What is IGST in GST? Full Form, Meaning, Calculation & Refund Guide

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Do you know which tax applies when a manufacturer in Mumbai ships goods to a retailer in Delhi?

Yes, it’s IGST.

A part of the GST regime, the IGST or Integrated Goods and Services Tax is critical for processing taxation on goods and services between states. IGST is meant to optimise business proceedings and deals between two entities residing in different states.

Instead of splitting taxes between states at the point of sale, IGST streamlines the process under a single levy.

One of the three core layers of the GST system in India, in this article, we will discuss what is IGST, its key rules, and applicable sections.

What is IGST Full Form and Meaning?

Full form of IGST is Integrated Goods and Services Tax and its levied and collected on the supply of goods and services between two states within India. On ground, IGST is the combination of CGST and SGST. But the apportionment of the tax revenue collected from IGST is different from SGST.

A core difference between SGST, CGST, and IGST is that the latter applies to interstate supply of goods and services, whereas the former taxes supply of goods and services within one state.

Operationalised by the IGST Act, 2017 which is a part of the GST law, the IGST replaces Central Sales Tax (CST) and is now a critical component in creating a uniform and seamless taxation mechanism across the country.

But who collects and governs the IGST?

Central Board of Indirect Taxes and Customs (CBIC) is responsible for governing and collecting tax proceeds from the IGST.

But the central board or the central government, for that matter, does not keep all the proceeds from the IGST collection. After collection, the proceeds are later apportioned to the destination state.

Also read: What is CGST? Full Form, Meaning and Key CGST Act Explained

What is IGST under GST – Three Component Framework

India’s GST system is built on a dual model with three core components: CGST, SGST, and IGST. The Goods and Services Tax ensures that tax is applied consistently, whether a transaction happens within a state or across state borders.

Tax rate wise, IGST is the sum of CGST and SGST. This means the total tax incidence reminds the same of the businesses and individuals, the difference is only in who collects and distributes the taxes.

But why was IGST drafted and executed? Primarily it was to fix the inefficiencies in the earlier Central Sales Tax system which did not allow for input tax credit leading to cascading taxes and higher costs.

Tax	Applicable When	Collected By	Revenue Goes To
CGST	Within same state (intra-state)	Central Government	Central Government
SGST	Within same state (intra-state)	State Government	Respective State Government
IGST	Between states (interstate)	Central Government	Shared between Centre & State
UTGST	Within Union Territories	Central Government	Respective Union Territory

This structure is built to ensure the credit flow is seamless and to address the tax-on-tax issues. Today IGST is a critical link in India’s unified tax framework helping businesses and the government set the right precedents from when the goods or services are delivered and where they are delivered.

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What is Inter-State and Intra-State under the GST Regime?

Inter-State Supply – Section 7 of the IGST Act

As per Section 7 of the IGST Act, 2017, a supply is classified as interstate when the location of the supplier and the place of supply are in different states or Union Territories. Such transactions attract IGST.

Interstate supply also includes;

Imports into India
Exports from India
Supplying goods to or getting them from SEZ units (even within same state)
Notified transactions involving EOUs

What is Intra-State Supply? – Section 8 of the IGST Act

Under Section 8 of the IGST Act, 2017, a supply is intra-state when the supplier’s location and place of supply are within the same state or Union Territory. These transactions attract CGST + SGST, not IGST.

Parameter	Inter-State Supply	Intra-State Supply
Supplier & Place of Supply	Different states/UT’s	Same state/UT
Tax Applicable	IGST	CGST + SGST
Collected By	Central Government	Centre (CGST) + State (SGST)
Revenue Destination	Shared between Centre & destination state	Split between Centre & origin state
SEZ Treatment	Always interstate (IGST applies)	Not applicable
Example Transaction	Mumbai → Bengaluru	Delhi → Delhi

Place of Supply Rules Under IGST | Identify Where Tax Applies

Place of Supply is the key component of IGST, and it determines which state will receive the tax revenue. Following the GST system, taxation is based on the destination. This means the tax accrues where the goods or services rendered by businesses or individuals are actually consumed and not where they are delivered from.

