The Goods and Services Tax Network (GSTN) has issued a fresh advisory announcing a revision in the timeline for amendment of Aggregate Annual Turnover (AATO) for the financial year 2025-26. The revised schedule comes into effect as GSTN upgrades its AATO functionality to allow automatic updation of Aggregate Annual Turnover whenever subsequent GST returns are filed after the amendment window closes.

According to the advisory issued on July 1, 2026, the enhanced functionality aims to improve consistency, accuracy, and uniformity of AATO across different modules of the GST Portal.

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AATO Amendment Window Shifted from May to July

GSTN had earlier introduced the AATO amendment facility through an advisory dated May 2, 2022, under which taxpayers could modify their Aggregate Annual Turnover during the month of May. That mechanism remained applicable up to FY 2024-25.

For FY 2025-26, however, the amendment window has now been shifted to July owing to the implementation of the upgraded system.

As a result, taxpayers seeking to correct or update their Aggregate Annual Turnover must submit their amendment applications during the revised period.

Revised Timeline for FY 2025-26

Tax Officers to Verify Amended Details

Once taxpayers submit amendment requests, the revised AATO figures will be made available to the jurisdictional Tax Officers for verification from August 1 to August 15, 2026.

The verification process is intended to ensure that amended turnover details are accurate before they are reflected across GST Portal functionalities.

Purpose of the System Upgrade

GSTN stated that the AATO functionality is being enhanced to enable automatic updation of Aggregate Annual Turnover whenever taxpayers file subsequent GST returns after the amendment window. This is expected to eliminate inconsistencies that may arise due to later return filings and improve data synchronization across the GST ecosystem.

The changes are aimed at:

• Improving accuracy of Aggregate Annual Turnover.
• Ensuring uniform reporting across GST Portal modules.
• Reducing discrepancies arising from subsequent return filings.
• Streamlining verification by tax authorities.

Advisory to Taxpayers

GSTN has advised taxpayers to carefully verify the Aggregate Annual Turnover before submitting any amendment request during the application window.

In case of any technical issues or concerns, taxpayers should raise a grievance through the Self-Service Portal available on the GST Portal, along with all relevant details, to facilitate timely resolution.

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