Independence and impartiality are the twin pillars on which the legitimacy of arbitration rests. The Arbitration and Conciliation (Amendment) Act, 2015, lifted directly from the IBA Guidelines on Conflicts of Interest in International Arbitration, hard-wired these values into the statute through two new schedules. The Fifth Schedule supplies a thirty-four item checklist of relationships and circumstances that give rise to justifiable doubts as to an arbitrator's independence or impartiality, guiding the disclosure that Section 12(1) now compels. The Seventh Schedule goes further: it lists relationships so corrosive of neutrality that a person falling within them is rendered ineligible to be appointed at all under the non-obstante mandate of Section 12(5). This article maps the architecture of the two schedules, the doctrinal line the Supreme Court has drawn between "challenge" and "ineligibility", and the landmark decisions — from TRF and Voestalpine to Perkins and the Constitution Bench in CORE — that have given them teeth.
The Statutory Architecture: Section 12 and the Two Schedules
Section 12 of the Arbitration and Conciliation Act, 1996, is the gateway through which every prospective arbitrator must pass. As recast by the 2015 Amendment, it operates on three levels. First, Section 12(1) imposes a continuing duty of disclosure: a person approached for possible appointment must declare, in writing, any past or present relationship with or interest in the parties, their counsel, or the subject-matter of the dispute, and any circumstance — such as the time he can devote or his ability to complete the arbitration within twelve months — that is likely to affect his neutrality. The Explanation to Section 12(1) expressly directs that the grounds in the Fifth Schedule shall guide what must be disclosed, and Section 12(2) makes the duty a continuing one, requiring the arbitrator to disclose such circumstances throughout the arbitral proceedings and not merely at the threshold.
Second, Section 12(3) sets out the substantive grounds for a challenge: an arbitrator may be challenged only if circumstances exist that give rise to justifiable doubts as to his independence or impartiality, or if he does not possess the qualifications agreed by the parties. The two grounds are distinct — independence concerns the arbitrator's objective relationships and interests, while impartiality concerns his subjective state of mind, his freedom from predisposition toward one side. Third, and most drastically, Section 12(5) — a wholly new provision — declares that, notwithstanding any prior agreement to the contrary, any person whose relationship with the parties, counsel, or subject-matter falls within any of the categories in the Seventh Schedule shall be ineligible to be appointed as an arbitrator. The distinction between the two schedules is therefore not cosmetic: the Fifth Schedule informs disclosure and grounds a challengeable doubt, whereas the Seventh Schedule operates automatically, by force of law, to disqualify.
The legislative pedigree of this scheme matters. Before 2015, the unamended Section 12 left independence and impartiality largely to the parties' own contractual stipulations and to a generalised standard, which proved inadequate in the face of one-sided clauses common in government and infrastructure contracts. The 246th Law Commission Report identified this gap and recommended importing objective, enumerated standards from the IBA Guidelines. The result was the twin-schedule architecture, designed to convert a vague aspiration toward neutrality into a workable, predictable rulebook. Readers new to the framework should first consult the Arbitration and Conciliation Act hub and the note on the definitions of arbitration, arbitral tribunal and court for context.
The Fifth Schedule: Grounds Giving Rise to Justifiable Doubts
The Fifth Schedule contains thirty-four enumerated grounds, organised under heads such as the arbitrator's relationship to the parties or counsel, his relationship to the dispute, his interest in the dispute, and previous services for one of the parties or other involvement in the case. Examples include the arbitrator being an employee, consultant, advisor or having a past business relationship with a party; the arbitrator's law firm currently rendering services to a party; the arbitrator having previously advised or given an expert opinion on the dispute; or the arbitrator having a close family relationship with a party. The Schedule is illustrative and explanatory rather than exhaustive — it functions, in the language of the courts, as a guide to the disclosure that Section 12(1) demands and to the justifiable doubts that may ground a challenge under Section 12(3).
Crucially, falling within a Fifth Schedule ground does not automatically disqualify. It triggers a duty to disclose and exposes the arbitrator to a challenge, but the tribunal (and ultimately the court under Section 34) must still assess whether the circumstance, judged objectively, would lead a reasonable and fair-minded person to apprehend bias. As the local doctrine consistently affirms, not every suspicion or subjective dissatisfaction suffices; the apprehension must be such that a reasonable person, apprised of the facts, would entertain justifiable doubts. The Fifth Schedule thus calibrates a flexible, fact-sensitive standard rather than a bright-line bar.
