Arbitration runs on the twin engines of party autonomy and finality. Section 4 of the Arbitration and Conciliation Act, 1996 protects both by penalising the party who sits on a known objection: if you know that a derogable provision of Part I or a requirement of the arbitration agreement has not been complied with, and you nonetheless proceed without protesting without undue delay, you are deemed to have waived your right to object. This is the statutory embodiment of the maxim that the law aids the vigilant, not those who sleep on their rights, and it is the silent backbone behind much of the jurisprudence on jurisdictional challenges, tribunal composition and procedural irregularities. This note unpacks the text, the doctrinal underpinnings, the all-important requirement of knowledge, and the leading authorities — from Narayan Prasad Lohia to Bharat Broadband and Quippo Construction — that map the limits of what can, and cannot, be waived.
The Statutory Text of Section 4
Section 4 of the Arbitration and Conciliation Act, 1996, headed Waiver of right to object, reads: "A party who knows that—(a) any provision of this Part from which the parties may derogate, or (b) any requirement under the arbitration agreement, has not been complied with and yet proceeds with the arbitration without stating his objection to such non-compliance without undue delay or, if a time limit is provided for stating that objection, within that period of time, shall be deemed to have waived his right to so object."
The provision is modelled on Article 4 of the UNCITRAL Model Law on International Commercial Arbitration, 1985, which India adopted as the template for the 1996 Act. The drafting is deliberately economical, but four building blocks emerge: (i) the party must know of the non-compliance; (ii) the non-compliance must relate to a derogable provision of Part I or to a requirement under the arbitration agreement; (iii) the party must nonetheless proceed with the arbitration; and (iv) the party must fail to object without undue delay or within any stipulated time limit. Only when all four are satisfied does the deeming clause bite and the right to object stand extinguished. Section 4 forms part of the foundational machinery of Part I, sitting between the definitions in Section 2 and the deeming rules on receipt of written communications in Section 3.
Rationale: Estoppel, Acquiescence and Finality
Section 4 codifies a cluster of common-law doctrines — waiver, estoppel and acquiescence — into a single statutory deeming provision tailored to arbitration. The underlying policy is twofold. First, it protects the integrity and finality of the arbitral process: a party should not be allowed to participate in proceedings, take its chance on a favourable award, and then ambush the process by raising a defect it knew about all along. Second, it reinforces party autonomy: because the parties are masters of their own procedure, they are equally free to abandon procedural protections they have been given.
The Supreme Court has repeatedly described the philosophy in terms of the doctrine of election — a party cannot approbate and reprobate. To allow a litigant to lie in wait, keep a known objection in reserve, and deploy it only after an adverse award would defeat the speedy and efficient dispute resolution that the Act is designed to deliver. As the Court observed in Quippo Construction Equipment Ltd. v. Janardan Nirman (P) Ltd., (2020) 18 SCC 277, an arbitral tribunal is fundamentally a creature of contract; if a party has a right to object but chooses not to exercise it, that right is deemed waived. Section 4 thus works hand-in-glove with the kompetenz-kompetenz scheme of Section 16 and the limited grounds of challenge under Section 34, ensuring that procedural defects are flushed out early rather than warehoused for a collateral attack.
The Indispensable Requirement of Knowledge
The opening words "A party who knows" make knowledge the gateway to waiver. There can be no deemed waiver of a defect of which the party was genuinely unaware. This is consistent with the general law of waiver, where the abandonment of a right presupposes awareness of its existence. A party cannot waive what it does not know it possesses.
This requirement was squarely addressed in Narayan Prasad Lohia v. Nikunj Kumar Lohia, (2002) 3 SCC 572, where one argument was that Section 4 could not deem a waiver of a fundamental infirmity. The Supreme Court clarified that reliance on Section 4 to deem legal infirmities waived is well-founded only where the party knowingly proceeds despite awareness of the non-compliance. The provision therefore demands actual or constructive knowledge of the specific derogation, not a vague or general awareness that something might be amiss. In practice, knowledge is usually established by the procedural record — the stage at which the relevant facts became apparent, the pleadings filed thereafter, and whether the party flagged the issue. Where a defect is patent on the face of the proceedings (for example, an even-numbered tribunal), knowledge is readily inferred. Where it is latent, the burden of showing awareness is correspondingly heavier.
