GST Annual Compliance Review 2025-26: Key Changes Before November 2026

GST Annual Compliance Review 2025-26: Key Amendments Before November 2026 Deadline

Summary: The GST framework does not permit revised returns after filing GSTR-1 and GSTR-3B, making the statutory deadline of 30 November 2026 crucial for rectifying errors relating to FY 2025-26. Taxpayers must review outward supplies, GSTIN details, invoice reporting, HSN classifications, and e-invoicing compliance to correct omissions and mismatches. Particular attention should be given to Reverse Charge Mechanism (RCM) liabilities, place of supply errors, and timely issuance of credit notes, as failures may lead to additional tax, interest, or loss of adjustments. A comprehensive Input Tax Credit (ITC) reconciliation between books, GSTR-2B, and GSTR-3B is essential to identify missed credits, excess claims, and vendor-related discrepancies. Businesses should also review blocked credits, Rule 42/43 reversals, unpaid supplier invoices under Rule 37, and supplier tax compliance under Rule 37A. Exporters and SEZ suppliers must verify refund eligibility and documentation. Timely corrections can preserve ITC, improve cash flow, and minimize future litigation and compliance risks.

Background

The Goods and Services Tax (GST) framework does not permit taxpayers to file revised returns once GSTR-1 and GSTR-3B have been submitted. Consequently, any omission, incorrect reporting, excess claim, short payment of tax, or mismatch identified after filing must be rectified through subsequent returns within the statutory time limits.

For transactions pertaining to Financial Year (FY) 2025-26, taxpayers have an opportunity to make corrections up to 30 November 2026. This deadline assumes critical importance, as failure to rectify errors within the prescribed period may result in permanent loss of Input Tax Credit (ITC), denial of tax adjustments, interest liability, and litigation exposure.

This article highlights the key areas that businesses should review before the statutory cut-off date.

1. Amendment of Outward Supplies

Section 37(3) of the CGST Act permits rectification of errors or omissions in details of outward supplies reported in GSTR-1.

Businesses should review:

• Unreported sales invoices.
• Incorrect GSTIN of customers.
• Wrong invoice numbers or dates.
• Incorrect HSN/SAC classification.
• B2B supplies reported as B2C.
• Short payment or non-payment of GST.
• Incorrect reporting of advances received for services.

Any amendment relating to FY 2025-26 can be carried out up to 30 November 2026.

Particular attention should also be given to e-invoicing compliance. While an e-invoice bearing an IRN cannot be amended after generation, necessary corrections may be effected through issuance of debit notes or credit notes in accordance with GST provisions.

2. Reverse Charge Mechanism (RCM) – Commonly Missed Area

One of the most frequent issues observed during GST audits is non-payment of tax under Reverse Charge Mechanism (RCM).

Businesses should review transactions involving complaince of RCM, indicative list of Expenses under RCM as below:

• Goods Transport Agency (GTA) services.
• Import of services.
• Legal services.
• Director remuneration liable to GST.
• Security services.
• Sponsorship services.
• Renting of residential property.
• Royalty payments.
• Motor vehicle hiring services.

Where RCM liability has not been discharged, tax should be paid immediately. Corresponding ITC can be availed only within the prescribed time limit. Any delay beyond the statutory deadline may lead to permanent loss of eligible credit.

3. Correction of Place of Supply Errors

Classification errors between intra-state and inter-state supplies remain a recurring challenge.

Where a transaction has been incorrectly treated as:

• Intra-state supply instead of inter-state supply, or
• Inter-state supply instead of intra-state supply,

the taxpayer is required to pay the correct tax and seek refund of the tax wrongly paid.

Importantly, GST law provides relief from interest liability in such situations, provided the error relates solely to the nature of tax and not to non-payment of tax itself.

4. Credit Notes – Time Limit for Tax Adjustment

Credit notes play a vital role in reducing tax liability arising from:

• Sales returns.
• Post-sale discounts.
• Excess taxable value charged.
• Excess tax charged.
• Deficiency in goods or services supplied.