The breadth of the Fifth Schedule is deliberate. It captures not only direct relationships with the parties but also relationships with their counsel, with affiliated companies in the same group, and with the dispute itself — for instance where the arbitrator or his firm has previously been involved in the case, or where the arbitrator has publicly taken a position on a matter at issue. It also reaches relationships between the arbitrators on the same tribunal, such as where two arbitrators are members of the same chambers or law firm. Because the Schedule is intended as a guide to disclosure, the prudent course for any prospective arbitrator is to err generously on the side of disclosure: a circumstance disclosed and accepted by the parties cannot later be weaponised, whereas a non-disclosed circumstance, even an innocuous one, can fatally undermine the resulting award. The duty operates throughout the reference, so an arbitrator who acquires a disqualifying relationship mid-proceeding — say, because his firm takes on a new client connected to a party — must disclose it the moment it arises.
The Seventh Schedule: Categories of Per Se Ineligibility
The Seventh Schedule is the sharper instrument. Where a relationship falls within any of its categories, Section 12(5) renders the person ineligible to be appointed — there is no inquiry into whether a reasonable person would in fact doubt his impartiality; the ineligibility is conclusive and operates de jure. The Seventh Schedule borrows the most serious categories from the IBA's "non-waivable Red List", including: the arbitrator being an employee, consultant, advisor or having a current business relationship with a party (Entry 1); the arbitrator's law firm having a significant commercial relationship with a party; the arbitrator regularly advising a party and deriving significant financial income therefrom; the arbitrator having a significant financial interest in the outcome; and — of decisive practical importance — the arbitrator being a manager, director or part of the management, or having a similar controlling influence, in one of the parties (the entry that decided TRF).
The non-obstante clause in Section 12(5) is the engine of this regime. It overrides any contractual stipulation — a clause naming a managing director or a company official as the named arbitrator is simply wiped out the moment the Seventh Schedule is engaged. The only escape is the proviso to Section 12(5): the parties may, by an express agreement in writing entered into after the disputes have arisen, waive the applicability of the subsection. An implied waiver, or a waiver embedded in the original contract before any dispute, will not do. This stringent waiver requirement marks a sharp departure from the general doctrine of waiver of the right to object under Section 4, where conduct may suffice.
The rationale for the heightened waiver standard is structural. A pre-dispute waiver embedded in a standard-form contract — typically drafted by the stronger party — would simply reproduce the very imbalance the Seventh Schedule was enacted to correct; the weaker party would "consent" to a biased tribunal at a stage when it has no real bargaining power and no concrete dispute in contemplation. By insisting that the waiver be express, in writing, and made only after the dispute has crystallised, the proviso ensures that any agreement to retain an otherwise-ineligible arbitrator is a genuine, informed and voluntary choice. It is worth emphasising that the Seventh Schedule is a closed, exhaustive list of disqualifying categories, unlike the open-textured Fifth Schedule: a person either falls within one of its entries or he does not, and the inquiry admits of no balancing or assessment of the degree of doubt. That binary, mechanical quality is precisely what gives the provision its force.
Fifth Versus Seventh: The Doctrinal Line Drawn in HRD Corporation
The single most authoritative exposition of how the two schedules differ is HRD Corporation (Marcus Oil and Chemical Division) v. GAIL (India) Ltd., (2018) 12 SCC 471. GAIL had appointed two retired Supreme Court judges as arbitrators; HRD challenged both, invoking various entries of the Fifth and Seventh Schedules — in particular, the fact that the arbitrators had previously rendered awards or opinions in related disputes between the same parties. The Supreme Court (Nariman, J.) drew the governing distinction with precision: the grounds in the Seventh Schedule are grounds which make a person ineligible to be appointed as an arbitrator, whereas the grounds in the Fifth Schedule are grounds which may give rise to justifiable doubts as to independence or impartiality but do not, by themselves, render a person ineligible.
The Court held that where a challenge is founded on the Seventh Schedule, the arbitrator's mandate terminates automatically under Section 14(1)(a) (de jure inability), and the matter may go directly to court. But where the challenge rests only on the Fifth Schedule, the prescribed route is the challenge procedure under Section 13 before the tribunal itself, with recourse to court deferred until after the award under Section 34. The Court further confirmed that both schedules are lifted from, and must be read in consonance with, the IBA Guidelines on Conflicts of Interest in International Arbitration, 2014. On the facts, the Court declined to remove the arbitrators, holding that a retired judge who had previously decided other disputes between the parties did not fall within the prohibition, since the relevant entries are concerned with prior involvement in the same dispute or repeated appointments of a particular character, not with prior unrelated adjudications.
