Every month between the 14th and the 20th, finance teams match their internal purchase registers against Form GSTR-2B. A supplier may reassure you that they filed their return on time, yet their invoice remains completely absent from your statement. In other cases, the tax numbers differ, or the portal shows the entry in an amendment table. Understanding how supplier filings populate your inward tax credits lets you isolate root causes quickly and prompt vendors for timely corrections.
How supplier GSTR-1 filings populate your GSTR-2B
Form GSTR-2B is a static monthly auto-drafted statement generated for every regular recipient. The statutory entitlement to input tax credit is governed by Section 16(2)(aa) of the CGST Act. It specifies that credit is available only when the supplier furnishes invoice details in their statement of outward supplies and communicates them to the recipient. Rule 36(4) of the CGST Rules reinforces that no provisional credit can be claimed beyond the documents reflected in Form GSTR-2B.
The GST portal generates Form GSTR-2B on the 14th of every month. The statement aggregates all outward documents submitted by your vendors up to specific calendar deadlines:
- Monthly filers: Outward supplies submitted in Form GSTR-1 between the 12th of the previous month and the 11th of the current month.
- Quarterly filers (QRMP scheme): Invoices submitted using the Invoice Furnishing Facility (IFF) between the 14th of the previous month and the 13th of the current month.
Documents filed after these cut-off dates are not discarded. Instead, they roll forward into your GSTR-2B for the subsequent tax period. For an overview of how outward liabilities connect to overall filing, see our guide on GSTR-1 vs GSTR-3B differences and liabilities.
Common causes of GSTR-1 vs GSTR-2B mismatches
Discrepancies between what you expect from vendor bills and what appears in your GSTR-2B arise from systematic reporting errors or timing gaps. The most frequent causes include:
1. Filing after the cut-off date
According to the GSTN GSTR-1 user manual, the due date for monthly filers is the 11th of the succeeding month. For quarterly filers using the IFF, Rule 59(2) sets the cut-off as the 13th of the month. If a vendor files on the 12th or 14th, the portal accepts the return, but the invoices are excluded from your current month's GSTR-2B. They will appear only in the next month's statement.
2. Wrong buyer GSTIN entered by supplier
Suppliers operating manual accounting entries occasionally mistype a state code or digit in the recipient GSTIN. When this happens, the supplier successfully files Form GSTR-1, but the tax credit flows to another entity's GSTR-2B. Your statement receives nothing.
3. Supply uploaded as B2C instead of B2B
Suppliers filing summary outward returns may mistakenly bucket your business invoice into Table 7 (B2C Others) or Table 5 (B2C Large). B2C tables do not record individual recipient GSTIN numbers. Consequently, no credit is ever communicated to your GSTR-2B.
4. Invoice saved but not filed
A vendor may draft invoices in their GSTR-1 dashboard and assume the process is complete. Under GST portal mechanics, saved invoices do not populate the recipient's GSTR-2B until the vendor completes the final verification via DSC or EVC.
5. Invoices amended in Table 9A
When a supplier amends invoice values, invoice numbers, or dates from earlier months in Table 9A of Form GSTR-1, the record appears in the B2BA section of your GSTR-2B rather than the standard B2B table. An automated lookup searching purely for the original invoice number will report a mismatch unless amendment tables are examined.
6. Mismatched credit notes in Table 9B
Discrepancies also occur when vendors report credit notes under Table 9B (CDNR) without linking the original invoice details correctly, or when credit notes are filed in a different tax period than your internal debit notes.
Common mistake: Claiming ITC in Form GSTR-3B based purely on supplier tax invoices or email confirmations when the data is absent from GSTR-2B. This triggers an automated mismatch intimation in Form DRC-01C under Rule 88D.
Worked example: identifying four invoice discrepancies
Consider an engineering firm in Pune matching its September 2026 purchase register against its GSTR-2B generated on 14 October 2026. The purchase register contains four vendor invoices totaling ₹2,35,000 in input tax credit.
| Invoice | Supplier | Books ITC | GSTR-2B ITC | Status and root cause |
|---|---|---|---|---|
| INV-801 | Alpha Steels | ₹90,000 | ₹90,000 | Matched (Filed on 10 Oct) |
| INV-802 | Beta Logistics | ₹45,000 | ₹0 | Missing: Filed late on 12 Oct (Rolled to Oct 2B) |
| INV-803 | Gamma Tools | ₹65,000 | ₹0 | Missing: Vendor entered wrong GSTIN |
| INV-804 | Delta Polymers | ₹35,000 | ₹25,000 | Value mismatch: Original ₹25,000 in 2B; Table 9A pending |
| Total | ₹2,35,000 | ₹1,15,000 | Eligible ITC: ₹1,15,000 |
The arithmetic breakdown:
- Books total input credit: ₹90,000 + ₹45,000 + ₹65,000 + ₹35,000 = ₹2,35,000.
