Comparing ICC Arbitration Rules 2026 and HKIAC 2024 Rules: Removal of Terms of Reference, CMC Cut-Offs, and Award Scrutiny

Comparing ICC Arbitration Rules 2026 and HKIAC 2024 Rules: Removal of Terms of Reference, CMC Cut-Offs, and Award Scrutiny

International arbitration practice across the premier hubs of Asia has entered a decisive new phase. Corporate general counsel, cross-border commercial litigators, and institutional arbitrators operating in Hong Kong, Singapore, and Mainland China face a transformed landscape.

The entry into force of the 2026 ICC Arbitration Rules (effective June 1, 2026) alongside the established 2024 HKIAC Administered Arbitration Rules (effective June 1, 2024) presents commercial parties with a strategic choice.

For decades, the International Chamber of Commerce (ICC) and the Hong Kong International Arbitration Centre (HKIAC) represented contrasting procedural philosophies. The ICC was renowned for its institutional oversight, structured milestones, and mandatory Terms of Reference, while HKIAC championed speed, maximum tribunal autonomy, and procedural flexibility.

The 2026 ICC revision alters this equation. By eliminating the mandatory Terms of Reference, tightening Case Management Conference (CMC) deadlines, and imposing strict cut-offs for new claims, the ICC has aligned its front-end procedures with the agile framework that helped HKIAC rise to prominence.

However, critical differences remain regarding institutional award scrutiny, the timeline for late claims, and procedural finality. Choosing between these institutional rules dictates front-loaded case strategies, pleading preparation, and cost exposure in high-value cross-border disputes.

Section 1: The Death of Mandatory Terms of Reference

The most notable structural reform in the 2026 ICC Arbitration Rules is the formal abolition of mandatory Terms of Reference (ToR).

1. The Historic Evolution of ICC Terms of Reference

For nearly a century, the Terms of Reference stood as the defining hallmark of ICC arbitration. Originating before the 1958 New York Convention, when municipal courts frequently questioned arbitral authority, the ToR served as a formal procedural contract signed by the parties and the tribunal. It established the parties' verified identities, an agreed summary of claims and counterclaims, the relief sought, and a definitive list of issues to be determined.

While intended to establish consent and narrow controversies, modern cross-border litigators viewed the mandatory ToR as a source of procedural friction. Parties frequently spent months negotiating minor phrasing in the summary of issues. In complex multi-party matters, recalcitrant respondents weaponized the drafting process to delay tribunal constitution and stall the issuance of Procedural Order No. 1.

Building upon the successful track record of its Expedited Procedure Provisions (where ToRs were eliminated in 2017 with fewer than 2.5 percent of tribunals opting to draw them up), the ICC has dispensed with mandatory ToRs entirely in ordinary proceedings. Under Article 25 of the 2026 Rules, tribunals retain discretionary authority to draw up Terms of Reference only if deemed appropriate for a specific dispute.

2. The HKIAC Lean, ToR-Free Tradition

In contrast, the HKIAC Administered Arbitration Rules have never required Terms of Reference. Under the 2024 HKIAC Rules (as in prior iterations), the dispute is defined directly through the parties' primary pleadings: the Notice of Arbitration (Article 4), the Answer to the Notice of Arbitration (Article 5), and the subsequent Statement of Claim and Statement of Defence (Articles 17 and 18).

HKIAC's approach reflects an agile common law model. Rather than dedicating the initial thirty to sixty days to drafting an institutional summary document, the HKIAC tribunal assumes control of the transmitted case file immediately upon constitution.

By abandoning mandatory ToRs, the 2026 ICC Rules acknowledge that modern international arbitration requires swift movement from tribunal constitution straight into substantive case management.

Section 2: Case Management Conferences (CMCs) and the Late Claim Cut-Off

With the removal of mandatory Terms of Reference, both institutions now utilize the Case Management Conference (CMC) as the primary anchor for setting procedural timetables and establishing strict claim boundaries. However, their operational mechanics diverge significantly.