Voestalpine: Neutrality, PSU Panels and the Spirit of the Schedules
One of the earliest and most influential decisions interpreting the amended Section 12 in the context of government and public-sector arbitration is Voestalpine Schienen GmbH v. Delhi Metro Rail Corporation Ltd., (2017) 4 SCC 665. DMRC's contract required the foreign claimant to nominate its arbitrator from a panel maintained by DMRC, drawn largely from retired railway and government officers. Voestalpine argued that such serving or retired employees of a party were ineligible under the Seventh Schedule.
The Supreme Court clarified that a retired government employee, merely by virtue of past employment with an entity unconnected to the present dispute, is not automatically disqualified — Entry 1 of the Seventh Schedule bites only where the person is presently an employee, consultant or advisor of, or has a current business relationship with, the party in the arbitration. However, the Court was acutely alive to the perception of bias inherent in one party curating the entire panel. It directed DMRC to broaden its panel to make it genuinely "broad-based", including engineers, judicial officers and professionals from diverse backgrounds, and emphasised that the choice offered to the counter-party must be wide enough to dispel any reasonable apprehension. Voestalpine thus read the schedules purposively: the letter of the Seventh Schedule may not be triggered, but the underlying policy of neutrality — the very value the schedules protect — constrains how appointment mechanisms may be structured.
TRF Limited: An Ineligible Person Cannot Nominate
The watershed application of the Seventh Schedule came in TRF Ltd. v. Energo Engineering Projects Ltd., (2017) 8 SCC 377. The arbitration clause provided that disputes would be referred to the sole arbitration of the Managing Director of Energo or his nominee. After the 2015 Amendment, the Managing Director plainly fell within the Seventh Schedule entry covering a person who is a manager, director or part of the management of a party, and was therefore ineligible under Section 12(5). The question was whether, though himself disqualified, the Managing Director could nonetheless validly nominate a third party as arbitrator.
A three-judge Bench answered emphatically in the negative. The Court reasoned that once the Managing Director became ineligible by operation of law, he could not perform any function flowing from that office in the arbitration — and the power to nominate was precisely such a function. Invoking the maxim qui facit per alium facit per se (he who acts through another acts himself), the Court held that what a person cannot do directly, he cannot do through a nominee. The nomination by an ineligible authority was therefore void. TRF established the foundational principle that ineligibility under the Seventh Schedule is not confined to the act of sitting as arbitrator but extends to the connected power of appointment.
Perkins Eastman: Extending TRF to Unilateral Appointments
TRF left open a doctrinal gap. Where the ineligible person did not name himself but only retained the sole power to appoint someone else, did the disqualification still bite? The Supreme Court closed that gap in Perkins Eastman Architects DPC v. HSCC (India) Ltd., (2020) 20 SCC 760 (decided 26 November 2019). Here the clause empowered HSCC's Chief Managing Director — himself ineligible — not to act as arbitrator but to appoint the sole arbitrator. HSCC argued that TRF was distinguishable because the CMD was not named as arbitrator at all.
The Court rejected the distinction. It held that the controlling consideration is whether the appointing authority has an interest in the outcome of the dispute; if so, the apprehension of bias attaches to any arbitrator that authority unilaterally appoints, exactly as if it had appointed itself. An interested party's exclusive power to constitute the tribunal is therefore impermissible. The Court reasoned that the same fear of partiality that disqualifies a person from being an arbitrator must equally disqualify him from being the sole appointing authority. Perkins thus generalised TRF from the narrow facts of a self-or-nominee clause to all clauses vesting unilateral appointment power in a single interested party, and is the cornerstone of the modern Indian jurisprudence against unilateral appointments.
Bharat Broadband: De Jure Ineligibility and the Written-Waiver Bar
The consequences of a Seventh Schedule infraction were spelt out in Bharat Broadband Network Ltd. v. United Telecoms Ltd., (2019) 5 SCC 755. BBNL's clause empowered its Chairman-cum-Managing Director to appoint the sole arbitrator; relying on the clause, he appointed an arbitrator. After TRF was decided, BBNL itself sought to terminate the very arbitrator it had appointed, contending that the appointment was void because the appointing authority was ineligible.
