Importers of HS 8409.99 (to be installed in vehicles of subheading 8701.21, 8701.22, ) from Korea, South actually paid 9.61% on the taxed portion of the value in 2026-06 — 7.6% 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% → 9.61%, with the largest single step +23.3pp 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 9.61%, so the trade-war overlay added 7.1 pts, measured at the border (not a summed rulebook estimate). Reproduce exactly: tariff_story(hs: "8409.99", origin: "Korea, South") · see it at trimtabist.com/tariffs
HS 8409.99. The schedule base rate is 2.5%; importers from South Korea actually paid 9.61% on the dutiable value in 2026-06 — the trade-war overlay added 7.1 points, measured at the border. Measured, not modelled.
Over the window the collected rate moved 2.5% (2023-07) → 9.61% (2026-06), largest single step +23.3pp in 2025-09.
Korea, South's lower duty (7.6% vs 35.11%) lets it price up to 25.6% above China at the factory and still match on duty-inclusive customs cost. But on the LATEST measured prices, China actually lands cheaper — $4.82/kg vs $9.05/kg (duty in, freight out).
All goods from South Korea · the whole tariff ledger · 17 CBP rulings cite this code · reproduce: tariff_story(hs: "8409.99", origin: "South Korea") via /connect. Not customs or legal advice.