1. Understanding the Fundamental Concepts: Section 7 vs Section 8
Under India's Goods and Services Tax framework, tax is levied on the principle of destination-based consumption. This means the tax revenue ultimately accrues to the state where the goods or services are actually consumed, rather than the state where they were manufactured or sold.
To implement this smoothly without interstate border checkposts, the law bifurcates all transactions into two distinct categories governed by the Integrated Goods and Services Tax (IGST) Act 2017:
What is an Intrastate Supply? (Section 8)
An intrastate supply occurs when the Location of the Supplier and the Place of Supply (PoS) are within the exact same State or Union Territory. On these supplies, two separate taxes are charged simultaneously:
- Central GST (CGST): Accrues to the Union Government of India.
- State GST (SGST): Accrues to the specific State Government.
- Union Territory GST (UTGST): Replaces SGST in Union Territories without a legislative assembly (e.g. Chandigarh, Ladakh, Lakshadweep).
What is an Interstate Supply? (Section 7)
An interstate supply occurs when the Location of the Supplier and the Place of Supply (PoS) are in:
- Two different States (e.g. Maharashtra to Karnataka).
- A State and a Union Territory (e.g. Delhi to Chandigarh).
- Two different Union Territories (e.g. Ladakh to Daman & Diu).
- Any supply to/from a Special Economic Zone (SEZ unit or developer).
- Import or Export of goods/services into or out of India.
2. Comprehensive Comparison: Interstate vs Intrastate GST
The following side-by-side matrix highlights the operational, statutory, and return-filing differences between the two supply types:
| Parameter | Interstate Supply (IGST) | Intrastate Supply (CGST + SGST) |
|---|---|---|
| Governing Law | Section 7 of IGST Act 2017 | Section 8 of IGST Act 2017 & CGST Act 2017 |
| Tax Components | 100% IGST | 50% CGST + 50% SGST (or UTGST) |
| Revenue Destination | Central Government shares 50% with Destination State | Central Govt gets 50% (CGST), Origin State gets 50% (SGST) |
| SEZ Supplies | Always Interstate (Section 7(5)(b)) | Never Intrastate, even if within same city/state |
| Composition Scheme | Prohibited (Cannot make interstate outward supplies) | Allowed (1% / 5% flat turnover tax) |
| Mandatory GST Registration | Mandatory under Section 24 (even if turnover is under ₹20L/₹40L)* | Threshold exemption available (₹40L for goods, ₹20L for services) |
| E-Way Bill Threshold | Uniform ₹50,000 consignment value nationwide | Varies by State (₹1,00,000 in MH/DL, ₹50,000 in others) |
| GSTR-1 Reporting | Table 4 (B2B), Table 5 (B2C Large > ₹1L), Table 7 (B2C Small) | Table 4 (B2B) or Table 7 (B2C Net Intrastate) |
*Note: Central Notification No. 10/2019-Central Tax grants an exemption from mandatory interstate registration for service providers whose aggregate turnover does not exceed ₹20 Lakhs (₹10 Lakhs in Special Category States).
Watch: Expert Video Explanations on Interstate vs Intrastate GST
Visualise how Place of Supply and tax routing operate in real-life business scenarios through these curated masterclasses:
Interstate & Intrastate Supply: Section 7 & 8 Concepts
Clear walkthrough of statutory definitions under the IGST Act 2017, determining supplier location, and understanding tax distribution.
The Real Difference Explained: Real-World Business Cases
Comprehensive step-by-step case studies showing how traders, retailers, and service providers calculate tax on interstate vs local sales.
Place of Supply & Supplies in Territorial Waters
Detailed examination of complex scenarios including coastal supplies, offshore deliveries, Bill-To Ship-To models, and SEZ provisions.
3. The Golden Rule: Determining the "Place of Supply" (PoS)
Many business owners make the mistake of looking only at the buyer's registered address. However, the GST law states that the nature of tax depends on the comparison between two specific legal points:
The Statutory Rule: Compare the Location of the Supplier with the Place of Supply (PoS).
