IGST Act 2017 Explained: Provisions, Inter-state Supply Rules and Compliance

India’s Goods and Services Tax framework introduced a unified indirect tax system, and a critical pillar of this structure is the IGST Act 2017. Officially known as the Integrated GST Act 2017, this legislation governs taxation on interstate supplies of goods and services, imports, exports, and transactions involving Special Economic Zones (SEZs).

This article explains the core IGST provisions, taxation mechanisms, place of supply rules, export treatment, and emerging challenges, especially in digital and cloud-based services, while outlining how businesses can stay compliant.

IGST Act 2017

The Integrated GST Act 2017 was enacted to regulate taxation on supplies that cross state boundaries. Unlike intrastate transactions (where CGST and SGST apply), IGST is charged on interstate supplies and collected by the Central Government, which later distributes the revenue between the center and destination states.

The law ensures seamless tax credit flow across states and avoids cascading taxation, making India a unified market.

Levy and Collection of IGST

Under Section 5 of the IGST Act, integrated tax is levied on all interstate supplies of goods or services, except alcoholic liquor for human consumption.

Key highlights:

• IGST is charged on the transaction value determined under Section 15 of the CGST Act.
• The rate cannot exceed 40%, as notified by the government on GST Council recommendations.
• The tax is paid by the taxable person unless reverse charge provisions apply.
• Imported goods attract IGST at the time customs duties are levied under the Customs Act, 1962, read with the Customs Tariff Act, 1975.
• The government may notify specific categories under reverse charge.
• Certain services supplied via e–commerce platforms may require the electronic commerce operator to pay IGST.

Petroleum crude, diesel, petrol, natural gas, and aviation turbine fuel are notified separately.

For businesses dealing with imports, e–commerce, or reverse charge scenarios, professional advice from firms like TMWala can prevent compliance gaps and unnecessary tax exposure.

Inter-state Supply Under GST

An interstate supply occurs when the location of the supplier and the place of supply are in different states or union territories.

Interstate supply includes:

• Movement of goods from one state to another
• Import and export transactions
• Supplies to or from SEZ units
• Certain transactions are deemed interstate under the law

IGST is collected by the Central Government and apportioned between the Centre and the destination state, maintaining the destination–based taxation principle.

IGST Rate in India

IGST is essentially the sum of CGST and SGST. The standard slab structure is

Category	IGST Rate
Essential goods & educational services	5%
Processed food, mobiles, computers	12%
Capital goods, ice cream, pasta	18%
Luxury goods, automobiles, sin goods	28%

Rates are notified on recommendations of the GST Council and may change periodically.

Place of Supply Under IGST

The place of supply determines whether IGST applies and which state receives the revenue.

Broadly, IGST applies in:

• Interstate supplies
• Imports and exports
• SEZ transactions
• Supplies involving Export–Oriented Units (EOUs)

The destination principle ensures tax is levied where goods or services are consumed.

| Know more about Place Supply Under GST in India

IGST Applicability

IGST applies to all interstate transactions, including cross-border supplies.

• Imports: IGST is levied along with customs duties.
• Exports: Treated as zero-rated supplies.
• SEZ supplies: Always considered interstate, even if physically within the same state.

Proper classification is critical. Misidentification between intrastate and interstate supply can result in incorrect tax payment and denial of input credit, an area where TMWala frequently assists businesses through transaction reviews and GST structuring.

Zero-Rated Supply Under IGST

As per Section 16, zero–rated supplies include:

• Export of goods or services
• Supplies made to SEZ developers or units for authorised operations

In zero rating:

• Output supply is taxed at 0%.
• Input Tax Credit (ITC) remains available.
• Exporters may:
  • Pay IGST and claim a refund, or
  • Export under LUT/bond without payment of tax.

This mechanism ensures Indian exports remain globally competitive.

