Importers of HS 9401.99 (of seats of a kind used for motor vehicles) from Mexico actually paid 10.45% on the taxed portion of the value in 2026-06 — 0.56% across everything shipped, taxed or not. Measured from official duty receipts, not the rulebook: the statutory MFN base rate on this code is Free. Over the window the rate on the taxed portion moved null% → 10.45%, with the largest single step +24.9pp in 2025-03. Measured from official US duty receipts · as-of 2026-06 · confidence: measured, not modelled. The HTS base rate is Free — importers actually paid 10.45%, so the trade-war overlay added 10.4 pts, measured at the border (not a summed rulebook estimate). Reproduce exactly: tariff_story(hs: "9401.99", origin: "Mexico") · see it at trimtabist.com/tariffs
HS 9401.99. The schedule base rate is Free; importers from Mexico actually paid 10.45% on the dutiable value in 2026-06 — the trade-war overlay added 10.4 points, measured at the border. Measured, not modelled.
Over the window the collected rate moved % (2023-07) → 10.45% (2026-06), largest single step +24.9pp in 2025-03.
Mexico's lower duty (0.56% vs 24.72%) lets it price up to 24% above China at the factory and still match on duty-inclusive customs cost. But on the LATEST measured prices, Mexico actually lands cheaper — $4.77/kg vs $4.94/kg (duty in, freight out).
5 Chapter-99 measures name Mexico; 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 Mexico · the whole tariff ledger · 15 CBP rulings cite this code · reproduce: tariff_story(hs: "9401.99", origin: "Mexico") via /connect. Not customs or legal advice.