I. Statutory Documents
What constitutes statutory documents?
Based on export declaration practices, the documents are categorized as follows: Eight Items—Consignors/consignees of import/export goods and commissioned customs declaration enterprises must submit the following accompanying documents to Customs (unless exempted by regulation): 1. Contract, 2. Invoice, 3. Packing list, 4. Cargo manifest, 5. Bill of lading/transport document, 6. Letter of authorization for customs declaration, 7. Import/export licenses/permits, 8. Other documents required by laws and regulations (Article 8 of GACC Decree No. 277); Handbook—Processing trade handbook (paper or electronic) required by Customs and other import/export-related documents (Article 27 of the Declaration Management Provisions, Attachment 5 of the Ministry of Commerce regulations); Accompanying Documents—Documents required to accompany the import/export declaration form include the contract, invoice, packing list, cargo manifest, bill of lading, letter of authorization, licenses/permits, and other documents specified by the General Administration of Customs; Licenses/Permits—Required import/export licenses and accompanying documents; Understanding Relationships—Customs declaration enterprises must ascertain from their clients whether a related-party relationship exists between the buyer and seller; Six-Copy Set—Paper export declaration forms in six copies (Customs processing copy, Customs retention copy, enterprise retention copy, Customs verification/write-off copy, etc.). Summary of the six statutory requirements: the eight accompanying items, processing trade handbook, declaration attachments, licenses/permits, verification of related-party relationships, and the six-copy declaration form set.
II.
Commercial Documents
What to look for in commercial documents: Based on export customs declaration practices, documents are reviewed as follows: Complete Set—Exporters must apply for customs declaration when goods leave the country (filling out the export goods declaration form and submitting relevant documents such as contracts, letters of credit, invoices, packing lists, export licenses, export proceeds verification/cancellation forms, customs clearance certificates for outbound goods, etc.); Commercial—Commercial documents include commercial invoices, pro forma invoices, packing lists, weight lists (or certificates), quantity certificates, and measurement lists; Submission—Documents required to be submitted to customs alongside the export declaration form include invoices, packing lists, and contracts; Inspection Declaration—Items include the export goods declaration form, inspection and quarantine certificates for outbound goods, and general certificates of origin; Origin—General certificate of origin; Documents—Commercial documents, contracts, invoices, transport documents, and packing lists—Six key aspects to check: the complete set of documents, the six categories of commercial documents, simultaneous submission to customs, inspection and quarantine certificates, certificates of origin, and the commercial document checklist;
ensure all six aspects are complete.
III. Actual Documentation
What to look for in the actual documentation.
Based on actual export customs declaration practices, the information should be reviewed as follows: Documentation—materials verifying the actual details of the import/export goods (including product name, specifications, intended use, country of origin, trade mode, etc.; *Practical Handbook on China Customs Declaration*); Product Name—product name, specifications, intended use, country of origin, and trade mode are the core elements verifying the actual status of the goods (*Practical Handbook on China Customs Declaration*); Key Focus—the customs declaration form consists of sections such as the header, body, container details, and accompanying documents (totaling 105 data entry fields; General Administration of Customs Policy Direct Line); Modules—to facilitate understanding, these fields are categorized into nine modules (the first module covers basic identification information, including core items such as the customs office of declaration, pre-entry number, and customs reference number; General Administration of Customs); Completion—the declaration form must be filled out in accordance with customs regulations (*Export Goods Declaration Form*, Tsinghua University Press); Network Transmission—electronic declaration data and accompanying documents are transmitted to Customs in compliance with declaration specifications (“Internet + Customs”). Summary of the six key aspects: product name/specifications/use, country of origin/trade mode, 105 data entry fields, nine modules, form completion, and electronic data transmission—this covers the six essential areas of information.
IV.
Special Information
What to look for regarding special information.
