How to Challenge or Remove an Arbitrator in Malaysia (2026): Grounds, Procedure & Court Intervention

Last updated: 18 August 2026

To challenge arbitrator Malaysia proceedings effectively, a party must understand three distinct routes, the institutional procedure administered by the Asian International Arbitration Centre (AIAC), a direct application to the tribunal itself, and an application to the High Court under the statutory regime. With the Arbitration (Amendment) Act 2024 in force from 1 January 2026, the grounds, disclosure duties and court supervisory powers governing arbitrator challenges have been refined, sharpening the procedural discipline required of applicants. This guide sets out, in the manner of a practice note, how the process works: who may act, on what grounds, within what deadlines, at what likely cost, and with what likely outcome.

It is written for parties, in-house counsel, external counsel, arbitrators and tribunal secretaries who need a defensible, step-by-step method rather than high-level commentary.

Introduction & Key Takeaways

An application to challenge arbitrator Malaysia matters is not a tactical convenience; it is a formal, time-sensitive process where delay can extinguish the right entirely. The remedies available differ sharply depending on whether the dispute is administered by an institution, is proceeding ad hoc, or has already reached the award stage. The single most important discipline is speed: the moment a party becomes aware of grounds, the clock starts, and continued participation without objection may be construed as waiver.

Quick checklist

• When to act. Immediately upon discovering an undisclosed relationship, apparent bias, incapacity or serious procedural default.
• Quick wins. Serve a written notice of objection at once; secure documentary evidence (appointment letters, CVs, disclosures, email trails) before it can be lost.
• When to go to court. Where the institution or tribunal declines to act, where coercive relief is required, or where urgent interim protection is needed pending determination.

When to call counsel

Engage specialist arbitration counsel before serving any notice. A poorly framed objection can harden the tribunal’s position, waive rights, or expose the applicant to adverse costs. Counsel will assess proportionality, the strength of the grounds, and whether replacement or continuation better serves the client’s commercial interest.

1. Overview: The Three Routes to Challenge Arbitrator Malaysia Proceedings

Malaysian practice recognises a layered structure. First, where parties have agreed to institutional administration, most commonly the AIAC, the institutional rules provide a challenge procedure with its own timetable and decision-maker. Second, the tribunal itself may be asked to determine a challenge or to permit an arbitrator to recuse. Third, the High Court exercises statutory supervisory jurisdiction under the Arbitration Act 2005, with power to decide on the termination of an arbitrator’s mandate and to grant coercive or interim relief that neither an institution nor a tribunal can command.

Institutional vs ad hoc

In institutional arbitration the agreed rules govern the first-instance challenge and are usually to be exhausted before any court application. In ad hoc arbitration there is no administering body, so the tribunal and the High Court carry the full procedural weight. Identifying which regime applies is the first analytical step in any decision to challenge arbitrator Malaysia disputes.

Role of disclosure

Disclosure sits at the centre of the modern regime. An arbitrator’s continuing duty to disclose circumstances that may give rise to justifiable doubts about impartiality or independence is the engine of most successful challenges. The 2024 amendments reinforce that duty, and late or non-disclosure now provides one of the cleaner evidential foundations for a challenge.

2. Eligibility: Who Can Challenge an Arbitrator

Standing to challenge is, in principle, confined to the parties to the arbitration agreement. Under the Arbitration Act 2005, a party may challenge an arbitrator whom it appointed, or in whose appointment it participated, only for reasons of which it becomes aware after the appointment, a deliberate restraint that discourages appointing a candidate and then attacking that same choice on facts already known.

Co-arbitrators and the tribunal do not “challenge” in the party sense; however, a tribunal member who becomes aware of a disqualifying circumstance is expected to disclose it and may withdraw. A tribunal secretary has no standing to bring a challenge but may be a relevant witness where the allegation concerns the improper delegation of decision-making functions.

