IMS Deemed Acceptance Under GST: Does 'No Action = ITC' Survive Section 16(2) Scrutiny? Before Section 38 Obtained Statutory Backing, ITC Protection, Interest Trap in a Hard-Locked GSTR-3B

Summary

The Invoice Management System (IMS), launched on 14th October 2024, introduced a 'deemed acceptance' mechanism under which recipient inaction automatically flows an invoice as eligible ITC into GSTR-2B and then into GSTR-3B. Critically, the statutory amendments to Section 38 of the CGST Act that provide IMS its legal framework were notified only on 1st October 2025 vide CBIC Notification No. 16/2025-Central Tax - creating a confirmed 12-month legal gap during which IMS operated without primary statutory backing. Simultaneously, GSTR-3B hard-locking (effective July 2025) makes auto-populated entries unamendable post-filing. This article analyses three unresolved dimensions: whether deemed acceptance satisfies Section 16(2)(aa) alone or creates broader ITC protection; whether ITC claimed during the 12-month gap period is legally protected; and whether 18% interest under Section 50 is justified when a hard-locked GSTR-3B cannot be voluntarily corrected.

1. Introduction

The IMS is the most significant structural change in GST compliance since the introduction of GSTR-2B. Every B2B invoice filed by a supplier in GSTR-1/1A/IFF appears on the recipient's IMS dashboard, where they may Accept, Reject, or keep it Pending. Where no action is taken, the system 'deems it accepted' - routing the ITC into GSTR-2B as eligible credit, which auto-populates into GSTR-3B. Once GSTR-3B is filed under the hard-locking regime effective July 2025, that ITC entry is frozen and unamendable.

This operational chain - deemed acceptance GSTR-2B hard-locked GSTR-3B - creates a three-dimensional paradox: the portal classifies invoices as 'eligible ITC' through a system default, yet the substantive conditions of Section 16(2) remain independently enforceable. Before analysing this, one critical factual development must be noted: the Finance Act 2025 amendments to Sections 34(2) and 38 (Sections 126 and 127) that provide the statutory framework for IMS were notified only effective 1st October 2025. This means IMS operated from October 2024 to September 2025 - a full 12 months - with portal and advisory authority, but without the primary statutory amendments Parliament had specifically enacted for this purpose.

2. The 12-Month Legal Gap - The Statutory Timeline

The sequence of events is as follows. IMS launched on 14th October 2024 - at which point Section 38 of the CGST Act still described GSTR-2B as an 'auto-generated statement,' not contemplating IMS-based recipient actions as its basis. The Finance Bill 2025 (presented 1 February 2025) proposed amending Sections 34(2) and 38 to give IMS statutory foundation. The Finance Act 2025 (No. 7 of 2025) received Presidential assent on 29th March 2025, but Section 1(2)(b) provided that Sections 121 to 129 would come into force only on a date to be separately notified. CBIC Notification No. 16/2025-Central Tax dated 17th September 2025 finally appointed 1st October 2025 as that date.

The result: from 14 October 2024 to 30 September 2025 - 12 full months - IMS operated, GSTR-2B was generated based on IMS actions, and crores of rupees of ITC was claimed through deemed acceptance, all without the amended Section 38 being in force. HN&A LLP's March 2025 article explicitly stated: 'IMS went live on 14th October 2024 in pilot mode without any legal backup.' Similarly, Lakshmikumaran & Sridharan (June 2025) noted the IMS 'lacks legal foundation pending amendments to the CGST Act.' No CBIC circular has yet addressed the legal status of ITC claimed during this gap period.

3. Dimension 1 - Does Deemed Acceptance Satisfy Section 16(2) Comprehensively or Only Section 16(2)(aa)?

Section 16(2) imposes four cumulative conditions for ITC eligibility: (a) possession of a valid tax invoice; (aa) invoice reflected in GSTR-2B (inserted by Finance Act 2021); (b) actual receipt of goods or services; and (c) tax actually paid to the Government by the supplier. IMS deemed acceptance directly and expressly addresses Section 16(2)(aa) - the invoice is in the supplier's GSTR-1/IFF and has appeared in the recipient's GSTR-2B. The fundamental question is whether it creates any protection for Sections 16(2)(b) and (c).

