October 2, 2026
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 deficits and other concerns. Thailand