From N.N. Global to In Re Interplay: the eight-month doctrinal arc that restored Indian arbitration to its separability footing

Between 25 April and 13 December 2023, the Supreme Court of India twice convened a Constitution Bench to decide the same statutory question — and reached opposite answers. The first answer, delivered by a five-judge bench in N.N. Global Mercantile Pvt Ltd v. Indo Unique Flame Ltd by a 3:2 majority, was that an arbitration agreement contained in an unstamped instrument was unenforceable and could not be acted upon under Section 11 of the Arbitration and Conciliation Act 1996. The second answer, delivered eight months later by a seven-judge bench in In Re: Interplay between Arbitration Agreements under the Arbitration and Conciliation Act, 1996 and the Indian Stamp Act, 1899 unanimously overruled N.N. Global — holding that non-stamping was a curable defect of admissibility under Section 35 of the Indian Stamp Act 1899, not a sword that severed the arbitration agreement at the door of the referral court.

The compression of the arc is itself remarkable. The Court that hears a five-judge Constitution Bench reference does not, in ordinary course, return to the same question with a seven-judge bench within the same calendar year. The fact that it did so — by way of a curative reference framed at the highest level of generality, captioned not by adversarial party names but as an interpretive question between two statutes — registers the seriousness with which the Court treated the consequences of N.N. Global for the architecture of Indian arbitration. In Re Interplay is, accordingly, both an overruling and a course-correction. It is the operative authority on the relationship between an unstamped arbitration agreement and the referral court's powers, and it is the basis on which subsequent Section 11 jurisprudence — Adavya Projects, Office for Alternative Architecture, Motilal Oswal Financial Services, and most recently Tarini Prasad Mohanty v. Sunflag Iron & Steel (2026 INSC 566) — has uniformly proceeded.

The constitutional and statutory architecture

The dispute that produced the eight-month arc rested at the intersection of two statutes that, on a faithful reading, are not in conflict at all. The interpretive controversy arose because earlier decisions had read the Indian Stamp Act 1899 into the Arbitration and Conciliation Act 1996 at the wrong stage and with disproportionate force.

The Arbitration and Conciliation Act 1996 — modelled on the UNCITRAL Model Law — is built on four interlocking provisions for present purposes. Section 7 defines an arbitration agreement and prescribes the formal requirements: writing, and either a signed document, an exchange of communications, or a statement of claim and defence in which the existence of the agreement is alleged by one party and not denied by the other. Section 8 requires a judicial authority before which an action is brought in a matter that is the subject of an arbitration agreement to refer the parties to arbitration, unless it finds that prima facie no valid arbitration agreement exists. Section 11 provides for the appointment of arbitrators by the Court where parties' agreed mechanism fails. Section 16 embodies the kompetenz-kompetenz principle: the arbitral tribunal is competent to rule on its own jurisdiction, including objections to the existence or validity of the arbitration agreement, and for that purpose the arbitration clause is to be treated as an agreement independent of the other terms of the contract.

The Indian Stamp Act 1899 operates at a different doctrinal layer. Section 33 obliges every person having authority to receive evidence — and every public officer (other than a police officer) before whom an instrument is produced in the performance of his functions — to impound any instrument chargeable with duty that is not duly stamped. Section 35 prescribes the consequence: an instrument chargeable with duty shall not be admitted in evidence for any purpose by any person having authority by law or consent of parties to receive evidence, or shall be acted upon, registered or authenticated by any such person or by any public officer, unless duly stamped. The proviso to Section 35 allows the instrument to be admitted on payment of the duty and the penalty.

The architectural point — which In Re Interplay would later make the keystone of its reasoning — is that Section 35 speaks to admissibility, not to validity. An unstamped instrument is not void; it is inadmissible until the stamp deficiency is cured. The Indian Stamp Act 1899 is a fiscal statute designed to secure the State's revenue interest; it is not a charter of contract validity.

The factual matrix and the curative reference

N.N. Global Mercantile Pvt Ltd v. Indo Unique Flame Ltd arose from a sub-contract between Indo Unique Flame Ltd, a coal-washery operator, and N.N. Global Mercantile, its sub-contractor for transportation work. The sub-contract contained an arbitration clause. A bank guarantee dispute escalated, and the parties moved through the Section 8 and Section 9 machinery — leading to a referral question whether the arbitration clause, embedded in a sub-contract that was insufficiently stamped, could be acted upon.

