Cumulation — Application and Determination under EPA/FTA Rules of Origin
Interlink編集部What Is the Cumulation System?
The cumulation system is a mechanism under agreements such as EPAs and FTAs that allows materials and processing carried out in multiple agreement member countries to be included in determining the origin of the final product. In English, this system is generally referred to as cumulation or accumulation.
Normally, when a final product is produced using non-originating materials, the product must satisfy the applicable Product-Specific Rules of Origin, such as change in tariff classification, regional value content, or processing criteria. When the cumulation system applies, materials produced or certain processing performed in another member country may be treated as originating materials or domestic processing for origin determination purposes.
In modern supply chains, it is common for parts procurement, processing, assembly, inspection, and packaging to span multiple countries. Therefore, the cumulation system is an important framework for practical use of EPAs and FTAs.
However, the cumulation system is not a scheme under which any materials purchased from member countries can automatically be counted as originating materials. The materials and processing eligible for cumulation differ by agreement. It is necessary to confirm that the materials qualify as originating materials under the agreement, that the countries involved are member countries, and that required supporting documentation is retained.
Scope of This Article
This article addresses the cumulation system used in preferential rules of origin under EPAs and FTAs. It explains the purpose of the system, main types of cumulation, practical points under CPTPP and RCEP, the relationship with CTC, RVC, and de minimis rules, supplier declarations, consecutive certificates of origin, shipment criteria, and the scope of freight forwarders’ involvement.
| Item | Content Covered in This Article | Content Covered in Other Articles in Detail |
|---|---|---|
| Basics of the Cumulation System | Covers the concept of including originating materials or processing done in multiple contracting countries in origin determination. | The overall structure of preferential origin rules is covered in “What Are Preferential Origin Rules?” |
| Bilateral Cumulation | Outlines cases within bilateral EPAs and FTAs where materials originating in the partner country can be treated as domestic originating materials. | Details of each bilateral EPA are covered in agreement-specific articles. |
| Multilateral Cumulation | Addresses situations in multilateral agreements such as CPTPP and RCEP where originating materials or processing from multiple contracting countries are used. | The overall systems of CPTPP and RCEP are covered in their respective agreement-specific articles. |
| Diagonal and Full Cumulation | Organizes the concepts, application scenarios, and practical limitations of diagonal and full cumulation. | Details of specific regional agreements and European-style origin rules are covered in separate system articles. |
| Relationship with CTC and RVC | Discusses the impact on CTC determination and RVC calculation when cumulation-eligible materials can be treated as originating materials. | Change in tariff classification and regional value content are covered in specialized articles. |
| Relationship with De Minimis Rules | Examines the review process for de minimis rules when non-originating materials remain that cannot be covered by cumulation. | Requirements and calculation methods for de minimis rules are covered in separate articles. |
| Relationship with Shipment Criteria | Deals with the need to separately confirm transportation route requirements even when origin criteria are met through cumulation. | Transit through third countries, non-processing evidence, and transport route verification are covered in “What Are Shipment Criteria?” |
| Supplier Declaration | Covers how to interpret documents confirming the origin of cumulation-eligible materials. | Practices for creating and retaining supplier declarations are handled in separate articles. |
| Scope of Freight Forwarders’ Involvement | Addresses the extent to which freight forwarders can support the organization of transport documents and shipment criteria checks, and areas where they should not conclusively decide origin determinations. | Responsibility allocations among importers, exporters, producers, and customs brokers are covered in origin certification-related articles. |
Purpose and Background of the System
The purpose of the cumulation system is to appropriately reflect the procurement of materials and processing conducted between agreement member countries in determining the origin of the final product. With the progress of international division of labor, it is now rare for all materials and processes of a finished product to be completed within a single country; it is common to use parts and intermediate goods produced in multiple agreement member countries.
For example, if a qualifying part produced in one RCEP member country is assembled in another RCEP member country and exported to Japan, treating that part simply as non-originating material could put the product at a disadvantage in origin determination, despite substantial production activities occurring within the agreement area. The cumulation system evaluates such production activities within the agreement area under certain conditions.
On the other hand, if the cumulation system is applied too broadly, there is a risk that materials from third countries outside the agreement could be treated as originating within the agreement area. Therefore, the cumulation system requires strict verification of the countries involved, applicable agreements, materials and processes concerned, supporting documentation, and record-keeping obligations.
