Importers of HS 8415.90 (other) from Japan actually paid 13.91% on the taxed portion of the value in 2026-06 — 13.89% across everything shipped, taxed or not. Measured from official duty receipts, not the rulebook: the statutory MFN base rate on this code is 1.4%. Over the window the rate on the taxed portion moved 1.4% → 13.91%, with the largest single step -8.7pp in 2026-06. Measured from official US duty receipts · as-of 2026-06 · confidence: measured, not modelled. The HTS base rate is 1.4% — importers actually paid 13.91%, so the trade-war overlay added 12.5 pts, measured at the border (not a summed rulebook estimate). Reproduce exactly: tariff_story(hs: "8415.90", origin: "Japan") · see it at trimtabist.com/tariffs
HS 8415.90. The schedule base rate is 1.4%; importers from Japan actually paid 13.91% on the dutiable value in 2026-06 — the trade-war overlay added 12.5 points, measured at the border. Measured, not modelled.
Over the window the collected rate moved 1.4% (2023-07) → 13.91% (2026-06), largest single step -8.7pp in 2026-06.
Japan's lower duty (13.89% vs 24.86%) lets it price up to 9.6% above China at the factory and still match on duty-inclusive customs cost. But on the LATEST measured prices, China actually lands cheaper — $8.22/kg vs $20.81/kg (duty in, freight out).
12 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.
All goods from Japan · the whole tariff ledger · 5 CBP rulings cite this code · reproduce: tariff_story(hs: "8415.90", origin: "Japan") via /connect. Not customs or legal advice.