The doctrinal context was already crowded. SMS Tea Estates Pvt Ltd v. Chandmari Tea Co. Pvt Ltd (2011) 14 SCC 66 had held that an arbitration clause in an unstamped lease deed could not be acted upon until the deed was duly stamped. Garware Wall Ropes Ltd v. Coastal Marine Constructions and Engineering Ltd (2019) 9 SCC 209 had endorsed the SMS Tea Estates line. Vidya Drolia v. Durga Trading Corporation (2021) 2 SCC 1 had, in passing, affirmed Garware Wall Ropes. N.N. Global I — a three-judge decision in 2021 — disagreed and referred the question to a Constitution Bench. The reference produced the N.N. Global II five-judge decision of 25 April 2023.

When the consequences of N.N. Global II became apparent — both for the practical operation of Section 11 and for the doctrinal coherence of the separability principle — a curative reference was constituted. The question was reframed at the highest level of generality: what is the interplay between the arbitration architecture under the Arbitration and Conciliation Act 1996 and the stamping architecture under the Indian Stamp Act 1899? The seven-judge bench convened in November 2023 and delivered its unanimous judgment on 13 December 2023.

N.N. Global (April 2023): the five-judge majority view

The five-judge bench in N.N. Global II comprised K.M. Joseph, J. (authoring the majority), Ajay Rastogi, J. (dissenting), Aniruddha Bose, J. (with the majority), Hrishikesh Roy, J. (dissenting), and C.T. Ravikumar, J. (with the majority and writing a concurring addendum). The split was 3:2.

The majority's reasoning proceeded through three propositions. First, an instrument chargeable with stamp duty that is not duly stamped is not "enforceable in law" within the meaning of Section 2(g) read with Section 2(h) of the Indian Contract Act 1872. An unenforceable instrument cannot generate an arbitration agreement that the referral court may give effect to. Second, Section 11(6A) of the Arbitration and Conciliation Act 1996 — which confined the referral court's examination to the "existence" of the arbitration agreement — did not displace the Section 33 obligation. The referral court, being an authority that received the instrument in the performance of its judicial function, was bound to impound it under Section 33 and could not act upon it under Section 11. Third, the separability doctrine, on the majority's reading, did not assist. An arbitration clause is severable from a substantive contract that is void or voidable for other reasons, but it cannot survive in an instrument that has not entered legal existence at all for want of stamping.

The dissent of Ajay Rastogi, J., joined in substance by Hrishikesh Roy, J., attacked the majority on three grounds. First, the conflation of validity and admissibility: Section 35 of the Indian Stamp Act 1899 operated only at the admissibility stage and did not affect the underlying validity of the instrument. The defect was curable on payment of duty and penalty. Second, the displacement of separability: the arbitration agreement under Section 7 of the Arbitration and Conciliation Act 1996 was independent of the underlying contract, and a fiscal defect in the larger instrument should not be permitted to destroy the agreement to arbitrate. Third, the practical consequence: by routing every stamping objection through the referral court before any arbitration could commence, the majority's reading would import into Section 11 a preliminary examination wholly inconsistent with the legislative design that confined the referral court to the existence question.

The concurring addendum of C.T. Ravikumar, J. was directed primarily at the procedural mechanics of impounding and did not displace the substantive majority view. The 3:2 split was the operative outcome: an arbitration agreement in an unstamped instrument was unenforceable and the referral court was obliged to impound rather than appoint.

In Re Interplay (December 2023): the seven-judge overruling

The seven-judge bench in In Re Interplay — Dr D.Y. Chandrachud, C.J., Sanjay Kishan Kaul, J., Sanjiv Khanna, J., B.R. Gavai, J., Surya Kant, J., J.B. Pardiwala, J. and Manoj Misra, J. — unanimously overruled N.N. Global II. The judgment's reasoning rests on four interlocking propositions.

The architectural distinction between validity and admissibility. The Court held — recovering the dissent's central insight from N.N. Global II — that Section 35 of the Indian Stamp Act 1899 operates only at the level of admissibility in evidence. An unstamped instrument is not void; it is inadmissible until the stamp deficiency is cured. The Indian Stamp Act 1899 is a fiscal statute designed to secure the State's revenue and to protect the State's interest in the realisation of duty; it is not a charter of contract validity. The earlier line that had used Section 35 to declare unstamped instruments "unenforceable" for arbitration purposes was a doctrinal conflation that had to be corrected.

