WCO: What is the Harmonized System?
The HS organizes internationally traded goods using six-digit codes and classification rules. A product description is the starting point; a commercial nickname alone does not establish classification.
Evidence to gather: Gather composition, intended function, construction and product specifications; identify the destination tariff extension and relevant legal notes.
Limit: The Desk suggests research questions, not binding classifications. National tariff treatment must be checked separately.
Read WCO: What is the Harmonized System? · Guidance reviewed 2026-09-10
WTO: Customs valuation methods
The WTO valuation framework starts with transaction value when its conditions are met and provides alternative methods when it cannot be used. Adjustments and method order matter.
Evidence to gather: Separate invoice price, assists, royalties, related-party issues and transport components. Ask which additions the destination law requires.
Limit: Invoice value and customs value may differ. Do not choose a replacement value or assume identical freight treatment in every jurisdiction.
Read WTO: Customs valuation methods · Guidance reviewed 2026-09-10
WTO: Rules of origin
Preferential and non-preferential origin rules serve different purposes. Preferential eligibility depends on the relevant arrangement; routing a shipment through a country does not itself establish preferential origin.
Evidence to gather: Identify manufacturing operations, inputs, origin evidence and the exact preference claimed. Compare the applicable agreement and importing-country rule.
Limit: Shipment origin, seller address and customs origin are different facts. No preference or zero-duty claim is verified without the applicable rule.
Read WTO: Rules of origin · Guidance reviewed 2026-09-10
WTO: Trade Facilitation Agreement
The Trade Facilitation Agreement addresses advance rulings, including tariff classification and origin, subject to its terms. An advance ruling can be a route for resolving a specific customs uncertainty before importation.
Evidence to gather: Identify the competent authority, applicant eligibility, required product evidence and national application process.
Limit: Do not promise an issuance date, approval, or that a ruling covers different goods or facts.
Read WTO: Trade Facilitation Agreement · Guidance reviewed 2026-09-10
UNECE: Recommendation 5, Incoterms abbreviations
UNECE Recommendation 5 explains the standardized abbreviations of ICC trade terms and their role in describing delivery responsibilities.
Evidence to gather: Write the selected rule, named place or port and edition; compare who arranges carriage, handles export/import formalities, and bears risk at the agreed delivery point.
Limit: This UNECE reference is not the full ICC rulebook. LIFA explanations are planning guidance; contract interpretation still needs the applicable terms.
Read UNECE: Recommendation 5, Incoterms abbreviations · Guidance reviewed 2026-09-10
IMO: Verified gross mass of packed containers
For packed containers within the SOLAS rule scope, the shipper provides verified gross mass for ship stowage planning. Verification can use weighing of the packed container or an approved certified method combining contents and container tare mass.
Evidence to gather: Identify the shipper, packed weight method, tare mass, responsible submitter and the terminal booking cutoff.
Limit: VGM does not guarantee loading. A packing-list estimate is not automatically a verified mass; confirm local method approval and operational timing.
Read IMO: Verified gross mass of packed containers · Guidance reviewed 2026-09-10
IPPC: Wood packaging material guidance
ISPM 15 addresses pest risks from raw-wood packaging used in international trade, including dunnage. Its scope excludes wood processed so that it is free from pests, such as plywood.
Evidence to gather: Identify packaging material and applicable destination controls. For regulated wood packaging, obtain treatment and marking evidence traceable to the authorized operator.
Limit: Do not claim that every pallet requires identical treatment or that a photograph proves compliance. Confirm the current standard and national implementation.
Read IPPC: Wood packaging material guidance · Guidance reviewed 2026-09-10
U.S. PHMSA: Transporting lithium batteries
PHMSA explains lithium-battery transportation risks and the U.S. hazardous-materials framework. Test-summary availability is part of the lithium cell and battery requirements.
Evidence to gather: Collect chemistry, watt-hours or lithium content, condition, configuration (alone, packed with equipment, or contained in equipment), test summary and transport mode.
Limit: This is U.S. transport guidance. Confirm destination and mode-specific packing, marking, documentation and restrictions; a test summary alone does not authorize shipment.
