CGST, SGST and IGST: The Difference, Which One You Need to Apply, and What Changes If You Operate in Multiple States or Do Export-Import

By the FinanceChecks.com Editorial Team | Published October 1, 2026 | Last reviewed October 1, 2026 | 9-minute read

If you’ve ever looked at a GST invoice and wondered why one bill shows “CGST + SGST” while another shows just “IGST,” you’re not alone. This confusion trips up new business owners constantly, and getting it wrong isn’t just a paperwork issue, charging the wrong tax head can mean your customer can’t claim input tax credit properly, or that you end up owing a correction later. The good news is that once you understand the one question GST law actually asks before every transaction, this stops being confusing at all.

This guide breaks down what CGST, SGST and IGST actually are, exactly which one applies and when, and what changes specifically if your business operates across multiple Indian states or deals with exports and imports.

Quick Answer

GST in India is split into three components: CGST (Central GST) and SGST (State GST), which apply together when the supplier and the place of supply are in the same state, and IGST (Integrated GST), which applies as a single combined tax when the supplier and the place of supply are in different states, or when the transaction involves an export, import, or supply to a Special Economic Zone (SEZ). The simple rule: if goods or services move within one state, you charge CGST plus SGST, split equally. If they move across a state border, or in or out of the country, you charge IGST alone, at the full rate. If your business operates in multiple states, you need a separate GST registration, and a separate GSTIN, for each state where you have a place of business, even though all registrations stay linked to the same PAN. Exports are treated as inter-state supplies and are zero-rated, meaning no GST is actually charged, while imports attract IGST in addition to customs duty.

About This Guide

This guide was compiled by the FinanceChecks.com editorial team using the CGST Act, 2017, the IGST Act, 2017, the SGST Acts of individual states, and Rule 11 of the CGST Rules governing multiple registrations, along with published guidance on place-of-supply determination for goods and services. GST compliance details, including registration thresholds and specific procedural rules, can be updated through periodic notifications, so we recommend confirming current requirements on the GST portal or with a tax professional before filing.

What CGST, SGST and IGST Actually Are

GST in India runs on what’s called a dual-tax structure, meaning both the central government and state governments have a share in every transaction, just organised differently depending on where that transaction happens.

• CGST (Central Goods and Services Tax) is the central government’s share of the tax, collected by the Centre on intra-state supplies, meaning both the supplier and the place of supply have to be within the same state or Union Territory.
• SGST (State Goods and Services Tax) is the corresponding state government’s share, collected by the state in which the supply takes place, and it is always charged alongside CGST, never on its own.
• IGST (Integrated Goods and Services Tax) is a single, combined tax that applies when a supply crosses state lines, or involves an export, import, or SEZ transaction. Rather than splitting into two separate components, IGST is charged as one tax at the full GST rate, and the revenue is later shared between the Centre and the destination state through a settlement mechanism.
• There’s a fourth, less commonly discussed component worth knowing: UTGST (Union Territory GST), which replaces SGST specifically in Union Territories that don’t have their own state legislature, functioning the same way SGST does elsewhere.

The One Rule That Decides Which Tax You Charge

Despite the different acronyms, there’s really only one question GST asks before every single transaction: are the supplier’s location and the place of supply in the same state, or different states?

If they’re in the same state, you charge CGST and SGST, split equally. If the applicable GST rate on a product or service is 18%, you charge 9% as CGST and 9% as SGST, and the total tax collected still comes to 18%, just divided between two tax heads instead of one.

If they’re in different states, or the transaction involves export, import, or an SEZ, you charge IGST alone, at the full rate. On that same 18% product sold inter-state, you charge 18% IGST as a single line item, never split, and never combined with CGST or SGST on the same invoice.