For FY 2025-26 transactions, credit notes affecting GST liability must be issued and reported within the prescribed statutory timeline. Failure to do so would result in loss of the benefit of reducing output tax liability.

Businesses should conduct a comprehensive review of customer claims, discounts, and returns before the deadline.

5. Input Tax Credit (ITC) Reconciliation – A Critical Compliance Exercise

The GST regime has increasingly shifted towards system-based validation of ITC.

Accordingly, taxpayers should undertake a detailed reconciliation of:

The Invoice Management System (IMS) introduced on the GST portal further emphasizes the importance of accepting and validating invoices appearing in the taxpayer’s records.

Any eligible ITC pertaining to FY 2025-26 that remains unclaimed should be identified and availed before the statutory cut-off date.

6. Verification of E-Invoicing Compliance

Businesses should verify whether suppliers liable for e-invoicing have generated valid e-invoices containing Invoice Reference Numbers (IRN).

Non-compliance by suppliers may expose recipients to litigation regarding the admissibility of ITC.

A systematic vendor compliance review should therefore form part of the year-end GST health check.

7. ITC Reversals – Areas Requiring Immediate Attention

A. Rule 42 and Rule 43 Reversal

Businesses engaged in both taxable and exempt supplies must recompute common credit attributable to exempt supplies on an annual basis.

Any short reversal must be paid, whereas excess reversal can be reclaimed within the prescribed timeline.

B. Non-Payment to Suppliers Within 180 Days

Under Rule 37, ITC attributable to unpaid invoices must be reversed along with interest if payment to suppliers is not made within 180 days.

However, the credit can be reclaimed once payment is subsequently made.

C. Rule 37A – Supplier Fails to Pay Tax

Where the supplier reports invoices in GSTR-1 but fails to discharge the corresponding tax liability, the recipient may be required to reverse the ITC together with interest.

This makes vendor compliance monitoring a critical aspect of GST governance.

D. Excess ITC Claims

Any excess or duplicate ITC claim should be voluntarily reversed to mitigate exposure to interest, penalty, and departmental scrutiny.

8. Review of Blocked Credits Under Section 17(5)

Businesses should revisit expenses on which ITC may have been wrongly claimed.

Common examples include:

• Motor vehicles and related expenses.
• Food and beverages.
• Health and life insurance.
• Club memberships.
• Employee vacation benefits.
• Construction-related expenses.
• Goods lost, destroyed, written off, or distributed as gifts.

A comprehensive review before the annual deadline can significantly reduce future disputes.

9. Reclaim of Previously Reversed ITC

Many taxpayers overlook the opportunity to reclaim ITC previously reversed due to non-payment of suppliers.

Where payment has subsequently been made, the credit may be reclaimed in accordance with Rule 37.

This exercise often results in substantial recovery of eligible credits and improvement in working capital.

10. Export and SEZ Related Compliance

Exporters and SEZ suppliers should carefully verify:

Export Proceeds Realisation

Where refund has been claimed on exports, realization of export proceeds within the timelines prescribed under FEMA becomes crucial.

Failure to realize export proceeds may require repayment of refund along with interest.

Supplies to SEZ

Following amendments in GST law, zero-rated benefits are available only when supplies are made for authorized operations of the SEZ unit or developer.

Accordingly, businesses should ensure that endorsements from SEZ authorities are properly obtained and preserved.

Conclusion

The period up to 30 November 2026 represents the final statutory window for taxpayers to rectify GST reporting errors relating to FY 2025-26. A proactive review of outward supplies, RCM liabilities, ITC claims, blocked credits, export transactions, and vendor compliance can significantly reduce tax exposure and prevent future disputes.

Organizations should treat this exercise not merely as a compliance requirement but as a strategic GST health check. Timely action can help preserve valuable tax credits, improve cash flow, and strengthen overall GST governance.