Importers of HS 8409.91 (other) from Korea, South actually paid 11.05% on the taxed portion of the value in 2026-06 — 10.06% across everything shipped, taxed or not. Measured from official duty receipts, not the rulebook: the statutory MFN base rate on this code is 2.5%. Over the window the rate on the taxed portion moved 2.5% → 11.05%, with the largest single step +10.4pp in 2025-09. Measured from official US duty receipts · as-of 2026-06 · confidence: measured, not modelled. The HTS base rate is 2.5% — importers actually paid 11.05%, so the trade-war overlay added 8.6 pts, measured at the border (not a summed rulebook estimate). Reproduce exactly: tariff_story(hs: "8409.91", origin: "Korea, South") · see it at trimtabist.com/tariffs
HS 8409.91. The schedule base rate is 2.5%; importers from South Korea actually paid 11.05% on the dutiable value in 2026-06 — the trade-war overlay added 8.6 points, measured at the border. Measured, not modelled.
Over the window the collected rate moved 2.5% (2023-07) → 11.05% (2026-06), largest single step +10.4pp in 2025-09.
Korea, South's lower duty (10.06% vs 33.56%) lets it price up to 21.4% above China at the factory and still match on duty-inclusive customs cost. But on the LATEST measured prices, China actually lands cheaper — $9.76/kg vs $11.18/kg (duty in, freight out).
All goods from South Korea · the whole tariff ledger · 15 CBP rulings cite this code · reproduce: tariff_story(hs: "8409.91", origin: "South Korea") via /connect. Not customs or legal advice.