Importers of HS 8503.00 (other) from Japan actually paid 5.87% on the taxed portion of the value in 2026-06 — 5.86% across everything shipped, taxed or not. Measured from official duty receipts, not the rulebook: the statutory MFN base rate on this code is 3%. Over the window the rate on the taxed portion moved 3.21% → 5.87%, with the largest single step -23.4pp in 2026-01. Measured from official US duty receipts · as-of 2026-06 · confidence: measured, not modelled. The HTS base rate is 3% — importers actually paid 5.87%, so the trade-war overlay added 2.9 pts, measured at the border (not a summed rulebook estimate). Reproduce exactly: tariff_story(hs: "8503.00", origin: "Japan") · see it at trimtabist.com/tariffs
HS 8503.00. The schedule base rate is 3%; importers from Japan actually paid 5.87% on the dutiable value in 2026-06 — the trade-war overlay added 2.9 points, measured at the border. Measured, not modelled.
Over the window the collected rate moved 3.21% (2023-07) → 5.87% (2026-06), largest single step -23.4pp in 2026-01.
Japan's lower duty (5.86% vs 42.7%) lets it price up to 34.8% above China at the factory and still match on duty-inclusive customs cost. But on the LATEST measured prices, China actually lands cheaper — $7.83/kg vs $15.44/kg (duty in, freight out).
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.
All goods from Japan · the whole tariff ledger · 10 CBP rulings cite this code · reproduce: tariff_story(hs: "8503.00", origin: "Japan") via /connect. Not customs or legal advice.