Section 301: April 15 Deadline for 16 Asian Economies — Tariffs Possible by July

The April 15 Deadline: Last Chance to Be Heard

With roughly 10 days remaining, April 15, 2026 marks a critical juncture in USTR's Section 301 investigation. This is the final deadline for governments, businesses, and trade associations to file written comments presenting evidence about their trade practices. Every submission becomes part of the official record USTR uses to determine tariff rates.

According to USTR filings analyzed by Holland & Knight, this public comment process is what distinguishes Section 301 from previous IEEPA orders that took effect immediately without investigation. This shift — from unilateral executive action to formal legal process — is why trade experts call Section 301 Washington's "durable trade weapon."

If you are a Vietnamese exporter who hasn't filed comments with USTR, you have roughly 10 days to act. Each percentage point of tariff could affect hundreds of millions in revenue.

Investigation Timeline: Critical Milestones

USTR announced two separate investigations on March 11-12, 2026. The first targets 16 economies for manufacturing overcapacity. The second, broader probe covers 60 economies for forced labor concerns. Below are the critical milestones to monitor closely.

Export businesses should closely track the April 28 and May 5 hearing outcomes. Results will indicate whether USTR favors selective industry tariffs or broad country-wide tariffs — directly impacting business strategy.

From IEEPA to Section 301: Why This Time Is Different

After the Supreme Court struck down IEEPA tariffs, the Trump administration pivoted to Section 301 — a legal tool with precedent from prior trade wars with China. The core difference lies in process: IEEPA allowed immediate tariffs via executive order, while Section 301 demands formal investigation with evidence, hearings, and public comment periods.

According to Fortune, this shift is not merely tactical but strategic. Section 301 tariffs, once imposed, can persist across presidential terms because they are grounded in specific Congressional legislation, not just executive authority. This is why economists call it America's "new trade regime" with Asia.

For Vietnamese exporters, this means Section 301 tariffs are no longer a temporary threat. If imposed, they could persist 5-10 years or longer. Business plans must account for a long-term scenario.

Targeted Sectors and Risk Assessment

The Section 301 investigation covers strategic industries that Washington alleges are distorted by government subsidies and manufacturing overcapacity. Electronics and semiconductors represent the largest share of affected trade, followed by automobiles and EV batteries. Below is a detailed risk assessment by sector.

Regional Reactions: From Cooperation to Defiance

Reactions from investigated nations vary dramatically. Malaysia responded most forcefully, declaring a previous US trade deal "null and void," as reported by Asia Times. China warned it would restrict rare earth exports — essential materials for US semiconductor and defense industries — if Section 301 tariffs expand.

Japan and South Korea, with longstanding US alliances, are using diplomatic channels. Vietnam, according to industry reports, is pivoting to an "active cooperation" strategy — increasing US purchases and working with USTR on supply chain transparency. Cambodia and Bangladesh, heavily dependent on textile exports to the US, are concerned about major social impact given the labor-intensive nature of their export sectors.

If China follows through on rare earth restrictions, global semiconductor and electronics prices could rise 15-30%. Vietnamese consumers would feel the impact through phone, laptop, and imported car prices.

Vietnam: $50B and the "Real Value" Question

Vietnam's electronics exports to the US exceeded $50 billion in 2025, driven by the wave of manufacturing shifts from China. But the core question USTR is asking is: how much value is genuinely created in Vietnam? Some "Made in Vietnam" products are merely assembled in Vietnam with Chinese components, an activity USTR calls "transshipment" to evade tariffs.

If you work at Samsung, Foxconn, or factories in Bac Ninh/Thai Nguyen, US-bound orders could be directly affected. Every 10% tariff could increase product costs by 15-20% due to supply chain amplification effects.

What Comes Next? Three Scenarios for Late 2026

5 Action Steps for Vietnamese Businesses

Frequently Asked Questions