Importers of HS 8421.32 (catalytic converters or particulate filters, whether or not ) from Canada actually paid 23.97% on the taxed portion of the value in 2026-06 — 0.17% 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% → 23.97%, with the largest single step +13.6pp in 2025-03. Measured from official US duty receipts · as-of 2026-06 · confidence: measured, not modelled. The HTS base rate is Free — importers actually paid 23.97%, so the trade-war overlay added 24 pts, measured at the border (not a summed rulebook estimate). Reproduce exactly: tariff_story(hs: "8421.32", origin: "Canada") · see it at trimtabist.com/tariffs
HS 8421.32. The schedule base rate is Free; importers from Canada actually paid 23.97% on the dutiable value in 2026-06 — the trade-war overlay added 24 points, measured at the border. Measured, not modelled.
Over the window the collected rate moved % (2023-07) → 23.97% (2026-06), largest single step +13.6pp in 2025-03.
Canada's lower duty (0.17% vs 40.54%) lets it price up to 40.3% above China at the factory and still match on duty-inclusive customs cost. But on the LATEST measured prices, China actually lands cheaper — $8.18/kg vs $32.34/kg (duty in, freight out).
7 Chapter-99 measures name Canada; 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 Canada · the whole tariff ledger · reproduce: tariff_story(hs: "8421.32", origin: "Canada") via /connect. Not customs or legal advice.