The independent observatory for US trade — ship movements,
customs records and policy events, measured and tested.
What Japan actually pays on having an external volume not exceeding 300 cm3
Importers of HS 8506.40 (having an external volume not exceeding 300 cm3) from Japan actually paid 12.7% on the taxed portion of the value in 2026-06 — 7% across everything shipped, taxed or not. Measured from official duty receipts, not the rulebook: the statutory MFN base rate on this code is 2.7%. Over the window the rate on the taxed portion moved 2.7% → 12.7%, with the largest single step +4.5pp in 2025-04. Measured from official US duty receipts · as-of 2026-06 · confidence: measured, not modelled. The HTS base rate is 2.7% — importers actually paid 12.7%, so the trade-war overlay added 10 pts, measured at the border (not a summed rulebook estimate). Reproduce exactly: tariff_story(hs: "8506.40", origin: "Japan") · see it at trimtabist.com/tariffs
HS 8506.40. The schedule base rate is
2.7%; importers from Japan actually paid 12.7% on the
dutiable value in 2026-06 — the trade-war overlay added 10 points, measured at the border. Measured, not modelled.
Over the window the collected rate moved 2.7% (2023-07) → 12.7% (2026-06), largest single step +4.5pp in 2025-04.
The trade-war measures that name Japan or this sector
14 Chapter-99 measures name Japan; scope mapping is partial (several annexes are PDFs) — absence never means exemption. They do not sum, and some are product-specific — the collected rate above is the composed truth.
Notice of Implementation of Additional Duties on Products of India Pursuant to the President's Executive Order measure 9903.01.84 · Federal Register citation+25%
9903.79.01 measure 9903.79.01+25%
Implementing Certain Tariff-Related Elements of the United States-Japan Agreement measure 9903.02.30 · Federal Register citation+15%
9903.02.31 measure 9903.02.31+15%
Adoption and Procedures of the Section 232 Steel and Aluminum Tariff Inclusions Process measure 9903.02.71 · Federal Register citation+15%
Implementing Certain Tariff-Related Elements of the United States-Japan Agreement measure 9903.02.73 · Federal Register citation+15%
9903.04.62 measure 9903.04.62+15%
Implementing Certain Tariff-Related Elements of the U.S.-Korea Strategic Trade and Investment Deal measure 9903.76.21 · Federal Register citation+15%
In print: “What Japan actually pays on having an external volume not exceeding 300 cm3 (HS 8506.40)” —
Trimtab US Trade Ledger (TT-010 Duty receipts), US Census imports-for-consumption records — trimtabist.com/tariff/850640/japan