section 50(3) applies at 18 percent a year until you reverse it. The department’s systems also compare GSTR-3B claims with GSTR-2B and purchase data, so a double claim can draw a notice.
How do I tell a real second invoice from a duplicate?
- Look at the purchase order and goods receipt note. Two deliveries mean two invoices.
- Compare dates. A duplicate usually has the same invoice date, or dates a few days apart.
- Check the B2BA section. If one entry is an amendment, it replaces the original.
- Ask the supplier. A short email settles it, and it gives you a record.
Since October 2024, the Invoice Management System (IMS) lets you reject an invoice before GSTR-2B is generated on the 14th. Reject the duplicate there if it is still open.
Worked example
GSTR-2B for July shows two entries from the same Ahmedabad supplier: invoice 1045 and invoice 01045, each for ₹59,000 (₹50,000 taxable plus GST at 18 percent of ₹9,000), both dated 12 July. The goods receipt shows one delivery.
The accountant had claimed ITC on both, a total of ₹18,000.
| Line | Amount |
|---|---|
| ITC claimed on both rows | ₹18,000 |
| Correct ITC for one invoice | ₹9,000 |
| Excess to reverse | ₹9,000 |
Check: ₹9,000 + ₹9,000 = ₹18,000, and ₹18,000 minus ₹9,000 = ₹9,000. The ₹9,000 is reversed in the next GSTR-3B Table 4B, with interest if it had been used. The accountant also asks the supplier to remove invoice 01045 from their GSTR-1.
What to read next
- Next in this series: GSTR-2B vs purchase register reconciliation
- Handling the flagged items: exception management in reconciliation
- Earlier in this series: Why won’t my invoices match register vs GSTR-2B?
- Matching at volume: GST reconciliation software
Inward GST matching (GSTR-2A, GSTR-2B, ITC and IMS) is on the TransactIG roadmap.
Content authored by practitioners with experience at Amazon India, Intuit QuickBooks, and the Tata Group. Meet the team →