Situations Where the Cumulation System Applies
The cumulation system is not automatically applicable simply because materials are sourced from multiple countries. It may be used within the origin determination process if the relevant materials and processes meet the requirements set by the agreement between the contracting parties of the applicable EPA or FTA.
| Application Scenario | Common Issues | Documents to Check | Practical Actions |
|---|---|---|---|
| Using originating materials from one contracting party in another contracting party | Even if materials come from a contracting party, whether they qualify as originating materials under the agreement is a separate issue. | Certificate of Origin, origin declaration, supplier declaration | Confirm that the materials qualify as originating under the relevant agreement. |
| Processing or assembly performed in multiple contracting parties | It is a challenge to determine which country’s processes can be included in the origin determination. | Process charts, subcontracting documentation, manufacturing records | Check the range of cumulation recognized by the agreement. |
| Increasing the value of originating materials in RVC calculation | Treating cumulation-eligible materials as originating affects the RVC ratio. | Material cost data, RVC calculation sheets, supplier declaration | Keep both material costs and origin justification together as documentation. |
| Clarifying non-originating materials in CTC determination | Treating cumulation-eligible materials as originating may exclude them from the CTC scope. | Material HS codes, material lists, origin-related documents | Clearly distinguish between originating and non-originating materials. |
| Using multilateral agreements such as CPTPP or RCEP | Whether cumulation applies across supply chains spanning multiple contracting parties can be problematic. | Relevant agreements, list of contracting parties, origin documentation | Verify the cumulation provisions specific to each agreement. |
| When re-export or consecutive certificates of origin are involved under RCEP | The cumulation system, origin determination, consecutive certificates of origin, and shipment criteria can easily become confused. | Certificates of Origin, consecutive certification documents, transport documents | Separate and organize each issue clearly. |
| Considering diagonal cumulation | In Japanese EPA practice, its application is limited and requires thorough confirmation of the relevant agreement. | Applicable agreements, target countries, cumulation rules, certification methods | Avoid assuming the same conditions as for general cumulation. |
| Using some non-contracting party materials | Non-contracting party materials are excluded from cumulation and require separate checks under CTC, RVC, or de minimis rules. | List of non-originating materials, cost data, HS code references | Separate cumulation-eligible materials from non-contracting party materials. |
Common Misunderstandings
The cumulation system often leads to misunderstandings such as “materials purchased from a partner country can automatically be treated as originating materials” or “using the cumulation system resolves all origin issues.” The cumulation system is meant to assist origin determination and does not eliminate the need to verify origin documentation, Product-Specific Rules of Origin, or shipment criteria.
| Common Misunderstanding | Actual Consideration | Practical Points to Note |
|---|---|---|
| Materials purchased from a partner country automatically qualify as originating materials | Simply buying from a partner country is not sufficient. It must be confirmed that the material itself meets the originating material criteria under the relevant agreement. | Verify supplier declarations, origin declarations, or certificates of origin. |
| The cumulation system can be applied the same way in all agreements | The scope of cumulation, eligible countries, qualifying materials, and certification methods differ for each agreement. | Do not apply methods used under other agreements without confirmation. |
| Using the cumulation system eliminates the need to verify origin | The cumulation system aids origin determination, but Product-Specific Rules of Origin, CTC, RVC, and shipment criteria still need to be checked. | Also verify non-originating materials and transportation routes outside the cumulation-eligible materials. |
| Diagonal cumulation is widely applicable in Japanese EPAs | Diagonal cumulation involves complex system design and is limited to certain agreements and regions. | Individually confirm applicable agreements, countries, and certification methods. |
| If a supplier declaration exists, its contents do not need to be checked | Supplier declarations are important documents, but it is necessary to confirm the relevant agreement, applicable products, period of validity, and material scope. | Avoid mistakenly using declarations intended for other agreements or periods outside the validity range. |
| All materials purchased from RCEP member countries automatically qualify as RCEP originating materials | Even when purchased from an RCEP partner country, documentation proving the material meets RCEP originating criteria is required. | Check certificates of origin, origin declarations, and supplier declarations. |
| The cumulation system and consecutive certificates of origin are the same system | The cumulation system involves incorporating materials or processes from other partner countries into origin determination, whereas consecutive certificates of origin relate to proof connections for re-exportation. | Since both may be involved in the same transaction under RCEP, the issues should be separated and clearly organized. |
| Materials not covered by the cumulation system can be ignored | Materials excluded from cumulation must be separately verified as non-originating materials under CTC, RVC, de minimis rules, or other origin criteria. | List and manage materials from non-partner countries or with insufficient certification. |
Main Types of Cumulation Rules
Cumulation rules come in several types, depending on the design of the agreement. The typical ones are bilateral cumulation, multilateral cumulation, diagonal cumulation, and full cumulation. Although their names are similar, they differ in the countries involved, materials covered, production processes, and required documentation.