View A - Deemed Acceptance Covers Only Section 16(2)(aa): IMS is a procedural portal mechanism that verifies the supplier filed the invoice - nothing more. It cannot confirm physical receipt of goods or supplier tax payment. The Department remains fully entitled to deny ITC under Sections 16(2)(b) or (c) at any point within the limitation period, regardless of the IMS dashboard status. This view is most consistent with existing GST jurisprudence that treats ITC as a conditional statutory benefit.

View B - Deemed Acceptance Combined with Hard-Locking Creates Qualified Protection: Once the portal has classified an invoice as 'eligible ITC' through deemed acceptance and the GSTR-3B is hard-locked, any ITC reversal demand must be preceded by: (a) establishing actual supplier default; and (b) giving the recipient an opportunity to demonstrate bona fides. The Supreme Court's ruling in Central Board Of Indirect Taxes And Customs Versus M/s. Aberdare Technologies Private Limited & Ors. - 2025 (4) TMI 101 - SC Order - that software limitations cannot prejudice taxpayer rights - supports the argument that a system-imposed entry (deemed acceptance hard-locked GSTR-3B) cannot generate retroactive interest without a finding of recipient fault.

View C - Deemed Acceptance Has No Legal Effect on Section 16(2): IMS is purely an administrative workflow tool entirely separate from the ITC eligibility analysis. Even an explicit Accept action does not mean Section 16(2)(b) or (c) is fulfilled. ITC eligibility is determined solely by the four statutory conditions, and no portal action modifies this.

4. Dimension 2 - Legal Protection for ITC Claimed During the 12-Month Gap Period

The ITC claimed through IMS deemed acceptance from October 2024 to September 2025 presents a unique legal vulnerability. During this period, GSTR-2B was being generated based on IMS recipient actions - yet the amended Section 38, which Parliament specifically enacted to authorise exactly this process, was not yet in force. If a department were to issue an SCN challenging ITC claimed during this period on the ground that the IMS-based GSTR-2B lacked primary statutory backing, three defences are available.

First, promissory estoppel: the Government itself designed, mandated, and operationalised IMS. Taxpayers who claimed ITC in reliance on Government-mandated portal operations cannot be penalised on the ground that the Government failed to timely notify its own statutory amendments. The Supreme Court has consistently held that the state cannot take advantage of its own wrong.

Second, retrospective validation: the Finance Act 2025 amendments, when notified from 1st October 2025, effectively validated the entire IMS framework - including GSTR-2B generation based on IMS actions - as the correct legal position. The notification of these amendments should be read as confirming (not creating) the legal basis for what the portal was already doing, since the underlying power to operate the portal and specify GSTR-2B formats always existed under Sections 146 and 168 read with Section 38 (even in its unamended form).

Third, no prejudice to revenue: since ITC claimed through deemed acceptance ultimately tracks invoices that the supplier has filed in GSTR-1 and on which GST liability has been declared, there is no systemic revenue leakage argument available to the department for challenging the gap-period claims.

5. Dimension 3 - The Hard-Locking Interest Trap Under Section 50

The third dimension is the most practically immediate. Under the current regime, once GSTR-3B is filed with ITC auto-populated from IMS deemed acceptance, that entry is frozen. There is no GSTR-3B revision mechanism under the CGST Act - unlike income tax where Section 139(5) permits revised returns. The only correction mechanism is DRC-03, which invariably attracts interest under Section 50 at 18% per annum from the date of ITC availment.

