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

March 5, 2025

How Importers in Thailand Can Win Customs Assessments: The WCO’s Explanatory Notes

It is a common misconception that importers will never win classification assessments by the Thai Customs Department. However, this belief is far from the truth. Importers can indeed prevail in customs assessments, and one of the most effective tools at their disposal is the World Customs Organization’s (WCO) Explanatory Notes.

The WCO’s Explanatory Notes are an indispensable resource for understanding the Harmonized System (HS) of tariff nomenclature. These notes provide detailed commentary on the scope of each heading, including lists of main products included and excluded, technical descriptions, and practical guidance for identifying goods. By leveraging these notes, importers can ensure accurate classification of their goods, which is crucial for fair customs assessments.

Understanding the Explanatory Notes

The Explanatory Notes serve as the official interpretation of the Harmonized System at the international level. They offer clarity on the classification of goods, which can significantly impact the duties and taxes imposed on imports. For instance, the notes provide insights into the properties, methods of production, and uses of various goods, helping importers to classify their products correctly and avoid misclassification disputes.

Thailand’s Customs Tariff Decree holds that the classification interpretation must follow the General Rules for Interpretation together with the Explanatory Notes to the Harmonized System of the WCO. Most Thai Supreme Court decisions on classification also refer to the WCO’s Explanatory Notes and past rulings as the basis of their decisions.

Successful Appeals

There have been numerous instances of importers successfully appealing customs assessments by relying on the Explanatory Notes. For example, one importer of electronic components was initially assessed a higher duty due to misclassification. By presenting evidence from the Explanatory Notes that accurately described the components, the importer was able to demonstrate the correct classification and secure a favorable reassessment.

Practical Steps for Importers

To minimize the risk of misclassification in customs assessments, importers should:

  • Familiarize themselves with the notes: Importers should thoroughly understand the relevant sections of the Explanatory Notes that pertain to their goods.
  • Document and present evidence: When disputing a customs assessment, importers should provide detailed documentation and reference the specific sections of the Explanatory Notes that support their case.
  • Request an advance ruling on classification: This process allows importers or exporters to submit a request to the Customs Department for a ruling on the tariff classification of goods to be imported or exported in advance.
  • Seek expert advice: Consulting with customs brokers or legal experts who are well-versed in the Explanatory Notes can provide additional support and increase the chances of a successful appeal.

Conclusion

The notion that importers will never win customs assessments is a myth. By relying on the WCO’s Explanatory Notes, importers may be able to challenge and overturn unfair assessments. The key lies in understanding and utilizing these notes to ensure accurate classification and fair treatment in customs processes. Importers should not be discouraged by initial assessments but should instead leverage all available resources to advocate for their rights.