Under the Place of Supply framework, we need to under the IGST meaning from four sections;

Place of Supply of Goods – Domestic Governed by Section 10

Under Section 10 of the IGST Act, the place of supply is referred to the location where goods are delivered to the recipient. Hence, this rule puts taxation to the point of consumption.

But few service transactions or supply of goods can modify this principle;

Bill-to-ship-to model: When goods are delivered to a third party on the buyer’s instructions, the place of supply is the buyer’s location, not the delivery location.

For instance, a retailer asks the distributor to deliver the goods to Lucknow, but the retailer works in Mumbai. In this case, the IGST will be applicable at Mumbai and not Lucknow.

Installation or assembly at site: POS is the location where installation is carried out.
Goods on board a conveyance (e.g., aircraft/train): POS is the place of departure of the conveyance.

Place of Supply of Goods — Imports and Exports (Section 11)

In Section 11 of the IGST Act, 2017 the place of supply the POS rules for intra-state supply of goods or services governs taxation aligns with destination-based GST model.

Import of Goods: Here, the place of supply is the location of importers in India. For these transactions, interstate rules apply and the IGST is levied along with the customs duty at the time of import.
Export of Goods: When the place of supply is outside India, no GST is applicable making them “zero-rated supplies”. However, businesses that have paid taxes on inputs can claim Input Tax Credit (ITC) or refunds.

Place of Supply of Services – Domestic (Section 12)

The Section 12 of the IGST Act 2017 defines the taxation of supply of services whether it’s a B2B or B2C transaction. The general rule for B2B transactions is that the POS is the location of registered recipients.

With B2C transactions, the POS is the location of the recipient, but if that cannot be determined, the POS defaults to the location of the supplier. But there are some exceptions to where POS applies here;

For immovable property services, the POS applies to the property location.
For event-based services, POS applies to where the event is held.
For restaurants and catering services, POS is where the services are actually performing.
For telecom services, POS applies to the location where the connection is installed, or the SIM is registered.

Place of Supply of Services — Cross-Border (Section 13)

Section 13 of the IGST Act, 2017 is applicable in situations when the supplier or the recipient of services is located outside India. This section clears any confusion related to whether the transaction is taxable in India or not, and if yes, where IGST applies.

In general, the POS for transactions under Section 13 is the location of the recipient. If the recipient resides in India, the supply is taxable under IGST. However, there are some exceptions;

For services where physical presence is required, the POS is where the services are actually rendered.

For Indian businesses using global tools such as SaaS platforms, software subscriptions, or digital advertising from foreign vendors, the POS is usually India, generally the recipient’s location.

In such cases, IGST is payable under the Reverse Charge Mechanism (RCM), making compliance essential for cross-border service consumption.

IGST Rates in India (Latest GST Slabs)

IGST rates follow the standard GST slab structure while focusing on uniformity across India. This means, there is no state-wise variation for IGST rates in India. The applicable slabs to IGST are;

0% – on essential goods
0.25% & 3% – Precious stones and Metals
5% – Mass consumption goods
12% & 18% – Standard goods and services
28% – Luxury and Sin goods

IGST Calculation with Example

Inter-State B2B Sale	Intra-State Comparison	Import Calculation
Seller in Bengaluru & Buyer in Delhi Value of goods = ₹50,000 IGST @ 18% IGST = ₹9,000 Invoice total = ₹59,000 Tax flow: ₹9,000 is collected by the Central Government, and the destination state (Delhi) receives its share (₹4,500).	Same goods sold within Karnataka CGST @ 9% + SGST @ 9% CGST = ₹4,500 + SGST = ₹4,500 = ₹9,000 total Total tax burden is identical to IGST (₹9,000), but the collection and distribution mechanism differs.	Assessable Value (AV) = ₹1,00,000 Basic Customs Duty (BCD) @ 10% = ₹10,000 Education Cess @ 3% on BCD = ₹300 IGST Base = ₹1,10,300 IGST @ 18% = ₹19,854 IGST is calculated on a value that includes customs duties, increasing the effective tax base for imports.

