Understanding the differences between CGST, SGST and IGST is essential for accurate tax compliance and return filing. In 2017, India implemented the Goods and Services Tax (GST) to simplify and unify indirect taxation across the country under the principle of “One Nation, One Tax.” GST is structured into three main components—IGST, CGST and SGST—which together streamline interstate and intrastate transactions while preserving the fiscal roles of both the Central and State governments.
This article explains what IGST, CGST and SGST are, how they apply, and how they differ, so businesses and taxpayers can make informed decisions and file returns correctly.
What is IGST?
Integrated Goods and Services Tax (IGST) applies to supplies of goods and services that cross state boundaries, as well as to imports into and exports out of India. IGST is collected by the Central Government and then apportioned between the centre and the concerned states according to the provisions of the GST law. Its purpose is to ensure seamless movement of goods and services across states without multiple taxation.
For example, if a trader in Telangana sells goods worth ₹200,000 to a buyer in West Bengal and the applicable IGST rate is 18%, the buyer will pay ₹36,000 as IGST along with the invoice value. The Central Government collects this tax and later distributes the appropriate share to the destination state.
What are CGST and SGST?
CGST stands for Central Goods and Services Tax and SGST stands for State Goods and Services Tax. Both apply to intrastate supplies—transactions where the seller and the buyer are within the same state.
Under GST, the tax that previously existed at the state level—such as value-added tax, entertainment tax, luxury tax and entry tax—was subsumed into SGST, while taxes collected by the central government on intrastate transactions are classified as CGST. For any intrastate sale, the tax is split equally between CGST and SGST. The Central and State Governments levy and collect their respective shares, maintaining a cooperative revenue-sharing mechanism.
For example, if a merchant in Gujarat sells a product within Gujarat and the applicable GST rate is 18%, CGST and SGST will each be charged at 9%—the combined effect being 18% total GST. The GST framework caps individual CGST or SGST rates so that their combined rate on a supply does not exceed the overall statutory limits.
Key differences between IGST, CGST and SGST
Understanding how IGST, CGST and SGST differ helps businesses correctly determine which tax applies and how input tax credits can be claimed and adjusted. Below is a concise comparison of the main points that distinguish these three components of GST.
| Basis | IGST | CGST | SGST |
|---|---|---|---|
| Applicability | Interstate supply of goods and services; imports and exports | Intrastate supply of goods and services | Intrastate supply of goods and services |
| Collecting Authority | Central Government | Central Government | State Governments |
| Revenue Distribution | Distributed between Centre and State | Receipts to the Central Government | Receipts to the State Government |
| Input Tax Credit Adjustment | ITC can be utilized against IGST, CGST or SGST liabilities following prescribed rules | ITC may be used against CGST or IGST as allowed by GST rules | ITC may be used against SGST or IGST as allowed by GST rules |
These distinctions determine how businesses account for tax on sales and purchases, how taxes are reported, and how credits are settled across different tax heads.
Practical notes for businesses
GST registration is generally required for businesses whose turnover exceeds the threshold specified under the GST law. As of the law’s framework, threshold limits determine registration and tax liability. Businesses should monitor their turnover, maintain accurate invoices, and apply the correct tax head—IGST for interstate transactions and CGST+SGST for intrastate transactions—to meet compliance requirements and avoid penalties.
Input Tax Credit (ITC) plays an important role in reducing the cascading effect of taxes. Businesses must follow the prescribed sequence when adjusting liabilities: IGST liabilities are typically set off first using available IGST credits; thereafter, remaining liabilities can be adjusted against CGST or SGST credits as permitted by the rules.
Frequently asked questions about CGST, SGST and IGST
Why is GST divided into CGST, SGST and IGST?
India’s federal structure assigns taxation powers to both the Central and State governments. Splitting GST into CGST, SGST and IGST preserves the revenue rights of both levels of government while creating a unified indirect tax system. This structure supports the One Nation, One Tax objective while allowing appropriate revenue sharing between centre and states.
Who collects IGST?
The Central Government collects IGST on interstate transactions and on imports; it then distributes the appropriate shares to the destination states as per GST provisions.
How are IGST, CGST and SGST adjusted?
Adjustment of tax liabilities follows the GST rules. Typically, IGST credit is used first against IGST liability. If there is any remaining liability, credit may be set off against CGST or SGST in the order permitted by law. The permitted sequence and set-off rules ensure there is no duplication and that credits are utilized appropriately across tax heads.
How do GST slabs relate to CGST, SGST and IGST?
GST rates are prescribed in different slabs—commonly nil (0%), 5%, 12%, 18% and 28%—and CGST, SGST and IGST are derived from those slabs. For intrastate transactions, the applicable slab is typically split equally between CGST and SGST. For example, if a supply carries a 12% GST rate, CGST and SGST would each be 6%, while IGST on an interstate supply would be 12%.
Clear understanding of IGST, CGST and SGST helps businesses calculate taxes correctly, claim eligible input tax credits, and comply with GST return filing requirements. Proper accounting practices and timely filings reduce compliance risks and ensure smoother interstate and intrastate trade.