Based on customs special declaration practices, here is what to look for: **No. 77**—Contracts, invoices, technical specifications, and other relevant documents must be uploaded when filing the customs declaration (GACC Announcement No. 77 of 2026 regulates export declarations for items such as lathes, milling machines, and grinding machines); **Express Shipments**—Supporting documents for Class C express shipment declarations may be submitted via paper or optical disc (cross-border e-commerce declaration lists do not require the attachment of such materials; GACC); **Consistency**—Information provided must be truthful, complete, and accurate (and consistent with supporting documents like contracts, invoices, and technical specifications, as well as logistics information; parties bear liability if Customs questions the data; interpretation of GACC Announcement No. 77); **Expedited Clearance**—Customs expedites clearance for compliant goods with complete declaration elements (Customs will scrutinize cases where the authenticity of the information is in doubt; GACC); **Dredgers**—Contracts, invoices, and other relevant documents must be attached (if a formal response letter regarding the goods has been obtained from the export control authority, it must also be submitted; GACC Announcement No. 9 of 2026); **Drones**—Contracts, invoices, technical specifications, and other relevant documents must be attached when filing the declaration (supporting documents for Class C express shipments may be submitted via paper or optical disc; cross-border e-commerce declaration lists do not require such materials; GACC drone announcement)—**Six Key Points for Special Compliance**: contracts/invoices/technical specifications; Class C express shipment paper/optical disc submissions; truthful/complete/consistent information; expedited clearance for complete declaration elements; export control response letters; and drone-specific attachments.
These six points ensure special compliance.
V. Coordination of Goods Preparation
What to look for regarding the coordination of goods preparation.
Based on practical experience in coordinating export customs declaration and cargo preparation, the workflow involves six key aspects: **Weighing & Measuring** (precisely weighing and measuring the cargo—confirming gross weight, net weight, and volume—to ensure data consistency with subsequent declaration documents; this is crucial for avoiding declaration delays, especially given increasingly strict customs weight verification and the prohibition of misreporting or omissions); **Commissioning** (providing container loading details—including product name, quantity, weight, volume, etc.—when commissioning the customs declaration); **Booking** (generally recommended to book with the freight forwarder and secure the Shipping Order (SO) two weeks in advance); **Container Loading & Haulage** (coordinating with the freight forwarder for loading and trucking—paying attention to the container’s departure time from the factory, actual loading quantity, etc.); **Commodity Inspection** (promptly declaring goods requiring inspection to the relevant entry-exit inspection and quarantine authorities; required documents include the Customs Clearance Form for Outbound Goods); and **Data Consistency** (ensuring gross weight, net weight, and volume data match the declaration documents).
A smooth workflow relies on the seamless integration of these six elements: precise weighing/measuring, loading details, advance booking, loading/trucking, inspection declaration, and data consistency.
Conclusion
Regarding the customs declaration documentation for non-standard assembly lines, the conclusion is that the requirements are defined across five dimensions: statutory, commercial, actual, special, and procedural coordination.
Statutory: Eight accompanying documents (contract, invoice, packing list, cargo manifest, bill of lading/waybill, customs declaration authorization agreement, import/export licenses, and other documents required by law/regulation) plus the processing trade handbook, the six-copy paper export customs declaration form, and information regarding the relationship between buyer and seller. Commercial: Export declaration documents (contract, letter of credit, invoice, packing list, export license, export proceeds verification/cancellation form, customs clearance certificate for outbound goods) plus six categories of commercial documents (commercial invoice, pro forma invoice, packing list, weight list, quantity list, measurement list) plus the export declaration form, inspection and quarantine certificate for outbound goods, and general certificate of origin. Actual: Data proving the actual status of goods (product name, specifications, usage, origin, trade mode); customs declaration form comprising 105 data fields across 9 modules (header, body, container details, accompanying documents, etc., including basic identification info like pre-entry numbers and Customs reference numbers); transmission of electronic data in compliance with declaration standards. Special: Compliance with Announcement No. 77 (2026) requiring contracts, invoices, and technical data for lathes, milling machines, and grinders; submission of accompanying documents for Class C express shipments (paper or CD); no accompanying documents required for cross-border e-commerce manifests; requirement for truthful, complete, and accurate information consistent with documents and logistics (liability for discrepancies); complete declaration elements to expedite clearance; inclusion of official responses regarding export controls for dredgers; same rules apply to drones. Coordination: Precise weighing and measuring during the stock preparation stage to confirm gross weight, net weight, and volume (consistency with declaration data to avoid delays and Customs scrutiny regarding errors/omissions); provision of container loading data (product name, quantity, weight, volume) to the customs broker; booking space two weeks in advance; monitoring factory departure times and actual loading quantities for container trucks; timely application for inspection of goods requiring it.
In line with industry practice, customs declaration requirements can be summarized as follows: eight statutory documents and six categories of commercial documents—complete with product names, specifications, and origins, and accompanied by contracts, invoices, and technical data.
Clear these hurdles, and the customs declaration process will be worry-free.
