You are using an outdated browser and your browsing experience will not be optimal. Please update to the latest version of Microsoft Edge, Google Chrome or Mozilla Firefox. Install Microsoft Edge

October 24, 2025

Toward a Hybrid Future: Arbitration-Annexed Mediation at the Thai Arbitration Institute

Subscribe to Updates
The Legal Industry Reviews

The Thai Arbitration Institute (TAI), a division of Thailand’s Office of the Judiciary, has taken a step toward harmonizing the tools available for dispute resolution. On August 8, 2025, the institute formally launched the TAI Mediation Center (TAI-MC). Although the amendments to TAI’s Arbitration Rules that will govern the TAI-MC have not yet been finalized, the framework now under consideration suggests that TAI is positioning itself to become a more attractive venue for commercial dispute resolution.

In the regime contemplated under the current version of the amendments, TAI proceedings will adopt an “arbitration-annexed mediation” mechanism—commonly termed the “Med-Arb” model—while preserving the procedural safeguards indispensable to arbitral neutrality. Mediation will be entrusted to a separate, dedicated mediator appointed under the TAI-MC who is precluded from serving on the arbitral tribunal in the same matter. By clearly separating the functions of mediator and arbitrator, the institute eliminates any risk that confidential information disclosed during mediation could influence the adjudicatory outcome if the parties do not settle. Only when all parties subsequently make a request may that same mediator assume arbitral duties in the case.

The parties will retain substantial autonomy in selecting the mediator. They may either designate a mediator by mutual consent or invite the TAI-MC to appoint one from its authorized panel. TAI has announced its intention to curate that panel with particular emphasis on commercial expertise and cross-cultural negotiation skills, supplemented by ongoing professional training. Where the parties cannot agree on remuneration, the mediator’s fee will default to a tariff comparable to the TAI-MC’s cost schedule, which under the current version of the amendments will be approximately THB 45,000 for disputes in which the aggregate claims do not exceed THB 10 million, with incremental increases tied to higher claim values. This predictable cost matrix is aimed at enhancing transparency and budgeting certainty, two concerns frequently cited by counsel when selecting an ADR provider.

Any settlement reached in mediation may be rendered, at the parties’ election, into a consent award signed by the tribunal. Such an award is enforceable under Thailand’s Arbitration Act B.E. 2545 (2002) and, by extension, under the New York Convention, to which Thailand is a party. The prospect of combining the flexibility of mediation with the enforceability of an arbitral award is expected to resonate with foreign investors who have the objective of having such awards enforced in Thailand and elsewhere.

TAI’s initiative mirrors a broader international trend. By integrating a standalone mediation facility into its existing arbitration infrastructure, TAI is signaling that Thailand intends not merely to catch up but to compete for a share of the region’s burgeoning cross-border caseload.

Several practical issues remain open. The draft amendments must address the confidentiality interface between the mediation and arbitration phases, the precise triggers for initiating annexed mediation, and the mechanics for recommencing arbitral hearings if mediation fails. Nonetheless, discussions at the opening event of the TAI-MC suggest that users will enjoy flexibility in sequencing (for example, whether mediation should occur before any substantive hearing or during trial) and that tribunals will be encouraged to adopt pragmatic case management techniques to avoid delay. Once these measures are in place, parties drafting arbitration clauses that designate TAI as the administering institution will have the ability to secure both consensual and adjudicative outcomes within a single, integrated framework.

 

This article was first published in the October 2025 Thailand edition of The Legal Industry Reviews, an international platform that publishes news and applied law updates from industry-leading law firms worldwide. To browse the latest complete issue, please visit The Legal Industry Reviews website.

