Harmonized Tariff Schedule of the United States · HTS code · HS 8421.31

8421.31.00

8421.31.00: Intake air filters for internal combustion engines

Engine intake air filters

Not declarable on its own: use one of its 1 subdivisions Data: Harmonized Tariff Schedule of the United States · checked on 24 October 2026

  1. 8421 Centrifuges, including centrifugal dryers; filtering or purifying machinery and apparatus, for liquids or gases; parts thereof:
  2. Filtering or purifying machinery and apparatus for gases:
  3. 8421.31.00 Intake air filters for internal combustion engines

What you pay

Importing into USA

Customs duty 2.5% standard rate depends on the country of origin
Additional duties and charges 1 additional measure
VAT no federal VAT; a Merchandise Processing Fee of 0.3464 % is charged on formal entries
Duty calculatorCalculate duty and taxes →

US additional duties of HTS chapter 99 in force on 22 October 2026 are included (Section 301, 232, 338 and 201). IEEPA duties are no longer collected after the Supreme Court ruling of February 2026. Conditional exemptions (US content, end use, metal share) are not computed: check the provision.

Additional duties and import rules

Charges on top of the customs duty, and rules the goods must meet at the border.

Additional duties and charges 1

  • Additional dutySection 301 — China — technology transfer, IP and innovation (2018 actions and 2024 four-year review) 25%
    Applies to goods from
    China
    In force
    from 24 September 2018
    Legal act
    HTSUS 9903.88.03

Preferential rates by country

Agreement or schemeCountriesRate
General (MFN)—2.5%
US–Australia FTA AUAustraliaFree
US–Bahrain FTA BHBahrainFree
US–Chile FTA CLChileFree
US–Colombia TPA COColombiaFree
US–Israel FTA ILIsraelFree
US–Jordan FTA JOJordanFree
US–Korea FTA KRSouth KoreaFree
US–Morocco FTA MAMoroccoFree
US–Oman FTA OMOmanFree
CAFTA-DR PCosta Rica, Dominican Republic, El Salvador, Guatemala, Honduras, NicaraguaFree
US–Panama TPA PAPanamaFree
US–Peru TPA PEPeruFree
USMCA SCanada, MexicoFree
US–Singapore FTA SGSingaporeFree
Column 2Cuba, North Korea, Russia, Belarus35%

Special: reduced rates under trade agreements and preference programmes; the letters in brackets name the programmes (for example AU = Australia FTA, KR = Korea FTA).

Same subheading in other tariffs

8421.31 Intake air filters for internal combustion engines

UK Free Third-country duty 2 tariff lines EU 1.7% Third-country duty 1 tariff line Türkiye Free – 1.7% Third-country duty 2 tariff lines · average 0.9% Canada Free General (MFN) 3 tariff lines Mexico Free – 5% General (MFN) 3 tariff lines · average 1.7% Brazil 16% General (MFN) 1 tariff line Argentina 16% General (MFN) 1 tariff line Peru Free General (MFN) 1 tariff line New Zealand 5% General (MFN) 1 tariff line Japan Free General (MFN) 1 tariff line Taiwan 5% – 10% General (MFN) 4 tariff lines · average 6.3% GCC 5% General (MFN) 1 tariff line Switzerland Free General (MFN) 1 tariff line Norway Free General (MFN) 1 tariff line North Macedonia 1.7% General (MFN) 1 tariff line Nigeria 5% General (MFN) 1 tariff line

Binding rulings for similar goods

Decisions of U.S. Customs and Border Protection (CROSS) and HMRC (Advance Tariff Rulings) on goods classified here. A ruling binds only its holder, but shows how the authorities classify similar goods. The descriptions are the authorities’ own, in English.

  • 600015053 HMRC 11 March 2026 – 10 March 2029 · 8421 31 00 90

    An Engine Intake Air Filter designed to clean air intake and provide optimum protection for the engine. The filter media is primarily pleated paper based or synthetic non-woven media. Primarily consists of a polyurethane outer seal with the filter media below. Occasionally can have either metal…

Legal notes

Chapter notes: Chapter 84 →

In the Harmonized Tariff Schedule of the United States, 8421.31.00 is one of 1 line under subheading 8421.31, intake air filters for internal combustion engines.

The general duty is 2.5%, and quantities are declared in p/st.

For the same subheading, the UK duty is free, the EU duty is 1.7%, the Türkiye duty is 0%–1.7%, the Canada duty is free, the Mexico duty is 0%–5%, the Brazil duty is 16%, the Argentina duty is 16%, the Peru duty is free, the New Zealand duty is 5%, the Japan duty is free, the Taiwan duty is 5%–10%, the GCC duty is 5%, the Switzerland duty is free, the Norway duty is free, the North Macedonia duty is 1.7% and the Nigeria duty is 5%.

The United States imported goods of subheading 8421.31 worth US$649m in 2024; the largest supplier was Mexico.

Questions and answers

What is the USA import duty for HTS code 8421.31.00?

The general duty in the Harmonized Tariff Schedule of the United States is 2.5%; the supplementary unit is p/st. Preferential rates for goods from agreement countries, anti-dumping duties and VAT are not included.

Is there a lower rate for 8421.31.00 under US trade agreements?

Yes. The Special column reads “Free (A, AU,B, BH,C, CL, CO,D,E, IL, JO, KR, MA, OM,P, PA, PE,S, SG)”: the letters in brackets name the agreements and programmes that grant it.

Where does the United States import these goods from?

For subheading 8421.31 as a whole, the largest supplier in 2024 was Mexico (US$261m), followed by China.

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Typical products

Everyday names, not part of the legal text.