What is the 14-day cut-off and why does it matter?

GSTR-2B is generated on the 14th of every month and captures invoices uploaded by suppliers up to the 13th. Invoices uploaded by suppliers after the 13th of the month appear only in the next month's GSTR-2B, deferring the recipient's ITC eligibility by one tax period. The 14-day cut-off creates a forcing function for the recipient to follow up with suppliers and obtain timely GSTR-1 filings.

What is GSTR-1A and how does it correct mismatches?

GSTR-1A is the supplier-side amendment return introduced in 2024 that allows a supplier to amend or add invoices in the same tax period before the filing of GSTR-3B. Where the recipient identifies that an invoice is missing or incorrectly captured in GSTR-2B, the supplier can use GSTR-1A to fix the position within the same period and avoid an ITC denial. The GSTR-1A amendment flows into the recipient's GSTR-2B before the GSTR-3B due date.

How does Rule 36(4) of the CGST Rules restrict ITC?

Rule 36(4) of the CGST Rules restricts the recipient from claiming ITC on invoices that have not been uploaded by the supplier in GSTR-1 and reflected in GSTR-2B. Previously the rule permitted a provisional ITC of 5 percent above the GSTR-2B amount, but this provisional ITC was withdrawn from 1 January 2022. From that date the recipient can claim ITC only to the extent reflected in GSTR-2B.

What is the recommended GSTR-2B reconciliation cycle?

KAMRIT recommends a four-step monthly reconciliation cycle. First, download the GSTR-2B on the 14th and import into the reconciliation tool. Second, match the GSTR-2B against the purchase register and identify missing invoices, mismatched amounts, and reverse-charge invoices. Third, follow up with non-compliant suppliers and request GSTR-1A amendments before the 20th. Fourth, finalise the eligible ITC and file GSTR-3B by the 20th of the month with the reconciled ITC figure.

GSTR-2B Reconciliation and ITC Mismatch: The 2B versus 2A Distinction, the 14-Day Cut-off, and the GSTR-1A Amendment Route Every GST Filer Must Run

Q: What is the difference between GSTR-2A and GSTR-2B?

GSTR-2A is a dynamic auto-populated statement that reflects every invoice uploaded by suppliers in their GSTR-1 in real time. It updates continuously as suppliers file or amend. GSTR-2B is a static monthly statement generated on the 14th of every month showing invoices uploaded by suppliers up to the 13th of the same month for the preceding tax period. ITC eligibility under Section 16(2)(aa) of the CGST Act is determined with reference to GSTR-2B, not GSTR-2A.

Abstract

The introduction of GSTR-2B in August 2020 and the subsequent statutory codification of GSTR-2B as the basis of input tax credit eligibility under Section 16(2)(aa) of the CGST Act have transformed the GST reconciliation discipline in India. GSTR-2B is a static, monthly, auto-drafted statement of inward supplies generated on the 14th of every month for the preceding tax period. The recipient can claim ITC only to the extent reflected in GSTR-2B, and the withdrawal of the Rule 36(4) provisional ITC from 1 January 2022 has removed the safety net. This article walks through the GSTR-2A versus GSTR-2B distinction, the 14-day cut-off mechanic, the Rule 36(4) restriction, the GSTR-1A amendment route, and the four-step monthly reconciliation workflow that every GST filer must run to prevent ITC leakage.

Introduction

When GST was introduced in July 2017, the original architecture contemplated a real-time matching of supplier and recipient invoices through GSTR-1, GSTR-2, and GSTR-3 in a single tax period. The mechanism was operationally unwieldy and was deferred indefinitely. In its place, the GST Council and the CBIC have built an alternative architecture centred on GSTR-2B, the auto-drafted ITC statement.

GSTR-2B was launched in August 2020 as an information statement. It evolved into the statutory basis for ITC eligibility through the Finance Act, 2021 amendment to Section 16(2) introducing clause (aa). From January 2022, the recipient's right to claim ITC is conditional on the corresponding invoice being uploaded by the supplier in GSTR-1 and appearing in the recipient's GSTR-2B.

This architecture has shifted operational responsibility upstream. The recipient is now incentivised to monitor supplier compliance, follow up on missing invoices, and demand timely GSTR-1 filing. The single highest-leverage operational shift has been the monthly GSTR-2B reconciliation discipline.

The legislative framework

Section 16(2)(aa) of the CGST Act, 2017 is the foundational provision. The clause requires that the details of the inward supply have been furnished by the supplier in the statement of outward supplies and such details have been communicated to the recipient of such supply in the manner specified under Section 37. GSTR-2B is the communication mechanism.

Section 37 of the CGST Act requires the supplier to file GSTR-1 by the prescribed due date, typically the 11th of the month following the tax period.

Rule 36(4) of the CGST Rules prohibits the recipient from claiming ITC in excess of the GSTR-2B amount.

Rule 60 of the CGST Rules prescribes the GSTR-2B generation mechanic on the 14th of every month.

Section 37A and Rule 67A govern GSTR-1A, the supplier-side amendment return introduced in 2024.

GSTR-2A versus GSTR-2B

The two statements look similar but serve different purposes.