| Type | Target Countries | Applicable Situations | Points to Note | Relevant Agreements / Regions in Practice |
|---|---|---|---|---|
| Bilateral Cumulation | Between contracting parties of bilateral EPAs or FTAs | When materials originating in the partner country are treated as originating materials of the home country. | It is necessary to confirm that the materials qualify as originating in the partner country. | Bilateral EPAs / FTAs |
| Multilateral Cumulation | Between contracting parties of an agreement involving multiple countries | When materials or processing spanning multiple contracting countries is incorporated into origin determination. | Each material must be verified as originating under the applicable agreement. | CPTPP, RCEP, and similar agreements |
| Diagonal Cumulation | Between countries or regions linked through multiple agreements | When materials or processing originating in a third country with certain agreement ties can be cumulatively considered. | The system design is complex, and not all agreements permit this. | Some regional agreements and European-style origin rules |
| Full Cumulation | Between contracting parties recognized in the agreement | When not only originating materials but also parts of the production or processing steps can be included in the cumulation. | It is necessary to verify which processing steps can be cumulatively counted and check supporting documents. | Requires confirmation according to each agreement’s provisions |
Bilateral Cumulation
Bilateral cumulation is a mechanism in bilateral EPAs and FTAs that allows materials originating from the partner country to be treated as originating materials in one’s own country. For example, under an EPA between Japan and a partner country, materials originating in the partner country and processed in Japan may be considered originating materials.
However, even if the materials are imported from the partner country, they cannot be treated as cumulation-eligible materials unless it can be confirmed that those materials themselves qualify as originating materials under the relevant EPA. The issue concerns the agreed rules of origin under the agreement, not merely the country of purchase or shipment.
Multilateral Cumulation
Multilateral cumulation refers to a system within agreements involving multiple contracting countries, where materials and processing from multiple countries can be accumulated. In agreements with multiple participating countries such as RCEP and CPTPP, the cumulation system is important in supply chains spanning several contracting countries.
Under multilateral cumulation, even materials procured from participating countries will not qualify for cumulation unless it can be demonstrated that those materials themselves meet the agreement’s origin criteria. The relevant agreement, material origin status, certification method, and record keeping should be checked as an integrated process.
Diagonal Cumulation
Diagonal cumulation is a system that allows materials or processing from third countries to be cumulated under certain conditions among multiple countries or regions that have agreement relations. In theory, cumulation linking multiple agreements beyond a bilateral relationship may become an issue.
However, diagonal cumulation involves complex system design and is not recognized under all agreements. In practical EPA operations in Japan, multilateral cumulation such as under RCEP is more commonly encountered, and the application of diagonal cumulation is limited.
When considering diagonal cumulation, it is necessary to individually verify the applicable countries, relevant agreements, materials or processes subject to cumulation, required certificates of origin, and conditions for mutual application.
Full Cumulation
Full cumulation is a concept recognized under trade agreements that allows not only materials but also certain processing steps or production activities carried out in agreement countries to be included in origin determination. It is not enough to simply check whether the materials are originating; where and how the processing took place becomes crucial.
Whether full cumulation is permitted, which processes can be cumulated, and the documentation required as proof vary depending on the specific agreement. It is necessary to review process flow charts, manufacturing records, subcontracting records, and supplier documentation, and to handle this not merely as a concept but as a concrete requirement stipulated by each agreement.
Comparison of the Cumulation System in CPTPP and RCEP
Both CPTPP and RCEP are agreements involving multiple countries, and the cumulation system is relevant to rules of origin determination. However, there are practical differences in certification methods, the scope of the supply chain, country of origin identification, and the relationship with consecutive certificates of origin.
| Comparison Item | CPTPP | RCEP | Common Points to Note | Practical Measures |
|---|---|---|---|---|
| Basic Cumulation | Originating materials produced within CPTPP member countries may be incorporated into origin determination in other member countries. | Originating materials and processing done within RCEP member countries may be incorporated as broad cumulation. | Purchases solely from member countries are insufficient; the materials must meet the originating material criteria under the agreement. | Confirm the origin documentation under the relevant agreement for each material. |
| Certification Method | Primarily based on self-declaration, with the declarant retaining the origin documentation. | Includes third-party certification, declarations by authorized exporters, and self-declaration. | Avoid confusing the certification method with the cumulation system itself. | Check the certification method by agreement, country, and timing. |
| Country of Origin Identification | Confirm whether the materials are originating under CPTPP. | Under RCEP, identifying the country of origin may raise additional issues. | Separate confirmation of originating materials from country of origin marking and tariff classification. | Keep origin documentation and country of origin identification documents separately. |
| Consecutive Certificates of Origin | Mainly concerns retention of self-declaration documents and transport documents. | Consecutive certificates of origin issues may arise in re-export via intermediate member countries. | The cumulation system and consecutive certificates of origin are distinct concepts. | Organize material procurement, processing, re-export, and transport routes separately. |
| Relationship with Shipment Criteria | Even if origin is met by cumulation, verify non-processing or custody conditions during transit through third countries. | Check handling during transport routes and transit points, even when passing through multiple member countries. | Origin rules and shipment criteria are separate matters to verify. | Check B/L, Sea Waybill, transit documents, and bonded control records. |
RCEP and Consecutive Certificates of Origin
Under RCEP, when cargo is traded through multiple contracting parties, consecutive certificates of origin can become an issue. This refers to the challenge of proving the continuity of originating status when goods are exported from the initial exporting country based on a certificate of origin, then transported through an intermediate contracting party before being exported to another contracting party.
