Importers of HS 3907.61 (having a viscosity number of 78 ml/g or higher) from Thailand actually paid 16.5% on the taxed portion of the value in 2026-06 — 16.5% across everything shipped, taxed or not. Measured from official duty receipts, not the rulebook: the statutory MFN base rate on this code is 6.5%. Over the window the rate on the taxed portion moved 6.5% → 16.5%, with the largest single step +9.9pp in 2025-08. Measured from official US duty receipts · as-of 2026-06 · confidence: measured, not modelled. The HTS base rate is 6.5% — importers actually paid 16.5%, so the trade-war overlay added 10 pts, measured at the border (not a summed rulebook estimate). Reproduce exactly: tariff_story(hs: "3907.61", origin: "Thailand") · see it at trimtabist.com/tariffs
HS 3907.61. The schedule base rate is 6.5%; importers from Thailand actually paid 16.5% on the dutiable value in 2026-06 — the trade-war overlay added 10 points, measured at the border. Measured, not modelled.
Over the window the collected rate moved 6.5% (2023-07) → 16.5% (2026-06), largest single step +9.9pp in 2025-08.
All goods from Thailand · the whole tariff ledger · 2 CBP rulings cite this code · reproduce: tariff_story(hs: "3907.61", origin: "Thailand") via /connect. Not customs or legal advice.