AATO Under GST (2026): Meaning, Full Form & How to Calculate

What is Annual Aggregate Turnover (AATO)?

The term AATO, according to Section 2(6) of the CGST Act 2017, represents the total value of all taxable supplies together with exempt supplies and export activities and inter-state supplies which a person with a single PAN registers throughout India, except for GST and reverse charge taxable inward supplies.

In plain terms, it is your total sales across India in a financial year, before cost deductions, but after removing the GST component.

AATO Formula: How to Calculate Your Annual Aggregate Turnover

AATO = Taxable Supplies + Exempt Supplies + Zero-Rated Exports + Inter-State Supplies

       (All calculated across India, under the same PAN, excluding GST taxes)

Step-by-step:

1. Add all taxable sales (at any GST rate - 0%, 5%, 18%, 40%)
2. Add exempt supplies (fresh produce, healthcare, recognised educational services)
3. Add export value, even though GST is not charged on exports
4. Add all inter-state supplies
5. Subtract GST collected from each invoice
6. Deduct sales returns (credit notes issued)

Example: You sell goods for ₹11,800, including 18% GST → your AATO contribution is ₹10,000, not ₹11,800.

What to Exclude

• Inward supplies are taxable under reverse charge
• Central GST, State GST, IGST, UTGST, and Cess

What to Enter as AATO During Selected Financial Year on GST Portal

When registering on the GST portal, you will see a field: "Enter AATO during selected financial year (in Rs Crores)". Here is exactly what to do:

• Select the financial year in which your turnover first crossed or is likely to cross the threshold
• Enter the total of all supplies under your PAN for that year, taxable + exempt + exports
• Exclude GST from the figure (enter ex-GST value only)
• If just starting out, enter your estimated turnover for the current financial year
• The figure should be in crores (e.g., ₹45 lakh = 0.45 crores)

This is one of the most common points of confusion during GST registration. If you are unsure, a GST professional can verify the correct figure before submission

Components of Annual Aggregate Turnover: What Gets Included?

For the exact calculation, it is necessary to know what contributes to your AATO. Thus, let’s analyze each thing in detail.

Taxable Supplies: The Core Component

Taxable supplies are a key component of your Annual Aggregate Turnover (AATO) calculation. All supplies of goods or services that are subject to GST at any rate, which could be 5%, 12%, 18%, or 28%, are included in the calculation. This includes your ongoing business sales, whether or not an invoice is issued.

For example, if you own a cafe, your food sales would be classified as taxable supplies. If you are a consultant, charges for your services would be counted as taxable supplies. The full sales value of your goods, which are only taxed at 5% GST, still counts towards AATO.

Exempt Supplies: Often Overlooked But Critical

Many businesses mistakenly believe that AATO should be calculated for non-exempt supplies. Fresh fruits and vegetables, educational services from reputable institutions, and healthcare services from clinical locations are examples of exempt supplies that should be included in your turnover calculation.

The fact that such items are often included randomly is illustrated by the example of a coaching institute owner who provides exempt educational services worth ₹1.5 million annually and also sells taxable books worth ₹5 million, whose AATO is ₹2 million instead of ₹5 million.

Export of Goods and Services: Zero-Rated but Counted

Under GST, exports are considered zero-rated supplies, meaning they are not subject to GST. However, the total value of your exports is included in your AATO. This is crucial for businesses that supply to foreign markets and don't earn GST on most of their sales, yet may still have a significant turnover.

For example, an exporter who ships goods worth ₹5 million to international markets and sells goods worth ₹1 million locally would have an AATO of ₹6 million, even if they charge GST only on domestic sales.

Inter-State Supplies: Capturing the Entire Picture

AATO should include all your supplies to other states, whether they are taxable, exempt, or zero-rated. This ensures that your entire business activity in India is reflected in a single metric.

What You Should Exclude from AATO

It is just as important to know what should not be included as it is to know what should be included. You should not count the value of inward supplies on which tax is paid under reverse charge mechanism. Moreover, you should not include the central GST, state GST, union territory GST, integrated GST, and cess charged under the GST law in your turnover. You determine Annual Aggregate Turnover (AATO) based on the value of supplies without GST.

For instance, if you sell goods for 11,800 rupees including 18% GST, your turnover for AATO is 10,000 rupees, not 11,800 rupees.

GST Registration Thresholds Based on AATO in 2026

The aggregate limits for GST registration are directly linked to your AATO, and they vary for different types of businesses and locations.

Standard Threshold Limits

In the case of мost businesses сonsisting in gоods supplуing, the limit of AATO for GST registration is 40 lakh rupees. So if your аnnual aggregаte turnоver is more than 40 lakh rupees, you hаve to apply fоr GST within 30 days after the threshold has been crossed. 

