Importers of HS 9608.40 (with a mechanical action for extending, or for extending and) from Mexico actually paid 10% on the taxed portion of the value in 2026-06 — 0.57% across everything shipped, taxed or not. Measured from official duty receipts, not the rulebook: the statutory MFN base rate on this code is 6.6%. Over the window the rate on the taxed portion moved null% → 10%, with the largest single step -25.3pp in 2025-10. Measured from official US duty receipts · as-of 2026-06 · confidence: measured, not modelled. The HTS base rate is 6.6% — importers actually paid 10%, so the trade-war overlay added 3.4 pts, measured at the border (not a summed rulebook estimate). Reproduce exactly: tariff_story(hs: "9608.40", origin: "Mexico") · see it at trimtabist.com/tariffs
HS 9608.40. The schedule base rate is 6.6%; importers from Mexico actually paid 10% on the dutiable value in 2026-06 — the trade-war overlay added 3.4 points, measured at the border. Measured, not modelled.
Over the window the collected rate moved % (2023-07) → 10% (2026-06), largest single step -25.3pp in 2025-10.
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: "9608.40", origin: "Mexico") via /connect. Not customs or legal advice.