Importers of HS 6403.91 (welt footwear) from Vietnam actually paid 18.42% on the taxed portion of the value in 2026-06 — 18.21% across everything shipped, taxed or not. Measured from official duty receipts, not the rulebook: the statutory MFN base rate on this code is 5%. Over the window the rate on the taxed portion moved 8.82% → 18.42%, with the largest single step -7.6pp in 2026-03. Measured from official US duty receipts · as-of 2026-06 · confidence: measured, not modelled. The HTS base rate is 5% — importers actually paid 18.42%, so the trade-war overlay added 13.4 pts, measured at the border (not a summed rulebook estimate). Reproduce exactly: tariff_story(hs: "6403.91", origin: "Vietnam") · see it at trimtabist.com/tariffs
HS 6403.91. The schedule base rate is 5%; importers from Vietnam actually paid 18.42% on the dutiable value in 2026-06 — the trade-war overlay added 13.4 points, measured at the border. Measured, not modelled.
Over the window the collected rate moved 8.82% (2023-07) → 18.42% (2026-06), largest single step -7.6pp in 2026-03.
Vietnam's lower duty (18.21% vs 25.33%) lets it price up to 6% above China at the factory and still match on duty-inclusive customs cost. But on the LATEST measured prices, China actually lands cheaper — $17.66/kg vs $20.52/kg (duty in, freight out).
All goods from Vietnam · the whole tariff ledger · reproduce: tariff_story(hs: "6403.91", origin: "Vietnam") via /connect. Not customs or legal advice.