Last updated: 6 July 2026. There is one number on your GST dashboard that quietly decides how you invoice, how often you file, and how much detail you report — your Aggregate Annual Turnover, or AATO. The portal calculates it for you from the returns you have filed. For most of the year you cannot touch it. But for FY 2025-26, a narrow window is now open: you can review and correct that figure between 1 and 31 July 2026, and only then. Miss it, and the system's number stands for the year.
Applicability Note: This guide reflects GST provisions, notifications, and GSTN advisories applicable as of 6 July 2026. The AATO amendment window and review dates are set by the GSTN advisory dated 1 July 2026 and can change through further advisories; the GST portal is the authoritative source. Always verify on gst.gov.in or with a GST professional before acting on your turnover figure.
What AATO Actually Is
Aggregate Annual Turnover is the total turnover the GST system attributes to your PAN across the financial year — pulled together from the returns you filed, aggregated across all your GSTINs. It appears on your taxpayer dashboard when you log in. You did not enter it; the portal computed it. And because it is computed, it can be wrong: a return filed under the wrong head, an amendment that did not flow through cleanly, exempt or non-GST turnover counted or missed, or figures that simply do not tie to your audited books.
That would be a harmless discrepancy if AATO were just a display number. It is not. It is the switch behind several of your obligations for the coming year.
What Changed This Year
Two things are new for the FY 2025-26 cycle, both set out in the GSTN advisory dated 1 July 2026:
- The window moved from May to July. For financial years up to FY 2024-25, the amendment facility opened in May (per the earlier GSTN advisory dated 2 May 2022). For FY 2025-26 it runs 1 to 31 July 2026. If you were waiting for a May window this year, it is not coming — it has already shifted.
- AATO now updates automatically after the window. Upgraded functionality deployed from 1 July 2026 means that once the amendment window closes, your AATO keeps updating on its own as you file subsequent returns — you are no longer frozen to a once-a-year figure. GSTN's stated aim is more consistent and uniform turnover reporting across the portal.
The practical takeaway: the manual correction you can make is a July event. The automatic upkeep is year-round after that.
Why the Number Matters — the ₹5 Crore Line
Most of the obligations AATO controls pivot on ₹5 crore. Whether your FY 2025-26 turnover sits just above or just below that line changes what you must do in FY 2026-27:
- E-invoicing. E-invoicing is mandatory once aggregate turnover crosses ₹5 crore in any financial year from 2017-18 onwards — the threshold was reduced to ₹5 crore with effect from 1 August 2023 by Notification No. 10/2023-Central Tax dated 10 May 2023. So an FY 2025-26 figure that crosses ₹5 crore can bring you into e-invoicing, and once you are in, you stay in. Every B2B invoice then needs an IRN and QR code from the portal, or your buyer cannot claim the credit.
- QRMP eligibility. The Quarterly Return Monthly Payment scheme is open to taxpayers with aggregate turnover up to ₹5 crore. An overstated AATO can wrongly read you out of quarterly filing; an understated one can leave you in a scheme you are no longer entitled to.
- HSN reporting. Under Notification No. 78/2020-Central Tax dated 15 October 2020, GSTR-1 needs 6-digit HSN codes if your turnover is above ₹5 crore and 4-digit if it is up to ₹5 crore. The portal validates this, so the wrong turnover band can trip your Table 12 validations.
- Annual returns. GSTR-9 is not required where aggregate turnover is up to ₹2 crore, and the self-certified reconciliation statement GSTR-9C becomes due once turnover crosses ₹5 crore. Your AATO decides which of these you owe.
The risk cuts both ways. An inflated AATO can saddle you with e-invoicing, 6-digit HSN, and GSTR-9C you do not actually owe. A deflated AATO can hide an obligation you do owe — and a missed e-invoicing mandate is not a small thing to explain later. This is why the window is worth ten minutes even if you think your number looks fine.
How to Amend It — and What Happens Next
The AATO shown on your dashboard is what you review. During the window, the portal lets you revise the system-computed figure to the turnover you can support from your books. Once you submit a revision, it does not take effect silently — the amended figures are placed before your jurisdictional tax officer, who reviews them between 1 and 15 August 2026. In other words: correct it in July, expect officer review in the first half of August.