Derogable Versus Mandatory Provisions
Section 4(a) operates only on "any provision of this Part from which the parties may derogate". This is the doctrinal fulcrum of the whole section. Part I of the Act contains a mix of mandatory provisions, which the parties cannot contract out of, and non-mandatory (derogable) provisions, which apply only in default of contrary agreement. Section 4 reaches only the latter. A non-compliance with a mandatory provision — for instance, the duty of independence and impartiality embedded in the proviso to Section 12(5) read with the Seventh Schedule — cannot be cured by mere inaction, because the parties were never free to derogate from it in the first place.
Distinguishing the two categories is therefore a precondition to applying Section 4. Provisions phrased as defaults — typically introduced by the words "unless otherwise agreed by the parties" or "the parties are free to" — are derogable. Thus Section 10, which opens "The parties are free to determine the number of arbitrators", is derogable; so are the procedural choices in Sections 19, 20, 22, 23 and 24. By contrast, provisions safeguarding the structural fairness of the process — equal treatment under Section 18, the eligibility bar in Section 12(5), and the public-policy controls in Section 34 — are mandatory and stand outside Section 4. This is why the form-and-validity rules in Section 7 cannot simply be waived away by silence: a missing arbitration agreement is a question of existence, not a derogable procedural default.
Narayan Prasad Lohia: The Leading Authority
The most authoritative exposition of Section 4 remains the three-Judge Bench decision in Narayan Prasad Lohia v. Nikunj Kumar Lohia, (2002) 3 SCC 572. The dispute, between members of a family business, was referred to two arbitrators. After the award went against them, the objectors challenged it under Section 34 on the ground that a two-member tribunal contravened Section 10, which contemplates that the number of arbitrators "shall not be an even number". A single Judge of the Calcutta High Court set the award aside on that footing.
The Supreme Court reversed. It held that Section 10 is a derogable provision: because it opens with the words "The parties are free to determine the number of arbitrators", the prohibition on an even number is not a non-derogable mandate but a default that the parties may displace by agreement. Crucially, the Court read Sections 10, 16 and 4 together. Section 16(2) requires a plea that the tribunal lacks jurisdiction (which includes a plea regarding its composition) to be raised not later than the submission of the statement of defence. Since the objectors had participated throughout and had not raised any objection to the even-numbered tribunal at the appropriate stage, they were deemed under Section 4 to have waived the right to object. The Court further held that, once the composition accorded with the parties' agreement, Section 34 did not permit a challenge merely on the ground that the composition conflicted with Part I. Lohia thus established the template: identify whether the provision is derogable, locate the time limit for objection (often supplied by Section 16), and apply Section 4 to deem the waiver where the party proceeded in silence.
Section 4, Section 16 and Jurisdictional Objections
Section 4 frequently operates in tandem with Section 16, the kompetenz-kompetenz provision that empowers the tribunal to rule on its own jurisdiction. Section 16(2) supplies the very "time limit" that the closing words of Section 4 contemplate: a plea that the tribunal lacks jurisdiction must be raised "not later than the submission of the statement of defence". Importantly, Section 16(2) also provides that a party is not precluded from raising such a plea merely because it appointed, or participated in the appointment of, an arbitrator — a deliberate limit on the reach of waiver.
The interaction was illustrated in MSP Infrastructure Ltd. v. Madhya Pradesh Road Development Corporation Ltd., (2015) 13 SCC 713, where the Supreme Court held that all objections to jurisdiction, of whatever nature, must ordinarily be taken at the stage of the statement of defence and dealt with under Section 16; a party that fails to do so risks a deemed waiver. The position was subsequently recalibrated by a three-Judge Bench in Lion Engineering Consultants v. State of M.P., (2018) 16 SCC 758, which partly overruled MSP Infrastructure and held that a plea of lack of jurisdiction may still be raised under Section 34 even if it was not raised under Section 16(2). The two strands of authority should be read together: pure procedural and composition objections are governed tightly by the Section 4/Section 16 timing rules, whereas certain fundamental questions of jurisdiction may survive for a Section 34 challenge.
Quippo Construction: Waiver by Conduct in Practice
The modern application of Section 4 is best seen in Quippo Construction Equipment Ltd. v. Janardan Nirman (P) Ltd., (2020) 18 SCC 277. The parties had entered into multiple equipment-hire agreements; three nominated New Delhi as the venue while a fourth named Kolkata. The arbitrator consolidated the disputes and conducted a single proceeding at Delhi. The respondent stayed away from the arbitration altogether and later attacked the award, contending that the venue and the consolidation were impermissible.