Related Professionals

Practices

Dispute Resolution and Litigation

Location

RELATED INSIGHTS​ 

August 6, 2026
Every month, VAT-registered businesses in Thailand calculate their output and input VAT and file a return to pay the net amount due or claim a refund. Yet a common and costly dispute arises when a business that has paid input VAT to its supplier—and done everything asked of it—later finds that input VAT rejected on the grounds that the tax invoice was issued by “a person not entitled to issue tax invoices.” In these cases, a buyer may have confirmed the supplier’s VAT registration on the Revenue Department’s website, paid through the banking system, received a complete tax invoice, and kept full payment and inventory records. Even so, if the Revenue Department later determines that the supplier did not genuinely make the sale or collected the VAT without remitting it, the department can disallow the input VAT and assess additional tax, surcharge, and penalty—often more than a year after the transaction. A new article from tax and dispute resolution specialists at Tilleke & Gibbins in Bangkok examines how the Revenue Department and the courts approach these disputes, including two recent Supreme Court (Tax Division) decisions confirming that the taxpayer bears the burden of proving a supplier genuinely sold and delivered the goods and received payment. It considers why the VAT registration system offers no legal safe harbor, why the evidentiary burden falls hardest on online and cross-border transactions where buyers and sellers never meet, and how the Revenue Department’s own digital infrastructure could detect non-remitting suppliers at the source rather than shifting the loss to good-faith buyers. The article also sets out practical guidance: how to build a comprehensive “know-your-supplier” file at the time of a transaction, the procedural steps and strict deadlines for challenging a VAT assessment, and why dispute readiness belongs alongside tax planning at the center
Read More
June 29, 2026
Thailand’s cabinet has approved the draft Act on Liability for Defective Goods, commonly called Thailand’s “Lemon Law.” The Draft Act is currently pending consideration by Parliament. The draft law aims to strengthen buyers’ position in pursuing cases against sellers. While the Civil and Commercial Code offers provisions governing liability for defective goods, it is difficult in practice for buyers to successfully make a claim against sellers, particularly where defects are latent and not discoverable at the time of sale or delivery. By introducing product-specific rules and clearer remedies, the new law is intended to modernize Thailand’s consumer protection framework and align it more closely with international standards, and to help relieve the buyer’s burden of proof against the seller in product liability cases. If enacted, the draft act will take effect 180 days after publication in the Government Gazette, giving businesses a transition period to assess their compliance obligations. This article provides an overview of the key provisions of the draft act and highlights some practical considerations for businesses operating in Thailand. Scope and Key Definitions The draft act applies to sellers—defined as persons who sell goods in the ordinary course of business—and protects buyers, a term defined broadly to include not just the original purchaser but also transferees and successors in title. This expands the class of people who can bring claims. The law does not apply to used goods, live animals, or goods exempted by future ministerial regulation. It also leaves intact any separate warranties, promises, advertisements, or other guarantees a seller has given; those remain enforceable alongside the new statutory rights. General Liability for Defective Goods Sellers are liable for defects that exist at the time of delivery, regardless of whether the seller knew about them. Liability arises where a defect reduces: The benefit intended under
Read More
June 22, 2026
Arbitrator independence and impartiality form the cornerstone of a legitimate arbitral process. Under section 19 of the Thai Arbitration Act B.E. 2545 (2002), prospective arbitrators must disclose circumstances likely to give rise to justifiable doubts as to their impartiality or independence, and existing arbitrators must do so throughout proceedings. This mirrors article 12 of the UNCITRAL Model Law. Yet despite this clear mandate, practical implementation varies significantly across Thailand’s arbitration landscape. Background Thailand’s two principal arbitration institutions, the Thai Arbitration Institute (TAI) and the Thailand Arbitration Center (THAC), both maintain procedures for addressing arbitrator challenges and require compliance with the statutory disclosure obligation. Under both sets of rules, any party wishing to challenge an arbitrator must submit a challenge application within fifteen days of becoming aware of the relevant facts, and a committee is appointed to consider the matter on a case-by-case basis. The TAI additionally prescribes its Code of Ethics and Conduct for Arbitrators to further emphasize the expectation of impartiality and transparency. However, Thailand’s arbitration ecosystem extends well beyond the TAI and THAC. Several sector-specific institutions also administer arbitral proceedings, including the Thai Commercial Arbitration Office under the Board of Trade of Thailand, the Arbitration Centre of the Office of the Insurance Commission, the Arbitration Centre of the Securities and Exchange Commission, the Office for the Prevention and Resolution of Disputes regarding Intellectual Property, and the Arbitration Centre of the Thai General Insurance Association. These institutions each operate under their own procedural rules, which were developed to serve particular industries and dispute profiles. The procedural mechanisms for securing and documenting an independence declaration are not uniformly established across these forums. Consequences of Procedural Inconsistency This creates a notable gap. Not all arbitration bodies have a formalized procedure requiring written independence statements before proceedings commence. Some tribunals proceed
Read More
June 16, 2026
The president of Thailand’s Supreme Court has issued new recommendations providing courts with criminal jurisdiction with a comprehensive framework for identifying and dismissing criminal cases brought in bad faith. Published in the Government Gazette on May 29, 2026, after being signed on May 25, the Recommendations of the President of the Supreme Court Concerning Bad-Faith Litigation in Criminal Cases B.E. 2569 were issued under Section 5 of the Act on the Organization of Courts of Justice. The recommendations took effect upon publication and represent a significant step in Thailand’s efforts to curb abusive criminal litigation, including strategic lawsuits against public participation (SLAPP). Background Section 161/1 of Thailand’s Criminal Procedure Code empowers courts to dismiss criminal cases filed dishonestly or with the intent to harass or take unfair advantage of a defendant. The new recommendations provide detailed guidance that courts previously lacked on identifying and handling such prosecutions. Definition of Bad-Faith Litigation Under recommendation 1, filing a criminal case in bad faith is defined broadly to encompass three categories: Harassment-type filings involving intimidation, threats, or creating unreasonable hardship for the defendant; Coercive filings designed to pressure the defendant into acting or refraining from acting for illegitimate benefit; and False or misleading filings that deliberately assert incorrect material facts or conceal such facts. Circumstances Indicating Bad Faith Recommendation 2 sets out specific circumstances that should raise a court’s suspicion that a filing may violate section 161/1. These include: Filing in a distant court far from the defendant’s domicile without benefiting the adjudication; Retaliation against the defendant’s advocacy for human rights, environmental protection, consumer rights, labor rights, or other public interests—effectively establishing an express anti-SLAPP framework; Retaliation against whistleblowers who disclosed corruption or unlawful conduct; Retaliation against individuals responsible for investigating the plaintiff’s wrongdoing or who concluded such an investigation; Filing multiple
Read More