The Supreme Court agreed and laid down several propositions of lasting importance. First, Section 12(5) creates a de jure ineligibility: the moment a person falls within the Seventh Schedule, he becomes incapable in law of acting, and any appointment he makes is void. Second, where such ineligibility exists, the arbitrator's mandate terminates under Section 14(1)(a), and a party may approach the court to declare the termination. Third, and critically, the ineligibility can be removed only by an express agreement in writing made after the disputes have arisen — the proviso to Section 12(5). The Court held that participating in proceedings, or failing to object, does not amount to such a waiver; conduct can never substitute for the express written agreement the proviso demands. A party is therefore not estopped from raising Seventh Schedule ineligibility even at a late stage. Bharat Broadband cements that Section 12(5) ineligibility is a matter of public policy that strikes at the root of the appointment.
Jaipur Zila Dugdh: Office-Holders and the Reach of the Seventh Schedule
That the Seventh Schedule looks to substance, not nomenclature, was reaffirmed in Jaipur Zila Dugdh Utpadak Sahkari Sangh Ltd. v. M/s Ajay Sales and Suppliers, (2021). A distributorship agreement named the Chairman of the cooperative society — an elected director of the society — as the sole arbitrator. The society argued that "Chairman" was not expressly listed in the Seventh Schedule.
The Supreme Court held the Chairman ineligible. Although the precise designation "Chairman" does not appear in the Schedule, an elected member or director who is part of the management of one of the parties squarely falls within the relevant Seventh Schedule entries (the entries dealing with a manager, director or person controlling a party). What matters is the functional relationship with the party, not the label of the office. The Court reiterated that Section 12(5) read with the Seventh Schedule was inserted precisely to secure the impartiality and independence of arbitrators, and that an interested office-holder cannot be permitted to adjudicate a dispute to which his own organisation is a party. The decision is a useful corrective against attempts to evade the Schedule through creative drafting of designations.
The CORE Constitution Bench: Equality and the End of Curated PSU Panels
The jurisprudence culminated in the Constitution Bench decision in Central Organisation for Railway Electrification v. M/s ECI-SPIC-SMO-MCML (JV), decided on 8 November 2024. A five-judge Bench was constituted to resolve the lingering tension between party autonomy and the principle of equality in the constitution of arbitral tribunals, particularly in public-private and PSU contracts where one party had historically controlled the panel from which the other was forced to choose.
The majority held that a clause permitting one party unilaterally to appoint a sole arbitrator, or to curate a narrow panel and compel the counter-party to select from it, is impermissible. The principle of equal treatment of parties — a value underpinning the appointment process — applies at the stage of constituting the tribunal, not merely during proceedings, and a clause that allows one side to control the composition of the very forum that will adjudicate the dispute breaches that equality at its root. The Court further held that such unilateral appointment clauses in public-private contracts violate the guarantee of equality before the law under Article 14 of the Constitution. In reaching this conclusion the Bench harmonised the strand of authority flowing from TRF, Perkins and Bharat Broadband with the principle of party autonomy, holding that autonomy, however cardinal, must yield to the non-derogable requirement of an impartial and independent tribunal. CORE thus elevates the policy embodied in Section 12(5) and the Seventh Schedule to a constitutional plane, confirming that the schedules are not a technical checklist but the statutory expression of a deeper commitment to a neutral, balanced tribunal. Together with the rules governing the power of the court to refer parties to arbitration, these decisions frame the gatekeeping of arbitral neutrality in India.
Disclosure, Challenge Procedure and the Interplay with Sections 13 and 14
The schedules do not operate in a vacuum; they are activated through the procedural machinery of Sections 12 to 14. Under Section 12(1), an arbitrator must make his disclosure in the form specified in the Sixth Schedule, addressing the Fifth Schedule grounds. A failure to disclose a Fifth Schedule circumstance is itself a serious matter, capable of grounding a challenge and, where the non-disclosed circumstance reveals a Seventh Schedule relationship, of voiding the appointment.
Where a party wishes to challenge an arbitrator on Fifth Schedule grounds, Section 13 prescribes that it must, within fifteen days of becoming aware of the constitution of the tribunal or of the circumstance, send a written statement of reasons to the tribunal; unless the arbitrator withdraws or the other party agrees, the tribunal itself decides the challenge, and an unsuccessful challenger must wait until the award to seek relief under Section 34. By contrast, a Seventh Schedule ground need not run this gauntlet: as HRD Corporation and Bharat Broadband establish, ineligibility under Section 12(5) is a de jure inability under Section 14(1)(a), and the aggrieved party may go straight to court for a declaration that the mandate has terminated and for the appointment of a substitute under the rules applicable to the original appointment. Section 12(4) adds a further limitation: a party may challenge an arbitrator it appointed (or in whose appointment it participated) only for reasons it became aware of after the appointment — though this restriction yields to the overriding, non-waivable character of Section 12(5).
