Introduction
If you are a CA, tax professional, or finance team member handling GST compliance, GSTR-2B reconciliation with your Purchase Register is no longer optional but it is a legal requirement under the GST law.
With effect from 1st January 2022, as per Section 16(2)(aa) of the CGST Act 2017 (notified vide CBIC Notification No. 39/2021-Central Tax dated 21st December 2021), Input Tax Credit on any invoice or debit note can be claimed only when the details of such invoice have been furnished by the supplier in their GSTR-1 and communicated to the recipient through GSTR-2B.
This means if an invoice does not appear in your GSTR-2B, you legally cannot claim ITC on it. no matter what your purchase register says.
This guide covers the complete step-by-step process to reconcile GSTR-2B with your Purchase Register for FY 2025-26, including the latest amendments.
What is GSTR-2B?
GSTR-2B is an auto-generated, static ITC statement issued by the GST portal every month. It consolidates data from your suppliers’ GSTR-1 and GSTR-5 filings to show exactly how much ITC is available to you for a given tax period. Unlike GSTR-2A, which is dynamic and updates whenever a supplier amends their filing, GSTR-2B is locked on the 14th of every month for the previous tax period.
GSTR-2B vs GSTR-2A — Key Difference
| Feature | GSTR-2A | GSTR-2B |
|---|---|---|
| Nature | Dynamic — updates in real time | Static — locked on 14th of each month |
| Legal basis for ITC | No (since Jan 2022) | Yes — under Section 16(2)(aa) |
| Used for GSTR-9 | Replaced by GSTR-2B from FY 2023-24 | ✅ Mandatory |
| Provisional ITC | Was allowed | Not allowed |
Latest Amendment: GSTR-2B Now Mandatory for GSTR-9 Too
CBIC issued Notification No. 20/2024 – Central Tax dated 8th October 2024, mandating that ITC reconciliation in Form GSTR-9 must now be done with GSTR-2B instead of GSTR-2A. This is effective from November 1, 2024 and applies from FY 2023-24 onwards.
This is a significant change, your annual return reconciliation in Table 8A of GSTR-9 now auto-populates from GSTR-2B, not GSTR-2A.
Why Reconcile GSTR-2B with Purchase Register?
- Legal compliance — Section 16(2)(aa) makes it mandatory
- Avoid GST notices — The GSTN system automatically compares your GSTR-3B ITC claims with GSTR-2B and issues ASMT-10 scrutiny notices for significant differences.
- Prevent ITC loss — Unclaimed ITC has a time limit under Section 16(4)
- Accurate GSTR-9 filing — Table 8A now auto-populates from GSTR-2B
Step-by-Step GSTR-2B Reconciliation Process
Step 1 — Download GSTR-2B
- Log in to gst.gov.in
- Go to Services → Returns → GSTR-2B
- Download after the 14th of each month for the previous period
- Download in Excel format for easy reconciliation
The GSTR-2B Excel file contains multiple sheets: B2B (regular purchases), B2BA (amendments), CDNR (credit notes), ISD (Input Service Distributor), RCM (Reverse Charge), and Import data. Each sheet must be handled separately during reconciliation.
Step 2 — Prepare Your Purchase Register
Your Purchase Register must contain at minimum:
- Supplier GSTIN
- Invoice Number
- Invoice Date
- Taxable Amount
- IGST, CGST, SGST amounts
- Total Tax
Before matching, standardise the data: remove spaces from GSTINs, convert invoice numbers to uppercase, and ensure dates are in a consistent format.
Step 3 — Match Invoices
Compare each invoice in your Purchase Register against GSTR-2B line by line. Categorise each invoice as:
- ✅ Matched — Invoice in Purchase Register = Invoice in GSTR-2B (GSTIN, invoice no., amount all match)
- ❌ In PR, not in GSTR-2B — Supplier has not filed GSTR-1 yet
- ⚠️ In GSTR-2B, not in PR — Invoice missing from your books
- 🔄 Amount mismatch — Invoice exists in both but amounts differ
Step 4 — Handle Mismatches
Invoice in PR but not in GSTR-2B:
- Follow up with supplier to file their GSTR-1
- Do NOT claim ITC until it appears in GSTR-2B
- Under Rule 36(4), you can claim only 100% of the ITC appearing in GSTR-2B for B2B invoices. Provisional credits are no longer allowed as of FY 2022-23 onwards.
Amount mismatch:
- Verify the original invoice copy
- If the portal amount is incorrect, the supplier must file an amendment in GSTR-1A.
Supplier’s GST registration cancelled:
- If a supplier’s GST registration is cancelled retrospectively, any ITC claimed on their invoices can be reversed by the department. Always verify supplier registration status on the GST portal before making large payments.
Step 5 — Claim ITC in GSTR-3B
File your GSTR-3B with only the matched, eligible ITC. Do not claim ITC on unmatched invoices.
Step 6 — Maintain a Monthly Reconciliation Register
Maintain a monthly reconciliation register with columns for: Reporting Period, Total PR ITC, Total GSTR-2B ITC, Matched ITC, Unmatched ITC, Ineligible ITC (Section 17(5)), and Net Eligible ITC Claimed.
ITC Time Limit — Critical Deadline
Under Section 16(4) of the CGST Act, ITC must be claimed by the earlier of: (a) due date of GSTR-3B for October of the subsequent year, or (b) date of filing GSTR-9. For FY 2024-25, this means 30th November 2025.
Any ITC not claimed by this deadline is permanently lost.
ISD — Important Change from FY 2024-25
From FY 2024-25, ISD (Input Service Distributor) is mandatory for distributing common input services across GSTINs. ITC distributed through ISD appears in a separate section of GSTR-2B.
GSTR-9 Impact — FY 2024-25 Changes
Table 8A has been updated and now automatically includes invoices for FY 2024-25, even if they appear later in GSTR-2B between April–October 2025.
Additionally, FY 2023-24 invoices shown in FY 2024-25 GSTR-2B will not be included in the FY 2024-25 Table 8A — so you must maintain separate reconciliations for both FY 2023-24 and FY 2024-25 to avoid mismatches.
Record Keeping
The GST Act requires you to maintain records for at least 72 months (6 years) from the last date of filing the relevant annual return.
Common Mistakes to Avoid
- Claiming ITC on invoices not in GSTR-2B
- Not following up with non-compliant vendors
- Doing reconciliation only at year-end instead of monthly
- Missing the Section 16(4) deadline
- Not checking supplier registration status before large payments
- Ignoring ISD distribution from FY 2024-25
Conclusion
GSTR-2B reconciliation with your Purchase Register is the most critical monthly GST compliance activity for any business. With Section 16(2)(aa) in force since January 2022 and GSTR-2B now mandatory for GSTR-9 from FY 2023-24 onwards, there is no room for shortcuts.
Do it monthly, maintain your reconciliation register, follow up with vendors promptly, and claim only matched ITC in GSTR-3B.
Use MilaoGST’s free reconciliation tool to match your Purchase Register with GSTR-2B in minutes — no Excel formulas needed.
Legal References:
- Section 16(2)(aa), CGST Act 2017
- CBIC Notification No. 39/2021-Central Tax dated 21.12.2021
- CBIC Notification No. 20/2024-Central Tax dated 08.10.2024
- Rule 36(4), CGST Rules 2017
- Section 16(4), CGST Act 2017