GST on Imports in India: How IGST on Customs Duty Is Calculated & ITC Eligibility

GST on imports refers to the Integrated Goods and Services Tax (IGST) charged on goods and services entering India from another country. Imported goods are treated as inter-state supplies under the IGST Act, meaning IGST is collected during customs clearance in addition to applicable customs duties. Eligible businesses can claim the IGST paid as Input Tax Credit (ITC), helping reduce their overall GST liability.

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Each time goods enter India from another country, taxation occurs, and with the implementation of GST in 2017, there have been some changes in terms of the structure of such taxes. There is custom duty, but there is also an additional layer of IGST, which is computed cumulatively based on the custom duty.

This poses quite a challenging situation to importers, but once the principles of calculation are understood, everything becomes much easier. This section covers IGST on imported goods, qualification for Input Tax Credit, import of services, and implications of new GST notifications from September 2025.

What Is GST on Imports? How IGST Applies to Imported Goods

All goods imported into India are subject to Integrated Goods and Services Tax (IGST) under the Goods and Services Tax (GST) framework. Unlike domestic transactions, where GST is split into CGST and SGST (or IGST for inter-state supplies), imports are always treated as inter-state supplies under the Integrated Goods and Services Tax (IGST) Act, 2017. As a result, IGST is collected by customs authorities at the time of customs clearance, along with applicable customs duties.

The objective of charging IGST on imports is to ensure tax neutrality between imported and domestically manufactured goods. Since similar products sold within India are already subject to GST, imported goods are taxed at the same applicable GST rate to create a level playing field for domestic businesses.

How the Import Tax Structure Changed After GST

Before the implementation of GST in July 2017, importers were required to pay multiple indirect taxes on imported goods, including:

• Basic Customs Duty (BCD)
• Countervailing Duty (CVD)
• Special Additional Duty (SAD)

With the introduction of GST:

• Countervailing Duty (CVD) and Special Additional Duty (SAD) were subsumed into Integrated GST (IGST).
• Basic Customs Duty (BCD) continues to be levied under the Customs Act and remains payable on imported goods.
• Social Welfare Surcharge (SWS), where applicable, is calculated as a percentage of BCD.
• IGST is then calculated on the cumulative taxable value, which includes the assessable value, BCD, and applicable surcharge.

This simplified the indirect tax structure while allowing eligible businesses to claim Input Tax Credit (ITC) on the IGST paid during import.

Types of Taxes Applicable on Imported Goods

Tax	Purpose	ITC Available?
Basic Customs Duty (BCD)	Customs duty levied under the Customs Act	No
Social Welfare Surcharge (SWS)	Surcharge calculated on BCD	No
Integrated GST (IGST)	GST charged on imported goods	Yes, subject to eligibility

Key Point: While IGST can generally be claimed as Input Tax Credit (ITC) by eligible GST-registered businesses, BCD and SWS become part of the import cost and cannot be claimed as GST credit.

Why Is IGST Charged on Imported Goods?

IGST is charged on imports to ensure that imported goods are taxed in the same manner as goods supplied within India. Without IGST, imported products could gain a pricing advantage over domestically manufactured goods, leading to an uneven tax structure.

Charging IGST on imports also maintains the continuity of the GST credit chain. Businesses that import goods for further supply, manufacturing, or commercial use can generally claim the IGST paid at customs as Input Tax Credit, preventing tax cascading and reducing the overall tax burden.

How IGST on Imports Is Calculated: Formula, Components & Example

IGST on imports does not apply to just the declared invoice price. The taxable base is built in layers, which is the part most importers find confusing. Below is the standard calculation structure:

Component	Description
Assessable Value	CIF value (Cost + Insurance + Freight) converted to INR
Basic Customs Duty (BCD)	Applied on the assessable value
Social Welfare Surcharge (SWS)	10% of BCD
IGST Taxable Value	The cumulative base on which IGST applies
IGST Rate	Rate applicable to the goods
IGST Payable	Final IGST amount due

IGST Calculation Formula

Why Isn’t IGST Calculated Only on the Invoice Value?

Many first-time importers assume that IGST applies only to the declared value of the goods. However, customs valuation rules require IGST to be calculated on the aggregate import value, which includes applicable customs duties and surcharges.

This methodology ensures:

• Uniform taxation of imported and domestic goods.
• Consistent customs valuation practices.
• Proper calculation of Input Tax Credit.
• Prevention of undervaluation during imports.

Common Mistakes While Calculating Import IGST

Businesses often make mistakes during import valuation that can lead to incorrect duty payments or compliance issues.

Some common errors include:

• Calculating IGST only on the invoice value instead of the cumulative taxable value.
• Ignoring the applicable Basic Customs Duty (BCD) while determining the IGST base.
• Incorrectly assuming that Social Welfare Surcharge (SWS) can be claimed as ITC.
• Using an incorrect HSN code, resulting in an incorrect customs duty or IGST rate.
• Declaring an inaccurate assessable value due to errors in freight, insurance, or currency conversion.

Reviewing customs documentation carefully before filing the Bill of Entry can help avoid these issues.

