HTS 8409 — Parts for internal combustion engines Tariff Rate (2026)

HTS heading 8409 covers parts for internal combustion engines, entering the United States at a 2.5% MFN duty rate. Parts suitable for use solely or principally with internal combustion piston engines. Beyond the base MFN duty, goods under this heading from most non-EU origins add the Section 301 forced-labor tariff (10% standard, 12.5% for the ~28-economy forced-labor tier such as China, Vietnam, and Thailand), which took over from the expired Section 122 rate on July 24, 2026. EU-origin goods are capped at the 15% all-inclusive EU-US deal ceiling instead. Chinese-origin goods add a Section 301 China tariff of 25% on top. Worked example: a $10,000 shipment under HTS 8409 owes about $250 in MFN duty (2.5%); adding the 10% base forced-labor surcharge brings it to roughly $1,250 from a standard-tier origin, or about $1,500 from a 12.5%-tier origin such as China (before that origin's Section 301 China tariff). Check your exact figure with the tariff calculator. The top countries of origin for HTS 8409 imports include MX, JP, DE, CN, CA. Effective duty varies by source country based on trade agreements (USMCA, KORUS) and tariff programs — see the per-country tariff rates by country for how MX compares.