HS code for engine air filter
The U.S. HS code for an engine air filter is usually 8421.31.00.00 (car), with a 2.5% general duty and an estimated total of 15% from China and 15% from Vietnam once additional duties are added.
Estimates use tariff data as of October 22, 2026. The China and Vietnam estimates include Section 301: Forced labor action (12.5%). From China, Section 301: China list duty (7.5% or 25%) may also apply, up to 40% in total. Classifications and duty estimates are guidance based on the published HTSUS. The importer of record is responsible for the final classification.
Codes by variant
| Variant | HTS code | General duty | Est. from China |
|---|---|---|---|
| Car | 8421.31.00.00 | 2.5% | 15% |
- 8421.31.00.00: Intake air filters for internal combustion engines
What decides the code
An engine air filter is filtering machinery for gases, classified as an intake air filter for internal combustion engines under 8421.31.00.00.
- The product filters air, a gas, so it falls in heading 8421 as filtering or purifying machinery and apparatus for gases.
- It is an intake air filter for an internal combustion engine, which places it in subheading 8421.31.
- A filter sold as a replacement part for a car engine stays in 8421.31.00.00 because the subheading covers intake air filters for internal combustion engines.
Common mistakes
- Classifying the filter under 8421.39, which covers other gas filtering apparatus, is wrong because 8421.31 specifically covers intake air filters for internal combustion engines.
- Classifying it as an engine part under heading 8409 is wrong because the filter is filtering machinery of heading 8421, not a part of the engine itself.
- Classifying it under 8421.21, which covers filtering machinery for liquids, is wrong because the filter cleans air, a gas.
Estimated U.S. duty by origin
- China
- 15% = 2.5% general + 12.5% Section 301: Forced labor actionMay also apply: Section 301: China list duty (7.5% or 25%). Up to 40%.
- Vietnam
- 15% = 2.5% general + 12.5% Section 301: Forced labor action
For HTS 8421.31.00.00, as a share of customs value, before fees. Check every measure for your entry with the tariff checker.
EU code and duty
- Car
- CN 8421 31 00, 1.7%
EU Combined Nomenclature 2026, third-country (erga omnes) duty. Preferential rates and EU trade remedy duties are not included.
Frequently asked questions
What is the HS code for an engine air filter?
The U.S. HTS code for an engine air filter is usually 8421.31.00.00 (car). The first six digits, 8421.31, are the international HS code.
What is the U.S. import duty on an engine air filter from China?
The U.S. general duty on HTS 8421.31.00.00 is 2.5%. With the additional duties that apply to goods of China (Section 301: Forced labor action (12.5%)), the estimated total is 15% of customs value. Section 301: China list duty (7.5% or 25%) may also apply depending on the exact product. From Vietnam the estimate is 15%. Tariff data as of October 22, 2026.
Tariff schedule pages
Related products
Codes checked against the USITC Harmonized Tariff Schedule retrieved October 22, 2026. Additional duties reviewed October 22, 2026. This is an estimate: the importer of record is responsible for classification.