Importers of HS 3916.90 (of acrylic polymers) from Canada actually paid 15.83% on the taxed portion of the value in 2026-06 — 0.35% across everything shipped, taxed or not. Measured from official duty receipts, not the rulebook: the statutory MFN base rate on this code is 6.5%. Over the window the rate on the taxed portion moved 5.82% → 15.83%, with the largest single step +19.4pp in 2025-03. Measured from official US duty receipts · as-of 2026-06 · confidence: measured, not modelled. The HTS base rate is 6.5% — importers actually paid 15.83%, so the trade-war overlay added 9.3 pts, measured at the border (not a summed rulebook estimate). Reproduce exactly: tariff_story(hs: "3916.90", origin: "Canada") · see it at trimtabist.com/tariffs
HS 3916.90. The schedule base rate is 6.5%; importers from Canada actually paid 15.83% on the dutiable value in 2026-06 — the trade-war overlay added 9.3 points, measured at the border. Measured, not modelled.
Over the window the collected rate moved 5.82% (2023-07) → 15.83% (2026-06), largest single step +19.4pp in 2025-03.
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 · 4 CBP rulings cite this code · reproduce: tariff_story(hs: "3916.90", origin: "Canada") via /connect. Not customs or legal advice.