Failure of IMS in Reporting Credit Note Rejections Leading to Excess GSTR-3B Tax Liability

Failure of IMS in Reporting Credit Note Rejections Leading to Excess GSTR-3B Tax Liability – An Unsettling Experience from Day-to-Day GST Compliance

GST compliance today is largely system-driven. As professionals, we rely heavily on portal-based reports, IMS dashboards and auto-populated liabilities to ensure correctness. However, there are instances where the system speaks only through numbers, not through explanations.

This article highlights one such practical issue faced during routine GST reconciliation, where a credit note issued in June quietly converted into additional tax liability in December, without any visible trail on the GST portal.

The Trigger Point – Unexpected Excess Liability in December GSTR-3B

While filing GSTR-3B for December 2025, an unexpected increase in tax liability was noticed. What made the situation puzzling was that:

• There was no corresponding outward supply in December
• GSTR-1 for December was fully reconciled
• No debit notes, amendments, or omissions existed

In a system where GSTR-3B is expected to broadly align with GSTR-1, such variance naturally raises concern.

Initial Verification – IMS Shows Nothing

The first and obvious step was to check the Invoice Management System (IMS) under the supplier’s login:

• IMS → Outward Supplies → Rejected View → Credit/Debit Notes
• November 2025 – No rejected records
• December 2025 – No rejected records

In short, IMS did not provide any explanation for the additional tax appearing in December GSTR-3B. At this stage, the portal offered no clue whatsoever. Enclosed the screenshot for your reference.

Recipient’s Filing Pattern – A Critical but Indirect Clue

Upon examining the recipient’s return filing status (separately and independently):

• The recipient had not filed returns on a regular monthly basis
• Returns from May to November 2025 were filed together on 17-12-2025 as shown in screenshot

• December 2025 return was filed later, in January 2026

This delayed filing by the recipient became an important contextual factor, though no direct system linkage was visible at the supplier’s end.

The Real Work Begins – Backward Reconciliation

Since current-month tools failed, the only option left was manual backward reconciliation. Month by month, earlier transactions were reviewed. After multiple rounds of verification, the issue was finally traced to:

• A credit note issued by the supplier in June 2025
• Properly reported at the time
• The recipient, however, rejected this credit note when filing delayed returns in December 2025

This discovery was possible only through internal records and historical tracking, not through the GST portal.

The Core Issue – Rejection Without Visibility

Here lies the real concern:

• The June credit note was rejected by the recipient
• The tax impact of that rejection was pushed into December GSTR-3B
• But the rejection itself never appeared in IMS, neither in June nor in December

In effect:

The system adjusted the tax, but did not disclose the event that caused it.

Why This Is a Serious Practical Concern

This situation creates multiple challenges:

• Suppliers are exposed to unexpected tax liability
• There is no system-generated audit trail
• Reconciliation becomes forensic rather than procedural
• During audits or departmental queries, explaining such variance becomes difficult

Most importantly, IMS fails at the exact point where transparency is most needed.

Practical Takeaways for Professionals

Until the system evolves, a few safeguards become essential:

1. Maintain an independent credit note tracking register – Do not rely solely on IMS for historical rejections.

2. Closely monitor recipients with delayed or irregular filings – Their actions can impact supplier liability much later.

3. If GSTR-3B exceeds GSTR-1, look backward, not forward – The issue may lie several months behind.

4. Preserve working papers and reconciliation notes – They may become the only explanation available later.

Conclusion – When the System Adjusts Tax but Not Transparency

GST compliance is no longer just about correct reporting; it is about understanding silent system behaviour. When:

• A credit note issued in June,
• Rejected months later due to recipient delay,
• Converts into December tax liability,
• Without any IMS disclosure,

…it places an unreasonable burden on the supplier and the professional.

This is not about non-compliance. This is about system opacity. One hopes that future portal enhancements will ensure that every tax adjustment is accompanied by clear visibility, especially in cases involving credit note rejections.

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Author’s Note: This article is based on actual reconciliation experience during GST compliance and is intended to highlight a practical system issue faced by professionals. The views expressed are personal and aimed at improving clarity and compliance efficiency. For any query related to above article, or if you face any issue in Income Tax, GST, SEZ, STPI, MCA compliances etc., especially in cases involving legal proceedings, notices, litigation, or demand matters. Please feel free to contact us at the details mentioned below:

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