The cumulation system and consecutive certificates of origin are not the same. The cumulation system incorporates materials and processing into origin determination. Consecutive certificates of origin are a mechanism used to maintain proof of originating status in transactions involving re-exports or shipments via intermediate contracting parties.
| Check Item | Details to Confirm | Points of Caution | Practical Measures |
|---|---|---|---|
| Initial Certificate of Origin | Whether the materials or goods qualify as originating under RCEP. | Confirm the scope of goods covered by the certificate of origin or origin declaration. | Cross-check the relevant product items, quantities, HS codes, and country of origin. |
| Handling in Intermediate Contracting Party | Whether there is re-export, storage, splitting, transshipment, or processing. | Verify that none of these handling methods cause loss of originating status. | Review warehouse records, transport documents, and handling records. |
| Consecutive Certification Documents | Documents that link the originating status from the intermediate contracting party to the subsequent importing country. | Confirm the operating practices and certification methods for each country involved. | Coordinate among importer, exporter, and customs broker to verify required documentation. |
| Shipment Criteria | Transport route and control status during transit via third countries. | Check bonded control, absence of processing, and transport documents. | Keep transport route documents and certificates of origin records separately. |
Application Requirements and Exclusions
To utilize the cumulation system, all elements including the applicable agreement, eligible countries, qualifying materials, supporting documentation, and relationship to the origin criteria must be consistent. Even if materials are procured from a contracting party, they may not be considered cumulation-eligible without proper certification.
| Category | Application Requirements | Exclusions / Common Issues | Practical Response |
|---|---|---|---|
| Applicable Agreement | The EPA or FTA in use must recognize the cumulation system. | Attempting to apply cumulation rules under agreements lacking them or with restricted cumulation scope. | Verify the cumulation provisions in the applicable agreement. |
| Eligible Countries | Materials or processing must be performed in contracting countries under the agreement. | Attempting to include materials or processing from non-contracting countries as cumulation-eligible. | Clarify the sourcing country, processing country, and exporting country. |
| Qualifying Materials | The materials themselves must qualify as originating materials under the agreement. | Purchasing from a contracting party without origin certification. | Check supplier declarations, origin declarations, and certificates of origin. |
| Qualifying Processing | The agreement must allow processing performed in other contracting parties to be included in cumulation. | Mistakenly considering all outsourced or minor processing as cumulation-eligible. | Review process charts, subcontracting records, and the cumulation scope defined in the agreement. |
| Relationship with CTC | When using cumulation-eligible materials as originating materials, correctly identify the scope of non-originating materials. | Treating uncertified materials as originating and applying CTC determination. | Organize HS codes and origin status for each material. |
| Relationship with RVC | The value of cumulation-eligible materials can be reflected as regional originating materials for RVC calculation. | Including materials lacking valuation or origin documents in the RVC calculation. | Retain material values, FOB prices, and calculation bases. |
| Relationship with De Minimis | For non-originating materials that cannot be organized under the cumulation system, consider the scope allowed under the agreement’s de minimis rules. | Confusing cumulation rules and de minimis as the same system. | Delineate cumulation-eligible materials separately from de minimis materials. |
| Shipment Criteria | Goods qualifying as originating must not lose their originating status during transportation. | Fulfilling origin under cumulation rules but being unable to explain processing or non-bonded storage during transit through third countries. | Check transport documents, transit country records, and non-processing evidence. |
Comparison with Other Systems
The cumulation system is designed to assist in origin determination. Its role differs from that of CTC, RVC, processing criteria, de minimis rules, and shipment criteria. In practice, it is important not to confuse these systems as a single one but to separate and organize their respective verification targets.
| System / Criteria | Verification Target | Relationship with Cumulation System | Documents for Verification | Notes |
|---|---|---|---|---|
| CTC | Whether the HS codes of non-originating materials and the finished product have changed to the required level under the agreement. | If the cumulation-eligible materials can be treated as originating materials, they may be excluded from CTC evaluation. | Material HS codes, material lists, supplier declarations, origin documentation | Materials that cannot be proven must be treated as non-originating. |
| RVC | Whether the value added within the agreement area in the finished product meets the required threshold. | If the cumulation-eligible materials can be treated as regional originating materials, it may be easier to meet the RVC ratio. | Material values, FOB prices, RVC calculation documents, supplier declarations | Records supporting value and origin need to be retained. |
| Processing Criteria | Whether the required processing operations under the agreement have been performed. | If recognized by the agreement, processing done in other contracting countries may be reflected in origin determination. | Process charts, production records, subcontract processing documents, supplier information | Not all processing can be recognized through cumulation. |
| De Minimis Rules | If some non-originating materials fail the CTC requirement, whether relief can be applied within a certain range. | If there are materials that cannot be considered originating through cumulation rules, they are reviewed separately under this system. | Value and weight of non-originating materials, calculation basis documents | Cumulation and de minimis are separate systems. |
| Shipment Criteria | Whether the originating goods have retained their qualification during transportation. | Even if origin is satisfied through cumulation rules, confirmation of transport routes is required separately. | B/L, Sea Waybill, Air Waybill, transit documentation, bonded control documents | Origin and transport requirements are verified separately. |
| Origin Certification Method | Which method is used to prove the goods’ origin. | Even when using cumulation rules, the certification method prescribed by the agreement must be followed. | Certificates of origin, origin declarations, origin declaration statements | Do not confuse certification methods with the cumulation system. |
How to Confirm Materials Eligible for Cumulation
To use the cumulation system, it is necessary to confirm that the relevant materials and parts qualify as originating materials under the agreement. Simply purchasing materials from an agreement country is not sufficient. Documentation must be available to demonstrate that the materials themselves meet the origin criteria of the applicable agreement.
