CGST is the central component
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GST invoice guide
CGST vs SGST vs IGST: A Clear Invoice Guide
The GST components shown on an invoice depend mainly on whether a taxable supply is treated as intra-state or inter-state. That conclusion normally compares the supplier's location with the legally determined place of supply—not simply the customer's name, payment location, or where the invoice was created.
This guide is general educational information, not legal, tax, or accounting advice. GST rules, notifications, thresholds, and invoice requirements can change. Confirm the treatment of a specific transaction with the latest official GST guidance or a qualified professional.
CGST and SGST on intra-state supplies
When the supplier location and place of supply are in the same state, a taxable supply is generally treated as intra-state. The tax is commonly divided between Central GST (CGST) and State GST (SGST). In a Union Territory without a legislature, UTGST may apply instead of SGST.
The combined rate is split into the applicable central and state or Union Territory components. For example, a supply subject to an 18% combined rate would commonly show 9% CGST and 9% SGST, assuming the ordinary intra-state treatment applies.
SGST is the state component
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UTGST may replace SGST in applicable Union Territories
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IGST on inter-state supplies
When the supplier location and place of supply are in different states or applicable territories, a taxable supply is generally inter-state and Integrated GST (IGST) is commonly charged. Imports, exports, and supplies to or by SEZ units can have specific inter-state treatment under the GST framework.
IGST is presented as one tax component rather than as separate CGST and SGST amounts. A zero-rated supply may still involve special documentation, bond or LUT procedures, or refund considerations, so “zero-rated” should not be treated as identical to every exempt supply.
Place of supply is the key check
For many goods transactions, movement, delivery, installation, or bill-to/ship-to facts influence place of supply. For services, the default rules and numerous service-specific rules can point to the recipient location, performance location, property location, event location, or another prescribed place.
A customer's GSTIN and address are important evidence, but they do not override a special place-of-supply rule. Review non-routine transactions before choosing the tax component.
Identify the supplier location
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Determine place of supply under the relevant rule
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Compare the two locations
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Check special treatment for SEZ, export, import, or other cases
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How to show GST components on an invoice
For an ordinary intra-state supply, show the taxable value, CGST rate and amount, and SGST or UTGST rate and amount separately. For an ordinary inter-state supply, show the taxable value and IGST rate and amount.
If an invoice has items subject to different rates, preserve a clear link between each taxable value and its tax calculation. The invoice total alone is not enough to explain how GST was computed.
Common mistakes to avoid
Common errors include treating the billing address as the place of supply without checking the governing rule, charging all three components together, using an outdated customer GSTIN, and overlooking special rules for services or bill-to/ship-to transactions.
Correcting the tax component after reporting may require an appropriate credit note, debit note, amended invoice, or return adjustment. The correct method depends on timing and facts, so material errors should be reviewed promptly.
Do not normally charge IGST together with CGST and SGST on the same taxable value
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Validate state codes and GSTIN details
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Document place-of-supply reasoning for unusual transactions
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Review corrections with an accountant or tax adviser
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Frequently asked questions
Questions about cgst vs sgst vs igst: a clear invoice guide
What is the difference between CGST, SGST, and IGST?
CGST and SGST or UTGST are generally charged together on an intra-state taxable supply. IGST is generally charged on an inter-state taxable supply.
Can CGST, SGST, and IGST all apply to one line item?
Ordinarily, the same taxable value is charged either CGST plus SGST or UTGST, or IGST—not all three. Special adjustments should be reviewed separately.
Is the customer's billing state always the place of supply?
No. Billing details may be relevant, but the applicable place-of-supply rule can depend on delivery, movement, property, performance, recipient location, or another transaction-specific factor.
What happens when the supplier and customer are in different states?
The supply may be inter-state and subject to IGST, but the conclusion still requires determining the supplier location and legal place of supply under the relevant rule.
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