For hardware components shipped by sea to the US, the party responsible for documentation is the Importer of Record (IOR)—meaning the importer or an authorized customs broker handles clearance with US Customs and Border Protection (CBP). However, the quality of the documentation provided by the exporter directly determines the speed of customs clearance and the cost of tariffs.
The trade environment with the US in 2026 is complex: the scope of Section 232 additional tariffs on steel, aluminum, and copper has expanded, Section 301 tariffs remain in effect, and the $800 de minimis exemption has been eliminated;
consequently, documentation requirements have become increasingly stringent.
This article breaks down the essential documents.
I. Basic Trade Documents
Commercial Invoice: The core document used by CBP for tariff classification and duty calculation (must comply with 19 CFR 141.86 requirements)—including complete details of the buyer and seller, HTS codes, quantities, unit and total prices, country of origin, and trade terms; Packing List: Detailed breakdown of goods by carton (number of packages, packaging type, gross/net weight, dimensions); Ocean Bill of Lading: Contract of carriage and document of title; Insurance Policy (required for CIF/CIP terms).
Note: As of August 2025, the US has eliminated the de minimis exemption for small packages valued under $800; all commercial shipments now require formal customs declaration—the old practice of bypassing documentation for low-value shipments is no longer valid.
II. U.S. Customs Security Filings
First is the AMS (Automated Manifest System): Carriers or freight forwarders must submit the manifest to CBP 24 hours prior to vessel departure (the “24-Hour Rule”). Second is the ISF (Importer Security Filing, or “10+2”): Importers submit 10 data elements and carriers submit two; this must also be completed 24 hours before departure. Penalties for missing ISF filings are assessed per shipment, making this a mandatory pre-shipment check. Third is the Formal Entry (Customs Declaration): A formal declaration is made via the ACE system upon the cargo’s arrival, accompanied by the commercial invoice, bill of lading, and packing list.
U.S. Customs has issued a proposed rule for September 2026 requiring importers to submit export-side documents—such as Chinese export declarations, commercial invoices, packing lists, and certificates of origin—to verify the accuracy of the declaration. Export documents must align perfectly with customs declaration data;
therefore, proper records must be maintained from the source.
III. Key Points on Tariff Declaration (Focus for 2026)
Hardware structural components exported to the U.S. are subject to multiple layers of tariffs: Section 232 Additional Duties—new regulations expanding the scope take effect on April 6, 2026, applying a unified additional duty framework to steel, aluminum, copper, and their derivative products (starting at 25% for steel products, though the additional duty for some steel derivatives is reduced to zero; accurate classification under HTS 9903.xx additional duty codes is required during declaration); Section 301 Tariffs—additional tariffs on Chinese goods remain in effect; and Base Tariffs (Most-Favored-Nation rates).
A single shipment may involve multiple additional duty codes; classification errors carry the risk of back-tax payments and fines.
Declarations of origin must be precise—both Section 232 and Section 301 tariffs rely on the country of origin and the location of smelting/casting for determination; products with “U.S.-based smelting and casting” are subject to different tax rates.
IV. Product Compliance and Packaging
Country of Origin Marking: The US requires products and outer packaging to be marked “MADE IN CHINA.” Product Safety: Electromechanical products entering the US market often require safety certifications such as UL (primarily a market requirement, though customs may inspect for it) and must comply with ASTM standards. Wood Packaging: Wooden crates and pallets must undergo heat treatment in accordance with ISPM 15 and bear the IPPC mark (US APHIS will strictly enforce this starting in 2026; the mark must follow the hyphenated format and indicate the wood is debarked and pest-free); non-compliant packaging will result in denied entry.
V. Operational Checklist
- Pre-shipment document verification: Ensure consistency across the commercial invoice, packing list, and bill of lading;
have the customs broker pre-classify and confirm HTS codes and additional tariff codes. - ISF/AMS filing: Must be completed by the freight forwarder and importer 24 hours prior to vessel departure; confirm receipt of acknowledgment for each shipment.
- Products containing steel, aluminum, or copper: Calculate tariff rates separately according to new Section 232 regulations and factor these costs into price quotations.
- Wood packaging: Arrange for fumigation or heat treatment in advance and retain photographs of the IPPC marks.
- Record keeping: Retain export declarations, invoices, packing lists, and certificates of origin for the long term to handle potential traceability audits by US Customs.
Industry Insight: Pitfalls in exporting to the US often lie in “tariff classification” and “security declarations.” Incorrect additional tariff codes and missed ISF filings are the most common causes of fines;
accurately calculate tariff rates during the quoting stage and strictly manage declaration milestones before shipment.