Supplier declarations are important documents, but having them alone is not enough. The issuer, applicable agreement, relevant materials, covered period, grounds for origin, and record-keeping methods should all be verified to ensure they correspond with the actual transaction.
| Verification Item | Details to Confirm | Main Verifiers | Practical Notes |
|---|---|---|---|
| Issuer | Who is certifying the origin of the materials, such as the supplier, producer, or exporter. | Exporter, importer, producer | Sometimes the seller is only a reseller without full knowledge of origin. |
| Applicable Agreement | Which EPA or FTA the origin certification is based on. | Exporter, origin compliance officer | Avoid reusing certificates intended for a different agreement. |
| Relevant Materials | Product name, item number, HS code, quantity, and applicable period. | Producer, exporter | Check that they match the materials actually used. |
| Basis of Origin | Reason why the materials qualify as originating, such as CTC, RVC, or processing criteria. | Producer, supplier | Confirm whether supporting documents may be submitted if required. |
| Validity Period | The period during which the certificate or declaration applies to transactions. | Exporter, importer | Ensure materials outside this period are not covered by mistake. |
| Record-Keeping | Which documents to retain for customs verification. | Exporter, importer, producer | Store together with the final product’s origin documentation. |
Application Flow of the Cumulation System
The cumulation system is not something to be checked only immediately before import declaration. It should be managed throughout the entire process, from selecting suppliers, purchasing materials, manufacturing, origin determination, certificate issuance, transportation arrangement, import declaration, to subsequent customs verification.
| Step | Check Items | Main Parties Involved | Decision to Proceed |
|---|---|---|---|
| 1 | Confirm the applicable agreement, such as an EPA, FTA, CPTPP, or RCEP. | Importer, exporter, customs broker | Verify the cumulation provisions in the relevant agreement. |
| 2 | Check the HS code of the target cargo. | Importer, exporter, customs broker | Proceed to verify Product-Specific Rules of Origin. |
| 3 | Confirm the Product-Specific Rules of Origin for the target cargo. | Importer, exporter, producer | Organize which criteria apply: CTC, RVC, or processing criteria. |
| 4 | Confirm whether the agreement allows use of the cumulation system. | Importer, exporter, origin management officer | If cumulation is not applicable, proceed with standard origin criteria judgment. |
| 5 | Confirm the type of cumulation and the countries involved. | Exporter, producer, procurement officer | Organize whether it falls under bilateral cumulation, multilateral cumulation, diagonal cumulation, or full cumulation. |
| 6 | Classify materials into originating materials, cumulation-eligible materials, and non-originating materials. | Producer, exporter | Confirm the premise that materials without proof will be treated as non-originating materials. |
| 7 | Verify documentation proving the origin of cumulation-eligible materials. | Exporter, producer, supplier | Obtain and retain supplier declarations or origin declarations. |
| 8 | Clarify the relationship between CTC, RVC, processing criteria, and de minimis provisions. | Exporter, producer, importer | Prepare origin determination tables and RVC calculation sheets. |
| 9 | Check compliance with shipment criteria. | Importer, exporter, freight forwarder, customs broker | Verify transportation routes and transit documentation. |
| 10 | Preserve documents for customs verification. | Importer, exporter, producer | Keep a complete set of material documents, process records, certificates, and transportation papers. |
Four-Column Judgment Checklist
When using the cumulation system, it is essential to determine who to confirm with, what to confirm, at which stage, and how to respond if issues arise. It is important to manage this not simply as a document retention list but as a workflow for judgment and response.
