Importers of HS 8483.40 (other) from Japan actually paid 15.71% on the taxed portion of the value in 2026-06 — 12.61% across everything shipped, taxed or not. Measured from official duty receipts, not the rulebook: the statutory MFN base rate on this code is 2.5%. Over the window the rate on the taxed portion moved 2.77% → 15.71%, with the largest single step -6.2pp in 2026-04. Measured from official US duty receipts · as-of 2026-06 · confidence: measured, not modelled. The HTS base rate is 2.5% — importers actually paid 15.71%, so the trade-war overlay added 13.2 pts, measured at the border (not a summed rulebook estimate). Reproduce exactly: tariff_story(hs: "8483.40", origin: "Japan") · see it at trimtabist.com/tariffs
HS 8483.40. The schedule base rate is 2.5%; importers from Japan actually paid 15.71% on the dutiable value in 2026-06 — the trade-war overlay added 13.2 points, measured at the border. Measured, not modelled.
Over the window the collected rate moved 2.77% (2023-07) → 15.71% (2026-06), largest single step -6.2pp in 2026-04.
Japan's lower duty (12.61% vs 41.26%) lets it price up to 25.4% above China at the factory and still match on duty-inclusive customs cost. But on the LATEST measured prices, China actually lands cheaper — $8.77/kg vs $19.57/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 · 2 CBP rulings cite this code · reproduce: tariff_story(hs: "8483.40", origin: "Japan") via /connect. Not customs or legal advice.