CGST vs SGST vs IGST: Differences, Meaning & Examples

What Are CGST, SGST and IGST?

CGST, SGST and IGST together make up the GST structure applied to most transactions in India. What is CGST comes down to the Central Goods and Services Tax, collected by the Central Government. What is SGST refers to the State Goods and Services Tax, collected by the respective State Government.

What is IGST is the Integrated Goods and Services Tax, collected by the Central Government on supplies that move between States. CGST SGST IGST apply based on the nature of the supply rather than the type of product or service being sold.

CGST vs SGST vs IGST: Key Differences

The table below outlines the difference between IGST CGST and SGST at a glance.

This CGST SGST IGST difference makes clear that CGST and SGST are generally charged together on intra-State supplies, while IGST applies on its own to inter-State supplies.

When Is CGST and SGST Charged?

CGST and SGST apply to an intra-State supply, meaning the supplier and the place of supply are in the same State.

Example:

• Supplier: Maharashtra
• Customer: Maharashtra
• Result: CGST + SGST

The supplier's location and the applicable place of supply together determine the CGST SGST on intra state supply treatment, rather than the customer's billing address alone.

When Is IGST Charged?

IGST on inter state supply applies when the supplier and the place of supply fall in different States.

Example:

• Supplier: Maharashtra
• Customer: Gujarat
• Result: IGST

Other transactions, such as certain imports and specific cross-border supplies, are also treated as inter-State under GST rules. IGST vs CGST SGST essentially separates transactions by whether they stay within one State or cross a State boundary.

CGST and SGST vs IGST With Simple Examples

Practical CGST SGST IGST examples help clarify how the tax appears on an actual invoice.

Example 1: Intra-State Sale — A business in Maharashtra sells goods worth a taxable value to a customer also in Maharashtra. The invoice shows CGST and SGST charged separately, each covering half of the applicable GST rate.

Example 2: Inter-State Sale — A business in Maharashtra sells the same goods to a customer in Gujarat. The invoice shows a single IGST component covering the full applicable GST rate, with no CGST or SGST charged.

How to Calculate CGST, SGST and IGST

CGST SGST IGST calculation follows a straightforward structure once the nature of supply is known.

• Intra-State transaction: Taxable value → CGST component + SGST component (each typically half the applicable GST rate)
• Inter-State transaction: Taxable value → IGST (the full applicable GST rate)

This structure helps a business understand how CGST calculation, SGST calculation and IGST calculation appear on an invoice, without needing to reference every GST rate category.

How CGST, SGST and IGST Appear on a GST Invoice

A properly generated GST invoice should clearly display the taxable value, the GST rate applied, and the relevant tax components.

• Taxable value
• GST rate
• CGST amount (intra-State only)
• SGST amount (intra-State only)
• IGST amount (inter-State only)
• Total invoice value

An intra-State GST invoice lists CGST and SGST as separate line items, while an inter-State invoice lists a single IGST line. Billoxy's GST billing calculates and displays the correct CGST SGST invoice or IGST invoice components automatically, based on the supplier and customer details entered.

What Happens If the Wrong GST Is Charged?

Correctly determining the nature of supply before generating an invoice matters, since an IGST instead of CGST SGST error, or the reverse, can lead to a GST invoice error that needs correction.

For example, a transaction between a Maharashtra supplier and a Gujarat customer, incorrectly billed with CGST SGST instead of IGST, would need to be reversed and re-issued correctly. Businesses should follow applicable GST rules closely, and CBIC has specifically addressed situations where CGST, SGST and IGST have been charged incorrectly, offering guidance on how such errors should be resolved.

CGST vs SGST vs IGST: Which One Should You Charge?

A simple decision guide helps determine when to charge CGST and SGST versus when to charge IGST.

• Same State? → Generally CGST + SGST
• Different States? → Generally IGST

Businesses should still consider applicable place-of-supply rules and specific exceptions when deciding CGST or SGST or IGST, rather than relying only on the customer's billing address.

Simplify GST Billing With Billoxy

A dependable GST billing system helps businesses create GST invoices, apply the appropriate GST components, and generate invoices faster. It also helps maintain invoice records, reduce manual calculation and keep sales transactions organised.

Billoxy works as GST billing software that automatically determines whether a transaction needs CGST and SGST or IGST, based on supplier and customer location. As GST invoice software, it keeps billing information accessible whenever it is required, and functions as billing software with GST built into everyday sales and business operations.