On July 24, 2026, a new 12.5% Section 301 tariff took effect on most imports from Thailand into the United States. The tariff was imposed by the Office of the US Trade Representative (USTR) under Section 301 of the Trade Act of 1974, following a finding that Thailand had failed to impose and effectively enforce a prohibition on imports of goods produced with forced labor. The new tariff replaced the temporary 10% Section 122 surcharge that had applied since February 24, 2026, following the US Supreme Court’s invalidation of the prior tariffs imposed under the International Emergency Economic Powers Act (IEEPA). The 12.5% tariff is not the only potential source of additional US duties on Thai-origin goods. Thailand is also subject to a separate Section 301 investigation concerning structural excess manufacturing capacity, which could result in additional duties. Unlike the Section 122 surcharge, which was capped at 15% and limited to 150 days, Section 301 provides a more flexible framework for imposing and maintaining trade measures. Section 301 actions are generally subject to a four-year termination rule but may continue following a review if continuation is requested. The new tariff therefore represents a potentially longer-term change in the tariff treatment of Thai-origin goods entering the US market. This article explains the legal and policy developments that led to the new tariff, how the Section 301 tariff differs from the tariff regimes that preceded it, Thailand’s response and ongoing negotiations with the United States, and the practical implications for businesses that manufacture, export, import, or distribute goods between Thailand and the United States. From IEEPA to Section 122 to Section 301 IEEPA Era (April 2025–February 2026) Beginning in April 2025, the US administration imposed sweeping tariffs under the International Emergency Economic Powers Act (IEEPA), invoking national emergencies relating to trade

On September 23, 2026, the Trade Competition Commission of Thailand (TCCT) launched a one-month public consultation period on a proposed notification that would overhaul how antitrust offenses under the Trade Competition Act B.E. 2560 (2017) are settled and penalized. The draft notification would replace the existing 2019 settlement framework with more detailed procedures, introduce offense-specific methods for fine calculation, and add tiered deterrence multipliers. Comments may be submitted until October 22, 2026. Restructured Settlement Procedures and Timelines The proposed notification formalizes the settlement process with clearer terminology and mandatory procedural steps. Once the TCCT determines that an accused party has committed an offense that does not warrant imprisonment, the commission would fix the settlement fine amount. The accused would have 15 days from receipt of the summons to appear before the TCCT, though this period may be extended if necessary. If the accused confesses, consents to settlement, and pays the fine within the prescribed period, the criminal case would be closed and the settlement recorded. Refusals would also be recorded for further arrangements, and failure to appear, pay, or consent would result in the TCCT forwarding the case file and its recommendation—along with the accused’s fingerprints—to the public prosecutor. Notably, the draft allows accused parties to request settlement even after the TCCT has recommended prosecution but before the public prosecutor files charges, subject to prosecutorial consent. The draft preserves TCCT discretion to decline settlement where the accused has committed more than three prior offenses or where the violation has substantially impaired free and fair competition, directing such cases directly to prosecution. Fine Calculation Frameworks The proposed notification establishes different fine calculation approaches depending on the type of Trade Competition Act violation. For the most serious offenses (such as abusing market dominance, making anticompetitive agreements, or forming hardcore cartels) the

Thailand has expanded the mandatory use of the Electronic Government Procurement (e-GP) system to cover submissions of procurement appeals to all government agencies subject to the Public Procurement and Supplies Administrative Act B.E. 2560 (2017) (Government Procurement Act). The expansion, which was set out in an official circular dated September 16, 2026, from the Public Procurement and Supplies Administrative Ruling Committee, takes effect on October 1, 2026. Notable Changes Under the expanded framework, bidders challenging an e-bidding or selective-method procurement result must file their appeal exclusively through e-GP within seven working days of the result being announced by the Comptroller General’s Department. While the system accepts filings around the clock during that window, submissions on the final day must be fully completed by 16:30 according to the e-GP system clock—merely starting a draft or uploading materials before the cutoff does not count as a confirmed submission. Government agencies that disagree with an appeal, in whole or in part, will also report their findings and supporting documents to the Appeals Committee through e-GP using the prescribed Appeal Opinion Report, also within seven working days of receipt. Withdrawals of appeals must likewise follow prescribed e-GP steps that vary depending on whether the matter is still under agency review, has been forwarded to the Appeals Committee, or has already been resolved. Excluded Categories Certain categories of procurement are not subject to the new guidelines on filing appeals electronically. These include: Procurement of supplies for confidential government use. Procurement conducted by government agencies operating overseas where the bidder is a foreign legal entity with no legal representative in Thailand, or where the bidder is a non-Thai national. Consulting service procurement under chapter 7 of the Government Procurement Act Design or construction supervision procurement under chapter 8 of the Government Procurement These exclusions apply

On September 22, 2026, the Trade Competition Commission of Thailand (TCCT) opened a one-month public consultation period on proposed amendments to three key competition regulations, covering (1) the criteria for determining market dominance, (2) the definition of “monopoly” under Thailand’s premerger approval regime, and (3) the definition of a merger that may substantially lessen competition under Thailand’s postmerger notification regime. The public hearing period closes on October 21, 2026. The proposed changes could significantly affect merger filing obligations and the assessment of market dominance under the Trade Competition Act B.E. 2560 (2017) (TCA). The scope of the consultation and the proposed changes are outlined below. Market Dominance Criteria The draft notification on market dominance criteria proposes changes to the tests for both single-firm dominance and collective dominance, which would be measured using concentration ratios, as follows: Single-firm dominance: The proposed changes would lower the market-share threshold from 50% to 33% and the sales-turnover threshold from THB 1 billion to THB 500 million for the preceding year. Collective dominance: The three-firm concentration ratio (CR3) currently being used would be replaced by a two-firm concentration ratio (CR2). Under the new regime, the two largest operators in a relevant market would be considered dominant if their combined market share reached at least 75% in the preceding year. However, any business operator with sales turnover below THB 500 million or a market share below 10% would be excluded from this assessment. In addition to static or numerical thresholds, the proposed notification introduces a dynamic threshold or alternative criteria for assessing dominance in markets that change rapidly, experience short-term fluctuations in demand or supply, or use technology as a platform for conducting business, such as digital markets. Premerger and Postmerger Filing Thresholds Under the TCA, a premerger filing is required if a merger transaction