Importers of HS 3926.90 (gaskets, washers and other seals) from Canada actually paid 14.63% on the taxed portion of the value in 2026-06 — 0.46% 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 5.08% → 14.63%, with the largest single step +18pp in 2025-03. Measured from official US duty receipts · as-of 2026-06 · confidence: measured, not modelled. The HTS base rate is 3.5% — importers actually paid 14.63%, so the trade-war overlay added 11.1 pts, measured at the border (not a summed rulebook estimate). Reproduce exactly: tariff_story(hs: "3926.90", origin: "Canada") · see it at trimtabist.com/tariffs
HS 3926.90. The schedule base rate is 3.5%; importers from Canada actually paid 14.63% on the dutiable value in 2026-06 — the trade-war overlay added 11.1 points, measured at the border. Measured, not modelled.
Over the window the collected rate moved 5.08% (2023-07) → 14.63% (2026-06), largest single step +18pp in 2025-03.
Canada's lower duty (0.46% vs 20.29%) lets it price up to 19.7% above China at the factory and still match on duty-inclusive customs cost. But on the LATEST measured prices, China actually lands cheaper — $2.21/kg vs $56/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 · 116 CBP rulings cite this code · reproduce: tariff_story(hs: "3926.90", origin: "Canada") via /connect. Not customs or legal advice.