GST invoice matching: what to check under the current IMS process

The Invoice Management System gives a GST-registered recipient a place to review records uploaded by suppliers and to accept, reject or keep eligible records pending. It helps organise invoice matching, but it does not replace the legal checks for input tax credit. The workflow below focuses on domestic supplier invoices reported through GSTR-1, GSTR-1A or IFF; it is not a complete guide to imports or reverse-charge supplies.

Three questions should remain separate each month:

1. Does the purchase exist in the business’s books and supporting records?

2. Has the supplier reported and filed the document so that it reaches IMS and GSTR-2B?

3. Does the credit satisfy the conditions and restrictions in the GST law?

An invoice can pass one question and fail another. Treating the IMS action as the whole ITC decision creates avoidable errors.

IMS Offline Tool added in April 2026

GSTN published an update on 21-04-2026 introducing an Excel-based IMS Offline Tool for individual and bulk invoice actions. The update changed how taxpayers with larger volumes can process IMS data; it did not announce a new legal condition for ITC. GST Council Secretariat, April 2026 newsletter, GST portal update dated 21-04-2026.

The underlying IMS process started from the October 2024 tax period. GST Council Secretariat, April 2026 newsletter. From the October 2025 tax period, specified credit notes and related documents could be kept pending for a limited period. When accepting such a record, the recipient could adjust the ITC reduction to the extent of credit actually availed. GST Council Secretariat, October 2025 newsletter, GST portal updates dated 08-10-2025 and 17-10-2025.

The portal clarified the change on 08-10-2025 and carried a further update on 17-10-2025. The functionality applied from the October 2025 tax period. It should now be treated as part of the operating process, not as a September 2026 announcement.

How IMS feeds the monthly review

Supplier records saved in GSTR-1, GSTR-1A or IFF can flow to the recipient’s IMS dashboard. Only filed records are considered when GSTR-2B is computed. The recipient can generally take one of four positions:

• Accept: the record is included in the relevant GSTR-2B calculation.

• Reject: the record is excluded from the GSTR-2B calculation.

• Pending: the record stays out of that period’s GSTR-2B. Eligible Pending records carry forward for later action, subject to the time limit applicable to that record.

• No action: the system treats the record as deemed accepted for GSTR-2B generation.

If an action is taken or changed after draft GSTR-2B generation, the recipient needs to recompute GSTR-2B before filing the corresponding GSTR-3B. Accepted, deemed-accepted and rejected records for that period move out of IMS after the GSTR-3B is filed; eligible Pending records remain for action in a later period. GSTN revised IMS advisory.

The special Pending window introduced for specified credit notes and related records lasts one additional tax period for the recipient: one month for a monthly filer or one quarter for a quarterly filer. It ends on the GSTR-3B due date for the tax period immediately following the record’s applicable GSTR-2B period, determined from the supplier’s source-return filing date. After expiry, Pending is disabled; if no action is taken, the system treats the record as deemed accepted. Record this expiry date in the exception tracker. GSTN, FAQ on New Changes in Invoice Management System (IMS) from October 2025 Tax Period, questions 4–5.

“Deemed accepted” describes a system outcome. It does not prove that the supply was received, that the purchase was for business, that credit is not blocked or that every other legal condition is met.

Match the document before choosing an action

Use a stable matching key across the purchase register, invoice image, IMS download and GSTR-2B. At minimum, compare:

• supplier GSTIN;

• invoice or debit-note number and date;

• taxable value and each tax component;

• place of supply and tax type;

• purchase classification and receipt of goods or services;

• amendment or credit-note link to the original document.

Standardise harmless formatting differences before treating two entries as mismatches. An invoice number entered with a slash in one system and a hyphen in another may still be the same document. Do not standardise away a different GSTIN, date or tax amount.

Classify exceptions by cause. A duplicate, an invoice belonging to another recipient, a value error, an unrecorded credit note and a missing supplier upload need different responses. Keep the exception list with the action taken, the person responsible, the next review date and any applicable Pending expiry date.

If an invoice is missing from GSTR-2B

A purchase invoice in the books may be absent from GSTR-2B because the supplier has not uploaded it, saved but not filed it, used the wrong recipient GSTIN or reported it after the relevant cut-off. Start by checking IMS, the invoice particulars and the supplier’s filing status available to the business. Do not use Reject for a document that is absent; there is no IMS record to reject.

Send the supplier a precise exception, with the invoice number, date, taxable value, tax and expected GSTIN. Ask whether the document was included in GSTR-1, GSTR-1A or IFF and in which tax period. Request correction through the supplier’s applicable return process rather than asking for a screenshot alone.

Keep the purchase recorded in the books if it is a real business transaction. The ITC decision is separate. Section 16(2)(aa) of the CGST Act requires the supplier to furnish invoice or debit-note details in its outward-supply statement and for those details to be communicated to the recipient. Section 16 also contains other conditions, including possession of the document, receipt of the supply and furnishing the recipient’s return. Central Goods and Services Tax Act, 2017, section 16.

The GST portal describes GSTR-2B as an auto-drafted ITC statement and advises taxpayers to reconcile it with their books, prevent duplicate credit and self-assess other reversals or restrictions. GST portal FAQ on GSTR-2B.

Portal status and ITC eligibility need separate evidence

An accepted record may still be ineligible. Examples include a non-business purchase, a blocked credit, goods or services not received, an incorrect place-of-supply treatment, or credit outside the applicable time limit. A pending record may be commercially genuine but awaiting correction or receipt. A rejected record may need the supplier to amend and re-report it before credit can appear correctly.

Use two fields in the reconciliation instead of one:

This separation also helps with credit notes. From the October 2025 tax period, the recipient can adjust the ITC reduction on acceptance to the extent of credit actually availed. The amount should follow the credit ledger and any reversal already recorded. It should not be chosen merely to clear the dashboard.

A workable monthly close

Download the purchase register, IMS data and GSTR-2B for the same GSTIN and period. Match exact records first, then review value differences, missing documents, duplicates, credit notes and amendments. Record the proposed IMS action and the independent ITC decision. After any late action, recompute GSTR-2B and compare the revised total before filing GSTR-3B.

For a large invoice set, the offline tool introduced on 21-04-2026 can support bulk work. Validation still needs a controlled source file, a review of exceptions and a check that the uploaded actions match the approved reconciliation.

Before filing GSTR-3B, retain a traceable link from each material supplier document to the books, the portal record, the ITC decision and the amount reported in the return.