Southeast Asian Exporters Brace for Renewed US Tariff Pressure

Fresh Tariff Wave Targets Regional Exporters

Southeast Asian manufacturers face a renewed round of US trade restrictions following the completion of a Section 301 investigation that imposed tariffs of 10 to 12.5 per cent on goods from most ASEAN countries. The investigation, centred on forced labour concerns, concluded in recent months alongside an ongoing probe into structural excess capacity. Cambodia, Indonesia, Malaysia, Thailand and Vietnam now confront 10 per cent levies, while the Philippines, Singapore and Thailand face 12.5 per cent rates.

The White House has also flagged most Southeast Asian economies as potential transhipment hubs for Chinese goods, citing a 30 per cent surge in the region's US-bound exports during 2025. Goods found to have been rerouted through Southeast Asia could incur an additional 40 per cent levy. Vietnam, Indonesia, Malaysia and Thailand have been classified as moderate to high exposure jurisdictions for transhipment risk, according to White House documents.

These measures follow the Supreme Court's January 2026 decision to strike down the administration's reciprocal tariff framework, which had imposed rates converging around 20 per cent for most ASEAN members. The Trump administration has since pivoted to alternative legal mechanisms, including plans to extend existing Section 232 sectoral tariffs to critical minerals, robotics, pharmaceuticals and aircraft components.

Short-Term Response: Price Pass-Through

Exporters confronted with the earlier reciprocal tariffs largely opted to pass costs directly to US buyers rather than absorb them through reduced margins. This behaviour differed from the first Trump administration's 2018 steel tariffs, when Chinese exporters absorbed roughly 30 per cent of the levy to maintain competitiveness.

The shift reflects a calculation that simultaneous tariffs on all trading partners reduced the relative disadvantage of raising prices. With tariff rates across ASEAN countries clustering near similar levels, firms saw limited benefit in sacrificing profit margins. Market data from the reciprocal tariff period indicates near-full pass-through, pushing up costs for US consumers and manufacturers.

Analysts expect the recently implemented Section 301 tariffs to follow the same pattern. The combination of broad-based levies and lingering uncertainty over future enforcement makes price absorption a less attractive strategy. US importers and downstream producers are likely to see input costs rise in proportion to the new tariff rates.

Supply Chain Reconfiguration Under Scrutiny

Multinational corporations have been relocating production capacity from China to Southeast Asia since the first wave of Trump-era tariffs in 2018, a trend that accelerated through 2025. The persistence of significantly higher tariffs on Chinese goods compared to ASEAN rates has sustained this shift, with Vietnam, Thailand and Malaysia capturing substantial foreign direct investment inflows.

That trajectory now faces headwinds. US Customs and Border Protection has signalled closer scrutiny of verification processes to detect alleged transhipment, exploiting ambiguities in rules of origin. Corporate executives are monitoring whether enforcement escalates into systematic crackdowns, which could slow or reverse investment flows into the region.

Reshoring to the United States remains more aspiration than reality. Despite high-profile corporate pledges to relocate manufacturing domestically, investment and trade statistics show minimal movement. Established supply chain networks, particularly for complex electronics and machinery, make relocation prohibitively expensive or operationally unfeasible for most firms.

Diversification Through Regional Agreements

ASEAN governments are intensifying efforts to reduce reliance on the US market through intra-regional integration and new trade partnerships. The Regional Comprehensive Economic Partnership, which entered into force in 2022, is scheduled for a major review in 2027. The agenda includes digital trade rules, supply chain resilience frameworks and streamlined non-tariff procedures, measures intended to deepen intra-ASEAN commerce.

Indonesia concluded a Comprehensive Economic Partnership Agreement with the European Union earlier this year, while negotiations between the EU and Malaysia, Thailand and the Philippines have gained momentum. Indonesia has also finalised a CEPA with the United Arab Emirates, and ASEAN is formalising regular summit engagement with the Gulf Cooperation Council.

These initiatives reflect a strategic pivot to hedge against volatility in US trade policy. However, export data shows the transition remains gradual. Despite stated intentions to diversify, Southeast Asian shipments to the US surged in 2025, underscoring the difficulty of rapidly reorienting trade flows away from the world's largest consumer market.

Legal Authority and Market Volatility

The Supreme Court's rejection of the reciprocal tariff framework on grounds that it exceeded executive authority has paradoxically increased uncertainty. The Trump administration responded by channelling protectionist measures through Section 301 and Section 232 statutes, which rest on more established legal foundations and may prove harder to challenge in court.

Tariff rates imposed under these authorities could endure longer and cover a wider range of products than the invalidated reciprocal scheme. The ongoing Section 301 investigation into structural excess capacity may extend levies to additional sectors, while proposed Section 232 expansions target industries deemed critical to national security.

For exporters, the shift from a single broad tariff framework to multiple overlapping investigations complicates compliance and planning. Firms must now track separate proceedings for forced labour, excess capacity, transhipment allegations and sectoral security reviews, each with distinct timelines and evidentiary standards.

Mixed signals compound the challenge. While the administration debates tariff reductions on non-sensitive items with China ahead of a scheduled Trump-Xi summit in September 2026, investigations targeting multiple trade partners continue, and a separate trade dispute with Canada has escalated into reciprocal restrictions.

Outlook for Regional Exporters

Southeast Asian manufacturers enter the second half of 2026 navigating a fragmented and unpredictable trade environment. Short-term strategies centre on price adjustments to preserve margins, while longer-term responses hinge on the outcome of transhipment enforcement and the durability of tariff differentials between China and ASEAN.

The region's attractiveness as a manufacturing base depends on maintaining a material tariff advantage over China and avoiding classification as a conduit for Chinese goods. If US Customs enforcement tightens significantly, the investment case for Southeast Asian production weakens, potentially stalling the supply chain realignment that has driven growth in Vietnam, Thailand and Malaysia over the past five years.

Regional trade agreements offer a partial buffer, but diversification away from the US market will unfold over years rather than quarters. In the interim, ASEAN exporters face a trade policy landscape defined by overlapping legal authorities, selective enforcement and the persistent risk that today's tariff rates are merely a floor for future increases.