A Bench of Justices Uday Umesh Lalit and Vineet Saran rejected the challenge. The Court held that, having received due notice and opportunity, the respondent could not object to the venue, the consolidation, or the scope of the tribunal's authority when it had failed to raise any such objection during the proceedings. Applying Section 4 in harness with Section 16(2), the Court reasoned that the choice of venue is a derogable matter: a party is free not to object within the time prescribed by Section 16(2), and if it chooses not to do so, there is a deemed waiver under Section 4. The case is a clear demonstration that even a non-participating respondent — who received notice but stayed away — cannot resurrect a known procedural objection after the award. Silence, in the face of knowledge, is fatal.
The Outer Limit: Bharat Broadband and Section 12(5)
Section 4 is powerful, but it is not omnipotent. Its outer boundary is sharply drawn by Bharat Broadband Network Ltd. v. United Telecoms Ltd., (2019) 5 SCC 755. The question was whether an arbitrator who was de jure ineligible under Section 12(5) read with the Seventh Schedule (he had a prohibited relationship with one of the parties) could be retained because the objecting party had not protested earlier. The Supreme Court held that he could not.
The Court drew a critical distinction between the two waiver regimes. Section 4 permits waiver by conduct — deemed, implied, inferred from silence and participation. But the proviso to Section 12(5) carves out a special, stricter rule for arbitrator ineligibility: that ineligibility can be waived only by an express agreement in writing entered into after the disputes have arisen. The Court held that merely recording "no objection" in a procedural order, filing pleadings, or jointly applying for an extension of time under Section 29A does not satisfy the proviso. Such conduct might amount to a valid waiver under Section 4, but it is insufficient to cure the statutory ineligibility under Section 12(5). Bharat Broadband therefore confirms that the conduct-based waiver of Section 4 cannot override a mandatory, non-derogable safeguard for which Parliament has prescribed a more demanding mode of waiver. It is the clearest judicial signpost of where Section 4 stops.
"Without Undue Delay": The Timing Element
The temporal trigger of Section 4 has two limbs. Where the relevant provision or the agreement itself fixes a time limit for objecting, the party must object within that period — the most common example being the Section 16(2) cut-off at the statement of defence, and the Section 13(2) window of fifteen days for challenging an arbitrator. Where no specific time limit is prescribed, the party must object "without undue delay".
What counts as undue delay is a fact-sensitive inquiry turning on the nature of the defect, the stage of the proceedings, and the conduct of the parties. The guiding principle is that the objection should be raised at the earliest reasonable opportunity after the party becomes aware of the non-compliance, so that the defect can be cured before further costs are incurred and before the tribunal proceeds to award. A party that continues to lead evidence, file submissions and seek reliefs after becoming aware of a curable defect, without flagging it, will struggle to escape the deeming clause. The timing element thus reinforces the section's anti-ambush purpose: objections are to be made contemporaneously, not banked for a rainy day.
What Cannot Be Waived Under Section 4
Several categories fall outside the reach of Section 4, and recognising them is essential for exam answers. First, mandatory provisions of Part I cannot be waived — including the duty of equal treatment under Section 18 and the public-policy and patent-illegality controls under Section 34, which protect interests transcending the immediate parties. Second, the ineligibility of an arbitrator under Section 12(5) can be relinquished only by an express written agreement after disputes arise, as Bharat Broadband Network Ltd. v. United Telecoms Ltd., (2019) 5 SCC 755 makes plain — conduct-based Section 4 waiver will not do. Third, the very existence of a valid arbitration agreement under Section 7 is a jurisdictional precondition, not a derogable default; a tribunal cannot acquire authority by waiver where no agreement to arbitrate exists. Fourth, the non-arbitrability of a subject matter — matters reserved by public policy for adjudication by courts or special fora — cannot be conferred on a tribunal merely because the parties failed to object. Section 4 abandons procedural protections; it does not manufacture jurisdiction or sanitise an inherently illegal reference.