Input Tax Credit Under the IGST Rules

Input Tax Credit (ITC) offers businesses an easy way out and saves on taxes as they can offset the amount of tax paid on purchasing goods or services. ITC eliminates tax on tax or the cascading of taxes reducing a business owner’s overall liability under GST.

Under Rule 88A of the CGST Rules, 2017 credit utilisation under IGST must follow a mandatory order.

First and foremost, set off the tax against IGST liability.
Then remaining credit can be used to pay off CGST and SGST.

A key advantage of the IGST credit can be used to pay IGST, CGST, and SGST. However, note that CGST credit cannot be used to pay SGST and similarly SGST cannot be used to pay CGST.

IGST Refund Process- When & How to Claim

The key scenarios where IGST refund is applicable where the tax has not been paid, but it’s ultimately due. Some common scenarios, include;

Zero rated supplies (exports)
Supplies to SEZ units or developers
Inverted duty structure
Excess tax payment

Now to process your IGST refund, there are two routes;

Export with IGST Payment: When IGST is paid on exports, the shipping bill itself acts as the refund application. Once returns are filed (GSTR-1 and GSTR-3B), the refund is auto-processed by Customs.
Export Under LUT (Without IGST Payment): This is when businesses export under LUT (Letter of Undertaking) and they can claim refund on the accumulated ITC. For this, businesses need to file RFD-01 on the GST portal.

There’s a time limit to apply for a refund, which is 2 years and the refunds take around 60 days to process. And the documents needed for the same are;

GSTR-1 and GSTR-3B
Shipping bill / Export General Manifest (EGM)
FIRC/BRC (for export of services)
RFD-01 (for LUT refunds)

You can also track refunds through the GST portal. Login to your GST portal, go to Refunds, and check the Track Application Status page.

IGST Return Filing (GSTR Forms)

There is no separate return to be filed for IGST, the proceedings and transactions under IGST are reported with standard GST returns. It rests on the businesses to disclose interstate transactions to ensure correct tax payment and credit flow.

Key Returns to File for IGST Reporting

GSTR-1 (Outward Supplies): Details of interstate sales (B2B, B2C, exports) where IGST is charged.

GSTR-1 is filed on the 11th of every month for the previous month.
GSTR-3B (Summary Return): Consolidated tax liability, including IGST payable and ITC claimed.

GSTR-3B is filed on the 20th of every month for the previous month.

GSTR-2B (Auto-generated): Reflects eligible ITC, including IGST paid on purchases and imports.

Conclusion

IGST is more than just a tax on interstate transactions; it is the mechanism that keeps India’s GST system seamless, ensuring smooth credit flow, eliminating cascading taxes, and enabling businesses to operate across state borders without friction.

From determining the correct place of supply to managing ITC utilisation and refunds, getting IGST right has a direct impact on compliance, cash flow, and overall profitability.

For growing businesses, especially those handling multi-state transactions or cross-border payments, manual handling of GST complexities can quickly become a bottleneck.

This is where Cashfree can help. With automated payment workflows, smart reconciliation, and GST-ready reporting, Cashfree simplifies how you manage transactions and stay compliant.

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FAQs on IGST

What is IGST in simple words?

IGST is a tax charged when goods or services are sold from one state to another in India.

What is the full form of IGST?

IGST stands for Integrated Goods and Services Tax.

What is the difference between IGST and CGST?

CGST and SGST are levied on transactions where goods and services are given with the same state. But IGST is applicable to the supply of goods and services between different states.

Do we get an IGST refund?

Yes, refunds are given to businesses under IGST, and it happens in two ways. Either by claiming the refund of the IGST paid on exports or by claiming Input Tax Credits (ITC) on inputs where taxes are paid for zero-rated GST supplies.

Who will collect IGST?

IGST is collected by the central government, but it is later distributed between the origin and destination states.

What are the key benefits of IGST for businesses?

Businesses under IGST benefit from the reduction in tax-related complications on interstate transactions. The uniform tax rate ensures there is no tax on tax system as it was in the previous central sales tax regime.

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