Insights
Tariff figures you can repeat on a call with your customs broker.
A small, maintained reference library — verified monthly, every figure cited to its authority.
Insights
A small, maintained reference library — verified monthly, every figure cited to its authority.
The anchor · updated monthly · verified
Every duty layer on the power and connectivity HTS codes — adapters, USB-C and cable assemblies, coaxial, and fiber — for China, Vietnam, and Mexico, each cited to its authority.
Read the duty stack →At a glance · effective duty by origin
The effective tariff on a switching adapter (8504.40.85), by country of origin — each bar split into the layers that make it up. The China–Vietnam gap is the entire Section 301 layer.
25.0 points separate China from Vietnam — that is the Section 301 layer, and the whole sourcing decision. A USMCA-qualifying Mexican adapter enters duty-free.
Effective rate by product category — China vs. Vietnam
8504.40.858544.42.908544.20.008544.70.008471.80.10.00Connectorized cable (8544.42.90) sits highest because it carries a 25% Section 232 copper duty the other codes do not — and that layer applies from every origin, so a USMCA-Mexico cable assembly enters at 25.0%, not zero.
Effective : the 10% Section 122 surcharge was replaced by a 12.5% Section 301 forced-labor duty on China and Vietnam — what changed. Full breakdown by authority: the duty stack; estimate your per-unit cost with the landed-cost calculator.
In the library · verified monthly
Every figure cited to its authority and re-checked monthly — the detail behind the numbers.
Line by line through an external power supply spec sheet — what to accept, what to challenge, and why the efficiency figure is a legal minimum rather than a performance claim.
Read →ReferenceWhat cable assemblies pay by HTS code and origin — the Section 301 layers, plus the Section 232 copper duty that connectorized cable carries and power hardware does not.
Read →ReferenceWhat Vietnam origin does to your power-adapter duty, what it requires to hold up, and how China and Vietnam compare beyond the tariff line.
Read →QuestionYes — but only if the charger is substantially transformed in Vietnam, not merely assembled there from Chinese subassemblies.
Read →QuestionThe four documents that settle a country-of-origin claim — and why substantial transformation, not final assembly, is what makes an adapter Vietnamese.
Read →QuestionThe 10% surcharge expired at its 150-day limit on July 24, 2026 — and was replaced the same day by a 12.5% Section 301 forced-labor duty on China and Vietnam. Vietnam did not fall to 0%; the 25-point §301 delta held.
Read →Rates verified against HTSUS Rev. 19. Not customs or legal advice.