Input Tax Credit (ITC) on IGST Paid at Customs: What You Can Claim

One of the advantages the GST framework brought to importers is ITC eligibility on IGST paid at customs. Registered businesses can offset this against their outward GST liability, reducing the tax paid out of pocket over the course of normal business operations.

Conditions to claim ITC on import IGST:

• The importer must be registered under GST
• Goods must be used in the course of business, not for personal consumption
• The Bill of Entry must reflect the IGST payment
• The IGST amount must be reflected in GSTR-2B before ITC is claimed

What cannot be claimed as ITC:

• Basic Customs Duty: this is not a GST levy and remains a cost
• Social Welfare Surcharge is similarly excluded from ITC
• IGST paid on goods used for exempt supplies or personal use

The ITC on IGST works as a full set-off against IGST, CGST, or SGST liabilities in that order of priority under the GST credit utilisation rules.

Import of Services: How GST Applies Under the Reverse Charge Mechanism

It is worth mentioning that the GST applicable to imported services is different because it includes both services and goods. In case a company operating in India gets services from abroad, IGST will apply, and the Reverse Charge Mechanism will be used in order to calculate the tax.

Common examples of imported services:

• Software subscriptions from foreign vendors
• Cloud hosting or SaaS platforms billed from abroad
• Consulting, legal, or advisory services from overseas firms
• Online training or certification platforms based outside India

Key points on RCM for imported services:

• The Indian recipient pays IGST under RCM regardless of GST registration status if the service is for business purposes
• No customs involvement, and the liability is self-reported and paid via GST return
• ITC can be claimed on RCM IGST if the service qualifies for credit

GST Exemptions on Imports: Goods That Are Not Taxed

Not all imports attract IGST at full rates. Several categories carry exemptions or concessional rates:

Category	GST Treatment
Life-saving drugs and medical equipment (notified list)	Exempt or 5%
Books, journals, newspapers	Exempt
Seeds for sowing	Exempt
Certain defence imports	Exempt under government notifications
Goods imported under advance authorisation	IGST deferred/exempt subject to export obligation
EOUs (Export-Oriented Units)	Conditional exemptions applicable

Rates and exemptions are product-specific and depend on the HSN code of the imported item. Importers should verify the applicable rate via the customs tariff schedule before assuming exemption.

What Changed After September 2025: GST Council Updates on Imports

The 2025 GST Council notice issued in September dealt with two issues that posed uncertainties for the importers:

1. Valuation of related-party imports: In cases where the goods are being imported from a related party, such as a parent or subsidiary, and if the invoice price is lower than the open market price, the value could be revised by customs. The 2025 notice harmonized customs valuation and GST taxable value determination methods to avoid double scrutiny.
2. ITC conditions for goods held in bonded warehouses: The updated FAQ clarified that IGST paid on goods cleared from bonded warehouses qualifies for ITC at the point of customs clearance, provided the Bill of Entry is filed under the same GSTIN claiming the credit. This resolved ambiguity for importers who warehouse goods before deciding the end-use destination.

How to Pay IGST on Imports: The Process at Customs

The following are the steps a registered importer follows to discharge IGST at the time of customs clearance:

1. File a Bill of Entry on the ICEGATE portal with accurate HSN codes and declared value
2. Calculate applicable duties BCD, SWS, and IGST, based on the assessable value
3. Pay duties online through ICEGATE, linked to the importer’s GSTIN
4. Collect the Bill of Entry as proof of IGST payment for ITC purposes
5. Reflect IGST in GSTR-2B auto-populated from customs data; verify before claiming ITC
6. Claim ITC in GSTR-3B to offset the IGST paid against outward tax liability

The customs and GST systems share data electronically, so IGST paid at customs feeds into the GST credit ledger without requiring manual entry.

Conclusion

GST on customs duty follows a layered calculation where IGST applies over the assessable value plus BCD and surcharge, not just the invoice price. For registered importers, the IGST paid at customs converts into Input Tax Credit, recovering a significant portion of the import tax cost against outward GST liability. Import of services works separately under reverse charge. 

The September 2025 updates brought clarity on valuation and bonded warehouse ITC eligibility, reducing compliance friction for businesses with complex import operations. Getting the calculation right and filing the Bill of Entry accurately are the two things that determine whether an import stays cost-efficient or creates avoidable tax exposure. 

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FAQs

1. What is the difference between Basic Customs Duty and IGST on imports?

Basic Customs Duty is levied under the Customs Act; IGST is a GST levy charged on the cumulative value of goods, including BCD at the customs stage.

2. Can a small business or unregistered importer claim ITC on IGST paid at customs? 

ITC on import IGST is available only to GST-registered businesses. Unregistered importers pay IGST but cannot offset it against any tax liability.

3. Is IGST applicable on all imported goods entering India regardless of their end use? 

IGST applies to all commercial imports. Specific exemptions exist for certain goods under government notifications based on HSN codes and import purpose.

4. How is IGST calculated when goods are imported under a concessional customs duty rate? 

The IGST taxable base uses the actual BCD paid after applying any exemption or concession, so a lower BCD rate results in a proportionally lower IGST taxable value.

5. Does GST apply to services purchased from foreign vendors by Indian businesses? 

Yes, imported services attract IGST under the Reverse Charge Mechanism, payable by the Indian recipient regardless of whether the foreign supplier is GST-registered.