- GSTR-2B eligible credit available: ₹90,000 + ₹0 + ₹0 + ₹25,000 = ₹1,15,000.
- Blocked or deferred credit: ₹2,35,000 − ₹1,15,000 = ₹1,20,000.
If the firm claims the entire ₹2,35,000 in Table 4(A)(5) of Form GSTR-3B, its claim will exceed Form GSTR-2B by ₹1,20,000. Under Rule 88D, this difference flags an automated DRC-01C notice. To stay compliant, the accountant claims only ₹1,15,000 in September GSTR-3B and follows up with vendors for the remaining ₹1,20,000.
Step-by-step investigation and resolution workflow
Follow this checklist to trace and resolve missing invoices before the 20th of the month:
- Check supplier filing status on the GST portal: Navigate to Search Taxpayer → Search by GSTIN → Return Filing Table. Verify whether the vendor filed Form GSTR-1 for the relevant tax period and record the filing date.
- Check the filing timestamp: If the supplier filed after the 11th (or after the 13th for IFF), the invoice will arrive in next month's GSTR-2B. Keep the credit on your internal hold ledger.
- Inspect GSTR-2B B2BA and CDNR tables: Open the downloaded GSTR-2B Excel spreadsheet. Check the B2BA tab to confirm whether the vendor amended the invoice number or date.
- Examine Invoice Management System (IMS) records: On the GST portal, check the IMS Dashboard. Ensure records are not mistakenly flagged as Rejected or kept Pending, which excludes them from Form GSTR-2B.
- Issue corrective notices to suppliers: When errors involve wrong GSTINs or B2C classification, request immediate amendments in the supplier's next Form GSTR-1 or through Form GSTR-1A.
To understand the mechanics of how GSTR-2B populates your final tax liabilities, read our detailed guide on how GSTR-2B feeds Form GSTR-3B.
Sample vendor communication template
Use this notice to inform suppliers when invoices fail to appear in your monthly GSTR-2B:
Notice risk: Claiming unreflected input tax credit in excess of Form GSTR-2B exposes your business to scrutiny under Rule 88D. Learn how to respond if you receive an intimation in our guide on replying to Form DRC-01C mismatch notices.
Related guides
- GSTR-2B reconciliation: complete guide to ITC matching
- GSTR-2B tax amount mismatch: why the tax differs and how to fix it
- GSTR-2B Table 4D mismatch: unmatched invoices and fixes
- GSTR-2B not generated or not showing: what to check and what to do
- How accountants can automate GSTR-2B reconciliation
- Invoices in GSTR-2B but not in my books: how to investigate them
Frequently asked questions
Why is a supplier's filed invoice missing from my GSTR-2B this month?
The most frequent reason is the filing date. If a monthly supplier files Form GSTR-1 after the cut-off date of the 11th, or a QRMP supplier submits via IFF after the 13th, the invoice rolls over to your next month's GSTR-2B. Other frequent causes include entering an incorrect GSTIN, reporting the invoice under B2C instead of B2B, or saving the invoice without completing final return submission.
Can I claim input tax credit if the supplier filed GSTR-1 late?
Under Section 16(2)(aa) of the CGST Act and Rule 36(4), credit is restricted to invoices that appear in your generated Form GSTR-2B. If the supplier files past the cut-off, the credit does not appear in your current statement. You must defer the claim to the subsequent tax period once the document arrives in your GSTR-2B.
How do amendments in Table 9A of GSTR-1 reflect in GSTR-2B?
When a supplier amends an earlier invoice in Table 9A of Form GSTR-1, the amended record appears in the B2BA table of your GSTR-2B. The portal updates the differential value and tax liability for the tax period in which the amendment return is filed.
What should a buyer do if an invoice is wrongly reported under B2C?
If a supplier mistakenly reports your purchase as a B2C sale, it will never enter your GSTR-2B. You must instruct the vendor to file an amendment in Table 9 of Form GSTR-1, converting the B2C transaction into a B2B supply with your valid GSTIN.
Reconcile your GSTR-2B in seconds
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Last checked: 14 October 2026. Sources: CBIC CGST Act Section 16, GSTN GSTR-1 User Manual, GSTN GSTR-3B User Manual.