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Customs Documentation Guide
Customs Documentation Guide
The Complete Guide to Customs Documentation
Customs documentation is the foundation of international trade compliance. A single missing or incorrect document can result in cargo holds at the port, financial penalties, delayed delivery, and in some cases, seizure of goods. Every international shipment requires a specific set of documents that must be accurate, consistent with each other, and submitted to customs authorities in the correct format and within the required timeframe. This guide explains every document you are likely to encounter in international freight.
The Documents Every Shipment Requires
Commercial Invoice
The primary document for customs valuation. Must include: seller name and address, buyer name and address, invoice number and date, full description of goods (not a trade name — a description customs can classify), HS code, quantity, unit price, total value, currency, country of origin, and Incoterms. Any inconsistency with the packing list will attract customs attention.
Packing List
Itemises each carton or package in the shipment — carton number, contents, quantity per carton, gross weight, net weight, and dimensions. Must correspond exactly to the commercial invoice. The packing list is used by port authorities and customs to verify the cargo during physical examination.
Bill of Lading / Airway Bill
Issued by the carrier (shipping line or airline), this is the transport document and receipt for the cargo. For sea freight: Bill of Lading (B/L). For air freight: Air Waybill (AWB). Original B/Ls are negotiable instruments — used in documentary credit transactions. Telex release B/Ls are non-negotiable and allow cargo release without original documents.
Certificate of Origin (COO)
Certifies the country in which the goods were manufactured. Required for most customs entries and essential for preferential duty rate claims under free trade agreements. For China-origin goods, COOs are issued by CCPIT (China Council for the Promotion of International Trade) or the relevant chamber of commerce.
Additional Documents for Regulated Cargo
Phytosanitary Certificate
Required for plant products, agricultural goods, wood packaging, and seeds. Issued by the national plant protection authority. Certifies the cargo is free from regulated pests and diseases. Required at destination for customs release of agricultural goods.
Health Certificate
Required for food products, animal products, and pharmaceutical goods. Certifies the cargo meets the health and safety standards of the exporting country. For China food exports, issued by the China Inspection and Quarantine authority.
DG Declaration
Required for any cargo classified as dangerous goods under IMDG (ocean) or IATA (air) regulations. The Dangerous Goods Declaration lists the UN number, proper shipping name, packing group, quantity, and emergency contact information.
Documents Required for US Imports
ISF 10+2 Filing
Importer Security Filing required for all US-bound ocean cargo. Must be filed 24 hours before vessel loading at the foreign port. Contains 10 data elements from the importer and 2 from the carrier. Late filing results in $5,000 CBP penalties.
CBP Formal Entry
For shipments valued over $2,500, a formal entry must be filed with US CBP after vessel arrival. Requires commercial invoice, packing list, B/L, COO, and any additional product-specific documentation. Cleared by a licensed customs broker.
ACH Duty Payment
US import duties are paid via Automated Clearinghouse (ACH) electronic payment. Your customs broker files the entry and arranges duty payment. For large duty amounts, a continuous bond must be in place.
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