Section 7 of the IGST Act

Section 7 defines interstate supply. It covers situations where:

• The supplier and place of supply are in different states/UTs.
• Goods are imported into India until they cross customs frontiers.
• Supplies are made to or by SEZ units.
• Certain notified supplies are deemed interstate.

Correct classification under Section 7 is fundamental to determining the tax type.

Place of Supply Rules Under GST

The place of supply rules under GST are detailed in Sections 10 to 14 of the IGST Act:

• Section 10: Place of supply for domestic movement of goods
• Section 11: Import/export of goods
• Section 12: Domestic supply of services
• Section 13: Cross–border services
• Section 14: OIDAR services supplied from outside India

For goods, factors include movement, delivery location, and billing structure.
For services, considerations include recipient location, property location, event venue, transportation point, or place of performance.

Emerging Digital Challenges

When the IGST Act was enacted, distributed cloud computing, edge networks, and CDNs were not as dominant as they are today. A single cloud service may:

• Use servers across multiple states
• Operate via third–party colocation centres
• Serve customers nationwide simultaneously

Applying Sections 12 and 13 to such distributed digital services creates interpretational challenges regarding the actual place of supply.

This complexity particularly affects SaaS providers, fintech platforms, and digital infrastructure companies. Structured advisory from TMWala can help determine defensible tax positions aligned with evolving jurisprudence.

GST on Export of Goods and Services

Exports are treated as zero-rated supplies under GST.

Unlike the earlier regime, exporters no longer rely solely on duty drawback. Under GST:

• A refund is available for IGST paid on exports.
• ITC on inputs is claimable.
• The LUT mechanism enables exports without upfront tax payment.

This has simplified refund processes, though procedural compliance remains crucial.

Bill to Ship to Transaction

The bill-to-ship-to transaction is common in supply chains. It involves two parties:

1. Party A orders goods from the supplier.
2. The supplier ships directly to Party B as instructed by Party A.

Under GST:

• The person paying consideration is treated as the recipient.
• The place of supply is determined based on delivery instructions.
• Two supplies are recognized for taxation purposes.

Improper documentation in such transactions often leads to disputes in place of supply and ITC claims. Professional structuring ensures seamless credit flow.

GST Credit Utilisation Rules

Input Tax Credit utilization follows a prescribed order:

• IGST credit is first used against IGST liability.
• Remaining IGST credit may be used for CGST and SGST.
• CGST credit cannot be used against SGST and vice versa (except through IGST mechanism).

Proper credit planning optimizes working capital and avoids cash outflows.

Businesses dealing with multi–state operations, imports, and digital services should periodically review credit utilization patterns to avoid accumulation or mismatches.

Conclusion

The IGST Act 2017 forms the backbone of India’s interstate GST framework. It ensures seamless taxation across state borders while preserving the destination–based principle.

From levy mechanisms and zero–rated exports to place of supply complexities and evolving digital taxation challenges, compliance under IGST requires both technical clarity and strategic planning.

As commerce becomes increasingly digital and multi-jurisdictional, expert interpretation of IGST provisions is no longer optional; it is essential. With evolving regulatory interpretations and growing scrutiny, advisory support from experienced professionals like TMWala can help businesses remain compliant, efficient, and audit-ready.

FAQs

1. What is IGST Act 2017?
   It governs taxation on inter-state supplies, imports, exports, and SEZ transactions.
2. When is IGST charged?
   On inter-state supplies of goods and services.
3. What is inter-state supply?
   When supplier and place of supply are in different states/UTs.
4. What are IGST rates?
   5%, 12%, 18%, and 28%.
5. Is IGST applicable on imports?
   Yes, along with customs duties.
6. Are exports taxable under IGST?
   Exports are zero–rated supplies.
7. What is zero rated supply?
   Exports and supplies to SEZ units/developers.
8. What determines IGST applicability?
   Place of supply rules under GST.
9. What is bill to ship to transaction?
   Goods billed to one party but shipped to another.
10. How is IGST credit utilised?
    First for IGST, then CGST and SGST.