| Check Timing | Party to Confirm With | Matters to Confirm | Response If Issues Arise |
|---|---|---|---|
| At the Start of Transactions | Importer, exporter, sales representative | Applicable agreement, target countries, existence of preferential tariff rates, supply chain. | If the applicable agreement is unclear, organize HS codes, exporting country, and importing country. |
| When Confirming Procurement Sources | Exporter, manufacturer, purchasing officer | Country of material purchase, supplier, whether materials qualify as originating materials under the applicable agreement. | Do not judge solely based on purchase from contracting countries; request origin documentation from suppliers. |
| When Confirming Material Origin | Manufacturer, exporter, supplier | Whether the materials qualify as originating materials under the applicable agreement. | If supplier declarations or origin declarations are absent, reclassify as non-originating materials. |
| When Determining Origin | Manufacturer, exporter, importer | CTC, RVC, processing criteria, cumulation rules, de minimis provisions. | Materials that cannot be explained through cumulation rules should be separately checked under CTC, RVC, or de minimis provisions. |
| When Preparing Certificates | Exporter, manufacturer, declarant | Consistency between materials using cumulation rules and the certificate content. | Correct any discrepancy in the applicable agreement, products, or validity period on the certificate. |
| When Handling RCEP Transactions | Exporter, importer, customs broker | Broad cumulation, identification of country of origin, consecutive certificates of origin, shipment criteria. | Document the cumulation system and consecutive certificates of origin separately. |
| When Arranging Transportation | Exporter, importer, freight forwarder | Shipment criteria, transit through third countries, transshipment, and treatment at transit points. | If there is transit via a third country, verify transportation documents and bonded control materials. |
| At Import Declaration | Importer, customs broker | Ability to explain origin based on the cumulation system. | If documentation is insufficient, carefully assess the eligibility for preferential tariff rates. |
| During Customs Post-Verification | Importer, exporter, manufacturer | Origin of cumulation-eligible materials, material values, processes, certification documents, transportation routes. | Submit retained documents and request additional verification from suppliers or manufacturers if documents are lacking. |
Key Documents
Under the cumulation system, it is necessary to retain not only the certificate for the final product but also origin-related documents for each material, process data, value information, and transportation records. Especially when using RVC calculations or supplier declarations, systematic management of supporting documents is required to prepare for future customs verification.
| Documents / Materials | Purpose of Verification | Main Holders | Practical Notes |
|---|---|---|---|
| Certificate of Origin | To verify the origin of cumulation-eligible materials and the final product. | Exporter, importer, issuing authority | Check applicable agreements, subject items, quantities, and validity periods. |
| Origin Declaration | Used in self-declaration systems to indicate origin of materials or final products. | Exporter, importer, producer | Confirm the declarant and mandatory information to be included. |
| Supplier Declaration | To confirm the origin of materials or parts. | Supplier, producer, exporter | Verify applicable agreements, subject items, and validity periods. |
| Material List / Parts List | To categorize materials into originating and non-originating. | Producer, exporter | Ensure consistency with materials actually used in production. |
| Classification Documents for Originating and Non-Originating Materials | To determine cumulation-eligible materials. | Producer, exporter, origin management officer | Exclude materials that cannot be substantiated as originating. |
| Verification Documents for Product-Specific Rules of Origin | To confirm the origin criteria required for the subject goods. | Exporter, importer, customs broker | Be aware that PSRs differ depending on each agreement. |
| HS Code Verification Documents | To verify classification of final products and materials. | Exporter, importer, customs broker | Mistakes in HS codes can lead to incorrect origin determinations. |
| RVC Calculation Documents | To reflect cumulation-eligible materials as regional originating materials in calculations. | Producer, exporter, importer | Retain FOB prices, material values, and calculation formulas. |
| Supporting Documents for Using De Minimis Provisions | To verify non-originating materials that cannot be organized under cumulation. | Producer, exporter, importer | Confirm agreement limits, values, and weights. |
| Manufacturing Process Chart | To verify which processes were performed in which countries. | Producer, exporter | Confirm subcontracted processes and intermediate process locations as well. |
| Invoice / Packing List | To verify cargo contents, quantities, prices, and transaction details. | Exporter, importer | Check consistency of product names and quantities against certification documents. |
| B/L, Sea Waybill, Air Waybill | To verify transportation routes and shipment criteria. | Freight forwarder, shipping line, airline, importer | Additional documents may be required when transit through third countries occurs. |
| Documents to Retain for Customs Verification | To explain origin determination made using the cumulation system at a later customs check. | Importer, exporter, producer | Retain a complete set of materials covering materials, processes, values, certifications, and transportation. |
Common Practical Issues
Under the cumulation system, not only the origin of the materials but also which agreement the materials originate from, which documents can prove this, and how it relates to CTC, RVC, and de minimis rules become critical issues.
