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GST Interstate vs GST Intrastate

5paisa Research Team

Last Updated: 09 May, 2025 12:43 PM IST

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The introduction of the Goods and Services Tax (GST) on 1st July 2017 marked a transformative shift in India's taxation system. By consolidating multiple indirect taxes into one, GST streamlined tax collection, improved compliance, and reduced tax cascading. However, an essential distinction within GST is between Interstate GST (IGST) and Intrastate GST (CGST + SGST). Understanding the difference between these two categories is crucial for businesses to ensure accurate tax computation, seamless compliance, and efficient tax credit utilisation.

This article explores the meaning, applicability, rates, and key differences between Interstate GST and Intrastate GST, ensuring clarity for business owners, accountants, and tax professionals.
 

Understanding Interstate and Intrastate GST

Under GST law, the classification of transactions as Interstate or Intrastate is determined by the location of the supplier and the place of supply. The correct classification dictates which type of GST—IGST, CGST, or SGST—should be applied to a transaction.
 

What is Interstate GST?

Interstate supply refers to transactions where the supplier and the recipient are located in different states or union territories. In such cases, Integrated GST (IGST) is levied by the Central Government.

Key Characteristics of Interstate GST:

  • The supplier and recipient are in different states or union territories.
  • IGST is applied instead of CGST and SGST.
  • The Central Government collects IGST and distributes it to the state where the goods or services are consumed.
  • Transactions involving Special Economic Zones (SEZs), exports, and imports are treated as Interstate supplies.

Example of an Interstate Supply:

  • Company A in Maharashtra sells goods worth ₹1,00,000 to Company B in Karnataka.
  • The GST rate on the product is 18%.
  • IGST payable: ₹1,00,000 × 18% = ₹18,000.
  • ₹18,000 IGST is collected by the Central Government, which later distributes a share to Karnataka.
     

What is Intrastate GST?

Intrastate supply refers to transactions where the supplier and recipient are located in the same state or union territory. In this case, Central GST (CGST) and State GST (SGST) are applied.

Key Characteristics of Intrastate GST:

  • The supplier and recipient are in the same state or union territory.
  • CGST and SGST are levied equally, and the total tax remains the same as IGST.
  • The Central Government collects CGST, while the State Government collects SGST.
  • Businesses need to charge both CGST and SGST on invoices.

Example of an Intrastate Supply:

  • Company X in Delhi sells goods worth ₹2,00,000 to Company Y, also in Delhi.
  • The GST rate on the product is 18%.
  • CGST: ₹2,00,000 × 9% = ₹18,000.
  • SGST: ₹2,00,000 × 9% = ₹18,000.
  • The total tax paid remains ₹36,000, but it is split between the Central and State Governments.

Differences Between Interstate and Intrastate GST

Parameter Interstate GST (IGST) Intrastate GST (CGST + SGST)
Definition Supply of goods/services between different states or union territories. Supply of goods/services within the same state or union territory.
Applicable Tax IGST CGST and SGST (split equally).
Levied By Central Government Central and State Governments.
Revenue Distribution IGST collected is shared between the Centre and the destination state. CGST goes to the Central Government, and SGST goes to the State Government.
GST Rate The full GST rate is charged as IGST. The GST rate is split equally as CGST and SGST.
Place of Supply Different from the supplier’s location. Same as the supplier’s location.
Input Tax Credit (ITC) ITC on IGST can be used to set off IGST, CGST, and SGST liabilities. ITC on CGST can be used against CGST and IGST, while ITC on SGST can be used against SGST and IGST (cross-utilisation between CGST and SGST is not allowed).
Example Goods are supplied from Maharashtra to Karnataka. Goods are supplied within Maharashtra.

 

Impact on Businesses

Understanding Interstate vs Intrastate GST is crucial for businesses to ensure proper tax collection, compliance, and efficient tax credit utilisation. Here’s how it affects businesses:

Correct Tax Calculation

  • Misclassifying an Intrastate transaction as Interstate (or vice versa) can lead to incorrect tax filings and compliance issues.
  • Businesses must determine the correct GST type based on the place of supply rules.

Input Tax Credit (ITC) Utilisation

  • IGST credit can be used to set off IGST, CGST, and SGST.
  • CGST credit can only be used for CGST and IGST.
  • SGST credit can only be used for SGST and IGST.
  • Businesses need to ensure proper matching and reporting of ITC to avoid losses.

Invoice Compliance

  • Interstate invoices must mention IGST, while Intrastate invoices must mention CGST and SGST.
  • Incorrect invoicing can lead to penalties and rejection of ITC claims.

GST Return Filing

  • Businesses must report IGST separately for Interstate transactions and CGST & SGST separately for Intrastate transactions in GST returns (GSTR-1, GSTR-3B, etc.).
  • Errors in classification can lead to mismatches and notices from tax authorities.
     

Conclusion

The distinction between Interstate and Intrastate GST is fundamental for businesses operating across different states in India. While Interstate transactions attract IGST, Intrastate transactions require the collection of CGST and SGST. Proper classification ensures accurate tax payments, smooth GST return filing, and efficient ITC utilisation.

With evolving GST rules and compliance requirements, businesses must stay updated with GST regulations and use technology-driven solutions to automate tax calculations, invoicing, and return filing.

For seamless GST compliance, businesses should:

  • Maintain accurate records of Interstate and Intrastate transactions.
  • Ensure correct tax classification for smooth GST filing.
  • Leverage GST software to automate tax computation and invoice generation.
  • Keep track of Input Tax Credit (ITC) for better tax efficiency.

By understanding the nuances of Interstate and Intrastate GST, businesses can optimise tax planning, prevent compliance errors, and improve financial efficiency in the GST regime.
 

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Frequently Asked Questions

Yes, businesses can claim Input Tax Credit (ITC) on IGST paid for interstate purchases. This ITC can be used to offset IGST, CGST, or SGST liabilities in a specific order as per GST rules.

If the place of supply is different from the supplier’s location, IGST applies. However, if billing and delivery happen within the same state, CGST and SGST are levied, regardless of the supplier’s state.

An e-commerce seller must charge IGST for interstate supplies and CGST & SGST for intrastate supplies. The GST treatment depends on the buyer’s location and the place of supply.
 

For services, the place of supply determines whether IGST or CGST & SGST are applicable. If the recipient is in another state, IGST applies; if within the same state, CGST and SGST are charged.

If IGST is charged instead of CGST & SGST (or vice versa), businesses must rectify it in their GST returns. Incorrect tax collection can lead to compliance issues and difficulty in claiming ITC.

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