Importers of HS 3307.90 (other) from Korea, South actually paid 9.94% on the taxed portion of the value in 2026-06 — 9.91% across everything shipped, taxed or not. Measured from official duty receipts, not the rulebook: the statutory MFN base rate on this code is 5.4%. Over the window the rate on the taxed portion moved 5.4% → 9.94%, with the largest single step +4.3pp in 2025-04. Measured from official US duty receipts · as-of 2026-06 · confidence: measured, not modelled. The HTS base rate is 5.4% — importers actually paid 9.94%, so the trade-war overlay added 4.5 pts, measured at the border (not a summed rulebook estimate). Reproduce exactly: tariff_story(hs: "3307.90", origin: "Korea, South") · see it at trimtabist.com/tariffs
HS 3307.90. The schedule base rate is 5.4%; importers from South Korea actually paid 9.94% on the dutiable value in 2026-06 — the trade-war overlay added 4.5 points, measured at the border. Measured, not modelled.
Over the window the collected rate moved 5.4% (2023-07) → 9.94% (2026-06), largest single step +4.3pp in 2025-04.
Korea, South's lower duty (9.91% vs 40.4%) lets it price up to 27.7% above China at the factory and still match on duty-inclusive customs cost. But on the LATEST measured prices, China actually lands cheaper — $2.77/kg vs $11.56/kg (duty in, freight out).
All goods from South Korea · the whole tariff ledger · 4 CBP rulings cite this code · reproduce: tariff_story(hs: "3307.90", origin: "South Korea") via /connect. Not customs or legal advice.