
Key Takeaways
- Verify rules of origin criteria before buying goods, not after the CO has been ordered.
- Ensure the CO details match the commercial invoice, HS Code, and actual shipment packing list.
- File all FTA supporting documents in the import folder of each specific shipment.
- Ensure the exporter issues the correct CO form type matching the relevant trade agreement.
What is a CO and How Does It Link to FTAs?
A Certificate of Origin (CO) is an official document certifying that the products in a shipment were manufactured in a particular country. It is issued by authorized national bodies, such as the Department of Foreign Trade or the Chamber of Commerce in the exporting country.
The CO acts as the key to claiming tariff reductions or exemptions under Free Trade Agreements (FTAs), of which Thailand has many, including AFTA (ASEAN), JTEPA (Thailand-Japan), TAFTA (Thailand-Australia), and RCEP. Each FTA requires a specific CO form, and the qualification processes vary by agreement.
- Cargo Origin Certification
- Correct HS Code classification
- Product Specific Rules (PSR)
- Exporter and Importer details
- Supporting cost and origin documentation
A CO is More Than a Simple Attachment
A CO is linked to the physical production and source materials of the goods, not just the country of dispatch. Because products often contain imported components or undergo multi-country assembly, you must verify compliance with rules of origin before calculating duty reductions.
All information on the CO must correspond with the commercial invoice and packing list. The description of goods, trade marks, and weights on the CO must represent the actual cargo. Discrepancies between the invoice and the CO may prompt customs to reject the preferential tariff claim.
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There are multiple CO forms dedicated to different trade agreements, such as Form A (for GSP), Form D (for AFTA), Form E (for the ASEAN-China FTA), Form J (for JTEPA), electronic COs (e-Form), and Back-to-Back COs for shipments split or re-consigned through a hub country before reaching the destination.
Importers must coordinate closely with the overseas seller to secure the correct CO form type to ensure a smooth import declaration process.
Pros and Cons of Claiming FTA Tariff Preferences
The primary advantage is cost reduction, as many FTAs lower import duties from standard rates of 10-20% down to 0%, directly improving your landed costs and competitiveness.
The disadvantage is the compliance burden. Importers bear the liability if the origin data is found to be incorrect or falsified. Companies must balance duty savings against the administrative costs of maintaining rigorous customs compliance.
Required Records for FTA Audit Trail
Besides the CO, importers should keep supporting evidence, including manufacturer cost sheets, supplier declarations certifying raw material origin, bills of materials (BOM), and descriptions of the production process to resolve any post-importation customs audits.
Official Reference Agencies and Regulations
- Thai Customs Department: Electronic paperless declaration entry guidelines and customs clearance procedures.
- Ministry of Commerce & DFT: Regulations on preferential Certificates of Origin (Form CO) and targeted import-export control lists.
A Certificate of Origin (CO) is used to certify the economic nationality of products to claim preferential tax benefits under Free Trade Agreements (FTAs). However, goods must meet the specific rules of origin, and all documents must align perfectly. Incorrect declarations or mismatched documents can lead to the denial of benefits and severe post-clearance tax audit risks.
Frequently Asked Questions
Q: Is duty reduction guaranteed if we present a CO?
A: No, it is not guaranteed. You must verify if the specific HS Code is included in the tariff reduction list of the relevant FTA, and check if the goods meet the rules of origin criteria. Some items may qualify for the FTA but still have a non-zero preferential duty rate.
Q: Can we verify the Certificate of Origin online?
A: Yes, many government websites and trade departments provide verification portals for certified COs and licenses. Always use official government channels to check validity, as falsified certificates carry severe penalties under customs law.
Q: Do Certificates of Origin expire?
A: Yes, most COs have a limited validity period, typically 12 months from the date of issue or as specified by the respective FTA agreement. Importers must check the expiry date before submitting the declaration.
Q: How long does it take to obtain a Certificate of Origin?
A: Typically, it takes 1 to 3 business days if all cost calculations and application documents are ready. It is best to have the exporter apply for the CO 2 to 3 days before cargo departure to allow time for any corrections.