1. ICC Articles 24 and 25: The 30-Day Mandatory CMC and Late Claim Barrier

Under the 2026 ICC Rules, the initial Case Management Conference is the central procedural milestone:

• The 30-Day Mandate (Article 24): The arbitral tribunal is statutorily required to convene an initial CMC within 30 days of file transmission from the Secretariat to establish the procedural timetable.
• The Strict Cut-Off for New Claims (Article 25): Historically under the ICC framework, the execution of the Terms of Reference served as the dividing line after which no party could introduce new claims or counterclaims without tribunal authorization. Under Article 25 of the 2026 Rules, this procedural gate is transferred directly to the initial CMC.
• The Threshold for Leave: Following the conclusion of the initial CMC, no new claims, counterclaims, or set-off defenses may be advanced unless authorized by the arbitral tribunal. In exercising its discretion to grant leave, the tribunal must consider the nature of the proposed new claims, the stage of the arbitration, cost consequences, and potential prejudice to the opposing party.

This reform eliminates dilatory amendments and requires corporate counsel to conduct comprehensive claim audits prior to file transmission.

2. HKIAC 2024 Case Management Architecture and Claim Amendments

HKIAC addresses case framing and amendments through a dual-mechanism approach:

• Prompt Procedural Timetable (Article 13): As soon as practicable after constitution, the arbitral tribunal convenes a procedural conference or directs the parties to agree on a timetable. HKIAC emphasizes digital integration, cybersecurity protocols, and environmental impact mitigation under Article 13 of the 2024 Rules.
• Amendments to Claims and Defenses (Article 18): Under Article 18.1 of the 2024 HKIAC Rules, a party may amend or supplement its claim or defense during the course of the arbitral proceedings, unless the arbitral tribunal considers it inappropriate having regard to the delay in making it or prejudice to other parties.
• Jurisdictional Boundary: Article 18.1 contains an explicit limitation: a claim or defense may not be amended in such a manner that the amended claim falls outside the jurisdiction of the arbitral tribunal.
• Fee Adjustments (Article 18.2): HKIAC retains express authority under Article 18.2 to adjust its administrative fees and the tribunal's fees if a late amendment increases the disputed quantum.

While HKIAC relies on the tribunal's broad case-management discretion to disallow late claims, the 2026 ICC Rules erect a structural default bar at the 30-day mark.

Section 3: Award Scrutiny vs. Institutional Oversight

The most enduring philosophical and practical distinction between the ICC and HKIAC lies in the final review and scrutiny of arbitral awards before they are rendered to commercial parties.           

1. Mandatory Scrutiny by the ICC International Court of Arbitration

Under Article 34 of the ICC Rules, no award (whether partial, interim, or final) may be signed or notified to the parties by the tribunal until it has been formally scrutinized and approved by the ICC International Court of Arbitration:

• Scope of Scrutiny: The ICC Court examines the draft award to identify procedural deficiencies, verify calculations, ensure compliance with the formal legal requirements of the arbitral seat, and protect against enforceability defects under the New York Convention.
• Points of Substance: While respecting the arbitral tribunal's ultimate decision-making independence on the merits, the ICC Court is expressly empowered to draw the tribunal's attention to points of substance, conflicting factual findings, or unaddressed claims.
• The Strategic Benefit: ICC scrutiny serves as a valuable quality-assurance filter. For awards requiring multi-jurisdictional enforcement across emerging markets or state entities, an ICC Court-scrutinized award carries an established reputation for procedural integrity before municipal enforcement judges.
• The Cost in Time: The scrutiny process can require between three and six weeks from the tribunal's submission of the draft award, adding an institutional layer to post-hearing proceedings.

2. The HKIAC Administrative Model: Rapid Procedural Delivery

HKIAC operates under a different institutional philosophy, placing trust in the competence of the tribunal and prioritizing rapid delivery:

• No Mandatory Court Scrutiny: Under the 2024 HKIAC Rules, draft awards are not subjected to mandatory line-by-line review by an institutional court. The arbitral tribunal signs the award, and the HKIAC Secretariat conducts basic administrative checks (such as verifying payment of deposits) before dispatching certified copies directly to the parties.
• The Three-Month Award Mandate (Article 31.2): Under Article 31.2 of the 2024 HKIAC Rules, the arbitral tribunal must deliver the final award to the parties within three months from the date the proceedings are declared closed.
• The Strategic Advantage: For fast-moving commercial disputes involving private equity transactions, corporate joint ventures, or volatile commodity contracts where immediate asset preservation and rapid commercial finality are paramount, HKIAC eliminates administrative delays.

