TT

For US customs, the country of origin is generally where the goods were wholly obtained or produced, or where the last substantial transformation occurred. It is not necessarily the country the goods were shipped from, exported through, or purchased from. For example, assembling, processing, or combining components in another country may or may not change origin, depending on the facts and the applicable origin rules.

Origin matters because tariff measures and other import requirements can apply differently based on the product’s origin. In a country-specific measure table, the code “TT” identifies the country or customs territory being tracked; confirm its meaning in the page’s country-code legend or official source before relying on it. Common pitfalls include confusing shipping country with origin, assuming minor assembly changes origin, overlooking special rules for the product, and using supplier statements that lack supporting records.

What to check

• Confirm what “TT” represents in the applicable country-code list or official tariff data before interpreting a measure.
• Determine the product’s origin using the applicable US customs rule, including any product-specific or trade-agreement rule; seek broker or specialist advice when processing is complex.
• Map the manufacturing steps, materials, and component origins, and assess whether the final processing constitutes a substantial transformation rather than assuming the last assembly location controls.
• Collect and retain bills of materials, production records, supplier origin statements, invoices, and transport documents that support the origin conclusion.
• Check that the declared origin is consistent across the commercial invoice, customs entry data, marking, classification analysis, and any measure-specific requirements.