| Case | Potential Issues | Documents to Verify | Practical Notes |
|---|---|---|---|
| Using broad cumulation under RCEP | When RCEP-origin parts produced in Thailand are processed in Vietnam and imported into Japan, the origin of the parts and whether cumulation is applicable are key issues. | Certificate of Origin for parts, origin declaration, supplier declaration, shipment criteria documents | Confirm not only that the goods were sourced from RCEP countries but also that they qualify as RCEP-origin materials. |
| Using cumulation under CPTPP | When originating materials produced in a CPTPP member country are used in another CPTPP member country, retention of self-declaration documents is an issue. | Origin declaration, supplier declaration, material list, process chart | Keep supporting documents that allow the declaring party to explain the origin. |
| Using cumulation-eligible materials for RVC | Whether cumulation-eligible materials counted as originating within the region satisfy RVC criteria is a potential issue. | Material costs, RVC calculation sheet, origin documentation, supplier declaration | Retain both cost and origin evidence together. |
| Using cumulation-eligible materials for CTC | Check whether materials originating from contracting countries can be excluded from non-originating materials to determine CTC compliance. | Material HS codes, certificates of origin, material list | Materials without proof are treated as non-originating materials. |
| Cases combining with de minimis rule | For some materials that cannot be treated as originating under cumulation, whether they can be accounted for under the de minimis rule is an issue. | Value and weight of non-originating materials, applicable product items, agreement thresholds | Avoid confusing cumulation rules with de minimis provisions. |
| Considering diagonal cumulation | Whether materials originating in a third country can be cumulated among countries or regions under multiple agreements is the main issue. | Applicable agreements, countries involved, cumulation-eligible materials, proof methods | Since this is limited in Japanese EPA practice, case-by-case confirmation is necessary. |
| Insufficient supplier declarations | Although materials are purchased from contracting countries, evidence proving the materials are originating is missing. | Supplier declarations, origin declarations, origin supporting documents for materials | Materials lacking documentation might be reclassified as non-originating materials. |
| Mixed materials from non-contracting countries | Some materials originate from non-contracting countries, requiring separate verification under CTC or RVC as outside the cumulation scope. | List of non-originating materials, HS codes, value data, de minimis calculation documents | Clearly separate cumulation-eligible materials from non-contracting country materials. |
| Insufficient shipment criteria documentation | Even if the origin criteria are met under the cumulation system, lack of transport route or third-country transit documentation may be problematic. | B/L, Sea Waybill, transit documents, bonded control documents, non-processing certificates | Check origin documentation and transport documents separately. |
Application Scenarios of the System
This section organizes situations where the cumulation system tends to cause particular issues into distinct scenarios. It reviews the decision-making order, which can be hard to grasp from tables alone, following the practical workflow.
Scenario 1: Using Multilateral Cumulation under RCEP
In a transaction where parts produced in Thailand are processed and assembled in Vietnam and the finished products are imported into Japan, multilateral cumulation under RCEP becomes an issue. In this case, it is not enough that Thailand, Vietnam, and Japan are RCEP member countries. It is necessary to confirm that the parts produced in Thailand qualify as originating materials under RCEP.
If it can be confirmed that the parts are RCEP originating materials, there is a possibility that these parts can be treated as cumulation-eligible materials in the origin determination in Vietnam. On the other hand, even if the parts are shipped from Thailand, if they in fact consist of non-member country materials and cannot be demonstrated as originating materials under RCEP, they cannot be treated as cumulation-eligible materials.
In practice, certificates of origin, origin declarations, supplier declarations, material lists, and process sheets are checked for each part. Additionally, upon import into Japan, identifying the RCEP country of origin, verifying consecutive certificates of origin, and checking shipment criteria are separate issues.
Scenario 2: Misunderstanding the Use of Diagonal Cumulation
When multiple countries or regions each have EPAs with Japan, there can be a misunderstanding that materials originating from a third country may broadly be cumulated. This is the issue with diagonal cumulation. However, diagonal cumulation has a complex system design and is not automatically available under all EPAs.
In Japanese EPA practice, there are occasions where multilateral cumulation such as RCEP or CPTPP causes issues, but the use of diagonal cumulation is limited. Simply having multiple agreements among target countries is insufficient; the applicable agreement must explicitly permit diagonal cumulation and meet the necessary rules on certificates of origin and mutual application conditions.
In practice, before proceeding with origin determination based on diagonal cumulation, the target agreements, countries, cumulation-eligible materials, certification methods, and customs operational practices of the importing country should be confirmed. When confirmation is not possible, materials should be reassessed as non-originating materials using CTC, RVC, or de minimis rules.
Scenario 3: Distinguishing Non-Member Country Materials from Cumulation-Eligible Materials
The materials of a finished product may include originating materials from member countries, materials purchased from member countries but lacking proven origin, and materials from non-member countries mixed together. Treating all materials identically in this case can lead to erroneous origin determination.
The materials that can be treated as cumulation-eligible are those confirmed as originating materials under the relevant agreement. Materials merely purchased from member countries or lacking supplier declarations must be classified as non-originating materials. Non-member country materials are generally excluded from cumulation.
