Importers of HS 8504.23 (having a power handling capacity exceeding 10,000 kva) from Korea, South actually paid 8.83% on the taxed portion of the value in 2026-06 — 8.83% across everything shipped, taxed or not. Measured from official duty receipts, not the rulebook: the statutory MFN base rate on this code is 1.6%. Over the window the rate on the taxed portion moved 1.6% → 8.83%, with the largest single step -11.8pp in 2026-02. Measured from official US duty receipts · as-of 2026-06 · confidence: measured, not modelled. The HTS base rate is 1.6% — importers actually paid 8.83%, so the trade-war overlay added 7.2 pts, measured at the border (not a summed rulebook estimate). Reproduce exactly: tariff_story(hs: "8504.23", origin: "Korea, South") · see it at trimtabist.com/tariffs
HS 8504.23. The schedule base rate is 1.6%; importers from South Korea actually paid 8.83% on the dutiable value in 2026-06 — the trade-war overlay added 7.2 points, measured at the border. Measured, not modelled.
Over the window the collected rate moved 1.6% (2023-07) → 8.83% (2026-06), largest single step -11.8pp in 2026-02.
China's lower duty (3.98% vs 8.83%) lets it price up to 4.7% above Korea, South at the factory and still match on duty-inclusive customs cost. But on the LATEST measured prices, China actually lands cheaper — $10.71/kg vs $19.28/kg (duty in, freight out).
2 Chapter-99 measures name Korea, South; 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 South Korea · the whole tariff ledger · reproduce: tariff_story(hs: "8504.23", origin: "South Korea") via /connect. Not customs or legal advice.