Importers of HS 2931.90 (other) from Japan actually paid 4.33% on the taxed portion of the value in 2026-06 — 4.33% across everything shipped, taxed or not. Measured from official duty receipts, not the rulebook: the statutory MFN base rate on this code is 3.7%. Over the window the rate on the taxed portion moved 3.74% → 4.33%, with the largest single step +16.1pp in 2025-09. Measured from official US duty receipts · as-of 2026-06 · confidence: measured, not modelled. The HTS base rate is 3.7% — importers actually paid 4.33%, so the trade-war overlay added 0.6 pts, measured at the border (not a summed rulebook estimate). Reproduce exactly: tariff_story(hs: "2931.90", origin: "Japan") · see it at trimtabist.com/tariffs
HS 2931.90. The schedule base rate is 3.7%; importers from Japan actually paid 4.33% on the dutiable value in 2026-06 — the trade-war overlay added 0.6 points, measured at the border. Measured, not modelled.
Over the window the collected rate moved 3.74% (2023-07) → 4.33% (2026-06), largest single step +16.1pp in 2025-09.
Japan's lower duty (4.33% vs 17.04%) lets it price up to 12.2% above China at the factory and still match on duty-inclusive customs cost. But on the LATEST measured prices, China actually lands cheaper — $2.04/kg vs $4.59/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 · reproduce: tariff_story(hs: "2931.90", origin: "Japan") via /connect. Not customs or legal advice.