Harmonized Tariff Schedule of the United States · HTS code · HS 8404.10

8404.10.00

8404.10.00: Auxiliary plant for use with boilers of heading 8402 or 8403

Not declarable on its own: use one of its 2 subdivisions Data: Harmonized Tariff Schedule of the United States · checked on 24 October 2026

  1. 8404 Auxiliary plant for use with boilers of heading 8402 or 8403 (for example, economizers, super-heaters, soot removers, gas recoverers); condensers for steam or other vapor power units; parts thereof:
  2. 8404.10.00 Auxiliary plant for use with boilers of heading 8402 or 8403

What you pay

Importing into USA

Customs duty 3.5% 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)—3.5%
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, Belarus45%

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

Subdivisions

  1. 8404.10.00 Auxiliary plant for use with boilers of heading 8402 or 8403 3.5%
  2. 8404.10.00.10 Economizers t
  3. 8404.10.00.50 Other t

Same subheading in other tariffs

8404.10 Auxiliary plant for use with boilers of heading 8402 or 8403

UK Free Third-country duty 1 tariff line EU 2.7% Third-country duty 1 tariff line Türkiye 2.7% Third-country duty 7 tariff lines Canada Free Third-country duty 2 tariff lines Mexico Free Third-country duty 1 tariff line Brazil 20% Third-country duty 2 tariff lines Argentina 12.6% Third-country duty 2 tariff lines Peru Free Third-country duty 1 tariff line New Zealand Free Third-country duty 1 tariff line Japan Free Third-country duty 1 tariff line Taiwan 3% Third-country duty 10 tariff lines GCC 5% Third-country duty 1 tariff line Switzerland Free Third-country duty 1 tariff line Norway Free Third-country duty 1 tariff line North Macedonia 15% Third-country duty 1 tariff line Nigeria 5% Third-country duty 1 tariff line

Legal notes

Chapter notes: Chapter 84 →

In the Harmonized Tariff Schedule of the United States, 8404.10.00 is one of 1 line under subheading 8404.10, auxiliary plant for use with boilers of heading 8402 or 8403.

The general duty is 3.5%.

2 statistical sub-lines below it are used in the declaration.

For the same subheading, the UK duty is free, the EU duty is 2.7%, the Türkiye duty is 2.7%, the Canada duty is free, the Mexico duty is free, the Brazil duty is 20%, the Argentina duty is 12.6%, the Peru duty is free, the New Zealand duty is free, the Japan duty is free, the Taiwan duty is 3%, the GCC duty is 5%, the Switzerland duty is free, the Norway duty is free, the North Macedonia duty is 15% and the Nigeria duty is 5%.

The United States imported goods of subheading 8404.10 worth US$68m in 2024; the largest supplier was Canada, and the United Kingdom ranked 4th with US$3m.

Questions and answers

What is the USA import duty for HTS code 8404.10.00?

The general duty in the Harmonized Tariff Schedule of the United States is 3.5%. Preferential rates for goods from agreement countries, anti-dumping duties and VAT are not included.

Is there a lower rate for 8404.10.00 under US trade agreements?

Yes. The Special column reads “Free (A*,AU, BH, 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 8404.10 as a whole, the largest supplier in 2024 was Canada (US$33m), followed by Thailand.

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Typical products

Everyday names, not part of the legal text.