Importers of HS 8507.10 (lead-acid storage batteries, of a kind used for starting pis) from Mexico actually paid 3.54% on the taxed portion of the value in 2026-06 — 0.07% across everything shipped, taxed or not. Measured from official duty receipts, not the rulebook: the statutory MFN base rate on this code is 3.5%. Over the window the rate on the taxed portion moved 3.5% → 3.54%, with the largest single step -22.7pp in 2026-03. Measured from official US duty receipts · as-of 2026-06 · confidence: measured, not modelled. The HTS base rate is 3.5% — importers actually paid 3.54%, so the trade-war overlay added 0 pts, measured at the border (not a summed rulebook estimate). Reproduce exactly: tariff_story(hs: "8507.10", origin: "Mexico") · see it at trimtabist.com/tariffs
HS 8507.10. The schedule base rate is 3.5%; importers from Mexico actually paid 3.54% on the dutiable value in 2026-06 — the trade-war overlay added 0 points, measured at the border. Measured, not modelled.
Over the window the collected rate moved 3.5% (2023-07) → 3.54% (2026-06), largest single step -22.7pp in 2026-03.
7 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 · reproduce: tariff_story(hs: "8507.10", origin: "Mexico") via /connect. Not customs or legal advice.