Consider this scenario: a busy recipient misses reviewing the IMS dashboard one month. One deemed-accepted invoice belongs to a supplier who subsequently defaults on GST payment. The ITC auto-populates into GSTR-2B and is hard-locked into filed GSTR-3B. Two years later, the department detects the supplier's default and issues an SCN demanding reversal with full interest from the date of ITC availment. The recipient: had no ability to prevent the IMS auto-flow; had no ability to amend the hard-locked return; and is charged 18% interest per annum on ITC that the Government's own portal classified as 'eligible.'

The principle in Central Board Of Indirect Taxes And Customs Versus M/s. Aberdare Technologies Private Limited & Ors. - 2025 (4) TMI 101 - SC Order - affirming that software limitations cannot justify denial of taxpayer rights and that bona fide corrections cannot be denied on technical grounds - directly supports the argument that Section 50 interest in such cases should run from the date of the SCN or the date of confirmed supplier default, not from the date of ITC availment. No court has yet applied this principle to the IMS hard-locking scenario - making it an entirely open legal question.

6. Summary of Three Dimensions

7. Key Takeaways

First, IMS deemed acceptance satisfies Section 16(2)(aa) only. Practitioners must independently verify Section 16(2)(b) receipt of goods and Section 16(2)(c) supplier tax payment - especially for high-value invoices. The portal's 'eligible ITC' classification carries no statutory protection against departmental challenge on substantive grounds.

Second, for ITC claimed during the 12-month gap period (October 2024 - September 2025), document reliance on Government-mandated portal operations and prepare a promissory estoppel argument. Petition CBIC through professional bodies for a retrospective protective circular - similar to savings provided when GSTR-2A was non-functional in 2017-19.

Third, under the hard-locking regime, proactive IMS management is now a tax risk management function. Build internal processes to: review the IMS dashboard before the 14th of every month; reject invoices where goods are not yet received; and verify supplier GSTR-3B filings before accepting high-value invoices. Inaction today can produce a DRC-03 demand with 18% interest years later.

Fourth, where a departmental SCN demands Section 50 interest on ITC that was portal-generated through deemed acceptance and frozen in a hard-locked GSTR-3B, invoke the Aberdare Technologies principle before the adjudicating authority: software-imposed entries cannot generate penal interest from the date of system availment; interest should run only from the date of supplier default confirmation or SCN issuance.

8. Conclusion

The IMS deemed acceptance mechanism, the confirmed 12-month statutory gap before Section 38 obtained its amended form, and GSTR-3B hard-locking together create a three-dimensional compliance paradox that will manifest as real SCNs and real interest demands as audit cycles catch up with IMS-era filings. The author recommends that CBIC urgently issue a Circular under Section 168:

(i) Clarifying that IMS deemed acceptance satisfies Section 16(2)(aa) and creates a rebuttable presumption of ITC eligibility, while affirming that Sections 16(2)(b) and 16(2)(c) remain independently applicable;

(ii) Confirming that all ITC claims made through IMS between 14th October 2024 and 30th September 2025 - when the amended Section 38 was not yet in force - are protected and shall not be challenged solely on the ground of absence of primary statutory backing for IMS during this period;

(iii) Providing that where ITC is auto-populated into a hard-locked GSTR-3B through IMS deemed acceptance and the department demands reversal on Section 16(2)(c) grounds, interest under Section 50 shall accrue only from the date of the demand notice - not from the date of ITC availment - where the taxpayer demonstrates that the entry was system-generated and could not be voluntarily corrected; and

(iv) Directing GSTN to introduce an 'IMS Conditional Accept' feature that allows recipients to accept an invoice for Section 16(2)(aa) purposes while flagging Section 16(2)(c) verification as pending - preventing hard-locking of potentially reversible ITC claims.

Otherwise IMS is a commendable initiative that brings real-time, invoice-level compliance discipline to GST. Its statutory foundation is now solid from 1st October 2025. But the three unresolved questions identified here - covering the gap period, the Section 16(2) interaction, and the hard-locking interest trap - must be addressed before the combination of IMS automation and GSTR-3B hard-locking produces a wave of interest-laden SCNs against taxpayers who acted in good faith on Government-mandated portal operations.