Importers of HS 3911.10 (petroleum resins, coumarone, indene or coumarone-indene resi) from Korea, South actually paid 10.31% on the taxed portion of the value in 2026-06 — 10.31% across everything shipped, taxed or not. Measured from official duty receipts, not the rulebook: the statutory MFN base rate on this code is 6.1%. Over the window the rate on the taxed portion moved 6.1% → 10.31%, with the largest single step -6.1pp in 2023-09. Measured from official US duty receipts · as-of 2026-06 · confidence: measured, not modelled. The HTS base rate is 6.1% — importers actually paid 10.31%, so the trade-war overlay added 4.2 pts, measured at the border (not a summed rulebook estimate). Reproduce exactly: tariff_story(hs: "3911.10", origin: "Korea, South") · see it at trimtabist.com/tariffs
HS 3911.10. The schedule base rate is 6.1%; importers from South Korea actually paid 10.31% on the dutiable value in 2026-06 — the trade-war overlay added 4.2 points, measured at the border. Measured, not modelled.
Over the window the collected rate moved 6.1% (2023-07) → 10.31% (2026-06), largest single step -6.1pp in 2023-09.
Korea, South's lower duty (10.31% vs 41.12%) lets it price up to 27.9% above China at the factory and still match on duty-inclusive customs cost. But on the LATEST measured prices, China actually lands cheaper — $1.91/kg vs $2.13/kg (duty in, freight out).
All goods from South Korea · the whole tariff ledger · reproduce: tariff_story(hs: "3911.10", origin: "South Korea") via /connect. Not customs or legal advice.