Practical Significance and Drafting Takeaways
For practitioners and aspirants, the two-schedule framework yields a set of concrete propositions. First, every named-officer arbitration clause — "the Managing Director shall be the sole arbitrator", "disputes shall be referred to the Chairman" — is now presumptively dead, struck down by Section 12(5) read with the Seventh Schedule (TRF, Jaipur Zila Dugdh). Second, even a clause that merely vests unilateral appointment power in an interested party is invalid (Perkins), and in the PSU context such clauses additionally offend Article 14 (CORE). Third, the only cure for a Seventh Schedule defect is an express written waiver after the dispute arises; silence, participation or a pre-dispute contractual term will not save the appointment (Bharat Broadband).
Fourth, the Fifth Schedule operates on a different register: it does not void appointments but mandates disclosure and supplies the yardstick for justifiable-doubt challenges decided in the first instance by the tribunal. Fifth, the schedules are to be read in harmony with the IBA Guidelines from which they derive, so that international best practice informs their interpretation (HRD Corporation). The safest drafting course, post-2015, is to provide for appointment by a neutral institution or by mutual agreement, and to ensure that any panel offered is genuinely broad-based (Voestalpine). For a fuller picture of how arbitration agreements are construed and the formal requirements they must meet, see the note on the form and validity of the arbitration agreement.
Frequently asked questions
What is the core difference between the Fifth Schedule and the Seventh Schedule?
The Fifth Schedule lists grounds that give rise to justifiable doubts about an arbitrator's independence or impartiality — they guide disclosure under Section 12(1) and may found a challenge under Section 12(3), but do not automatically disqualify. The Seventh Schedule lists relationships that render a person ineligible to be appointed under Section 12(5), operating automatically by force of law. The Supreme Court drew this line authoritatively in HRD Corporation v. GAIL (India) Ltd., (2018) 12 SCC 471.
Can a person who is ineligible under the Seventh Schedule still appoint or nominate the arbitrator?
No. In TRF Ltd. v. Energo Engineering Projects Ltd., (2017) 8 SCC 377, the Supreme Court held that a Managing Director ineligible under the Seventh Schedule could not even nominate an arbitrator, applying the maxim that what one cannot do directly one cannot do through another. Perkins Eastman Architects DPC v. HSCC (India) Ltd., (2020) 20 SCC 760, extended this to any clause giving an interested party the sole, unilateral power to appoint.
How can the ineligibility under Section 12(5) be waived?
Only by an express agreement in writing entered into after the disputes have arisen, as the proviso to Section 12(5) requires. Bharat Broadband Network Ltd. v. United Telecoms Ltd., (2019) 5 SCC 755, held that mere participation in the proceedings or failure to object does not amount to a waiver; conduct cannot substitute for the express written agreement, and a party is not estopped from raising the ineligibility later.
Is a retired government or PSU employee automatically barred from acting as arbitrator?
Not automatically. In Voestalpine Schienen GmbH v. Delhi Metro Rail Corporation Ltd., (2017) 4 SCC 665, the Court held that Entry 1 of the Seventh Schedule bites only where the person is presently an employee, consultant or advisor of, or has a current business relationship with, a party to the dispute. Past unrelated employment does not disqualify, but the Court still required panels to be genuinely broad-based to avoid any perception of bias.
What is the source of the Fifth and Seventh Schedules?
Both schedules were introduced by the Arbitration and Conciliation (Amendment) Act, 2015, on the recommendation of the 246th Law Commission Report, and are drawn directly from the IBA Guidelines on Conflicts of Interest in International Arbitration, 2014. The Fifth Schedule contains thirty-four grounds. The Supreme Court in HRD Corporation v. GAIL (India) Ltd., (2018) 12 SCC 471, held the schedules must be read in consonance with the IBA Guidelines.
Are unilateral arbitrator-appointment clauses in PSU contracts now valid?
No. The Constitution Bench in Central Organisation for Railway Electrification v. M/s ECI-SPIC-SMO-MCML (JV) (8 November 2024) held that unilateral appointment of a sole arbitrator, or curating a panel from which the counter-party must choose, is impermissible, and that such clauses in public-private contracts violate the right to equality under Article 14 of the Constitution. The principle of equal treatment applies at the stage of constituting the tribunal.