RELATED INSIGHTS​ 

July 4, 2025
On July 3, 2025, the Trade Competition Commission of Thailand (TCCT) officially announced an invitation for stakeholders to participate in a public survey to gather feedback on the flexibility and appropriateness of credit terms across different business sectors for goods and services. The TCCT initially introduced guidelines on unfair trade practices related to credit terms applicable to small and medium-sized enterprises (SMEs) in 2021, with amendments following in 2022. The guidelines have had a wide impact, as businesses have had to adapt their payment procedures and practices, particularly those for dealing with SMEs, to comply with the guidelines. The TCCT is now seeking comprehensive feedback from businesses and other stakeholders to evaluate the effectiveness and practicality of these guidelines. The collected responses may potentially lead to future amendments aimed at enhancing fairness and efficiency in business transactions. To summarize the core principles, the guidelines aim to improve the liquidity and cash flow of SMEs, stipulating payment terms of: Within 30 days for agricultural products or primary agricultural processing involving non-complex production. Within 45 days for trade, manufacturing, and service sectors. The guidelines also identify practices deemed unfair, including: Unjustified delays in payment beyond agreed credit terms. Changes to credit terms or contractual conditions without at least 60 days’ advance notice. Other unfair conduct or credit term conditions that impose excessive burdens on an SME. Interested stakeholders are encouraged to submit their feedback through the TCCT’s online survey form available via their official public media channels. The survey is open for responses until July 20, 2025.
June 17, 2025
On January 9, 2025, the Lao official gazette published the newly amended Decision on Trade Inspection Implementation No. 0019/MOIC, dated January 6, 2025. This decision aims to establish principles and rules for trade officers to inspect, fine, and take measures against violators of trade laws and their related regulations on business competition, business operations, and intellectual property rights to protect consumers and business operators in Laos. Changes in Trade Inspection Procedures Previously, trade inspection officers, operating independently under the central Ministry of Industry and Commerce (MOIC) or the provincial-level Department of Industry and Commerce (DOIC), were responsible for administrative raid actions focusing exclusively on intellectual property issues. However, following the enactment of Decision No. 0019/MOIC, trade inspection officers will now be grouped into the Trade Officers Unit, which will also include business competition officers and consumer protection officers. This unit will conduct and participate in raids, considering not only intellectual property laws but also competition and consumer protection laws when imposing penalties on infringers. Trade Inspection Authority Levels Trade inspection implementation is overseen by authorities at three levels: Central level: Department of Business Competition and Trade Inspection, MOIC. The MOIC handles trade inspection work covering all provinces in Laos. Provincial level: DOIC offices in provinces and Vientiane handle trade inspections covering two or more districts. District level: Office of the Industry and Commerce offices in districts. Violations Individuals, legal entities, and organizations violating the newly amended trade inspection decision, the Decree on Trade Inspection, or other related regulations will be educated about the issue, warned, disciplined (for government servants), fined, subject to compensation for damage incurred, or punished by the relevant laws, depending on the gravity of the violation. Trade Violations Violations of trade laws and regulations concerning business operations will result in fines and additional measures. Examples include:
June 11, 2025
Myanmar’s Ministry of Commerce has established new regulatory measures for importing electric vehicles (EVs) as part of a pilot project running from January 2025 to March 31, 2026, while the Ministry of Planning and Finance has reduced customs duty rates for fuel-powered vehicles manufactured domestically under semi-knocked down (SKD) and completely knocked down (CKD) systems, effective June 1, 2025, to May 31, 2026. Importation of EVs On May 29, 2025, Myanmar’s Ministry of Commerce (MOC) issued an announcement regarding the importation of EVs from abroad as part of its pilot project, detailed in MOC Notification No. 40/2025. The MOC notification establishes the following regulatory measures to support the development of EVs and related businesses: Approval must be obtained from the National-Level Steering Committee for the Development of Electric Vehicles and Related Enterprises. A registration certificate for an EV sales showroom must be secured. Vehicles must be imported in accordance with the permitted number and standards defined by the National-Level Steering Committee for the Development of Electric Vehicles and Related Enterprises. The importing company must provide necessary arrangements for warranties on imported EVs, spare parts, and after-sales services. For companies wishing to open a sales showroom, the following requirements apply: The company must be a registered national or joint venture entity with the Directorate of Investment and Company Administration. The company must be officially appointed as a distributorship or dealership by the original company or regional office for each brand. A permit from the respective state or regional government and a business license from the respective Municipal Committee must be obtained. The company must provide evidence of tax clearance issued by the Internal Revenue Department. Standards for the showroom, building, and warehouse, as issued periodically by the MOC, must be adhered to, including: Compound area: 10,000 square feet (the total
May 28, 2025
Tilleke & Gibbins attorneys in Vietnam have contributed the 2025 edition of Doing Business in Vietnam, a comprehensive Q&A-style resource from Thomson Reuters Practical Law that provides essential insights for companies navigating business operations in Vietnam. The guide presents a detailed overview of the country’s legal framework and regulatory environment, reflecting recent updates in Vietnamese legislation and practice. This annually updated guide offers key information on the following areas: Legal system: Structure of the Vietnamese judiciary and the role of codified law. Foreign investment: Conditions for market access, licensing requirements, foreign ownership restrictions, and investment incentives. Business vehicles: Formation and operation of legal entities, including limited liability companies, joint-stock companies, and representative offices. Employment: Employment contracts, social insurance, labor rights, and procedures for hiring foreign nationals. Tax: Overview of corporate income tax, personal income tax, value-added tax, and other tax obligations. Intellectual property: Procedures for protecting and enforcing patents, trademarks, copyrights, and other IP rights. Data protection: Compliance requirements under Vietnam’s data privacy laws, including the Personal Data Protection Decree. Competition law: Antitrust rules and regulatory oversight under the Law on Competition. Anti-bribery and corruption: Legal framework and enforcement practices aimed at curbing corrupt activities. E-commerce and digital business: Regulations governing online platforms, digital content, and cross-border services. Marketing and advertising: Laws and guidelines on advertising standards and consumer protection. Product regulation and liability: Safety requirements, product liability issues, and roles of relevant authorities. Doing Business in Vietnam is part of Practical Law’s global series of legal guides designed to support international practitioners and businesses. To access the most recent edition of the Vietnam guide, visit the Practical Law website and sign up for a free trial.