Battery and EV Supply Chains: Chinese Enterprises Assembling in Vietnam Facing EVFTA Origin Rules and EU Investigations

Batteries and electric vehicles are the most heavily origin-scrutinised goods in today supply chains: the EU has imposed countervailing duties on EVs from China and views every assembly plant in a third country through an anti-circumvention lens. A Chinese enterprise assembling in Vietnam must therefore answer two question systems at once: the EVFTA origin rules for its product, and the EU investigation mechanisms for China-origin goods routed through Vietnam.

Governing Instruments

EVFTA origin rules applying to batteries and EVs assembled in Vietnam

The starting point must be stated plainly: the EVFTA has no single general “local content threshold” for all products. Origin criteria are set per tariff line in the product-specific rules annex of the Agreement (current domestic guidance is Circular 14/2026/TT-BCT replacing Circular 11/2020/TT-BCT from 10 May 2026): each HS line for batteries (heading 8507) and electric vehicles (headings 8703, 8704 and component lines) has its own criterion in one of the forms — change in tariff classification (usually at heading or sub-heading level), regional value content (RVC) with a threshold fixed for that line, or a combination allowing a choice. The enterprise must look up the exact HS line of its product to learn the applicable threshold, instead of using a word-of-mouth figure.

The second barrier is the EVFTA list of insufficient operations: simple operations such as simple assembly from complete component kits, packing, labelling, testing, charging and calibration do not by themselves confer origin, even if the final product changes form. For a model importing battery kits or vehicle kits from China for assembly, this is the decisive point: if the Vietnam process is only basic assembly from components finished abroad, the goods do not achieve Vietnamese origin for the EVFTA regardless of the calculated value ratio, because insufficient operations are excluded from the assessment before thresholds are even considered. Conversely, battery cell production, module packing with real technological steps, or manufacturing constituent assemblies in Vietnam are stages capable of creating substantial transformation — the exact boundary must be analysed on the real production process of each plant.

EU investigation mechanisms for goods with Chinese inputs via Vietnam

The EU approaches the issue with three tool layers: (1) the original defence duties on Chinese goods — typically the countervailing duties the European Commission imposed on battery electric vehicles imported from China after an anti-subsidy investigation, creating the economic incentive to shift assembly to third countries; (2) anti-circumvention investigations — where evidence shows assembly in a third country from parts of the dutied country to dodge duties, the EU may open an anti-circumvention investigation and extend the duties to goods shipped from that third country, with analysis focused on the share of parts from the dutied country and value added at assembly; (3) EVFTA preferential origin verification — EU customs and OLAF coordinate with Vietnamese authorities to verify preference-claimed shipments, and the Foreign Subsidies Regulation (FSR) allows the Commission to examine foreign subsidies distorting the internal market in defined transactions and activities.

What enterprises must understand is that these three layers are independent: a shipment may hold valid EVFTA origin (passing the preference verification layer) while the plant still sits in the sights of an anti-circumvention investigation if the parts structure shows a duty-dodging model; and conversely, goods not claiming EVFTA preference (sold at MFN duties) are investigated for circumvention just the same. The response dossier must therefore answer both question systems: the preferential origin questions (criteria by HS line, material documents) and the anti-circumvention questions (production substance, Chinese parts share, value added in Vietnam, timing and rationale of the plant investment).

Application Analysis

The EU investigation response dossier has four groups: origin files per shipment and per product (input C/Os of components, the EVFTA criterion worksheet on the exact HS line, supplier documents); production substance files (the detailed technological process of each stage in Vietnam, machinery lists and investment levels, technical personnel, actual output and capacity, production costs by component); parts structure files (the value share of parts by source country for each product model, and its evolution over time — investigators pay special attention to structure changes occurring right after duties on China were imposed); and the investment rationale file (the investment decision, market research, the non-duty factors for locating the plant in Vietnam such as the regional supply chain, labour, logistics and the ASEAN market).

The most important strategic decision lies in supply-chain design from the start: progressively raising the share of substantive production stages in Vietnam and the EVFTA region (cells, modules, constituent assemblies, embedded software and testing) instead of merely assembling kits; diversifying component sources so the share from one dutied country does not touch the anti-circumvention warning thresholds; and positioning products for several markets (ASEAN, domestic, other FTAs) so the plant does not look like a single-purpose transit station to the EU. An enterprise doing these three things well faces an investigation — if one occurs — as a procedure to pass through, not an existential risk.

Recommended Actions

Look up the EVFTA origin criterion on the exact HS line of each battery and EV product in the product-specific annex (via Circular 14/2026) and build the criterion worksheet on real data; never use word-of-mouth thresholds.
Analyse the production process against the EVFTA insufficient operations list: identify which Vietnam stages create substantial transformation and upgrade stages that are only simple assembly.
Build the four-group response dossier (origin, production substance, parts structure, investment rationale) and update it quarterly.
Redesign the supply chain toward more substantive stages in Vietnam and the region and diversified component sources, while diversifying output markets beyond the EU.

Frequently Asked Questions

Which EVFTA origin rules must Chinese enterprises assembling batteries and EVs in Vietnam satisfy?

Two rule layers: (1) the product-line criterion in the EVFTA product-specific rules annex — looked up by the HS code of batteries (heading 8507) or EVs (headings 8703, 8704) through the guidance in Circular 14/2026/TT-BCT; the criterion takes the form of a change in tariff classification, regional value content with a line-specific threshold, or a choice between the two; (2) the insufficient operations list — simple assembly from complete component kits, packing, labelling and testing do not confer origin even if a value ratio is met, so a plant merely assembling kits imported from China will not achieve EVFTA origin. Both layers must be satisfied simultaneously.

Under what mechanisms does the EU investigate EV and battery goods of Chinese origin routed through Vietnam?

Three independent mechanisms: anti-circumvention investigations — where evidence shows assembly in a third country from parts of a dutied country (such as Chinese EVs already under EU countervailing duties) to dodge duties, the EU opens an investigation and may extend duties to goods shipped from the third country, analysing parts share and value added at assembly; EVFTA preferential origin verification through Vietnamese authorities for preference-claimed shipments; and the Foreign Subsidies Regulation (FSR) allowing examination of foreign subsidies distorting the market in statutory cases. Holding EVFTA origin does not exempt from anti-circumvention investigation, and vice versa.

How much regional value content must be reached for goods to be recognised as of Vietnamese origin?

There is no single figure for batteries and EVs: the regional value content (RVC) threshold — where the line applies an RVC criterion — is set separately for each HS line in the EVFTA product-specific annex, and many lines allow origin to be achieved by a change in tariff classification instead of RVC. The enterprise must look up the exact HS line of its product (through the EVFTA annex and guiding Circular 14/2026/TT-BCT) to obtain its applicable threshold, then calculate on the product real value data. Applying one word-of-mouth ratio to every product is a wrong method and the source of many wrong origin certifications.

What response dossier should an enterprise prepare for an EU investigation?

Four file groups: origin — input C/Os of components, the EVFTA criterion worksheet on the exact HS line, supplier documents per shipment; production substance — the technological process of each stage in Vietnam, machinery and investment levels, technical personnel, actual capacity and output, production costs by component; parts structure — the value share of parts by source country for each product model and its evolution over time; and investment rationale — the investment decision, market research, the non-duty factors for locating the plant in Vietnam. The dossier must be built in advance and updated periodically, because once an investigation opens, questionnaire deadlines do not wait for the enterprise to gather historical data.