Importers of HS 3923.90 (other) from Taiwan actually paid 12.64% on the taxed portion of the value in 2026-06 — 12.62% across everything shipped, taxed or not. Measured from official duty receipts, not the rulebook: the statutory MFN base rate on this code is 3%. Over the window the rate on the taxed portion moved 3% → 12.64%, with the largest single step -7.5pp in 2026-03. Measured from official US duty receipts · as-of 2026-06 · confidence: measured, not modelled. The HTS base rate is 3% — importers actually paid 12.64%, so the trade-war overlay added 9.6 pts, measured at the border (not a summed rulebook estimate). Reproduce exactly: tariff_story(hs: "3923.90", origin: "Taiwan") · see it at trimtabist.com/tariffs
HS 3923.90. The schedule base rate is 3%; importers from Taiwan actually paid 12.64% on the dutiable value in 2026-06 — the trade-war overlay added 9.6 points, measured at the border. Measured, not modelled.
Over the window the collected rate moved 3% (2023-07) → 12.64% (2026-06), largest single step -7.5pp in 2026-03.
Taiwan's lower duty (12.62% vs 34.25%) lets it price up to 19.2% above China at the factory and still match on duty-inclusive customs cost. But on the LATEST measured prices, China actually lands cheaper — $1.52/kg vs $2.35/kg (duty in, freight out).
All goods from Taiwan · the whole tariff ledger · 7 CBP rulings cite this code · reproduce: tariff_story(hs: "3923.90", origin: "Taiwan") via /connect. Not customs or legal advice.