Importers of HS 4011.20 (radial) from Japan actually paid 25.43% on the taxed portion of the value in 2026-06 — 25.34% across everything shipped, taxed or not. Measured from official duty receipts, not the rulebook: the statutory MFN base rate on this code is 4%. Over the window the rate on the taxed portion moved 4% → 25.43%, with the largest single step +12.4pp in 2025-05. Measured from official US duty receipts · as-of 2026-06 · confidence: measured, not modelled. The HTS base rate is 4% — importers actually paid 25.43%, so the trade-war overlay added 21.4 pts, measured at the border (not a summed rulebook estimate). Reproduce exactly: tariff_story(hs: "4011.20", origin: "Japan") · see it at trimtabist.com/tariffs
HS 4011.20. The schedule base rate is 4%; importers from Japan actually paid 25.43% on the dutiable value in 2026-06 — the trade-war overlay added 21.4 points, measured at the border. Measured, not modelled.
Over the window the collected rate moved 4% (2023-07) → 25.43% (2026-06), largest single step +12.4pp in 2025-05.
Japan's lower duty (25.34% vs 53.7%) lets it price up to 22.6% above China at the factory and still match on duty-inclusive customs cost. But on the LATEST measured prices, Japan actually lands cheaper — $4.5/kg vs $4.5/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: "4011.20", origin: "Japan") via /connect. Not customs or legal advice.