Separability of the arbitration agreement. Section 7 of the Arbitration and Conciliation Act 1996 defines an arbitration agreement; Section 16 declares it severable from the underlying contract for jurisdictional purposes. The arbitration agreement is, on the Court's reading, a legally distinct undertaking. A defect in the larger instrument — whether a stamping defect, a substantive defect of formation, or a contention of voidness — does not, of itself, destroy the agreement to arbitrate. The separability principle is the conceptual hinge: the agreement to arbitrate survives the alleged infirmity of the underlying contract, and is referred to the tribunal that the parties' agreement has constituted.

Kompetenz-kompetenz. Section 16 of the Arbitration and Conciliation Act 1996 vests in the arbitral tribunal the competence to rule on its own jurisdiction. Objections to the existence or validity of the arbitration agreement — including objections rooted in stamping — are for the tribunal in the first instance. The referral court's role at the Section 8 and Section 11 stage is confined, after the 2015 Amendment Act's insertion of Section 11(6A), to a prima facie examination of the existence of the arbitration agreement. The referral court does not, at that stage, adjudicate stamping; it leaves stamping to the tribunal.

The narrowing of the referral court's role. The Court tied its reading to the legislative design of the 2015 amendments to the Arbitration and Conciliation Act 1996. Section 11(6A) — though formally omitted by the 2019 Amendment Act (a notification deferred) — articulated Parliament's intent that the referral court's role at the appointment stage should be confined to the existence question. N.N. Global II, by reading a stamping pre-examination into the referral court's powers, had inverted the legislative design. The course-correction in In Re Interplay restores the referral court to its narrow function and routes stamping to the tribunal where it doctrinally belongs.

The Court was careful to record that the Indian Stamp Act 1899 obligations are not displaced. The instrument remains chargeable; the duty remains payable; the tribunal — like every other authority receiving evidence — is bound by Section 33 to impound an unstamped instrument produced before it and to direct payment of duty and penalty before the instrument can be admitted in evidence. What is displaced is only the use of Section 35 as a sword that severs the arbitration agreement at the door of the referral court.

The doctrinal contribution

In Re Interplay restored to Indian arbitration jurisprudence three architectural propositions that N.N. Global II had unsettled.

First, the separability of the arbitration agreement from the underlying contract — a foundational principle of modern international arbitration and the textual command of Section 16 of the Arbitration and Conciliation Act 1996. After In Re Interplay, the proposition is again uncontroversial: the arbitration agreement is a distinct undertaking, and infirmities in the underlying contract do not, of themselves, destroy it.

Second, the kompetenz-kompetenz principle — the tribunal's competence to rule on its own jurisdiction. The referral court's role is the prima facie existence question; substantive jurisdictional objections, including stamping, are for the tribunal under Section 16. The architecture is consonant with the global mainstream and with the design of the 2015 amendments to the Arbitration and Conciliation Act 1996.

Third, the disciplined narrowness of the referral court's enquiry. The post-In Re Interplay Section 11 jurisprudence — Adavya Projects v. Vishal Structurals, Office for Alternative Architecture v. IIA, Motilal Oswal Financial Services and the 2026 reaffirmation in Tarini Prasad Mohanty v. Sunflag Iron & Steel — has uniformly applied the prima facie existence standard. The referral court does not adjudicate the merits, does not adjudicate stamping, does not adjudicate complex arbitrability disputes that turn on contested facts; it makes a preliminary determination on existence and refers.

What the judgment did not decide

In Re Interplay should not be read as a charter of stamping immunity. Three limits should be flagged in any practitioner's note on the judgment.

First, the Indian Stamp Act 1899 obligations remain in force. Every instrument chargeable with duty must be duly stamped; non-payment attracts the Section 33 impounding obligation and the Section 35 inadmissibility consequence wherever the instrument is sought to be admitted in evidence — including before the arbitral tribunal. The tribunal is not exempt from Section 33. The judgment restores the procedural ordering: stamping is a tribunal-stage question, not a referral-court-stage question. It does not extinguish stamping.