Two habits make this clean:
- Reconcile before you touch the figure. Have your FY 2025-26 turnover tied to your books and returns first, so the number you enter is defensible when the officer looks at it. Do not amend on a hunch.
- Keep your working. If the system-computed figure and your books differ, be ready to show why — the reconciliation is what supports the amendment on review.
If you hit a genuine problem with the functionality, GSTN's advice is to raise a grievance through the Self-Service Portal on gst.gov.in with the relevant details, rather than letting the window lapse.
What to Do Before 31 July 2026
- Log in and read your AATO on the dashboard — do not assume it is right.
- Reconcile it to your audited/booked FY 2025-26 turnover across all GSTINs on the PAN.
- Check which side of ₹5 crore (and ₹2 crore) you land on, and what that means for e-invoicing, QRMP, HSN digits, and annual returns in FY 2026-27.
- Amend within the window if the figure is wrong — the facility closes 31 July 2026, and officer review runs 1–15 August.
- File a grievance via the Self-Service Portal if the functionality misbehaves; do not let the window pass.
The rest of July has its own filing calendar too — TDS/TCS returns, the QRMP quarterly GSTR-1, CMP-08, and GSTR-3B all fall due this month. See the full July 2026 deadline calendar so the AATO check does not slip between return deadlines.
Key Takeaways
- The AATO amendment window for FY 2025-26 is open 1–31 July 2026; jurisdictional officers review amended figures 1–15 August 2026 (GSTN advisory dated 1 July 2026).
- The window moved from May to July this year, and AATO now updates automatically as you file later returns.
- AATO drives ₹5 crore obligations for the coming year: e-invoicing (Notification No. 10/2023-Central Tax dated 10 May 2023), QRMP eligibility, and 6-digit HSN reporting (Notification No. 78/2020-Central Tax dated 15 October 2020), plus GSTR-9/9C.
- An error hurts both ways — an inflated figure creates obligations you do not owe; a deflated one hides ones you do.
- Reconcile to your books before amending, keep the working, and use the Self-Service Portal for grievances.
Frequently Asked Questions
When can I amend my AATO for FY 2025-26?
Between 1 and 31 July 2026. This is the window set by the GSTN advisory dated 1 July 2026. Amended figures are then reviewed by your jurisdictional tax officer from 1 to 15 August 2026. Note the window moved from May (used up to FY 2024-25) to July this year.
Where do I see my AATO?
On your taxpayer dashboard after logging in at gst.gov.in. It is system-computed from your filed returns across all GSTINs on your PAN — you did not enter it, which is exactly why it can differ from your books.
Why does my AATO matter?
It decides several obligations for the coming year, most of which turn on ₹5 crore: e-invoicing (mandatory above ₹5 crore in any FY since 2017-18), QRMP eligibility (up to ₹5 crore), 6-digit vs 4-digit HSN reporting in GSTR-1, and whether you file GSTR-9/9C. An inaccurate figure can create or hide these obligations.
What if I miss the July window?
You lose the manual correction for FY 2025-26 for this cycle — the system-computed figure stands, and it will continue to update automatically as you file further returns. If the figure is materially wrong and causing a compliance issue, raise a grievance through the Self-Service Portal on gst.gov.in with your reconciliation.
Does amending AATO change my past returns?
No. Amending the AATO figure corrects the aggregate turnover the portal attributes to you; it does not amend the individual returns you have already filed. Errors inside specific returns are fixed through the normal amendment routes for those returns, not through the AATO functionality.
Disclaimer: This article is for informational purposes only and does not constitute professional tax advice. GST rules are subject to frequent changes through notifications, circulars, and GSTN advisories. Please consult a qualified tax professional or verify the current provisions on the official GST portal (gst.gov.in) before making any compliance decisions.
Not sure which side of ₹5 crore your turnover lands on, or how to support an AATO amendment? Our GST experts can help → gstconsultancy.com