Section 4: Deep-Dive Structural Matrix: ICC 2026 vs. HKIAC 2024

This scannable structural matrix contrasts the core operational rules governing both institutions:

1. Early Pleadings and Framing Anchor

• ICC 2026 Framework: Mandatory Terms of Reference abolished. The initial Case Management Conference (convened within 30 days of file transmission) serves as the primary framing anchor under Article 24.

• HKIAC 2024 Framework: No Terms of Reference. Case framing is anchored directly in the Notice of Arbitration (Art. 4) and Answer (Art. 5), followed by full Statements of Claim and Defence (Arts. 17 and 18).

2. Late Claim and Counterclaim Cut-Off

• ICC 2026 Framework: Hard default cut-off under Article 25. No new claims or defenses may be introduced after the initial CMC without express tribunal authorization based on delay, prejudice, and cost factors.
• HKIAC 2024 Framework: Amendments permitted under Article 18.1 unless the tribunal considers it inappropriate due to delay or prejudice, subject to the strict requirement that amendments remain within arbitral jurisdiction.

3. Case Management Conference Deadlines

• ICC 2026 Framework: Mandatory requirement to hold the initial CMC within 30 days from the date of file transmission to the arbitral tribunal.
• HKIAC 2024 Framework: Tribunal directed to convene a procedural conference as soon as practicable, establishing a comprehensive procedural timetable under Article 13.

4. Award Scrutiny and Quality Control Mechanism

• ICC 2026 Framework: Mandatory institutional review by the ICC Court of Arbitration under Article 34 prior to notification. Scrutinizes form, enforceability, and points of substance.

• HKIAC 2024 Framework: Administrative review by the Secretariat without substantive court scrutiny. Emphasizes tribunal autonomy and swift notification.

5. Final Award Delivery Window

• ICC 2026 Framework: Six months from the approval of the procedural timetable, subject to extension by the President of the ICC Court based on the case complexity and reasoned tribunal request.
• HKIAC 2024 Framework: Strict deadline of three months from the closure of proceedings under Article 31.2.

6. Early Dismissal of Frivolous Claims

• ICC 2026 Framework: Express early determination procedure introduced under Article 30, authorizing tribunals to summarily dismiss claims or defenses that are manifestly without legal merit or outside jurisdiction.
• HKIAC 2024 Framework: Established Early Determination Procedure (EDP) under Article 43, empowering tribunals to dismiss unmeritorious claims or defenses within compressed statutory timelines.

Section 5: Strategic Advice for Corporate General Counsel

When drafting dispute resolution clauses for cross-border investments, mergers and acquisitions, and commercial projects across the Asia-Pacific region, corporate legal departments should apply the following guidelines:

• Evaluate the Balance Between Scrutiny and Speed: If your transaction involves sovereign states, state-owned enterprises, or counterparties whose assets are located in jurisdictions known for resisting enforcement, the institutional scrutiny of the ICC Court under Article 34 offers an added safeguard against procedural challenges. If the priority is commercial speed and minimizing administrative costs, HKIAC's streamlined three-month award window under Article 31.2 provides faster resolution.
• Audit Claims Prior to the Initial CMC: In ICC arbitrations under the 2026 Rules, counsel can no longer rely on the Terms of Reference negotiation period to gather evidence or discover secondary claims. All viable causes of action, alternative relief claims, and counterclaims must be fully researched and articulated within thirty days of file transmission to survive the Article 25 cut-off.
• Account for Cross-Border Enforcement in Mainland China: For corporate entities whose counterparties hold substantial operating assets in Mainland China, an HKIAC-administered arbitration seated in Hong Kong retains a decisive operational advantage: direct statutory access to Intermediate People's Courts for property and evidence preservation under the Mainland-Hong Kong Interim Measures Arrangement.
• Utilize Early Determination Procedures for Non-Meritorious Claims: Both institutional rulebooks now contain express mechanisms to dismiss frivolous defenses (ICC Article 30 and HKIAC Article 43). Corporate litigators should actively leverage these summary procedures during initial case management to dispose of bad-faith stalling tactics without incurring the cost of a full evidentiary trial.

The elimination of mandatory Terms of Reference in the 2026 ICC Rules brings two of the world's premier arbitral institutions into closer procedural alignment. By understanding how their remaining differences regarding award scrutiny and late-claim bars operate, corporate counsel can choose the optimal institutional framework for cross-border dispute resolution in Asia.

 

Disclaimer: This article is for informational purposes only and does not constitute formal legal or professional international arbitration advice.