What is the primary difference between GSTR-2B and IMS?

GSTR-2B is a static statement generated on the 14th of every month that dictates your claimable ITC in GSTR-3B. IMS is an active, dynamic workspace available throughout the month where you can review, Accept, Reject, or mark Pending every supplier invoice before GSTR-2B is finalized.

What happens if I mark an invoice as 'Pending' in IMS?

When an invoice is marked 'Pending', it is not included in the GSTR-2B for the current tax period, and you do not claim ITC for that month. The invoice remains alive in IMS and rolls over to the next tax period, giving you time to receive goods, inspect invoices, or obtain corrections from your supplier.

What happens if I take 'No Action' on an invoice before the 14th?

Under the latest GST portal policy, any forward charge invoice or debit note with 'No Action' is automatically treated as 'Deemed Accepted' when GSTR-2B is generated on the 14th. It will flow directly into your GSTR-2B and GSTR-3B Table 4(A)(5).

Can I claim ITC on an invoice that is in my purchase register but not in GSTR-2B or IMS?

Strictly no. Following the amendment to Section 16(2)(aa) and substitution of Rule 36(4), claiming ITC on invoices not appearing in GSTR-2B is unlawful. Doing so will lead to automated mismatch notices (Form DRC-01C / ASMT-10) demanding reversal with 18% interest.

How does the recipient's action on a Credit Note affect the supplier?

If the recipient Accepts a Credit Note, the supplier's output tax liability is reduced, and the recipient must reverse ITC in GSTR-3B Table 4(B)(2). If the recipient Rejects the Credit Note, the supplier's liability reduction is cancelled and added back to the supplier's GSTR-3B.

What is the time limit under Section 16(4) to claim missing ITC?

The statutory deadline to avail Input Tax Credit for any financial year (e.g. FY 2024-25) is 30th November of the following financial year (i.e. 30th November 2025), or the date of filing the Annual Return (GSTR-9), whichever is earlier. Beyond this date, ITC lapses irrevocably.

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GSTR-2B & IMS Reconciler

Reconcile purchase register with GST IMS & GSTR-2B. Auto-detect matched, mismatched & missing invoices with Accept/Reject/Pending actions.

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GSTR-2B & IMS Reconciler Tool

Reconcile your purchase register against the GST Invoice Management System (IMS) and GSTR-2B. Auto-detect matched, mismatched, and unreported invoices with actionable Accept, Reject, and Pending suggestions.

Excel (.xlsx / .xls)GST Portal JSON (.json)CSV RegistersPDF Invoices (Best-Effort)Auto-Normalization (INV/01 ↔ inv-1)Deemed Acceptance Safeguard

STEP 1: GST PORTAL EXPORT

1. IMS / GSTR-2B Data

Download Excel or JSON from GST Portal: Services → Returns → IMS

Click or drag IMS / GSTR-2B file here

Excel (.xlsx), Portal JSON (.json), CSV or PDF

STEP 2: INTERNAL ACCOUNTING BOOKS

2. Purchase Register (Books)

Export from Tally Prime, Busy, Zoho Books, Marg ERP, or SAP

Click or drag Purchase Register file here

Excel (.xlsx), CSV, JSON or standard ERP export

Tolerance (₹)

Allows rounding leeway up to ₹1 per invoice line.

Official Instructions for GST IMS & GSTR-2B Reconciliation

Downloading from GST Portal: Log in to GST Portal → Navigate to Services → Returns → Invoice Management System (IMS) → Click View → Select Tax Period → Download Excel or JSON file. A GSTR-2B download also works identically.
Exporting your Purchase Books: Export your purchase register from Tally, Busy, Zoho Books, or SAP. Ensure columns for Supplier GSTIN, Invoice Number, Taxable Value, and Taxes (IGST/CGST/SGST) are included.
Automatic Normalization: Slashes, hyphens, spaces, and leading zeros are automatically sanitized so that INV/2024/001 matches inv-1 seamlessly.
Statutory 14th Cutoff Rule: Any invoice where No Action is selected by the 14th of the following month is automatically treated as Deemed Accepted and will populate your GSTR-2B.
Section 16(2)(aa) Mandate: Invoices classified as Only in Books must NOT be claimed in GSTR-3B Table 4(A)(5) until reported by the vendor to avoid Departmental ASMT-10 or DRC-01A recovery notices.

