Getting Customs Valuation Right: How Discounts Affect Import Declarations in Thailand

Sumet Mingmongkolmitr (Senior Partner)

In today’s global economy, commercial transactions increasingly cross geographic boundaries. For Thai or multinational companies operating in Thailand, importing goods, products, or raw materials from abroad for business use or trade has become standard practice.

The rising and increasing volume of import transactions naturally heightens the risk of facing legal and customs -related issues. One such example occurs when imported goods are found to contain defects. Instead of returning or exchanging these items, which may not be cost-effective, the supplier might offer a discount on a future order as compensation. This situation raises an important question in the import process in Thailand: What product price should be declared in the import declaration at Customs when such discounts are involved?

Under the Thai Customs Procedures, importers must declare the transaction value in their import declaration, which customs duties are then calculated and paid. In practice, some importers declare a value after deducting supplier-provided discounts, and Thai customs officials usually accept these declarations without issues. However, in other cases, customs officials may request the importers to use the original product price (before discount) as the transaction value, on the basis that the type of discount does not criteria under the relevant Thai customs regulations.

Therefore, importers need to carefully consider discounts when submitting import declarations. Not all discounts are eligible for deduction, as eligibility depends on factors such as the nature of the discount, the type of goods, and the value or quantity of the involved products.

Blumenthal Richter Sumet & Schuler Receives Three Practice Area Rankings and Two Individual Rankings in Chambers & Partners Asia-Pacific Guide 2026

Blumenthal Richter Sumet & Schuler is pleased to share that our firm has been recognized with three practice area rankings and two individual lawyer rankings in the recently released Chambers & Partners Asia-Pacific Guide 2026.

Our firm received recognition in the following practice areas:

  • Real Estate — Led by Senior Partner Robert Schuler and Partner Weerasa Makepongtorn, the practice was ranked for the seventeenth consecutive year and is currently recognized as a Band 2 practice, reaffirming the firm’s longstanding leadership in the Thai real estate market.
  • Tax — Led by Senior Partner Sumet Mingmongkolmitr and Partner Promboon Sookatup, the practice earned its sixth listing in this directory and is currently recognized as a Band 2 practice, highlighting its strength in complex tax and customs matters.
  • Corporate / M&A — Led by Senior Partner Andreas Richter and Partners Stefan Riedl and Ekkarat Ritthiplang, the practice was recognized for the second consecutive year and is currently recognized as a Band 5 practice, reflecting the team’s growing market presence and deal-making capability.

In addition, two of the firm’s lawyers received individual distinctions:

  • Robert Schuler, Head of Real Estate & Hospitality Practice, was individually ranked for the tenth time, reflecting his continued reputation as a leading practitioner in Thailand.
  • Sumet Mingmongkolmitr, Head of Tax & Customs Practice, was individually ranked for the ninth time, further underscoring his standing as a trusted advisor on complex tax and customs matters.

Chambers & Partners is one of the world’s most respected legal directories, ranking law firms and lawyers across more than 200 jurisdictions based on in-depth research, client feedback, and independent market analysis. Its annual rankings are widely regarded as a benchmark for excellence in the global legal industry.

These recognitions come after a year of historic growth for the firm. Blumenthal Richter Sumet & Schuler recently relocated to its new premises at One Bangkok to accommodate its expanding team and service offerings, including the acquisition of another firm that strengthened its multi-disciplinary capabilities.

 

 

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