IN Brief:
- Washington's central estimate links illegal transshipment to $19 billion–$26 billion in annual lost US federal revenue.
- Vietnam says it will continue constructive dialogue as origin and tariff enforcement remain under scrutiny.
- Importers face growing pressure to substantiate production history, supplier declarations, classification, and country-of-origin claims.
Vietnam’s Ministry of Foreign Affairs has said Hanoi will continue dialogue with the United States over concerns about goods being routed through Vietnam and other third countries to avoid higher US import duties. The issue is placing greater weight on country-of-origin evidence as tariff gaps widen across Asian sourcing networks.
Washington estimates that illegal transshipment costs the United States between $19 billion and $26 billion a year in federal revenue under its central-case analysis. Vietnam was among the third countries identified in current US scrutiny of goods originating largely in China and entering the American market after being rerouted or subjected to limited processing elsewhere.
Foreign Ministry spokesperson Pham Thu Hang said Vietnam would continue to engage constructively with the US within the framework of the two countries’ Comprehensive Strategic Partnership. Hanoi’s response does not accept the US estimate as a settled measure of Vietnamese trade, but it confirms that transshipment controls and origin enforcement will remain part of bilateral economic discussions.
The commercial distinction between legitimate supply chain diversification and illegal transshipment is straightforward in principle and much harder in practice. Manufacturers can lawfully move production into another country, add sufficient value, and export a product under that country’s origin rules, but routing finished or near-finished goods through a lower-tariff jurisdiction does not automatically change origin.
That leaves importers increasingly dependent on evidence from suppliers. Bills of materials, manufacturing records, tariff classifications, certificates of origin, supplier declarations, and transport documents all become relevant when customs authorities test whether a claimed production history reflects what actually happened. Weak documentation can create exposure even where the physical routing itself is unremarkable.
Vietnam’s rapid expansion as a manufacturing base makes that scrutiny commercially significant. Electronics, machinery, furniture, textiles, and other export sectors have attracted investment from companies seeking to diversify production beyond China, while existing Chinese supply relationships continue to feed many Vietnamese factories. The resulting networks can contain genuine manufacturing relocation, component trade, and suspicious routing at the same time.
The White House analysis uses several approaches to estimate the scale of illegal transshipment, ranging from narrower transaction matching to broader exposure assumptions. Its central case estimates roughly $75 billion in annual illegal transshipment flows and links those flows to $19 billion to $26 billion in lost federal revenue. Those figures are US government estimates rather than jointly agreed trade data, but they signal the level of enforcement attention now being attached to the issue.
Customs teams are likely to feel the effect before transport networks change dramatically. Importers may seek stronger contractual warranties on origin, more detailed supplier audits, and clearer escalation procedures when production moves between factories or countries. A sourcing decision that once focused on unit cost, lead time, and capacity can now carry an additional requirement to prove how the product acquired its declared origin.
Freight forwarders and customs intermediaries also have less room to treat documentation as a purely administrative layer. A shipment can move through the correct port, under the correct transport document, and still encounter problems if the commercial origin trail is weak or inconsistent. Classification, routing, bonded storage, customs declarations, and production evidence are increasingly linked within the same compliance process.
Manufacturers using Vietnam as part of a China-plus-one strategy now face policy risk concentrated in traceability rather than geography alone. Sourcing from Vietnam is not inherently problematic, but a supplier that relies heavily on Chinese inputs, performs limited transformation, or cannot demonstrate its production steps may attract closer examination when tariff differentials are large.
The dispute also gives Vietnam an incentive to protect the credibility of its export manufacturing base. Genuine foreign investment depends on buyers being confident that Vietnamese-origin goods will clear major markets without repeated origin challenges. Stronger domestic enforcement against fraudulent routing can therefore support legitimate exporters even as it raises compliance costs for some traders.
No immediate change to US tariff treatment was announced alongside Hanoi’s latest statement. The next practical development will be whether bilateral discussions produce tighter verification procedures, more data sharing, or new enforcement activity. Until then, origin evidence is becoming a core operating requirement for supply chains built around tariff-sensitive Asian trade. Buyers that cannot reconstruct the production trail may find tariff exposure arriving long after the purchase order was signed.
