Patent Illegality, Enforcement, and Unstamped Agreements: How the Supreme Court Reshaped Arbitration Law in India

This article is for educational and legal awareness purposes only. It does not constitute legal advice or solicitation. Please consult a qualified advocate for advice on specific legal matters.

Overview

The Arbitration and Conciliation Act, 1996 is built on a promise of minimal judicial interference — Section 5 of the Act states that “notwithstanding anything contained in any other law for the time being in force, in matters governed by this Part, no judicial authority shall intervene except where so provided in this Part.” How that promise is actually honoured, however, has been worked out almost entirely through Supreme Court decisions, and the working-out has not been a straight line. This article traces two of the doctrinal threads the Court has spent two decades untangling: how much scrutiny a court may exercise over an arbitral award under Section 34’s “patent illegality” ground, and what happens to an arbitration agreement when the underlying contract is unstamped or under-stamped — a question that produced two conflicting Supreme Court rulings within eighteen months before a seven-Judge Bench finally settled it.

The Statutory Scheme

Three provisions frame the discussion:

Section 34 allows a party to apply to set aside an arbitral award on limited grounds — procedural defects, incapacity, an invalid arbitration agreement, an award beyond the scope of submission, or the award being in conflict with the “public policy of India.”
Section 36 governs enforcement: once the time to challenge an award under Section 34 has expired (or a Section 34 application has been dismissed), the award is enforced as if it were a decree of a civil court.
Sections 8 and 11 govern, respectively, a judicial authority’s reference of parties to arbitration and a court’s power to appoint an arbitrator — both triggered at the very start of a dispute, before any award exists.

Judicial Review of Awards: The “Patent Illegality” Line

Saw Pipes Widens “Public Policy” (2003)

In Oil & Natural Gas Corporation Ltd. v. Saw Pipes Ltd., (2003) 5 SCC 705, the Supreme Court interpreted the then-existing “public policy of India” ground under Section 34(2)(b)(ii) to include, in addition to the settled understanding of public policy, a fresh category: an award could be set aside if it was “patently illegal” — for instance, if it contravened the substantive provisions of law, the terms of the contract, or was otherwise “so unfair and unreasonable that it shocks the conscience of the court.” The decision was widely criticised for opening the door to a merits review of arbitral awards under the guise of a public-policy challenge, effectively converting a supervisory Section 34 proceeding into something closer to an appeal.

Western Geco Widens It Further (2014)

Eleven years later, in Oil & Natural Gas Corporation Ltd. v. Western Geco International Ltd., (2014) 9 SCC 263, the Court expanded the “fundamental policy of Indian law” limb of the public-policy ground still further. It held that fundamental policy of Indian law includes the requirement that a decision-making authority act judicially — considering all relevant circumstances, according natural justice, and arriving at a decision that is not perverse — and imported a Wednesbury reasonableness standard borrowed from administrative law: an award could be set aside if no reasonable person, on the material before the tribunal, could have arrived at it. This widened judicial intervention considerably beyond what Saw Pipes had already allowed.

Parliament Intervenes: The 2015 Amendment

Responding to concerns that Section 34 was being used to re-litigate the merits of arbitral disputes, Parliament amended Section 34 with effect from 23 October 2015. The amended provision now reads, in Explanation 1 to Section 34(2)(b)(ii):

“For the avoidance of any doubt, it is clarified that an award is in conflict with the public policy of India, only if — (i) the making of the award was induced or affected by fraud or corruption or was in violation of section 75 or section 81; or (ii) it is in contravention with the fundamental policy of Indian law; or (iii) it is in conflict with the most basic notions of morality or justice.”

Explanation 2 clarifies that “the test as to whether there is a contravention with the fundamental policy of Indian law shall not entail a review on the merits of the dispute” — a direct legislative repudiation of the broader reading in Western Geco. The amendment also inserted a new sub-section, Section 34(2A), creating “patent illegality” as a distinct, narrower ground available only for purely domestic awards (arbitrations other than international commercial arbitrations):

“An arbitral award arising out of arbitrations other than international commercial arbitrations, may also be set aside by the Court, if the Court finds that the award is vitiated by patent illegality appearing on the face of the award: Provided that an award shall not be set aside merely on the ground of an erroneous application of the law or by reappreciation of evidence.”