Two practical limits recur. First, third-party funders have no independent standing; a funded party must itself bring the application, though the funding relationship may itself be a disclosable matter. Second, the parties may agree on a procedure for challenging an arbitrator, and contractual constraints, including any express waiver of certain objections, will be scrutinised. A party that presses on with the proceedings after learning of grounds, without protest, risks being held to have waived its right to challenge arbitrator Malaysia conduct on those grounds.

3. Grounds to Challenge or Remove an Arbitrator

The grounds fall into statutory and behavioural categories. An applicant must plead them precisely and support each with documentary proof; generalised dissatisfaction with the arbitrator’s rulings is not a ground and will fail.

Statutory grounds

The core statutory grounds, drawn from the Arbitration Act 2005 as amended by the Arbitration (Amendment) Act 2024, are that circumstances exist giving rise to justifiable doubts as to the arbitrator’s impartiality or independence, or that the arbitrator does not possess the qualifications agreed by the parties. Termination-of-mandate grounds extend to an arbitrator who becomes de jure or de facto unable to perform their functions, or who fails to act without undue delay. Where an arbitrator’s mandate has terminated on any of these bases, a substitute must be appointed under the same rules that applied to the original appointment.

Disclosure duties & late disclosure

An arbitrator is under a continuing obligation, from the time of approach in connection with a possible appointment and throughout the proceedings, to disclose any circumstance likely to give rise to justifiable doubts about impartiality or independence. Late disclosure, a relationship revealed mid-hearing, can be doubly damaging: it may establish both the substantive concern and a breach of the disclosure duty. In practice, undisclosed material relationships (financial interest, repeat appointments by the same party or counsel, prior advisory engagements) form a strong evidential base to challenge arbitrator Malaysia appointments, because the tribunal or court is not asked to infer bias from conduct but to weigh an objective, documented fact.

Behavioural and competence grounds

These include actual bias, a reasonable apprehension of bias, misconduct in the conduct of the reference, incapacity, and persistent failure to progress the arbitration. The distinction the tribunal and court draw is between conduct that can be cured, for example, by a supplementary disclosure and the parties’ informed consent to continue, and conduct that goes to the root of the arbitrator’s ability to act, which may justify termination of the mandate. Competence or incapacity grounds are among the hardest to prove and should be advanced only with cogent evidence, sometimes including an expert report.

Who usually succeeds? Useful for any party weighing whether to challenge arbitrator Malaysia proceedings: challenges tend to succeed where there is clear, documented bias, an undisclosed material interest, or demonstrable procedural unfairness. They tend to fail, and may expose the applicant to costs, where the real complaint is displeasure with interlocutory rulings or an adverse direction on evidence. Frame the application around objective facts, not resentment.

4. Step-by-Step Procedure to Challenge Arbitrator Malaysia Disputes

The following procedure covers the institutional, tribunal and court routes in sequence. In institutional cases the agreed rules should ordinarily be exhausted before a court application; in ad hoc cases the tribunal and court routes apply directly.

1. Internal review and evidence collection. Assemble disclosures, appointment correspondence, CVs, the arbitration agreement, procedural orders and any communications evidencing the ground relied upon. Prepare a chronology showing when the ground was discovered.
2. Notify the other parties and the arbitrator. Serve a written statement of the reasons for the challenge, setting out the grounds and the relief sought. This preserves the record and defeats later waiver arguments.
3. File the institutional challenge. Where AIAC or another institution administers the reference, lodge the challenge under the applicable rules within the prescribed period. The institution liaises with the arbitrator, who may withdraw or respond.
4. Apply to the tribunal. Where the rules require or permit it, apply to the tribunal to determine the challenge. Unless the arbitrator withdraws or the other party agrees to the challenge, the tribunal (including the challenged arbitrator) may rule on it.
5. Seek interim relief from the High Court. Where urgent protection is needed, for example, to restrain a hearing pending determination, apply to the High Court, if necessary ex parte, for appropriate relief.
6. Refer the challenge to the High Court. Where the tribunal rejects the challenge, the challenging party may, within the statutory period, apply to the High Court to decide on the challenge; the court’s decision on that point is generally not subject to appeal.
7. Implement the order. On termination of the mandate, a substitute arbitrator is appointed by the rules that applied to the original appointment; the tribunal then rules on whether prior hearings must be repeated.