Second, the curability of the stamping defect operates through the Section 35 proviso — payment of duty and penalty. The tribunal will, on application, direct payment and admit the instrument in evidence. Until the deficiency is cured, the instrument cannot be relied upon as evidence of the substantive contract before the tribunal. The arbitration agreement, by separability, is unaffected; the tribunal proceeds with the reference. But the substantive case on the merits may be impaired if the underlying contract remains inadmissible because the stamping defect has not been cured.

Third, the judgment does not displace the Section 8 and Section 11 enquiry into the existence of the arbitration agreement. The referral court remains entitled — and obliged — to satisfy itself, on a prima facie examination, that an arbitration agreement exists. Where the document on its face does not contain an arbitration clause, where the signatures are obviously forged, where the parties' identity is contested as a foundational matter, the existence question may still be answered in the negative by the referral court without trespassing on the tribunal's domain.

The doctrinal arc

The arc, end-to-end, now reads as a fifteen-year course-correction.

SMS Tea Estates Pvt Ltd v. Chandmari Tea Co. Pvt Ltd (2011) 14 SCC 66 was the originating misstep. A two-judge bench held that an arbitration clause in an unstamped lease deed could not be acted upon until the deed was duly stamped. The reasoning rested on the Section 33 impounding obligation read at the referral stage — an early conflation of admissibility and validity.

Garware Wall Ropes Ltd v. Coastal Marine Constructions and Engineering Ltd (2019) 9 SCC 209 reinforced SMS Tea Estates in the context of the post-2015 Section 11(6A) architecture. The decision was, with hindsight, the high-water mark of the conflated reading.

Vidya Drolia v. Durga Trading Corporation (2021) 2 SCC 1 — primarily an arbitrability decision — endorsed Garware Wall Ropes in passing, locking the line into the broader arbitrability rubric. The endorsement was not the case's ratio but it carried weight.

N.N. Global Mercantile Pvt Ltd v. Indo Unique Flame Ltd (April 2023) — the five-judge 3:2 — represented the apogee of the conflated reading. The majority's authorisation of pre-arbitration stamping examination by the referral court would, if implemented, have routinely deferred arbitration references for years pending stamping disputes.

In Re Interplay (December 2023) — the seven-judge unanimous overruling — corrected the arc. SMS Tea Estates, Garware Wall Ropes and N.N. Global II were all displaced to the extent inconsistent with the In Re Interplay holding. The separability and kompetenz-kompetenz framework was restored.

Tarini Prasad Mohanty v. Sunflag Iron & Steel (2026 INSC 566) is the most recent reaffirmation. The Court reiterated that stamping objections are for the tribunal under Section 16 and held that writ jurisdiction cannot be invoked to challenge a tribunal's stamping decision — the corollary of the In Re Interplay ordering. "Jurisdiction to decide cannot mean to decide in a particular manner" is the phrase the Court used.

What practitioners take from the arc today

For counsel moving a Section 8 or Section 11 application, the operative position is straightforward. The referral court will not, after In Re Interplay, refuse to refer the matter to arbitration on the ground that the underlying instrument is unstamped or insufficiently stamped. The pleading should foreground the existence of the arbitration agreement — Section 7 form, the parties' acceptance — and leave stamping for the tribunal. The respondent who pleads stamping at the referral stage will, in the ordinary course, be met with In Re Interplay and referred.

For counsel resisting a reference, the strategic shift is to find a Section 7 existence defect — a contention that the document does not, on its face, contain an arbitration agreement at all, or that the signatures are not those of the resisting party, or that the agreement was conditional and the condition has not been fulfilled. Stamping objections, after In Re Interplay, do not stop the reference; they reserve themselves for the tribunal where the underlying contract may be sought to be admitted in evidence.

For counsel before the arbitral tribunal, the tribunal-stage discipline is critical. Where the underlying contract is unstamped and is sought to be admitted in evidence to prove substantive terms, the tribunal is bound to impound under Section 33 and to require payment of duty and penalty before admission. Counsel relying on the contract should be prepared to cure the deficiency; counsel resisting should make the Section 35 objection at the right stage and on the record.

For drafting practice, the lesson of the eight-month arc is simple: stamp the contract. The In Re Interplay discipline does not licence neglect of stamping obligations; it relocates the consequences of neglect to the tribunal stage and confines them to admissibility. The cost of delay in stamping — measured in tribunal-stage applications, payment of penalty, and the strategic friction at the merits stage — is real even if the path to the tribunal is no longer blocked.

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