Import Duty from Japan to the U.S. in 2026: MFN Formula Required
Japan's July Section 301 treatment uses a product- and MFN-dependent formula, not one country rate.
No universal current U.S. tariff rate is available from country of origin alone.
Classification, product scope, origin, entry time, MFN treatment, Section 232 status, and exemptions can change the result. When any required selector is missing, the safe output is indeterminate / review required.
What the reviewed sources support
- The temporary Section 122 layer is historical after its stated endpoint.
- Japan's forced-labor action mode is a net-of-MFN formula. The answer depends on the base MFN rate, product schedule, entry time, and exceptions.
- Without those selectors, the correct product-level output is indeterminate.
What to do before pricing or filing
- Confirm the complete HTS classification and the product description used for entry.
- Check the current HTSUS and controlling Chapter 99 notes for the entry date.
- Evaluate product schedules, transition rules, Section 232 interaction, and exclusions.
- Keep the result in review-required state until every selector and source is resolved.
The Attahir Labs rate table and TariffShield use fail-closed containment while the legacy country snapshots lack current row-level provenance. They must not supply a current numeric customs result.
Reviewed official sources
- Federal Register 2026-03824 — Proclamation 11012
- USTR — final forced-labor Section 301 action
- USTR — final-action prepublication notice
- USITC — current Harmonized Tariff Schedule
- CBP — determining duty rates
Checked through: July 25, 2026 at 22:30 UTC. Re-review required no later than July 28, 2026 at 04:01 UTC or sooner if an official source changes.
Disclaimer: Informational content only. Verify the current HTSUS and CBP instructions or use a licensed customs broker for an entry-specific decision.