Importers of HS 9018.31 (syringes, with or without needles; parts and accessories the) from Mexico actually paid 10% on the taxed portion of the value in 2026-06 — 0.72% 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%, with the largest single step +24.6pp in 2025-05. Measured from official US duty receipts · as-of 2026-06 · confidence: measured, not modelled. The HTS base rate is Free — importers actually paid 10%, so the trade-war overlay added 10 pts, measured at the border (not a summed rulebook estimate). Reproduce exactly: tariff_story(hs: "9018.31", origin: "Mexico") · see it at trimtabist.com/tariffs
HS 9018.31. The schedule base rate is Free; importers from Mexico actually paid 10% on the dutiable value in 2026-06 — the trade-war overlay added 10 points, measured at the border. Measured, not modelled.
Over the window the collected rate moved % (2023-07) → 10% (2026-06), largest single step +24.6pp in 2025-05.
Mexico's lower duty (0.72% vs 51.42%) lets it price up to 50.3% above China at the factory and still match on duty-inclusive customs cost. But on the LATEST measured prices, China actually lands cheaper — $7.65/kg vs $104.99/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 · 2 CBP rulings cite this code · reproduce: tariff_story(hs: "9018.31", origin: "Mexico") via /connect. Not customs or legal advice.