Importers of HS 8481.80 (of copper) from Taiwan actually paid 13.88% on the taxed portion of the value in 2026-06 — 13.82% across everything shipped, taxed or not. Measured from official duty receipts, not the rulebook: the statutory MFN base rate on this code is 4%. Over the window the rate on the taxed portion moved 3.73% → 13.88%, with the largest single step -7.7pp in 2026-03. Measured from official US duty receipts · as-of 2026-06 · confidence: measured, not modelled. The HTS base rate is 4% — importers actually paid 13.88%, so the trade-war overlay added 9.9 pts, measured at the border (not a summed rulebook estimate). Reproduce exactly: tariff_story(hs: "8481.80", origin: "Taiwan") · see it at trimtabist.com/tariffs
HS 8481.80. The schedule base rate is 4%; importers from Taiwan actually paid 13.88% on the dutiable value in 2026-06 — the trade-war overlay added 9.9 points, measured at the border. Measured, not modelled.
Over the window the collected rate moved 3.73% (2023-07) → 13.88% (2026-06), largest single step -7.7pp in 2026-03.
Taiwan's lower duty (13.82% vs 38.66%) lets it price up to 21.8% above China at the factory and still match on duty-inclusive customs cost. But on the LATEST measured prices, China actually lands cheaper — $9.64/kg vs $18.95/kg (duty in, freight out).
All goods from Taiwan · the whole tariff ledger · 15 CBP rulings cite this code · reproduce: tariff_story(hs: "8481.80", origin: "Taiwan") via /connect. Not customs or legal advice.