Trying to Set Aside an Award for 'Patent Illegality'? Why Courts Usually Say No

By S&S Co. Advocates & Solicitors · Published 17 October 2026 · Informational content, not legal advice: see our disclaimer

A party that has just lost an arbitration almost always believes the tribunal got the facts wrong, and Section 34 of the Arbitration and Conciliation Act, 1996 looks like the way back into court. The ground most often reached for in a domestic award challenge is patent illegality, a concept the 2015 amendment wrote into the statute as Section 34(2A). It sounds like exactly what a disappointed party needs: a chance for a court to look past the arbitrator's findings and fix what went wrong. In practice the Supreme Court has drawn this ground so tightly that the overwhelming majority of patent illegality petitions fail long before anyone gets to argue the underlying facts again.

That gap between what the ground sounds like it offers and what it actually delivers is where most Section 34 petitions on this basis go wrong. A client convinced that the arbitrator misread a clause, or ignored a document that would have changed the outcome, needs to know early whether that grievance fits inside the narrow band Indian courts have carved out, or whether it is simply a request to reweigh evidence dressed up in different language.

What Section 34(2A) Actually Lets a Court Do

Before the 2015 amendment, courts had stretched the older public policy ground in Section 34(2)(b)(ii) to cover almost any serious error in an award. Parliament responded by splitting the grounds apart. For purely domestic awards, meaning awards that do not arise out of an international commercial arbitration, Section 34(2A) now permits a separate challenge where the award is vitiated by patent illegality appearing on the face of the award.

The provision comes with its own brake built in. Its proviso says in terms that an award shall not be set aside merely on the ground of an erroneous application of the law, or by reappreciation of evidence. That single sentence does most of the work in Indian arbitration litigation today. It tells a court, in advance, that disagreeing with the arbitrator's reading of a contract clause, or thinking the evidence pointed the other way, is not by itself a reason to interfere.

There is also a jurisdictional boundary that gets missed surprisingly often. Patent illegality is not available at all against an award arising from an international commercial arbitration, meaning one where at least one party is a foreign national, a foreign company, or a foreign government. Such awards are confined to the older public policy and natural justice grounds. Filing a patent illegality petition against the wrong category of award is a drafting mistake that gets flagged at the admission stage.

The Narrow Band Between an Illegal Award and a Wrong One

The Supreme Court's 2019 decision in Ssangyong Engineering set the governing test: an award will only be treated as patently illegal if the arbitrator's view is one that no fair-minded or reasonable person could have taken on the material before the tribunal. That is a considerably higher bar than the Court would have decided it differently.

Later decisions have sharpened the point rather than softened it. A 2022 ruling involving the Haryana Urban Development Authority held that an award can be set aside for patent illegality only where the illegality goes to the root of the matter, and that an erroneous application of law or a misappreciation of evidence by the arbitrator does not qualify. A 2023 decision involving Reliance Infrastructure and the State of Goa added a practical filter that is worth keeping close at hand while drafting: the illegality has to be visible on the face of the award itself, not something a court has to assemble by working back through pleadings and evidence over several days of argument. Calling an argument patent illegality instead of error does not change what the argument actually is.

Where Courts Have Actually Stepped In

None of this means the ground is dead. Courts have set aside awards where the arbitrator's findings had nothing to stand on at all, or where the award effectively rewrote the contract the parties had signed. Earlier Supreme Court guidance put it plainly: an award based on no evidence, or one that ignores vital evidence, is perverse, and a tribunal that rewrites a contract's terms breaches a basic principle of adjudication, since an arbitrator derives authority from the contract and cannot improve on it.

What separates these successful challenges from the many that fail is specificity. A party that can point to a finding with nothing in the record supporting it, or to an award clause that contradicts the plain words of the contract without any interpretive basis, is arguing patent illegality in the sense the Supreme Court actually means it. A party that is really arguing it had better evidence and the tribunal should have preferred that evidence is arguing something else, however the petition happens to be captioned.

A Recent High Court Illustration

In September 2024, the Calcutta High Court applied this framework in a way worth knowing before drafting a Section 34 petition. The Court held that it cannot re-appreciate evidence under the guise of examining patent illegality, and cannot adopt a different interpretation of the contract from the one the tribunal reached, absent an illegality that is actually patent. The Court was direct about its own role: it is not sitting in appeal over the tribunal's decision, and re-interpreting a contract simply because a judge might have read it differently is not a function Section 34 gives a court.

This is a High Court decision, not a fresh Supreme Court pronouncement, so it does not change the governing test. What it confirms is that trial courts continue to apply the Ssangyong and Reliance Infrastructure line strictly, rather than finding workarounds for sympathetic facts. A petitioner drafting today should assume the same scrutiny at the first hearing, not a more sympathetic one.

Drafting a Petition That Actually Fits the Ground

A patent illegality petition with a real chance starts from the award's own text, not from the client's version of events. It should identify the specific finding, the exact paragraph of the award, where the illegality appears on the face of the document, and should be able to state the defect without reference to a competing reading of the oral or documentary evidence. If making the argument requires walking the court through depositions, exhibits and a cross-examination transcript to show why the tribunal should have concluded otherwise, that is usually a sign the petition is actually asking for reappreciation, which the proviso to Section 34(2A) rules out.

It also helps to separate a patent illegality argument cleanly from a public policy or natural justice argument, since conflating all three tends to weaken each of them. A court reading a petition that throws every available ground at the award together often treats that as a sign that none of the grounds is particularly strong standing alone.

A Section 37 Appeal Does Not Reopen the Case Either

Where the Section 34 court does interfere, or refuses to, Section 37 allows an appeal, but that appeal is narrower still. The appellate court's job is to examine whether the Section 34 court correctly applied the principles governing interference with an award, not to conduct its own fresh review of the arbitral record. A party hoping that a second round before a different bench will produce a different reading of the facts is usually disappointed, because the appellate court reviews the first court's application of the test rather than re-running the Section 34 hearing from scratch.

This two-layer narrowness is deliberate, and it reflects the statute's underlying assumption that an arbitration award is meant to be close to final. Each layer of review exists to police clear excesses, not to give a losing party successive chances at relitigating a case it has already lost once. A client should budget for this when deciding how much a second round is actually worth pursuing.

Frequently Asked Questions

References & Further Reading

The provisions and rulings below were relied on for this guide. The position can change with amendments and later decisions, so check the current text and the latest case law before acting on any of it.

1. Arbitration and Conciliation Act, 1996, Section 34(2A) and proviso (patent illegality ground limited to domestic awards; not available for mere erroneous application of law or re-appreciation of evidence)
2. Arbitration and Conciliation Act, 1996, Section 34(3) (three-month limitation, extendable by thirty days only on sufficient cause)
3. Arbitration and Conciliation Act, 1996, Section 37 (appeal confined to reviewing the Section 34 court's application of the grounds, not a fresh review of the award)
4. Ssangyong Engineering & Construction Co. Ltd. v. National Highways Authority of India (2019) (patent illegality standard: a view no fair-minded or reasonable person could take)
5. Reliance Infrastructure Ltd. v. State of Goa (Supreme Court, 2023) (illegality must be apparent on the face of the award, not assembled from the pleadings and evidence)
6. Haryana Urban Development Authority v. Mehta Construction Co. (Supreme Court, 2022) (erroneous application of law or misappreciation of evidence does not amount to patent illegality)