AATO Amendment 2026: Revised Timeline Advisory by GSTN

Did you miss the May deadline to make the Aggregate Annual Turnover adjustment for FY 2025-26? GSTN has issued a fresh advisory extending the extension of amendments from May to July 31, 2026. This is a major comfort to taxpayers whose aggregate annual turnover has not been matched with business turnover as reported on the GST portal for the whole year.

An incorrect AATO will have an impact on your e-invoicing threshold, the frequency of returns, and your categorisation for compliance. This guide walks you through what’s changing, why it matters, and what you need to do before July 31, 2026.

What Is Aggregate Annual Turnover and Why Does It Matter?

First, let’s get clear on what “Aggregate Annual Turnover” actually means. It’s the sum of all your taxable, exempt, export, and inter-State sales in a year, tallied across India under your PAN.

Why AATO Directly Impacts Your GST Compliance

An incorrectly reported Aggregate Annual Turnover on the GST portal has cascading effects:

• E-invoicing applicability: Mandatory for businesses above Rs. 5 crore AATO
• Return filing frequency: Determines eligibility for the QRMP scheme (quarterly vs monthly)
• Composition Scheme (Section 10): generally up to ₹1.5 crore (₹75 lakh for certain special category states).
• Composition Scheme for service providers (CMP-08 scheme): up to ₹50 lakh.
• Late fee caps on GSTR-3B: Linked to turnover brackets
• HSN reporting level: 4-digit vs 8-digit HSN based on AATO threshold

If your AATO shown on the portal is incorrect, these thresholds may be applied incorrectly, causing compliance mismatches across multiple modules of the GST portal.

GSTN Advisory July 2026: What Changed for AATO Amendment

On July 1, 2026, the GSTN announced new rules for updating your Aggregate Annual Turnover for the 2025-26 financial year. This update cancels the earlier instructions 
from May 2, 2022, which applied to changes for 2024-25.

Why the Timeline Was Revised

Two reasons drove this change:

• System upgrade: The AATO functionality is being upgraded to enable automatic updation of AATO as subsequent returns are filed after the amendment window, removing the need for manual correction after each late filing
• Consistency and accuracy: Certain system-level enhancements are being implemented to ensure greater uniformity in AATO reporting across various GST portal modules

The amendment window has been shifted from May to July for FY 25-26, while the functional enhancement has been rolled out from July 1, 2026.

Revised AATO Amendment Timeline at a Glance

Who Needs to File an AATO Amendment for FY 2025-26?

Not every taxpayer needs to file an amendment. You need to act if any of the following situations apply to your business.

When You Must Review and Amend Your AATO

• Your actual turnover for FY 2025-26 is different from what the GST portal currently shows.
• Returns were filed late after the original AATO computation period, resulting in the portal capturing incomplete turnover data.
• Your business crossed or fell below a key threshold (Rs. 1.5 crore, Rs. 2 crore, Rs. 5 crore), and the portal does not reflect this correctly.
• Your AATO is affecting your current e-invoicing applicability status incorrectly.
• You were placed in the wrong QRMP scheme category (monthly vs quarterly) based on an incorrect AATO.

Who May Not Need to Amend

• Taxpayers whose AATO displayed on the portal matches their actual FY 2025-26 turnover exactly.
• Businesses whose compliance thresholds remain unaffected regardless of minor turnover variations
• Composition scheme taxpayers where the composition turnover cap is clearly not breached

How to File the AATO Amendment on the GST Portal?

If your AATO is incorrect, submit the amendment request between July 1 and July 31, 2026. There is no flexibility here; if you miss the deadline, you’re out of options.