A Simple Worked Comparison

Scenario	Tax Charged	Example (18% GST rate, ₹1,00,000 invoice)
Supplier and buyer both in Karnataka	CGST + SGST	CGST ₹9,000 + SGST ₹9,000 = ₹18,000 total
Supplier in Karnataka, buyer in Tamil Nadu	IGST	IGST ₹18,000 (single line item)
Export of goods or services out of India	IGST, but zero-rated	₹0 charged; input tax credit still claimable
Import of goods into India	IGST + Customs Duty	IGST charged on assessed value, plus applicable customs duty
Supply to an SEZ unit within India	IGST, usually zero-rated under a Letter of Undertaking (LUT)	Typically ₹0 charged, with ITC refund available

The “Bill-To, Ship-To” Trap

Here’s a detail that catches even experienced business owners off guard: the place of supply isn’t always simply where the goods physically end up. For many transactions, GST law looks at the buyer’s registered, or billing, address to determine the place of supply, not necessarily the delivery address.

This means if a company registered in Tamil Nadu places an order that gets shipped directly to its warehouse in Gujarat, the transaction can still be treated as inter-state based on the Tamil Nadu billing address, requiring IGST, even though the goods never left India and the physical movement looks like it could be domestic within a single delivery chain. Getting this wrong, charging CGST and SGST based on the delivery state instead of IGST based on the billing state, is one of the more common invoicing errors businesses run into, and it matters because it affects which GSTIN the transaction is reported against and how the buyer claims input tax credit.

If Your Business Operates in Multiple States

This is where the structure of GST registration itself becomes important, and it surprises a lot of first-time multi-state businesses.

GST registration is not a single, nationwide license. Under Section 25 of the CGST Act, a business is required to obtain a separate GST registration in every state or Union Territory where it has a place of business, even if all those registrations belong to the same company and the same PAN. Each state registration gets its own distinct 15-digit GSTIN, and critically, each of these GSTINs is treated as a “distinct person” under GST law, even though they all trace back to the same legal entity.

What this means in practice: if your business has an office in Maharashtra and a warehouse in Haryana, you need two separate GST registrations, one for each state. Each registration files its own GST returns, maintains its own invoice numbering, and holds its own input tax credit ledger, the credit sitting in one state’s GSTIN generally cannot be used to offset a liability under a different state’s GSTIN. Even a transfer of goods between your own branches in two different states counts as a taxable supply between “distinct persons,” and generally attracts IGST.

Within a single state, the rule is more flexible. If you have multiple branches, warehouses, or offices in the same state, you can typically add them all as additional places of business under a single GSTIN, rather than registering separately for each one, though separate registration within the same state is also allowed under Rule 11 of the CGST Rules if you want to track different business verticals independently.

Multi-State Business: What Changes

Situation	What You Need	What It Means Operationally
Multiple branches, all in one state	Usually one GSTIN, each branch added as an “additional place of business”	Shared ITC ledger and return filing across branches
Branches in different states	A separate GSTIN for each state	Separate returns, separate ITC ledgers, and separate invoice series per state
Stock transfer between your own branches in different states	Treated as a taxable inter-state supply	IGST generally applies, even though it’s the same company
Different business verticals in the same state	Optional separate registration under Rule 11	Lets you track each vertical’s compliance independently

If Your Business Does Export or Import

Exports are treated as inter-state supplies, which means IGST is technically the applicable tax category, but exports are specifically zero-rated under GST law. In practice, this means you don’t actually collect GST from your overseas customer, the rate charged is effectively nil, but you can still claim a refund of the input tax credit you’ve accumulated on inputs used to produce the exported goods or services. Many exporters operate under a Letter of Undertaking (LUT), which allows them to export without paying IGST upfront at all and then claim the refund, rather than paying IGST first and claiming it back afterward, which is also technically permitted but ties up working capital unnecessarily.

Imports work in the opposite direction. When goods or services come into India from abroad, IGST is levied on the assessed value of the import, in addition to applicable customs duty, and this IGST is collected by the central government, generally at the point of customs clearance for goods. The IGST paid on imports is available as input tax credit for a registered business, the same way IGST on any other inter-state purchase would be.

Supplies to SEZ units inside India follow similar logic to exports. They’re treated as inter-state supplies for GST purposes and are typically zero-rated under an LUT as well, reflecting the idea that an SEZ is treated somewhat like a zone outside the regular domestic tax territory for this purpose.