For the service providers, the same 40 lakh rupee threshold is valid in most of the states. But here geography has a major impact.

Special Category States: Different Rules Apply

Firms in special category states can qualify for a more flexible limit of ₹20 Lakh for both sales of goods and services. These special category states in 2026 are as follows:

1. Arunachal Pradesh
2. Assam
3. Jammu and Kashmir
4. Manipur
5. Meghalaya
6. Mizoram
7. Nagaland
8. Sikkim
9. Tripura
10. Himachal Pradesh
11. Uttarakhand.

If you own a small guesthouse in Shimla with an annual turnover of ₹25 Lakh, you will need to register for GST. However, in Mumbai, a similar business will only need to register after reaching a turnover of ₹40 Lakh.

Compulsory Registration Regardless of Turnover

Some businesses must register even below the threshold: interstate suppliers, e-commerce sellers, reverse charge taxpayers, non-resident taxable persons, and those required to deduct/collect TDS or TCS.

GST Composition Scheme Eligibility and AATO

The GST Composition Scheme is a simplified compliance mechanism available for small businesses; however, the eligibility is strictly controlled by Annual Aggregate Turnover (AATO) limits.

Current Composition Scheme Limits

In 2026, companies with AATO of ₹15 Lakh and below are eligible for the GST composition scheme. This includes manufacturers, traders, and restaurant service providers. For service providers other than restaurant services, the limit is ₹75 Lakh.

The composition scheme allows for tax payment at a lower rate (1% for traders and manufacturers, 5% for restaurants) without the hassle of input tax credit calculations and extensive invoicing requirements.

When Composition Scheme Make Sense?

For a small retailer with an annual turnover of ₹80 lakh, the composition scheme significantly reduces the compliance burden. Instead of maintaining detailed records of every input and output, you simply need to pay 1% tax on your turnover and file quarterly returns instead of monthly.

However, this scheme also has some limitations. You are not allowed to make inter-state supplies, claim input tax credit, or sell goods through e-commerce platforms. Additionally, you must affix a "Composition Taxable Person" sign at your place of business and on all your bills of supply.

Calculating AATO: Practical Examples for Different Business Scenarios

Let's look at some real-life scenarios to better understand the AATO calculation.

Example 1: Retail Business with Supplies of Different Natures

Ramesh runs a general store in Bangalore. The financial statements of his business for 2025-26 show:

• Taxable Sales of Groceries and Household Items: 35 lakh rupees (GST not included)
• Exempt Sales of Fresh Vegetables and Fruits: 8 lakh rupees
• Sales Returns: 2 lakh rupees

Thus, his AATO computation will be: 35 lakh (taxable) + 8 lakh (exempt) - 2 lakh (returns) = 41 lakh rupees.

Since Ramesh's AATO (Annual Aggregate Turnover) is more than 40 lakh rupees, he is obliged to register for GST. If his turnover had been 38 lakh rupees instead, he could have continued without registration, although voluntary registration would still be available as an option.

Example 2: Service Provider with Export Income

In Pune, Priya is operating a software development consultancy. Her total earnings for the year 2025-26 comprise:

• Domestic Consulting Services: 25 lakh rupees (GST exclusive)
• Export of IT Services to US Clients: 40 lakh rupees
• Disposal of used Office Furniture: 3 lakh rupees (GST exclusive)

Thus, her annual AATO turns out to be 25 lakh (local services) plus 40 lakh (exports) plus 3 lakh (equipment) = 68 lakh rupees.

Though at the same time, Priya's income from all domestic taxable sales is only 25 lakh rupees, and her total AATO of 68 lakh rupees forces her to get GST registration. Besides, because of her supply to overseas clients, she might also have to get registered under the Letter of Undertaking (LUT) for exports.

Example 3: Multi-Location Business Under Same PAN

Vikram has three retail stores located in different cities, all of which are under his single PAN:

• Store in Mumbai: 28 Lakh rupees turnover
• Store in Delhi: 22 Lakh rupees turnover
• Store in Kolkata: 18 Lakh rupees turnover

For AATO (Aggregate Annual Turnover) computation, you need to sum up the turnover from all the centers with the same PAN: 28 + 22 + 18 = 68 Lakh rupees.

Although no individual location surpasses the 40 lakh rupees limit, Vikram still has to get a GST registration because his total turnover across India is 68 lakh rupees. This is a typical pitfall for businesses that are expanding into various locations.

AATO and Its Impact on Various GST Provisions

Your AATO impacts a lot of things regarding GST compliance; at the same time, this is a factor to consider at the time of registration as well.