Step-by-Step Amendment Process

1. Log in to the GST portal (gst.gov.in) with your GSTIN details.
2. Once you’re in, select the AATO amendment option. You’ll find it in your taxpayer profile or right on the dashboard.
3. Review the AATO for FY 2025-26 while it is on display.
4. Compare this amount with your actual filed returns, namely GSTR-1, GSTR-3B, and your books of accounts for the entire year.
5. If the figure is incorrect, enter the correct Aggregate Annual Turnover
6. Review all amended details carefully before submission
7. Submit the amendment application within the July 1 to July 31, 2026, window
8. After submission, your jurisdictional Tax Officer will review the amendment between August 1 and August 15, 2026

Before You Submit: What to Cross-Check

• Total outward supplies declared in GSTR-1 across all months of FY 2025-26
• Tax paid in GSTR-3B across all twelve months
• Any late-filed returns whose data may not have been captured in the original AATO
• Inter-State supplies made under IGST
• Exempted and nil-rated supplies (these are included in the AATO calculation)
• Exports of goods and services (included in AATO even though zero-rated)

What Happens After You Submit the AATO Amendment?

After you submit your AATO amendment application, the process moves to the tax officer review stage.

Post-Submission Process

• Your amended AATO details will become available for your jurisdictional Tax Officer from August 1, 2026
• The Tax Officer has until August 15, 2026, to review and confirm or query the amendment.
• The updated AATO gets reflected across all modules of the GST portal once it is confirmed.
• With the new automated functionality, any returns processed after the amendment window will also update the AATO automatically, thereby minimizing the need for repeated corrections with resulting efficiency benefit.

What to Do If You Face Difficulty

• If you encounter any technical issues or concerns while submitting the amendment, raise a grievance through the Self-Service Portal available on the GST portal.
• Include all relevant details such as GSTIN, tax period, and description of the issue.
• GSTN will facilitate prompt resolution through this channel

Impact of Incorrect AATO on Key Compliance Areas

An incorrect Aggregate Annual Turnover has real, quantifiable compliance consequences. This table illustrates what can go wrong.

Conclusion

The GSTN advisory dated July 1, 2026, revises the Aggregate Annual Turnover amendment window for FY 2025-26 to July 1 through July 31, 2026, replacing the earlier May window. The change is driven by a system upgrade that will enable automatic AATO updation as returns are filed, improving accuracy across all GST portal modules. 

All taxpayers must review their current AATO, cross-verify it against actual filed returns and books of accounts, and submit the amendment application before July 31. Tax officer review follows from August 1 to August 15. Do not miss this window; there is no provision for late amendment after July 31, 2026.

MyGSTRefund's CFO dashboard and AI-powered compliance tools help businesses maintain accurate turnover data, file returns on time, and ensure your AATO reflects correctly across all GST portal modules.

Frequently Asked Questions (FAQS)

1. What was the earlier AATO amendment window, and how has it changed for FY 2025-26?
Before, the window for changes ran from May 1 to May 31. But with the system upgrades going live on July 1, 2026, GSTN shifted the window. So, for this year, you get the whole month of July, from July 1 through July 31, 2026, to make any amendments for the 2025-26 financial year.

2. Why is GSTN upgrading the AATO system from July 1, 2026?
The upgrade enables automatic updation of AATO as subsequent returns are filed after the amendment window. This will remove the need for manual corrections every time a late return is filed and ensure the accuracy and uniformity of returns made in the different modules of the GST portal.

3. What happens if a taxpayer does not amend the AATO within the July 31, 2026, deadline?
The amendment window closes July 31, 2026. The taxpayer with a missing AATO by this period will be required to work with the current AATO availed on the Invoices portal for FY 2025-26, which can impact e-invoicing status, filing frequency, etc. of the taxpayer.

4. Will the amended AATO be automatically updated in the future after returns are filed?
Yes. The new system functionality, being deployed from July 1, 2026, enables automatic AATO updation as subsequent returns are filed post the amendment window. This is a significant improvement over the earlier manual process.

5. Who reviews the AATO amendment after submission by the taxpayer?
The jurisdictional Tax Officer reviews all AATO amendment applications submitted by taxpayers. The review window for FY 2025-26 amendments is August 1 to August 15, 2026. Taxpayers should ensure their amendments are accurate before submission, as the officer's review follows immediately.