Interplay With the Broader Act
Section 4 is best understood not in isolation but as the connective tissue of Part I. It supplies the doctrinal engine behind Section 16(2) (jurisdictional objections to be raised by the statement of defence), Section 13 (challenges to arbitrators within fifteen days), and the consequences that flow under Section 34 when a party has slept on a known defect. It complements Section 3, which deems communications received, by similarly deeming objections waived — both are deeming provisions that promote certainty and forward momentum. It also coexists with the court's gatekeeping powers: when a judicial authority exercises its power to refer parties to arbitration under Section 8, or grants interim measures under Section 9, the conduct of the parties before the tribunal will later be measured against the Section 4 yardstick. For a structured overview of how these provisions fit together, see the Arbitration and Conciliation Act notes hub. The cumulative effect is a statutory scheme that rewards vigilance and penalises strategic silence.
Exam Pointers and Common Traps
For judiciary and CLAT-PG aspirants, a handful of crisp propositions repay memorisation. Section 4 is derived from Article 4 of the UNCITRAL Model Law. Its four ingredients are knowledge, a derogable provision or agreement requirement, continued participation, and absence of timely objection. The watchword case is Narayan Prasad Lohia, (2002) 3 SCC 572, holding Section 10 derogable and the even-number objection waived. The watchword limit is Bharat Broadband, (2019) 5 SCC 755, holding that Section 12(5) ineligibility needs an express written waiver and cannot be cured by conduct. The watchword application case is Quippo Construction, (2020) 18 SCC 277, on waiver of venue and consolidation objections by a non-objecting party.
Common traps to avoid: do not state that any defect can be waived — only derogable ones can; do not confuse the conduct-based Section 4 waiver with the express-written waiver mandated for Section 12(5); and do not forget that Section 16(2) preserves the right to object even after appointing an arbitrator, so participation in appointment is not itself a waiver. Finally, always anchor the answer in the knowledge requirement: no knowledge, no waiver.
Frequently asked questions
What is the doctrine underlying Section 4 of the Arbitration and Conciliation Act, 1996?
Section 4 codifies the common-law doctrines of waiver, estoppel and acquiescence into a statutory deeming provision. A party who knows of non-compliance with a derogable provision of Part I or with a requirement of the arbitration agreement, yet proceeds without objecting without undue delay, is deemed to have waived the right to object. It is modelled on Article 4 of the UNCITRAL Model Law and serves the policy of finality and party autonomy.
Can a party waive a non-compliance with a mandatory provision under Section 4?
No. Section 4(a) applies only to provisions of Part I "from which the parties may derogate" — that is, non-mandatory or default provisions. Mandatory safeguards, such as the equal-treatment rule in Section 18 or the public-policy controls in Section 34, fall outside Section 4 and cannot be waived by mere silence or participation.
What did the Supreme Court hold in Narayan Prasad Lohia v. Nikunj Kumar Lohia?
In Narayan Prasad Lohia v. Nikunj Kumar Lohia, (2002) 3 SCC 572, a three-Judge Bench held that Section 10 (number of arbitrators) is a derogable provision and that parties who failed to object to a two-member tribunal at the stage of the statement of defence, as required by Section 16(2), were deemed under Section 4 to have waived the objection. The award could not therefore be set aside under Section 34 merely because the tribunal had an even number of members.
Why can Section 12(5) ineligibility not be cured by a Section 4 waiver?
Because Parliament prescribed a stricter mode of waiver for arbitrator ineligibility. In Bharat Broadband Network Ltd. v. United Telecoms Ltd., (2019) 5 SCC 755, the Supreme Court held that the de jure ineligibility under Section 12(5) read with the Seventh Schedule can be waived only by an express agreement in writing made after disputes arise. Conduct-based waiver under Section 4 — such as recording "no objection" or filing pleadings — is insufficient to remove that statutory ineligibility.
How does Section 4 interact with Section 16 on jurisdictional objections?
Section 16(2) supplies the time limit that the closing words of Section 4 contemplate: a plea that the tribunal lacks jurisdiction must be raised not later than the submission of the statement of defence. A party that fails to object within that window may be deemed to have waived the point. However, Section 16(2) expressly preserves the right to object even where the party appointed or participated in appointing the arbitrator, so participation in appointment is not itself a waiver.
Can a party that did not participate in the arbitration still rely on a procedural objection later?
Not for derogable procedural matters of which it had notice. In Quippo Construction Equipment Ltd. v. Janardan Nirman (P) Ltd., (2020) 18 SCC 277, the Supreme Court held that a respondent who received due notice but stayed away from the arbitration could not later challenge the venue or the consolidation of disputes. Having failed to raise the objection within the Section 16(2) timeframe, it was deemed under Section 4 to have waived the right to object.