Quarterly Return Filing Eligibility (QRMP Scheme)

AATOs under ₹5 crore (approximately $1.5 million) fall into the category of small taxpayers eligible for the QRMP scheme. This is a significant opportunity as it allows for quarterly filing of returns instead of monthly, but the tax payment process remains monthly. For AATOs between ₹15 million and ₹5 crore (approximately $1.5 million), this provides significant relief in compliance and maintains tax payment discipline.

E-Invoicing Requirements

In 2026, a new era will begin for businesses with an AAT of over ₹5 crore (approximately $1.5 billion USD) that will now be required to issue e-invoices for their B2B transactions. The threshold for e-invoicing has been steadily reduced; now, only very large companies are able to comply. If your annual sales are approaching this threshold, it's best to prepare your systems for e-invoicing.

Audit Requirements Under GST

A GST audit is not mandatory for all registered persons, but businesses with a turnover of more than ₹5 crore must have their accounts audited by a chartered accountant or cost accountant. An audit checks whether your GST returns are in sync with your financial records and whether you've applied GST provisions correctly.

Recent Changes and Updates for 2026

The GST system is still changing, and thus, it is very important to be aware of the changes for compliance purposes.

Increased Scrutiny Through Data Analytics

The GST Network has tremendously improved its data analytics competency in the year 2026. The system now automatically identifies cases of disparity between GSTR-1 (outgoing supplies) and GSTR-3B (summary return), between your reported sales and your e-way bill generation patterns, and between your purchases as shown in GSTR-2A/2B and your claimed input tax credit.

It is a must for businesses to have their AATO reporting done in an accurate and consistent manner across all returns and documents. The period of minor mistakes going unnoticed is more or less over.

Simplified Return Systems Stabilizing

The return filing system has stabilized in 2026 after a few years of transition. The SMS (Sahaj) and Sugam return forms for composition taxpayers and small taxpayers have been improved by taking feedback into account, thus making compliance easier for those exceeding the higher turnover thresholds.

Emphasis on Digital Compliance

The government is still promoting digital compliance. Businesses that are close to or over the threshold should buy GST-compliant billing and accounting software. As your turnover increases, manual compliance becomes more and more risky and time-consuming.

Conclusion:

Getting AATO right is the foundation of GST compliance; it determines your registration obligation, scheme eligibility, and filing requirements. The key rules: combine all supplies under your PAN, include exempt and export income, exclude GST from the figure, and recalculate every financial year. As enforcement tightens in 2026 with automated data matching, accuracy is no longer optional.

Don't risk penalties or compliance issues. Get your GST registration done right with JustStart today.

Frequently Asked Questions

Q1. Is AATO reset every financial year?

Yes. AATO is calculated separately for each financial year (April 1 to March 31). However, once registered, you remain registered even if turnover drops below the threshold in a later year, unless you apply for cancellation.

Q2. Do discounts reduce AATO?

Trade discounts shown on the invoice at the time of supply reduce turnover. Post-supply discounts issued via credit notes are adjusted in the period the credit note is issued, not the original supply period.

Q3. What about casual taxable persons?

Casual taxable persons, those who carry out transactions periodically without a fixed place of business, must register for GST regardless of their turnover. The AATO threshold does not apply to them.

Q4. Should I include my exempt income while deciding whether to register?

Yes, and this is frequently overlooked. Exempt supplies, such as fresh produce or certain educational services, are fully included in AATO. A coaching centre earning ₹15 lakh from exempt tuition and ₹5 lakh from taxable books has an AATO of ₹20 lakh, not ₹5 lakh.

Q5. I sell only within my state. Do I still need to aggregate turnover across all locations?

Yes, AATO is PAN-based and covers all business activity under the same PAN across India, regardless of whether supplies are intra-state or inter-state. Multiple locations under one PAN are always combined.

Q6. What is the difference between turnover and aggregate turnover in GST?

"Turnover" typically refers to sales at a single location or entity level. "Aggregate turnover" under GST includes all supplies, taxable, exempt, and exported, across every state, under the same PAN. It is always a broader figure.

Q7. Our AATO just crossed the threshold this month. How long do we have to register?

You must apply for GST registration within 30 days from the date your AATO crosses the applicable threshold. Operating without registration after this window attracts a penalty of up to 10% of the tax due, plus interest.

Q8. Can I voluntarily register for GST even if my AATO is below the threshold?

Yes, Voluntary registration is allowed and can be beneficial if you supply to GST-registered businesses (who need to claim input tax credit) or if you intend to scale up. Once voluntarily registered, you are subject to all standard GST compliance obligations.