Associate Builders Attempts Discipline (2014)

Shortly before the 2015 Amendment took effect, in Associate Builders v. Delhi Development Authority, (2015) 3 SCC 49 (decided 25 November 2014, so still applying the pre-amendment text), the Court attempted to bring structure to the existing public-policy ground. It held that “patent illegality” must go to the root of the matter — a contravention of a statute not linked to public policy or public interest is not, by itself, a ground to set aside an award — and that a court cannot substitute its own view of the evidence for the arbitrator’s. This decision anticipated much of what Parliament codified months later, though it was decided under the older statutory language.

Ssangyong Confirms the Narrower Post-2015 Standard (2019)

The leading authority applying the amended Section 34 is Ssangyong Engineering & Construction Co. Ltd. v. National Highways Authority of India, AIR 2019 SC 5041, decided 8 May 2019 by a bench of Justices R.F. Nariman and Vineet Saran. The Court held that Western Geco’s Wednesbury-reasonableness gloss on “fundamental policy of Indian law” does not survive the 2015 Amendment — Explanation 2 forecloses any merits review under that head. On patent illegality under Section 34(2A), the Court held that the ground is confined to illegality that goes to the root of the matter and appears on the face of the award; it cannot be invoked to re-characterise the tribunal’s construction of contract terms, reappreciate evidence, or interfere merely because a different view was possible. This remains the governing standard for the scope of Section 34 review today.

Enforcement and the Automatic-Stay Question: Section 36

Before the 2015 Amendment, merely filing a Section 34 application automatically stayed enforcement of an award — a practice widely blamed for years of delay. Section 36, as substituted with effect from 23 October 2015, removed this automatic stay: filing a Section 34 application no longer renders an award unenforceable unless the court, on a separate application, grants a stay for reasons recorded in writing.

The 2019 Amendment then inserted Section 87, which sought to make the 2015 Amendment’s reforms — including the removal of automatic stay — prospective only, applying solely to arbitral and court proceedings commenced on or after 23 October 2015, and reviving automatic stay for pending matters. In Hindustan Construction Company Ltd. v. Union of India, decided 27 November 2019 (AIR 2020 SC 122), a bench of Justices R.F. Nariman, Surya Kant, and V. Ramasubramanian struck down Section 87 as manifestly arbitrary and violative of Article 14 of the Constitution of India. The Court reasoned that reviving automatic stay for a large body of pending enforcement proceedings — after Parliament itself had recognised, through the 2015 Amendment, that automatic stay caused indefinite delay and prejudiced award-holders — was an unreasonable and arbitrary classification with no rational basis.

The Standard in Practice: An Allahabad High Court, Lucknow Bench Illustration

The narrow scope of post-award scrutiny is not merely academic — it decides real appeals. In M/S UCM Coal Co. Ltd., Lko. v. Adani Enterprises Ltd., decided by a Division Bench of the Lucknow Bench of the Allahabad High Court on 23 September 2025 (judgment authored by Justice Jaspreet Singh, sitting with Chief Justice Arun Bhansali), the Court heard an appeal under Section 37 of the Arbitration and Conciliation Act, 1996 arising from a Section 34 proceeding, against an arbitral award running into several crores of rupees. The Court dismissed the appeal, describing the jurisdiction under Section 34 as fairly narrow and that of the appellate court under Section 37 as all the more circumscribed — a court cannot reappreciate evidence or substitute its own interpretation of a contract for a plausible view taken by the arbitral tribunal, and an award is not liable to be set aside merely because an alternative interpretation of the contract was possible. The judgment applies, in a Lucknow Bench appeal, the same disciplined approach to patent illegality that Ssangyong laid down at the level of the Supreme Court.

Before the Award Even Exists: The Unstamped Arbitration Agreement Saga

A second, more recent line of Supreme Court decisions concerns a threshold question that arises even before arbitration begins: what happens when an arbitration clause is contained in a contract that has not been properly stamped under the Indian Stamp Act, 1899? For years, following SMS Tea Estates (P) Ltd. v. Chandmari Tea Co. (P) Ltd., (2011) 14 SCC 66, and Garware Wall Ropes Ltd. v. Coastal Marine Constructions & Engg. Ltd., (2019) 9 SCC 209, the position was that an arbitration agreement in an unstamped instrument could not be acted upon until the deficiency was cured. This was tested, reversed, and finally re-settled across three Supreme Court rulings in under three years.