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GST IMS & GSTR-2B Legal Compliance Specialist

Indirect Tax Auditor & IMS Dispute Counsel · Digital Bharat Law

Understanding GSTR-2B & IMS Reconciler

The Invoice Management System (IMS) is a transformative facility introduced on the GST portal to streamline Input Tax Credit (ITC) matching and eliminate mismatches between supplier GSTR-1 filings and recipient GSTR-2B/3B claims. Under IMS, every invoice, debit note, and credit note reported by a supplier becomes immediately visible to the recipient for action.

Recipients can choose to 'Accept', 'Reject', or keep 'Pending' each transaction before the 14th of the following month. Invoices marked as 'Accept' (or left with 'No Action' which defaults to Deemed Accepted) are compiled into the recipient's auto-generated GSTR-2B on the 14th, directly establishing the eligible ITC figure in Table 4(A)(5) of Form GSTR-3B.

This reconciler processes your internal accounting records (from Tally, Busy, SAP, or Zoho) alongside the portal's IMS/2B download, categorizing records into Matched, Value Mismatch, Probable Match, Missing in Books, or Missing in Portal, providing clear statutory advice on which action to take for maximum compliant tax savings.

Core Calculation FormulaOfficial Rule

Net Claimable ITC (GSTR-3B Table 4) = Accepted Invoices ITC - Accepted Credit Notes ITC [Rule 36(4)]

Matched & Accepted Invoices: Invoices verified in books and portal; full ITC availed in Table 4(A)(5)

Pending Invoices: Goods in transit or disputed amounts; ITC deferred to future tax period

Rejected Invoices: Erroneous, duplicate or unreceived invoices; zero ITC availed, removed from 2B

Missing in 2B (Books Only): Vendor has not filed GSTR-1/1A; strictly unclaimable under Sec 16(2)(aa)

* Documents where 'No Action' is taken automatically become 'Deemed Accepted' on the 14th of each month.

Key Regulatory Rules & Thresholds (FY 2025–27)

Essential departmental provisions, tax brackets, and statutory compliance mandates.

Section 16(2)(aa) & Rule 36(4) Strict Matching

Sec 16(2)(aa)

No taxpayer can avail Input Tax Credit in GSTR-3B unless the details of the invoice have been uploaded by the supplier and communicated to the recipient in Form GSTR-2B via IMS.

Monthly 14th Cutoff & Deemed Acceptance

14th Cutoff

GSTR-2B is generated on the 14th of the subsequent month. Any document with 'No Action' taken by the recipient defaults to 'Deemed Accepted' and populates GSTR-2B.

Credit Note Rejection & Tax Impact

CDNR Rule

Rejecting a supplier's Credit Note in IMS blocks the supplier's liability reduction, ensuring the recipient is not forced to reverse ITC unless genuinely agreed.

Section 16(4) 30th November Final Deadline

Sec 16(4)

ITC for any invoice of a financial year must be claimed before 30th November following the end of that FY or annual return filing, whichever is earlier.

GSTR-1A Supplier Rectification Window

GSTR-1A

Suppliers can upload or correct invoices missed in GSTR-1 using Form GSTR-1A before filing GSTR-3B, which immediately reflects in the recipient's IMS.

Section 50 Mandatory 18% Interest Risk

Sec 50

Availing ITC without GSTR-2B support triggers automatic System ASMT-10 or DRC-01A recovery notices with 18% annual interest from the date of wrongful claim.

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