Common Mistakes Businesses Make

A frequent mistake is charging CGST and SGST based on where goods are physically delivered rather than the buyer’s registered billing address, which can misclassify a genuinely inter-state transaction as intra-state, or the reverse. Another common mistake is assuming one GST registration automatically covers a business across every state it operates in, only to discover during an audit or while trying to claim input tax credit on a warehouse in a different state that a separate registration was actually required there all along. Businesses with multiple branches in different states also sometimes forget that transfers of their own stock between those branches are taxable supplies requiring IGST, since it doesn’t intuitively feel like a “sale” when it’s the same company moving its own goods. Exporters occasionally miss out on the cash flow benefit of filing a Letter of Undertaking, paying IGST upfront on exports and then going through a refund process unnecessarily, when the LUT route would have avoided that cash outlay altogether. Finally, many new business owners mix up CGST and SGST with IGST on the same invoice, listing a split tax alongside IGST, which is never correct, only one or the other applies to any single transaction, never both.

My Take

Once the “same state or different state” question clicks, CGST, SGST and IGST stop being three confusing acronyms and become one simple decision tree with different labels attached depending on the outcome. The actual complexity in GST compliance tends to live elsewhere, in correctly identifying the place of supply when billing and shipping addresses differ, and in managing the operational overhead of multiple GSTINs once a business genuinely operates across state lines.

If you’re running a business that’s expanding into a second state, or starting to take on export orders, the practical first step isn’t memorising more GST theory, it’s getting your registration structure right from day one. A wrongly structured registration, or a missed LUT filing for an exporter, tends to cost far more in corrected returns and lost working capital than the time it takes to set it up correctly at the start.

Frequently Asked Questions

1. What is the basic difference between CGST, SGST and IGST? CGST and SGST apply together, split equally, when a supply happens within a single state. IGST applies as one combined tax when a supply crosses state lines, or involves an export, import, or SEZ transaction.

2. How do I know whether to charge CGST+SGST or IGST? Check whether the supplier’s location and the place of supply are in the same state or different states. Same state means CGST+SGST; different states (or export, import, SEZ) means IGST.

3. Can CGST, SGST and IGST all appear on the same invoice? No. A single transaction is either intra-state (CGST+SGST) or inter-state (IGST alone), never both combinations together.

4. Do I need a separate GST registration for each state my business operates in? Yes. A separate GST registration, and a separate GSTIN, is required for every state or Union Territory where your business has a place of business, even under the same PAN.

5. Does stock transferred between my own branches in different states attract GST? Generally yes. Branches in different states are treated as “distinct persons” under GST law, so inter-branch stock transfers typically attract IGST.

6. Is GST charged on exports from India? Exports are treated as inter-state supplies but are zero-rated, meaning no GST is actually charged to the overseas buyer, though input tax credit on related inputs can still be claimed as a refund.

7. What is a Letter of Undertaking (LUT), and why do exporters use it? An LUT allows exporters to ship goods or services without paying IGST upfront and claiming a refund later, avoiding the cash flow impact of paying tax first and waiting for reimbursement.

8. Is GST charged on imports into India? Yes. IGST is levied on the assessed value of imported goods or services, in addition to applicable customs duty, and this IGST is generally available as input tax credit for a registered business.

9. What happens if I use the delivery address instead of the billing address to determine GST type? This can lead to misclassifying a transaction, charging CGST+SGST when IGST was actually required, or vice versa, since the place of supply is often based on the buyer’s registered billing address, not just where goods are shipped.

10. What is UTGST, and how is it different from SGST? UTGST applies in place of SGST specifically in Union Territories without their own state legislature, functioning the same way SGST does in regular states.

Disclaimer

This article is for general informational purposes only and does not constitute tax or legal advice. GST rates, registration thresholds, and compliance procedures are governed by the CGST Act, 2017, the IGST Act, 2017, and related state legislation, and can be updated through periodic government notifications. Readers should verify current requirements on the official GST portal (gst.gov.in) and consult a qualified tax professional or chartered accountant for guidance specific to their business. FinanceChecks.com is not a tax advisory service.

Last reviewed and fact-checked on October 1, 2026 by the FinanceChecks.com Editorial Team.