Read U.S. PHMSA: Transporting lithium batteries · Guidance reviewed 2026-09-10
European Commission: CE marking
CE marking is the manufacturer declaration for products covered by applicable EU harmonization legislation. Importers and distributors also have responsibilities in ensuring compliant products reach the EEA market.
Evidence to gather: Identify the exact product legislation, conformity-assessment route, technical documentation, declaration and responsible economic operators.
Limit: CE marking is not a universal product requirement or an EU-issued approval. Product-specific obligations and any third-party assessment must be established separately.
Read European Commission: CE marking · Guidance reviewed 2026-09-10
CPSC: General-use product testing and certification
General-use products subject to applicable CPSC safety rules require certification supported by product testing or a reasonable testing program. General-use testing is distinct from the third-party testing rules for children’s products.
Evidence to gather: Determine whether a CPSC rule applies, identify the responsible importer, and match test evidence and certificate to the actual product.
Limit: The older FAQ body says no government filing is required, but its current banner warns of 2026 eFiling changes. Use the current eFiling FAQ for filing obligations; do not repeat the older blanket statement.
Read CPSC: General-use product testing and certification · Guidance reviewed 2026-09-10
CPSC: Third-party testing guidance
Nearly all children’s products need third-party testing against applicable children’s product safety rules by a CPSC-accepted laboratory. Product-specific rules and exceptions still matter.
Evidence to gather: Establish intended age, applicable rules, lab acceptance and test scope; match the tested model, materials and production changes to the certificate.
Limit: A supplier certificate or sample photo does not establish that the shipped product complies. Verify product scope and current exceptions.
Read CPSC: Third-party testing guidance · Guidance reviewed 2026-09-10
CPSC: Current eFiling FAQ
The CPSC FAQ explains certificate data for Full PGA and Reference PGA filings and product-specific exceptions. Reference filing uses certificate identifiers, including Certifier ID, Product ID and Version ID.
Evidence to gather: Establish whether the product requires a certificate, reconcile product and testing records, and agree the filing method with the importer and broker.
Limit: The FAQ contains transitional wording and initial enforcement discretion. Neither warning-only processing nor an exception for samples removes other product-safety obligations. Recheck current applicability for the shipment.
Read CPSC: Current eFiling FAQ · Guidance reviewed 2026-09-10
U.S. International Trade Administration: Trade Finance Guide
Payment methods distribute commercial and credit risk differently between buyer and seller. The guide compares cash in advance, letters of credit, documentary collections, open account and consignment from a U.S. exporter perspective.
Evidence to gather: Compare release conditions, documents, payment timing and counterparties. Separate bank-document conditions from inspection and acceptance obligations in the commercial agreement.
Limit: Exporter protection is not automatically importer protection. No payment method independently verifies product quality or counterparty reliability.
Read U.S. International Trade Administration: Trade Finance Guide · Guidance reviewed 2026-09-10
FBI: Business email compromise
Payment requests can arrive through spoofed or compromised business email. The FBI advises verifying account-number or payment-procedure changes with the requester through an independently established contact channel.
Evidence to gather: Pause an unexpected payment change; call an independently obtained number, compare the beneficiary against the agreed party, and record the verification before approval. If fraud is suspected after sending money, contact the financial institution immediately.
Limit: These are fraud-prevention steps, not proof that an account or supplier is genuine. The FBI reporting channel is a U.S. authority; local reporting routes may also apply.
Read FBI: Business email compromise · Guidance reviewed 2026-09-10
OFAC: Indirect ownership under the 50 Percent Rule
OFAC explains how aggregate ownership by blocked persons can block entities through chains of ownership. A simple multiplication of percentages can miss the effect of an intermediate blocked entity.
Evidence to gather: Identify the parties and relevant ownership stakes, trace intermediate entities, and compare the actual structure with current OFAC guidance and applicable programs.
Limit: This is a U.S. sanctions reference, not a worldwide clearance test. An absent name match does not establish transaction eligibility; the Desk does not provide sanctions clearance.
Read OFAC: Indirect ownership under the 50 Percent Rule · Guidance reviewed 2026-09-10