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Panchaya Rattanaumnuaishai

Associate

Biography

Panchaya Rattanaumnuaishai is an associate in Tilleke & Gibbins’ dispute resolution department in Bangkok. She provides a diverse array of legal services relating to both domestic and international disputes concerning breach of contract, construction, international trade, and labor disputes, including all stages of litigation and prelitigation. She places a great emphasis on offering high-quality legal services that help clients navigate intricate legal challenges. By working with each client to deliver favorable outcomes, Panchaya acts as a trusted advisor and a skilled advocate for companies facing challenges or disagreements in the course of their business activities in Thailand.

Panchaya earned her LLB degree from Chulalongkorn University, during which she also gained work experience in the energy practice of another leading law firm in Bangkok.

Experience

  • Assisted in representing one of the world’s leading surveying companies in defending against claims of breach of a service contract and wrongful acts, winning a favorable court judgment with all the claims being dismissed.
  • Advised a client in the automotive industry on prelitigation procedures in a dispute against one of its contractors.
  • Advised the subsidiary of a global chemical company on potential arbitration proceedings regarding breach of a construction contract.
  • Assisted a commercial bank with a business reorganization matter by preparing its application seeking debt repayment.
  • Advised a logistics company on potential administrative action to seek a return of tariffs.
  • Assisted in representing a foreign corporation in the scientific technology industry in defending against claims of breach of a service contract and wrongful acts.
  • Advised domestic and international clients on the importation and exportation of products and on appealing against tariff assessments made by the authorities.
  • Assisted a team in acting for corporate clients in employment disputes related to unfair termination and cases against a labor union.
ABOUT Panchaya

Practices

Compliance and Investigations

Dispute Resolution and Litigation

Employment

Location

Languages

    Thai

    English

Education

    LLB, Chulalongkorn University

Insights

August 20, 2026
As part of its membership in Lex Mundi, Tilleke & Gibbins has released the latest edition of its Guide to Doing Business in Thailand, providing an overview of the legal, regulatory, and commercial considerations for companies establishing or expanding operations in Thailand. The 2026 edition offers practical insight into the country’s business environment, investment framework, and operational requirements. The guide covers a wide range of topics relevant to foreign and domestic investors, including: Investment incentives and promotion schemes Financial facilities and banking regulations Exchange controls and money transfers Import and export regulations Business structures and incorporation options Requirements for establishing a business Operational and compliance considerations Business cessation and insolvency procedures Employment and labor laws Taxation Immigration and visa requirements Prepared by Tilleke & Gibbins lawyers across multiple practice areas, the publication outlines key aspects of doing business in Thailand, including foreign investment restrictions, regulatory compliance obligations, corporate structures, employment requirements, and recent legal and economic developments affecting investors. The publication forms part of Lex Mundi’s Country Guides series, a global collection of jurisdiction-specific reference materials prepared by member firms around the world. Together, these guides help companies evaluate opportunities, compare regulatory environments, and plan international business activities across multiple markets. The full Guide to Doing Business in Thailand 2026 is available through the button below.
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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
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January 29, 2026
Following the recent enactment of a comprehensive legal framework addressing sexual harassment, Thailand has launched a fast-track judicial process enabling victims of online sexual harassment to obtain court orders suspending and removing obscene content from the internet. On January 26, 2026, the Office of the Judiciary introduced the “Take It Down” procedure through the Court Integral Online Service (CIOS) platform, providing victims with their first direct, expedited pathway to halt the spread of online content that violates the new legal provisions against sexual harassment. This new remedy stems from section 284/4 of the Penal Code, introduced through the Act Amending the Penal Code (No. 30) B.E. 2568, which took effect on December 30, 2025. Under section 284/4, an injured person or a competent official may petition the court to suspend dissemination of violating data and remove the data from computer systems within a court-specified period. The court may also direct system controllers, service providers, or competent authorities to carry out the order and report back within 15 days. Filing through the CIOS Platform The CIOS platform serves as the primary electronic channel for these petitions. Key features include: Individuals can file online without appearing in person and may submit petitions at any time the system is available. Users must complete digital identity verification via the ThaID application to access the CIOS. Petitions under section 284/4 are limited to requests to suspend or remove violating content. Claims for monetary damages must be pursued separately, including via separate proceedings or prefiling mediation. Streamlined Review Process The submission workflow is end-to-end electronic, and the system provides step-by-step guidance. After submission, court staff review the petition before presenting it to a judge for consideration. The court may conduct an online inquiry to obtain additional information, and in-person attendance is required only if deemed
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December 12, 2025
Similar to other types of corporate disputes, tax-related conflicts often begin with an earnest attempt to resolve matters outside the courtroom. The prospect of engaging in tax litigation can be daunting, given the potential strain on commercial relationships, the legal expenses, and the uncertainty surrounding its resolution. However, there are instances when tax litigation becomes the sole avenue for seeking redress. For individuals and entities contemplating the pursuit of tax-related legal remedies, the Thai legal system offers an accessible, impartial, and equitable platform for dispute resolution. Tilleke & Gibbins’ latest update to Tax Litigation in Thailand provides an outline for navigating tax-related disputes within the Thai legal framework. It aims to equip readers with a fundamental understanding of procedures and practices within the Thai tax litigation landscape. The full guide is available through the button below.
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Awards & Rankings

May 11, 2026
Tilleke & Gibbins has continued to show excellent performance in the recently released Benchmark Litigation 2026 rankings for dispute resolution firms in the Asia-Pacific region. The rankings include two jurisdictions where Tilleke & Gibbins is active: Thailand and Vietnam. Firm Rankings A full summary of the firm’s rankings is provided below: Thailand Commercial & Transactions – Tier 1 Government & Regulatory – Tier 1 Labor & Employment – Tier 1 Intellectual Property – Tier 1 Trade & Customs – Tier 2 Vietnam Commercial & Transactions (Foreign Firms) – Tier 1 Intellectual Property (Foreign Firms) – Tier 1 Labor & Employment (International Firms) – Highly Recommended (top tier awarded in this category) White Collar Crime – Recommended (top tier awarded in this category) Energy & Construction (Foreign Firms) – Tier 2 International Arbitration – Tier 2 Individual Rankings The 2026 edition also recognizes 12 Tilleke & Gibbins lawyers in Thailand—more than any other firm in the jurisdiction—and four in Vietnam. Thailand Alongkorn Tongmee – Trade & Customs Chitchai Punsan – Commercial & Transactions Chusert Supasitthumrong – Labor & Employment John Frangos – Commercial & Transactions Noppramart Thammateeradaycho – Shipping Nuttaphol Arammuang – Intellectual Property Piyawat Vitooraporn – Commercial & Transactions Pongpalin Chantrapirom – Commercial & Transactions Suebsiri Taweepon – Intellectual Property Suruswadee Jaimsuwan – Commercial & Transactions Thawat Damsa-ard – Commercial & Transactions Tiziana Sucharitkul – Commercial & Transactions, Government & Regulatory Vietnam Duc Anh Tran – Commercial & Transactions Linh Duy Mai – Intellectual Property Loc Xuan Le – Intellectual Property Tu Anh Tran – Commercial & Transactions Benchmark Litigation’s annual research is based on interviews with dispute resolution specialists and clients, as well as analysis of recent casework and market developments. To view the full results, please visit the Benchmark Litigation websites for Thailand and Vietnam.
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