Pre-action checklist

Before serving any notice, confirm: the applicable rules and seat; the precise date the ground was discovered; whether the arbitrator was your own appointee (and whether the facts were known at appointment); and whether continued participation to date has generated a waiver risk. Secure evidence first, relationships and communications become harder to prove after an arbitrator is put on notice.

Institutional route (AIAC) step-by-step

File the notice of challenge with the AIAC within the period fixed by the applicable AIAC Arbitration Rules, stating the grounds and enclosing the supporting documents. The centre notifies the other party and the arbitrator; the arbitrator may withdraw voluntarily (which is not an admission) or contest. If the challenge is not resolved by agreement or withdrawal, the AIAC (through its Director, as provided in the applicable Rules) determines it. This route is generally faster and cost-controlled, but carries no coercive power over a recalcitrant party.

Tribunal route (application to the tribunal)

Under the Arbitration Act 2005, unless the arbitrator withdraws or the other party agrees, the arbitral tribunal decides on the challenge. The tribunal understands the case and can act quickly, but there is an obvious tension where the challenged arbitrator sits on the very tribunal asked to decide. A tribunal may invite submissions, or in a clear case accept the arbitrator’s withdrawal.

Court route (High Court application)

Where a challenge before the tribunal is unsuccessful, the challenging party may apply to the High Court under the Act to decide on the challenge, supported by affidavit and a draft order. The court exercises independent judgment and can grant coercive and interim relief in appropriate cases. It is slower and costlier.

Interaction with the tribunal timetable

A challenge does not automatically suspend the arbitration. While a court application to decide on a challenge is pending, the tribunal may (subject to the Act) continue the proceedings and even make an award, which is precisely why urgent interim relief is sometimes essential to prevent the applicant being overtaken by events.

Emergency relief

Where a hearing is imminent and irreparable prejudice is threatened, an urgent, potentially ex parte, application to the High Court preserves the position. The court will expect full and frank disclosure and may require an undertaking as to damages or security.

Step / Who / Duration timeline

Timings above are broad indications only and vary with urgency, complexity and the court list.

Required documents

Indicative costs

The following are broad indications only. Professional fees vary significantly with complexity, urgency and seniority; institutional and court fees are set by the relevant fee schedules current at the time. Always check the applicable AIAC fee schedule and the current court fees before budgeting.

Comparison of the Three Routes

5. Timeline & Deadlines

Time is the decisive variable. Under the Arbitration Act 2005, a party intending to challenge an arbitrator must send a written statement of the reasons for the challenge within the period prescribed by the Act once it becomes aware of the constitution of the tribunal or of the circumstances relied upon. Where the tribunal rejects the challenge, an application to the High Court to decide on it must be made within the statutory period. Continued participation without protest may trigger the doctrine of waiver: the right, once lost by delay, is not readily revived. Confirm the precise statutory periods in the current text of the Act before acting.

Urgency indicators

Move immediately where a hearing or award is imminent, where the ground is a late mid-proceeding disclosure, or where evidence of the disqualifying relationship may be lost. Because a pending challenge does not automatically stay the arbitration, an applicant who does not act quickly may find an award issued before the challenge is determined.

Examples (case scenarios)

• Late disclosure mid-hearing. An arbitrator reveals a prior engagement with a party’s affiliate during evidence. The correct response is an immediate written statement of reasons, a request that the hearing be adjourned, and, if refused, an urgent High Court application for interim relief pending determination.
• After the award. Where the ground emerges only after the award, mid-proceeding removal is no longer available. The remedy shifts to an application to set aside the award, which carries its own distinct statutory criteria and time limits, and which is a materially harder application to win.

