Harmonized Tariff Schedule of the United States · HTS code · HS 8421.32

8421.32.00

8421.32.00: Catalytic converters or particulate filters, whether or not combined, for purifying or filtering exhaust gases from internal combustion engines

Catalytic converters and particulate 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. 8421.32.00 Catalytic converters or particulate filters, whether or not combined, for purifying or filtering exhaust gases from internal combustion engines

What you pay

Importing into USA

Customs duty Free standard rate depends on the country of origin
Additional duties and charges 7 additional measures
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 7

  • Additional dutySection 232 — Medium- and heavy-duty vehicles, buses and parts 25%
    Applies to goods from
    all countries
    In force
    from 1 November 2025
    Legal act
    HTSUS 9903.74.08
  • Additional dutySection 232 — Passenger vehicles, light trucks and parts 25%
    Applies to goods from
    all countries except Japan, Austria, Belgium, Bulgaria, Croatia, Cyprus, Czechia, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, South Korea, Taiwan
    In force
    from 3 May 2025
    Legal act
    HTSUS 9903.94.05
  • Additional dutySection 232 — Passenger vehicles, light trucks and parts 10%
    Applies to goods from
    United Kingdom
    In force
    from 30 June 2025
    Legal act
    HTSUS 9903.94.32
  • Additional dutySection 232 — Passenger vehicles, light trucks and parts 15%
    Applies to goods from
    Japan
    In force
    from 16 September 2025
    Legal act
    HTSUS 9903.94.43
  • Additional dutySection 232 — Passenger vehicles, light trucks and parts 15%
    Applies to goods from
    Austria, Belgium, Bulgaria, Croatia, Cyprus, Czechia, Denmark, Estonia and 19 more
    In force
    from 25 September 2025
    Legal act
    HTSUS 9903.94.53
  • Additional dutySection 232 — Passenger vehicles, light trucks and parts 15%
    Applies to goods from
    South Korea
    In force
    from 4 December 2025
    Legal act
    HTSUS 9903.94.63
  • Additional dutySection 232 — Passenger vehicles, light trucks and parts 15%
    Applies to goods from
    Taiwan
    In force
    from 1 May 2026
    Legal act
    HTSUS 9903.94.67

Same subheading in other tariffs

8421.32 Catalytic converters or particulate filters, whether or not combined, for purifying or filtering exhaust gases from internal combustion engines

UK Free Third-country duty 2 tariff lines EU 1.7% Third-country duty 1 tariff line Türkiye 1.7% Third-country duty 1 tariff line Canada Free General (MFN) 1 tariff line Mexico Free – 5% General (MFN) 2 tariff lines · average 2.5% Brazil 18% General (MFN) 1 tariff line Argentina 18% General (MFN) 1 tariff line Peru Free General (MFN) 1 tariff line New Zealand Free General (MFN) 1 tariff line Japan Free General (MFN) 1 tariff line Taiwan 4% General (MFN) 1 tariff line GCC 5% General (MFN) 1 tariff line Switzerland Free General (MFN) 1 tariff line Norway Free General (MFN) 1 tariff line North Macedonia Free 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.

  • N351489 U.S. CBP 31 July 2025 · 8421.32.00.00

    The tariff classification of catalytic converters from various countries

  • N333853 U.S. CBP 18 July 2023 · 8421.32.00.00

    The tariff classification and country of origin of a gas particulate filter

Legal notes

Chapter notes: Chapter 84 →

Code history

Since 2022; before, these goods were classified under 8421.39.

HTS code 8421.32.00 is a line of the Harmonized Tariff Schedule of the United States under HS subheading 8421.32 (catalytic converters or particulate filters).

The general duty is free, 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 1.7%, the Canada duty is free, the Mexico duty is 0%–5%, the Brazil duty is 18%, the Argentina duty is 18%, the Peru duty is free, the New Zealand duty is free, the Japan duty is free, the Taiwan duty is 4%, the GCC duty is 5%, the Switzerland duty is free, the Norway duty is free, the North Macedonia duty is free and the Nigeria duty is 5%.

The United States imported goods of subheading 8421.32 worth US$3.3bn in 2024; the largest supplier was Mexico.

Questions and answers

What is the USA import duty for HTS code 8421.32.00?

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

Where does the United States import these goods from?

For subheading 8421.32 as a whole, the largest supplier in 2024 was Mexico (US$2.4bn), followed by Germany.

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Typical products

Everyday names, not part of the legal text.