Importers of HS 8421.23 (oil or fuel filters for internal combustion engines) from Thailand actually paid 25.71% on the taxed portion of the value in 2026-06 — 25.68% across everything shipped, taxed or not. Measured from official duty receipts, not the rulebook: the statutory MFN base rate on this code is 2.5%. Over the window the rate on the taxed portion moved 2.5% → 25.71%, with the largest single step +7pp in 2025-05. Measured from official US duty receipts · as-of 2026-06 · confidence: measured, not modelled. The HTS base rate is 2.5% — importers actually paid 25.71%, so the trade-war overlay added 23.2 pts, measured at the border (not a summed rulebook estimate). Reproduce exactly: tariff_story(hs: "8421.23", origin: "Thailand") · see it at trimtabist.com/tariffs
HS 8421.23. The schedule base rate is 2.5%; importers from Thailand actually paid 25.71% on the dutiable value in 2026-06 — the trade-war overlay added 23.2 points, measured at the border. Measured, not modelled.
Over the window the collected rate moved 2.5% (2023-07) → 25.71% (2026-06), largest single step +7pp in 2025-05.
Thailand's lower duty (25.68% vs 48.85%) lets it price up to 18.4% above China at the factory and still match on duty-inclusive customs cost. But on the LATEST measured prices, China actually lands cheaper — $7.74/kg vs $8.01/kg (duty in, freight out).
All goods from Thailand · the whole tariff ledger · 1 CBP ruling cite this code · reproduce: tariff_story(hs: "8421.23", origin: "Thailand") via /connect. Not customs or legal advice.