- If Location of Supplier == Place of Supply → Intra-State Supply (CGST + SGST)
- If Location of Supplier != Place of Supply → Inter-State Supply (IGST)
Place of Supply Rules for Goods (Section 10 of IGST Act)
The Place of Supply is the location where the goods are delivered to the recipient (where movement terminates).
If goods are delivered to a third party on the direction of the buyer, the PoS is deemed to be the buyer's principal place of business.
The Place of Supply is the location of the goods at the time of delivery to the recipient (e.g. over-the-counter retail).
The Place of Supply is the actual site where the goods or machinery are assembled or installed (e.g. factory machinery erection).
4. Input Tax Credit (ITC) Utilization Order (Rule 88A)
A major challenge faced by accountants is setting off input tax credits in GSTR-3B. Rule 88A of the CGST Rules, enacted through Section 49A and 49B, mandates a strict hierarchy for credit utilization to prevent revenue leakages:
The Mandatory 3-Step ITC Utilization Order:
- Step 1 (Exhaust IGST Credit Fully): Input tax credit on account of IGST must first be completely utilized towards payment of IGST liability. Any remaining IGST credit can be utilized towards payment of CGST and SGST/UTGST in any order and in any proportion chosen by the taxpayer.
- Step 2 (Utilize CGST Credit): Input tax credit of CGST can be utilized towards payment of CGST liability first, and any remaining balance towards IGST liability. CGST credit can NEVER be utilized against SGST/UTGST liability.
- Step 3 (Utilize SGST/UTGST Credit): Input tax credit of SGST/UTGST can be utilized towards payment of SGST/UTGST liability first, and any remaining balance towards IGST liability. SGST credit can NEVER be utilized against CGST liability.
5. How to Rectify Wrong Tax Payment (Section 77 CGST & Section 19 IGST)
What happens if you accidentally charge and pay CGST + SGST on an invoice that was actually an interstate supply (or vice-versa)?
1. No Interest on Correct Tax: If you paid the wrong tax bona fide, you must deposit the correct tax (e.g., pay the IGST). By statute, no interest is payable under Section 50 on the late payment of the correct tax.
2. Refund of Wrongly Paid Tax: You can claim a complete refund of the wrongly paid tax (CGST + SGST) by filing an application in Form GST RFD-01 under the category "Excess payment of tax". Under Circular 162, the 2-year time limitation for filing this refund begins only from the date of payment of the correct tax!
Frequently Asked Questions (FAQs)
What is the difference between Interstate and Intrastate GST in simple words?
Intrastate GST applies when sales happen inside your own state (e.g. Mumbai to Pune). You charge CGST (Central tax) and SGST (State tax) in equal halves. Interstate GST applies when sales cross state borders (e.g. Mumbai to Bengaluru) or go to SEZ units. You charge a single combined tax called IGST (Integrated GST).
Is it mandatory to register for GST if I do interstate sales?
Yes, under Section 24 of the CGST Act, any person making interstate taxable supplies of goods is mandatorily required to obtain GST registration, regardless of turnover (the standard ₹40 Lakh threshold does not apply). However, service providers making interstate supplies are exempt from mandatory registration if their aggregate annual turnover is below ₹20 Lakhs (₹10 Lakhs in special category states).
Can a Composition Dealer make interstate sales?
No. Section 10(2)(c) of the CGST Act clearly specifies that a taxpayer opted into the Composition Scheme is strictly prohibited from making any interstate outward supply of goods or services. If a composition dealer makes even a single interstate sale, their composition eligibility is revoked, and they must transition to the regular tax scheme.
How does an automated software like GST Munshi prevent wrong tax billing?
GST Munshi automatically inspects the 2-digit state code of your company GSTIN and compares it with the customer's GSTIN or selected Place of Supply (PoS). If the state codes match, the billing engine automatically applies CGST + SGST (or UTGST). If they differ, it automatically switches the invoice to IGST, recalculates tax lines, and generates the compliant GSTR-1 JSON without manual intervention.