GSTR-2A. A dynamic auto-populated statement that reflects every invoice uploaded by suppliers in GSTR-1 in real time. It updates continuously. GSTR-2A is useful for daily or weekly tracking of supplier compliance but is not the basis of ITC eligibility.

GSTR-2B. A static monthly statement generated on the 14th of every month. It captures invoices uploaded by suppliers up to the 13th of the same month for the preceding tax period. Once generated, the GSTR-2B does not change. New invoices uploaded after the 13th appear in the next month's GSTR-2B.

The recipient's GSTR-3B ITC claim must be reconciled to the GSTR-2B figure, not the GSTR-2A figure. A claim in excess of GSTR-2B is a Rule 36(4) violation and attracts interest and penalty.

The 14-day cut-off mechanic

The 14-day cut-off creates a forcing function across the supplier-recipient chain.

Suppose the recipient receives 100 invoices in April. Of these, 95 are uploaded by suppliers in GSTR-1 by 11 May, and the remaining 5 are uploaded between 12 May and 13 May. All 100 appear in the GSTR-2B generated on 14 May.

Now suppose 90 are uploaded by 11 May, 5 between 12 May and 13 May, and 5 are uploaded after 13 May. The first 95 appear in the May GSTR-2B (covering April invoices), and the remaining 5 appear in the June GSTR-2B (covering May invoices, even though the underlying supply was in April).

The recipient's April ITC is restricted to the 95 invoices in the May GSTR-2B. The remaining 5 invoices' ITC is deferred to June, costing the recipient one tax period of cash flow on the deferred portion.

The GSTR-1A amendment route

GSTR-1A was introduced in 2024 to address in-period corrections. Previously, an invoice uploaded incorrectly or missed by a supplier could only be corrected in the next tax period's GSTR-1, which deferred the recipient's ITC by one period.

GSTR-1A allows the supplier to amend GSTR-1 within the same tax period after filing GSTR-1 but before filing GSTR-3B. The amendment flows into the recipient's GSTR-2B before the GSTR-3B due date.

The workflow for the recipient is:

Download GSTR-2B on the 14th.
Reconcile against the purchase register and identify missing or incorrectly captured invoices.
Contact the supplier with the discrepancy details.
Request the supplier to file GSTR-1A with the correction.
Wait for the GSTR-1A to flow into the updated GSTR-2B.
File GSTR-3B with the reconciled ITC.

The four-step monthly reconciliation workflow

KAMRIT recommends the following monthly reconciliation cycle.

Step 1: GSTR-2B download. On the 14th of every month, download the GSTR-2B JSON or Excel from the GST portal. Import into the reconciliation tool.

Step 2: Purchase register matching. Match the GSTR-2B against the purchase register on a multi-key basis, supplier GSTIN, invoice number, invoice date, taxable value, and tax amount. Identify three categories of mismatch:

Invoices in the purchase register but not in GSTR-2B (missing supplier filings)
Invoices in GSTR-2B but not in the purchase register (supplier-side data error or unaccounted purchase)
Invoices in both but with amount mismatch (data entry errors)

Step 3: Supplier follow-up. Contact non-compliant suppliers with the discrepancy list. Request:

GSTR-1A amendment within the same period for in-period corrections
GSTR-1 filing for the next period for missing invoices
Credit notes or debit notes for amount mismatches

Step 4: GSTR-3B finalisation. Compute the eligible ITC as the lower of the purchase register ITC and the GSTR-2B ITC. Apply ineligible ITC under Section 17(5) (blocked credits). File GSTR-3B by the 20th.

Common reconciliation patterns

KAMRIT has documented the following recurring patterns across client reconciliations.

Pattern 1: Composition dealers and ineligible suppliers. Some suppliers are under the composition scheme or otherwise ineligible to charge GST. Invoices from such suppliers should not appear in GSTR-2B, but where they do, the ITC should be reversed.

Pattern 2: Reverse charge invoices. Reverse charge invoices appear in GSTR-2B but the ITC eligibility is conditional on payment of the reverse-charge tax in GSTR-3B. The reconciliation tool should flag reverse-charge entries for tax payment verification.

Pattern 3: Import IGST. Import IGST is reflected in GSTR-2B based on the bill of entry. The reconciliation should match GSTR-2B IGST to the bill of entry records.

Pattern 4: ITC reversal triggers. Where payment to the supplier is not made within 180 days of the invoice date, the recipient must reverse the ITC under Section 16(2)(b) read with the second proviso. The reconciliation should flag ageing of accounts payable to identify reversal candidates.

Talk to KAMRIT

KAMRIT runs monthly GSTR-2B reconciliation for hundreds of GST-registered clients and advises on the supplier follow-up, GSTR-1A amendment workflow, and the GSTR-3B finalisation process. Talk to KAMRIT to plug your ITC leakage, set up a reconciliation cadence with your suppliers, and prevent the Rule 36(4) and Section 16(2)(aa) exposures that affect most growing businesses.

References

CGST Act, 2017, Section 16(2)(aa), Section 37, Section 37A.
CGST Rules, 2017, Rule 36(4), Rule 60, Rule 67A.
CBIC Notifications on GSTR-2B and Rule 36(4).
Finance Act, 2021 amendment to Section 16(2).
GST Council recommendations on GSTR-1A and the in-period amendment route.