Sale Of Natural Gas Via Common Carrier Pipelines Is An Inter-State Sale; UP Has No Jurisdiction To Levy VAT: Supreme Court

"The movement of gas via common carrier does not change the nature of sale to disentitle the benefit of Section 3 of the CST Act... subsequent physical commingling with gas from other sources does not alter or relocate the character of the sale already concluded, " Supreme Court, in a significant judgment dated May 15, 2026, has affirmed that the sale of natural gas transported from one State to another through common carrier pipelines constitutes an "inter-State sale" under the Central Sales Tax Act, 1956.

A bench of Justice J.K. Maheshwari and Justice Atul S. Chandurkar held that the State of Uttar Pradesh lacked the jurisdiction to impose Value Added Tax (VAT) on such transactions, as the role of the seller concluded at the delivery point in Andhra Pradesh. The Court observed that the subsequent co-mingling of gas in pipelines is a mere incident of transportation that does not shift the situs of sale.

Reliance Industries Limited (RIL) extracts natural gas from the KG-D6 basin off the coast of Andhra Pradesh and delivers it to buyers at a designated point in Gadimoga, AP. The gas is then transported via common carrier pipelines through Gujarat to various purchasers in Uttar Pradesh. The State of Uttar Pradesh sought to levy VAT on these transactions, contending that since the gas becomes "co-mingled" and "unascertained" during transit, the sale is only completed upon delivery at the buyer's premises in UP. The Allahabad High Court quashed the assessment orders, prompting the State to appeal.

The primary question before the Court was whether the sale of natural gas, which occasions movement from Andhra Pradesh to Uttar Pradesh, is an inter-State sale under Section 3(a) of the CST Act or an intra-State sale taxable by UP. The Court was also called upon to determine whether the "fungible" nature of gas in a common carrier pipeline relocates the point of sale to the destination State. Additionally, the bench examined whether Explanation 3 to Section 3 of the CST Act, introduced in 2016, applies retrospectively to these transactions.

Constitutional Limitations On State Taxing Power

Court Explains Boundaries Of Fiscal Federalism

The Court began by emphasizing that the Constitution of India maintains a principle of mutual exclusivity in the distribution of taxing powers between the Union and the States. Referring to Article 246 and Article 286, the bench noted that no State law can impose a tax on the supply of goods where such supply takes place outside the State or in the course of inter-State trade. The bench remarked that the construction of taxing entries must avoid overlapping to prevent the mischief of double taxation.

Primacy Of Central Sales Tax Act Over State VAT Laws

The bench observed that once a transaction fulfills the conditions of an inter-State sale under Section 3 of the CST Act, it falls within the exclusive domain of the Union Government. To the extent that a transaction is covered by the CST Act, Section 7 of the UP VAT Act can have no independent operation. The Court held that State boundaries for tax jurisdiction are strictly drawn by the Constitution, and any attempt by a State to levy VAT on inter-State movement would encroach upon Parliament’s jurisdiction.

"The dimension given to the field of legislation by the language of an entry in List II... shall always remain subject to the limits of constitutional empowerment."

The Character Of Inter-State Sales

Three Essentials To Constitute An Inter-State Sale

Relying on the Constitution Bench decision in State of Andhra Pradesh v. NTPC, the Court reiterated that a sale in the course of inter-State trade requires a contract of sale incorporating a stipulation for movement of goods from one State to another, actual movement pursuant to such contract, and a direct nexus between the sale and the movement. The bench found that the Gas Sales and Purchase Agreement (GSPA) clearly occasioned the movement of gas from Andhra Pradesh to the buyers' facilities in Uttar Pradesh.

Situs Of Sale Is Materially Irrelevant Under Section 3

The Court categorically rejected the State’s argument that the sale was completed in UP because the gas was "unascertained" during transit. It held that for the purposes of Section 3(a) of the CST Act, it is immaterial in which State the property in goods passes. The decisive factor is whether the contract itself results in inter-State movement. The bench noted that the "taxable event" is the inter-State sale, and the State where the movement commences is the "appropriate State" under the CST Act.

"Once a transaction of sale fulfils a condition of an inter-State trade under Section 3 of the CST Act... application of Section 4 of the CST Act is completely misplaced."

Impact Of Pipeline Transportation And Co-mingling

Fungibility Does Not Relocate The Character Of Concluded Sale

Addressing the State's "impressive but flawed" argument on co-mingling, the Court held that the transportation of gas in a common pipeline on an "open access" basis does not affect the inter-State character of the original transaction. Borrowing from US Supreme Court jurisprudence in Peoples Natural Gas Co. v. Public Service Commission, the bench noted that the passing of title at the agreed delivery point constitutes the legally operative moment of the transaction. Subsequent physical mixing with gas from other sources is merely an incident of transportation.

Appropriation Occurs Upon Delivery To The Carrier

The Court further clarified that under Section 23(2) of the Sales of Goods Act, 1930, once goods are delivered to a carrier for transmission to the buyer, they are treated as "appropriated" to the contract. In the present case, RIL’s role concluded the moment gas was handed over to the transporter at Gadimoga. Any processing or change in the nature of the gas during its journey through the GAIL network was held to be immaterial to the determination of the inter-State nature of the transaction.

Explanation 3 To Section 3 Is Clarificatory And Retrospective

2016 Amendment Does Not Create A New Legal Position

The bench repelled the State’s contention that the 2016 amendment to the CST Act, which added Explanation 3 regarding gas in common carriers, was only prospective. The Court held that the amendment was inserted "ex abundanti cautela" (out of abundant caution) to formalize existing situations. Since the provision was curative and intended to clear ambiguities regarding fungible goods in pipelines, it must be read as effective from the date the main provision came into force.

"If a statute is curative or merely clarificatory of the previous law, retrospective operation thereof may be permitted."

State Cannot "Approbate And Reprobate"

Issuance Of Form-C Constitutes Recognition Of Inter-State Sale

The Court took serious note of the fact that the State of Uttar Pradesh had already issued "Form-C" to the buyers for these very transactions. Under the CST Rules, Form-C is a declaration specifically meant for inter-State trade. The bench held that having recognized the transactions as inter-State sales by providing Form-C, it was not open for the State to "approbate and reprobate" by characterizing the same transactions as intra-State sales for the purpose of levying VAT.

The Supreme Court concluded that the High Court’s order was perfectly in line with the constitutional scheme and statutory mandate. Finding no valid reason to interfere, the bench dismissed the appeals filed by the State of Uttar Pradesh. The ruling solidifies the legal position that the physical characteristics of goods in transit, such as co-mingling in pipelines, cannot override the contractual and statutory character of an inter-State sale.

Date of Decision: 15 May 2026