N.N. Global Mercantile (P) Ltd. v. Indo Unique Flame Ltd., (2021) 4 SCC 379, decided 11 January 2021 by a three-Judge Bench (Justices Indira Banerjee, Indu Malhotra, and D.Y. Chandrachud), took a different view. Speaking through Justice Malhotra, the Court held that an arbitration agreement, being separable from and independent of the underlying commercial contract, survives even where the substantive contract is unstamped — non-payment of stamp duty is a curable defect that does not render the arbitration clause non-existent or unenforceable. Because this took a view at variance with Garware, the correctness of that position was referred to a larger Bench.

That reference produced N.N. Global Mercantile (P) Ltd. v. Indo Unique Flame Ltd., (2023) 7 SCC 1, decided 25 April 2023 by a five-Judge Constitution Bench. By a 3:2 majority, with Justice K.M. Joseph writing for the majority, the Court reversed course: it held that SMS Tea Estates and Garware “represent the correct position in law,” that an unstamped instrument which is exigible to stamp duty “cannot be said to be a contract… enforceable in law,” and is therefore not enforceable at the referral stage — expressly disapproving the 2021 three-Judge ruling as wrongly decided. Justices Ajay Rastogi and Hrishikesh Roy dissented, agreeing with the 2021 position.

The 2023 majority ruling proved short-lived and drew significant criticism for reintroducing a fresh layer of pre-arbitration litigation over stamp duty. A seven-Judge Constitution Bench was convened to reconsider the question, and in In Re: Interplay Between Arbitration Agreements under the Arbitration and Conciliation Act, 1996 & the Indian Stamp Act, 1899, (2024) 6 SCC 1 : 2023 INSC 1066, decided 13 December 2023, the Court — led by Chief Justice D.Y. Chandrachud, with Justices Sanjay Kishan Kaul, B.R. Gavai, Surya Kant, J.B. Pardiwala, and Manoj Misra, and a separate concurring opinion by Justice Sanjiv Khanna — unanimously held:

Agreements that are unstamped or inadequately stamped are inadmissible in evidence under Section 35 of the Indian Stamp Act, 1899. They are not rendered void, void ab initio, or unenforceable.
Non-stamping or inadequate stamping is a curable defect.
An objection as to stamping does not fall for determination under Sections 8 or 11 of the Arbitration and Conciliation Act, 1996 — the referral court’s role at that stage is confined to examining whether an arbitration agreement prima facie exists.
Objections relating to stamping fall within the domain of the arbitral tribunal, not the referral court.
The five-Judge decision in N.N. Global (2023) and the earlier ruling in SMS Tea Estates were overruled; paragraphs 22 and 29 of Garware Wall Ropes were overruled to that extent.

The Court also noted, in the course of tracing the referral-stage standard, that Section 11(6A) of the Act — which confines a court’s Section 11 examination to the existence of an arbitration agreement — remains in force, since Section 3 of the 2019 Amendment Act, which would have omitted it, had not yet been notified as of that judgment.

Takeaway

Two lessons emerge from these two doctrinal threads. First, the scope of judicial review under Section 34 has narrowed considerably since Saw Pipes and Western Geco: after the 2015 Amendment and Ssangyong, patent illegality is confined to illegality on the face of a purely domestic award that goes to the root of the matter, and cannot be used to reopen questions of evidence or contractual interpretation — a discipline the Lucknow Bench applied directly in the UCM Coal appeal. Second, a threshold procedural defect like an unstamped instrument no longer derails arbitration at the outset: since the seven-Judge Bench’s 2023 ruling, a referral court examines only the prima facie existence of the arbitration agreement, leaving stamping objections — like most other disputes between the parties — to the arbitral tribunal. Both developments point the same direction: an arbitration-friendly reading of the Act that keeps courts at the margins of the process, intervening only where the statute clearly requires it.

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