Importers of HS 8504.40 (suitable for physical incorporation into automatic data proc) from Vietnam actually paid 9.98% on the taxed portion of the value in 2026-06 — 9.05% across everything shipped, taxed or not. Measured from official duty receipts, not the rulebook: the statutory MFN base rate on this code is Free. Over the window the rate on the taxed portion moved null% → 9.98%, with the largest single step +10.2pp in 2025-04. Measured from official US duty receipts · as-of 2026-06 · confidence: measured, not modelled. The HTS base rate is Free — importers actually paid 9.98%, so the trade-war overlay added 10 pts, measured at the border (not a summed rulebook estimate). Reproduce exactly: tariff_story(hs: "8504.40", origin: "Vietnam") · see it at trimtabist.com/tariffs
HS 8504.40. The schedule base rate is Free; importers from Vietnam actually paid 9.98% 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 % (2023-07) → 9.98% (2026-06), largest single step +10.2pp in 2025-04.
Vietnam's lower duty (9.05% vs 33.49%) lets it price up to 22.4% above China at the factory and still match on duty-inclusive customs cost. But on the LATEST measured prices, Vietnam actually lands cheaper — $14.74/kg vs $29.14/kg (duty in, freight out).
2 Chapter-99 measures name Vietnam; scope mapping is partial (several annexes are PDFs) — absence never means exemption. They do not sum, and some are product-specific — the collected rate above is the composed truth.
All goods from Vietnam · the whole tariff ledger · 20 CBP rulings cite this code · reproduce: tariff_story(hs: "8504.40", origin: "Vietnam") via /connect. Not customs or legal advice.