Quick Answer
International trade documents fall into four groups: (1) transaction documents (quotation, proforma invoice (PI), contract, purchase order (PO)); (2) shipping documents (commercial invoice, packing list, bill of lading or air waybill); (3) official and certifying documents (import/export declarations, certificate of origin, inspection or health certificates, permits); and (4) payment documents (letter of credit, remittance records). The golden rule: product description, quantity, weight and amounts must match across all documents and the actual goods, or you risk clearance delays, L/C refusal or regulatory problems.
International Trade Documents at a Glance
| Group | Document | Issued by | Purpose |
|---|---|---|---|
| Transaction | Quotation | Seller | Lists items, unit prices, trade terms and validity |
| Transaction | Proforma invoice (PI) | Seller | Confirms the order; often the basis for payment or opening an L/C |
| Transaction | Sales / purchase contract | Buyer and seller | Sets responsibilities, lead time, payment, quality and dispute resolution |
| Transaction | Purchase order (PO) | Buyer | Formal order |
| Shipping | Commercial invoice | Seller | Basis for pricing, customs and payment |
| Shipping | Packing list | Seller | Packages, weights, volume and packing method |
| Shipping | Bill of lading (B/L) / air waybill (AWB) | Carrier or forwarder | Receipt for goods and evidence of the contract of carriage; an ocean B/L is also a document of title |
| Official | Import/export declaration | Declarant (customs broker) | Filed with customs |
| Certifying | Certificate of origin (C/O) | Issuing body | Proves origin for preferential duties or importer requirements |
| Certifying | Inspection, health and certification documents | Inspection bodies or authorities | As required by product and importing country |
| Payment | Letter of credit (L/C) | Issuing bank | The bank’s undertaking to pay against documents |
| Payment | Remittance record (T/T) | Bank | Proof of payment |
How Documents Must Match
- Commercial invoice ↔ packing list: product, quantity and package count must match.
- Packing list ↔ bill of lading: packages, weight and shipping marks must match. Under Article 55 of Taiwan’s Maritime Act, the shipper guarantees the accuracy of the description, quantity and packing it declares and is liable if they are wrong.
- Commercial invoice ↔ certificate of origin: product and origin must match.
- All shipping documents ↔ L/C terms: in L/C transactions, discrepancies can lead to refusal of payment.
How Are Triangular Trade Documents Different?
Triangular trade has two sets of invoices, from the supplier to the trader and from the trader to the buyer, and bill of lading details may need adjusting. The two sets must match on product and quantity, but the facts about the goods (such as origin and shipment date) cannot change. See the Triangular Trade Process Flowchart and What Is a Switch Bill of Lading?
What Else Do Food Ingredient Exports Need?
Depending on the destination: ingredient and nutrition labeling information, test reports, health certificates, and certifications such as Halal. For example, exports to the US require FDA registration and prior notice procedures, and since 7 May 2025 Taiwan-made goods exported to the US also need a declaration of origin for goods exported to the United States.
How Tang Sugar Can Help
Tang Sugar’s triangular and multilateral trade service coordinates and checks documents, including commercial invoices, packing lists and bills of lading, for smooth clearance, and our international sourcing agent service helps confirm purchasing documents, commercial invoices, shipping terms and settlement. Contact us.
FAQ
What documents are needed for international trade?
Common ones are the quotation, proforma invoice, contract, purchase order, commercial invoice, packing list, bill of lading, import/export declarations, certificate of origin, inspection or health documents, and the letter of credit or remittance record.
What is the difference between a proforma invoice and a commercial invoice?
A proforma invoice is issued before the deal to confirm the order and serve as the basis for payment or opening an L/C; a commercial invoice is issued at shipment for customs and payment.
What is the difference between a commercial invoice and a packing list?
The commercial invoice shows product, unit price and amount; the packing list shows packages, weight, volume and packing method. Their content must match.
What happens if trade documents don’t match?
It can cause clearance delays, refusal of payment under a letter of credit, or regulatory and liability issues.
Further Reading
- What Is a Bill of Lading? Telex Release Explained
- How to Get a Certificate of Origin in Taiwan
- What Is a Customs Broker?
Sources
- Laws & Regulations Database of Taiwan: Maritime Act (Arts. 53–55)
- Central News Agency (2025-04-25): Taiwan-made exports to the US require a declaration from 7 May (in Chinese)
- Tang Sugar: Triangular and Multilateral Trade, International Sourcing Agent
