Importers of HS 3401.30 (containing any aromatic or modified aromatic surface-active ) from Canada actually paid 10% 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 4%. Over the window the rate on the taxed portion moved 4% → 10%, with the largest single step -30.4pp in 2026-04. Measured from official US duty receipts · as-of 2026-06 · confidence: measured, not modelled. The HTS base rate is 4% — importers actually paid 10%, so the trade-war overlay added 6 pts, measured at the border (not a summed rulebook estimate). Reproduce exactly: tariff_story(hs: "3401.30", origin: "Canada") · see it at trimtabist.com/tariffs
HS 3401.30. The schedule base rate is 4%; importers from Canada actually paid 10% on the dutiable value in 2026-06 — the trade-war overlay added 6 points, measured at the border. Measured, not modelled.
Over the window the collected rate moved 4% (2023-07) → 10% (2026-06), largest single step -30.4pp in 2026-04.
Canada's lower duty (0.04% vs 27.26%) lets it price up to 27.2% above China at the factory and still match on duty-inclusive customs cost. But on the LATEST measured prices, China actually lands cheaper — $1.87/kg vs $34.96/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 · 1 CBP ruling cite this code · reproduce: tariff_story(hs: "3401.30", origin: "Canada") via /connect. Not customs or legal advice.