Importers of HS 3402.90 (other) from Mexico actually paid 8.01% on the taxed portion of the value in 2026-06 — 0.04% across everything shipped, taxed or not. Measured from official duty receipts, not the rulebook: the statutory MFN base rate on this code is 3.7%. Over the window the rate on the taxed portion moved 3.81% → 8.01%, with the largest single step +38.7pp in 2025-08. Measured from official US duty receipts · as-of 2026-06 · confidence: measured, not modelled. The HTS base rate is 3.7% — importers actually paid 8.01%, so the trade-war overlay added 4.3 pts, measured at the border (not a summed rulebook estimate). Reproduce exactly: tariff_story(hs: "3402.90", origin: "Mexico") · see it at trimtabist.com/tariffs
HS 3402.90. The schedule base rate is 3.7%; importers from Mexico actually paid 8.01% on the dutiable value in 2026-06 — the trade-war overlay added 4.3 points, measured at the border. Measured, not modelled.
Over the window the collected rate moved 3.81% (2023-07) → 8.01% (2026-06), largest single step +38.7pp in 2025-08.
Mexico's lower duty (0.04% vs 38.72%) lets it price up to 38.7% above China at the factory and still match on duty-inclusive customs cost. But on the LATEST measured prices, Mexico actually lands cheaper — $1.33/kg vs $2.77/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 · 1 CBP ruling cite this code · reproduce: tariff_story(hs: "3402.90", origin: "Mexico") via /connect. Not customs or legal advice.