In practice, a material list is prepared to classify materials into originating materials, cumulation-eligible materials, non-originating materials, and materials with insufficient certification. Then, it is determined which materials remain as non-originating under CTC criteria, which values can be treated as regional originating materials under RVC calculations, and whether any materials qualify under de minimis provisions.
Scenario 4: Treating Cumulation-Eligible Materials as Regional Originating Materials in RVC Calculations
In origin determination using RVC, the value added within the agreement region in the finished product’s price is calculated to see if it meets the threshold. When the cumulation system can be used, originating materials produced in other member countries can be treated as regional originating materials, which may make it easier to meet the RVC ratio.
However, to reflect this in the RVC calculation, documentation demonstrating the value and originating status of the cumulation-eligible materials is required. The fact that materials were purchased from a member country alone is not sufficient. It is necessary to retain material values, FOB prices, non-originating material values, supplier declarations, and origin documentation.
In practice, the RVC calculation sheet should clearly specify which materials were treated as regional originating materials and which were treated as non-originating materials. To prepare for customs verification, it is important to keep not only the calculation formulas but also supporting documents for each material.
Scope of Freight Forwarders' Involvement
Freight forwarders are not the responsible parties for deciding whether the cumulation system applies or for determining origin qualifications themselves. Judgments regarding the cumulation system require information on material origin, manufacturing processes, RVC calculations, supplier declarations, and Product-Specific Rules of Origin, which should be managed by importers, exporters, and producers.
On the other hand, freight forwarders may assist in organizing shipment documents such as invoices, packing lists, B/Ls, Sea Waybills, and Air Waybills, and in verifying transport routes and shipment criteria. For RCEP transactions, they may also prompt verification of transit countries, re-exports, and consecutive origin certifications.
| Category | Supportable Tasks | Tasks Not to Decide | Operational Practice |
|---|---|---|---|
| Shipment Document Consistency | Check consistency among invoice, packing list, B/L, and Sea Waybill entries. | Make final judgment on applicability of the cumulation system. | Verify consistency of product names, quantities, shippers, consignees, and origin documents. |
| Transport Route | Organize information on shipment criteria, third-country transit, and presence of transshipment. | Legally determine whether shipment criteria under the agreement are met. | Compile transport documents and transit-related materials and share them with the customs broker. |
| Guidance on Required Documents | Encourage shippers to verify certificates of origin, origin declarations, and supplier declarations. | Guarantee that materials are originating materials. | Prompt exporters and producers to confirm documents necessary for origin determination. |
| RCEP Transactions | Encourage verification of transit countries, re-exports, and consecutive origin certifications. | Make definitive judgments on countries of origin or cumulation eligibility under RCEP. | Advise parties to verify country of origin, cumulation rules, consecutive certification, and shipment criteria separately. |
| Preparation for Customs Confirmation | Organize transport documents and shipment-related materials. | Judge fulfillment of CTC, RVC, or de minimis rules. | Organize transport documents; origin-related documents should be checked by the shipper and customs broker. |
| Schedule Management | Organize timing for certificate acquisition, shipment, and planned import declaration. | Guarantee that certificates of origin and origin declarations will always be accepted. | If documents are missing, share this information promptly with relevant parties before customs clearance. |
Important Points
When using cumulation rules, it is important to note that the details and applicable countries vary depending on each agreement. Bilateral cumulation, multilateral cumulation, diagonal cumulation, and full cumulation each differ in terms of applicable countries, materials, and processes.
Materials sourced from contracting countries do not automatically qualify as originating materials. It is necessary to verify the relevant agreement, applicable products, and time periods for the origin documentation, supplier declarations, origin declarations, and certificates of origin related to cumulation-eligible materials.
When used for RVC calculation, records supporting the value of materials and origin must be retained. For CTC determination, it is critical to identify which materials are treated as non-originating. For non-originating materials that cannot be addressed through cumulation, the availability of de minimis provisions may need to be separately confirmed.
Additionally, even if origin criteria are met under the cumulation system, failure to meet shipment criteria could affect the application of preferential tariffs. It is important to separately manage verification of origin and verification of transport routes.
Summary
The cumulation system allows materials and processing originating from multiple contracting countries to be incorporated into the origin determination of the final product. There are different types, including bilateral cumulation, multilateral cumulation, diagonal cumulation, and full cumulation, and each agreement, such as CPTPP and RCEP, handles them differently.
In practice, it is necessary to confirm not only that the materials come from contracting countries but also that those materials qualify as originating materials under the relevant agreement. It is important to retain supplier declarations, origin declarations, certificates of origin, material lists, process charts, and RVC calculation documents.
The cumulation system is verified in combination with CTC, RVC, processing criteria, de minimis rules, and shipment criteria. Distinguishing between materials that can be accounted for through cumulation and those that should be separately verified as non-originating is key to accurate origin determination.
In broad agreements such as RCEP, confirmation is needed not only of the cumulation system but also of consecutive certificates of origin, specific country of origin, and shipment criteria.