6. Costs & Fees to Challenge Arbitrator Malaysia Applications

The cost of a challenge is driven principally by counsel time and the factual complexity of proving the ground. The estimates above are indicative only and will vary with claim value, urgency and seniority. Three disciplines help control the budget when a party decides to challenge arbitrator Malaysia proceedings.

• Use targeted interim applications. A precise, well-evidenced application for interim protection is cheaper and more persuasive than a sprawling attack on every ruling the arbitrator has made.
• Use the institutional procedure where it applies. The AIAC route is generally quicker and more cost-controlled than the court, and exhausting the agreed procedure first is usually expected.
• Apply proportionality. Weigh the cost of the challenge against the value at stake and the disruption of restarting hearings before a substitute.

Cost recovery is realistic only where the applicant succeeds and the tribunal or court orders costs. Full recovery is not guaranteed; parties should budget on the assumption that they may bear their own costs regardless of outcome.

7. What Changed in 2026: The Arbitration (Amendment) Act 2024

The Arbitration (Amendment) Act 2024 came into force on 1 January 2026 and refines the framework within which a party may challenge arbitrator Malaysia appointments. The amendments operate on the Arbitration Act 2005 rather than replacing it, so the familiar architecture, impartiality, independence, agreed qualifications, court supervision, remains in place.

Practical themes

• Disclosure duty. The continuing obligation to disclose circumstances raising justifiable doubts remains central, and early, disclosure-based objections continue to provide a strong evidential footing.
• Court supervisory role. The supervisory jurisdiction of the High Court over challenges and the termination of a mandate remains available where the tribunal or institution declines to act.
• Procedural discipline and timing. The statutory timing framework reinforces the premium on prompt action; verify the current periods in the amended text before framing any application.
• Alignment with international practice. Malaysia’s arbitration regime remains modelled on the UNCITRAL Model Law, supporting the country’s position as an arbitral seat.
• Interaction with award challenges. The distinction between mid-proceeding challenge and post-award setting-aside remains firm, so the practical lesson, challenge early or lose the cheaper remedy, is unchanged.

Applicants should read the amended provisions against the official consolidated text before framing any application, as the precise wording of grounds and time periods governs.

8. Common Pitfalls & Strategic Tips

• Do not delay notification. Serve the written statement of reasons the moment grounds are discovered; silence risks waiver.
• Preserve evidence early. Capture disclosures, CVs and communications before the arbitrator is on notice.
• Avoid tactical waiver. Do not continue to take substantive steps without expressly reserving your position.
• Engage the institution early. Use the AIAC procedure first where it applies; skipping the agreed procedure can undermine a later court application.
• Consider interim relief. Because a challenge does not stay the arbitration, protect the position where an award is imminent.
• Keep a clean record. Document every communication; a tidy chronology is often decisive on the question of promptness.
• Moderate the tone. An over-accusatory notice can harden the arbitrator’s stance and the tribunal’s; state facts, not invective.

Risk assessment

Weigh the disruption of removal, restarted hearings, lost time, cost, against the risk of proceeding before a compromised arbitrator whose award may later be vulnerable to setting-aside.

When to accept replacement vs continue

Where the ground is clear and the proceedings are early, replacement is usually the right call. Where the arbitration is well advanced and the ground marginal, continuation with an express reservation of rights may better serve the commercial interest.

Conclusion & Next Steps

A decision to challenge arbitrator Malaysia proceedings turns on three questions: is there a clear, documented ground; has the right been preserved by prompt objection; and which route, institutional, tribunal or High Court, delivers the relief needed within the available time. Under the current regime, disciplined, disclosure-based, early applications tend to succeed; delayed or opportunistic ones do not. Parties should map the applicable rules, secure evidence, and take specialist advice before serving any notice. This guide is general information and not a substitute for advice on the facts of your matter.

Sources

1. Attorney General’s Chambers of Malaysia (AGC)
2. Parliament of Malaysia (Acts and Bills)
3. Asian International Arbitration Centre (AIAC)
4. Judiciary of Malaysia
5. Malaysian Bar
6. UNCITRAL, Model Law resources