Importers of HS 8504.31 (having a power handling capacity less than 1 kva) from Mexico actually paid 19.57% on the taxed portion of the value in 2026-06 — 3.34% 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 6.5% → 19.57%, with the largest single step +28.3pp in 2025-08. Measured from official US duty receipts · as-of 2026-06 · confidence: measured, not modelled. The HTS base rate is 6.6% — importers actually paid 19.57%, so the trade-war overlay added 13 pts, measured at the border (not a summed rulebook estimate). Reproduce exactly: tariff_story(hs: "8504.31", origin: "Mexico") · see it at trimtabist.com/tariffs
HS 8504.31. The schedule base rate is 6.6%; importers from Mexico actually paid 19.57% on the dutiable value in 2026-06 — the trade-war overlay added 13 points, measured at the border. Measured, not modelled.
Over the window the collected rate moved 6.5% (2023-07) → 19.57% (2026-06), largest single step +28.3pp in 2025-08.
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 · 1 CBP ruling cite this code · reproduce: tariff_story(hs: "8504.31", origin: "Mexico") via /connect. Not customs or legal advice.