# United States tariff line 8409.91.99.90: Other > In the United States tariff, line 8409.91.99.90 covers suitable for use solely or principally with spark-ignition internal combustion piston engines (including rotary engines). The general (MFN) duty rate is 2.5%. It falls under HS subheading 8409.91 in heading 84.09 (chapter 84). Source: https://border.bot/countries/united-states/hs-codes/8409919990 Last updated: 9 October 2026 [Countries](https://border.bot/countries) / [United States](https://border.bot/countries/united-states) / [Chapter 84](https://border.bot/countries/united-states/hs-codes/84) / [8409.91](https://border.bot/countries/united-states/hs-codes/840991) / [8409.91.99.90](https://border.bot/countries/united-states/hs-codes/8409919990) ## Key facts - Tariff line: 8409.91.99.90 - Covers: Suitable for use solely or principally with spark-ignition internal combustion piston engines (including rotary engines) - Duty (MFN): 2.5% - Preferential rates: From free (17 programmes or origins) - Additional duties: None recorded - Restrictions: None recorded - Tariff: [United States](https://border.bot/countries/united-states) - HS subheading: [8409.91](https://border.bot/hs-codes/840991) ## What this line covers In the United States tariff, line 8409.91.99.90 covers suitable for use solely or principally with spark-ignition internal combustion piston engines (including rotary engines). Its legal text is “Other”, read under “Other”, “Suitable for use solely or principally with spark-ignition internal combustion piston engines (including rotary engines)”, “Other” and “Other”. ## How it is structured It falls under HS subheading 8409.91 in heading 84.09 (chapter 84). The first six digits are the Harmonized System code; the 4 digits after them are added by the United States tariff. - Chapter 84: Nuclear reactors, boilers, machinery and mechanical appliances; parts thereof - Heading 84.09: Parts suitable for use solely or principally with the engines of heading 8407 or 8408 - Subheading 8409.91: Other - Within the subheading: Suitable for use solely or principally with spark-ignition internal combustion piston engines (including rotary engines) - Within the subheading: Other - Within the subheading: Other - Line 8409.91.99.90: Other ## Duty The general (MFN) duty rate is 2.5%. The rate is published on 8409.91.99. Duty-free entry applies to goods that qualify under 16 programmes, and to goods from a group of origins (origin group A*). - Free: a group of origins (origin group A*) (A*) - Free: United States-Australia Free Trade Agreement (AU) - Free: United States-Bahrain Free Trade Agreement Implementation Act (BH) - Free: United States-Chile Free Trade Agreement (CL) - Free: United States-Colombia Trade Promotion Agreement Implementation Act (CO) - Free: African Growth and Opportunity Act (D) - Free: Caribbean Basin Economic Recovery Act (E) - Free: United States-Israel Free Trade Area (IL) - Free: United States-Jordan Free Trade Area Implementation Act (JO) - Free: United States-Korea Free Trade Agreement Implementation Act (KR) - Free: United States-Morocco Free Trade Agreement Implementation Act (MA) - Free: United States-Oman Free Trade Agreement Implementation Act (OM) - Free: Dominican Republic-Central America-United States Free Trade Agreement (P) - Free: United States-Panama Trade Promotion Agreement Implementation Act (PA) - Free: United States-Peru Trade Promotion Agreement Implementation Act (PE) - Free: United States-Mexico-Canada Agreement (S) - Free: United States-Singapore Free Trade Agreement (SG) ## In other countries No other national tariff on border.bot has live lines under 8409.91 yet. - [The Harmonized System text for 8409.91](https://border.bot/hs-codes/840991) ## Other lines under 8409.91 - [8409.91.10.40](https://border.bot/countries/united-states/hs-codes/8409911040) For vehicles of subheading 8701.21, 8701.22, 8701.23, 8701.24 or 8701.29, or heading 8702, 8703 or 8704 - [8409.91.10.60](https://border.bot/countries/united-states/hs-codes/8409911060) For marine propulsion engines - [8409.91.10.80](https://border.bot/countries/united-states/hs-codes/8409911080) Other - [8409.91.30.00](https://border.bot/countries/united-states/hs-codes/8409913000) Aluminum cylinder heads - [8409.91.50.10](https://border.bot/countries/united-states/hs-codes/8409915010) Connecting rods - [8409.91.50.81](https://border.bot/countries/united-states/hs-codes/8409915081) Steel forgings - [8409.91.50.85](https://border.bot/countries/united-states/hs-codes/8409915085) Other - [8409.91.92.10](https://border.bot/countries/united-states/hs-codes/8409919210) Connecting rods - [8409.91.92.90](https://border.bot/countries/united-states/hs-codes/8409919290) Other - [8409.91.99.10](https://border.bot/countries/united-states/hs-codes/8409919910) Connecting rods - Previous line: [8409.91.99.10](https://border.bot/countries/united-states/hs-codes/8409919910) Connecting rods - Next line: [8409.99.10.40](https://border.bot/countries/united-states/hs-codes/8409991040) For vehicles of subheading 8701.21, 8701.22, 8701.23, 8701.24 or 8701.29, or heading 8702, 8703 or 8704 ## Frequently asked questions ### What does tariff line 8409.91.99.90 cover in the United States tariff? In the United States tariff, line 8409.91.99.90 covers suitable for use solely or principally with spark-ignition internal combustion piston engines (including rotary engines). ### What is the general (MFN) duty on 8409.91.99.90 in the United States? The general (MFN) duty rate is 2.5%. The rate is published on 8409.91.99. ### Which preferential rates apply to 8409.91.99.90? Duty-free entry applies to goods that qualify under 16 programmes: the United States-Australia Free Trade Agreement, the United States-Bahrain Free Trade Agreement Implementation Act, the United States-Chile Free Trade Agreement, the United States-Colombia Trade Promotion Agreement Implementation Act, African Growth and Opportunity Act, Caribbean Basin Economic Recovery Act, the United States-Israel Free Trade Area, the United States-Jordan Free Trade Area Implementation Act, the United States-Korea Free Trade Agreement Implementation Act, the United States-Morocco Free Trade Agreement Implementation Act, the United States-Oman Free Trade Agreement Implementation Act, the Dominican Republic-Central America-United States Free Trade Agreement, the United States-Panama Trade Promotion Agreement Implementation Act, the United States-Peru Trade Promotion Agreement Implementation Act, the United States-Mexico-Canada Agreement and the United States-Singapore Free Trade Agreement, and to goods from a group of origins (origin group A*). ## Sources and updates The tariff lines for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026. The duty rates for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026. The trade programmes for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026. This page was last updated on 9 October 2026. Guidance from published tariff data, not a binding ruling. For a decision customs must follow, apply to the destination’s customs authority for a binding tariff ruling. Official source files: - https://hts.usitc.gov/reststop/exportList?from=0000000000&to=9999999999&format=CSV&styles=false Machine-readable: https://border.bot/countries/united-states/hs-codes/8409919990.json