8403.10.00.00
Boilers
Central heating boilers (other than those of heading 8402) and parts thereof
Data provenance: Rates from HTS Revision 19 (Sep 16, 2026); trade measures verified against CBP CSMS and Federal Register notices through Sep 3, 2026.
Duty rates
Column 1 (General / MFN)
Free
Column 2 (Non-NTR)
45%
The rates above are statutory column rates. Trade remedies in Chapter 99 (Section 301, 232, IEEPA, reciprocal) and FTA preferences can change the duty owed on a given entry — see below.
Trade measures (Chapter 99)
9903.82.03
15.0%
ActiveExcept for articles classifiable in chapters 72, 73, 74 or 76, articles where the weight of the applicable metal is less than 15 percent of the weight of the imported article, as provided for in subdivision (c) of U.S. note 16 to this subchapter
Effective from April 6, 2026
9903.82.05
The duty provided in the applicable subheading + 15%
ActiveDerivative aluminum or steel articles the product of the United Kingdom, as provided for in subdivisions (c)(vi)–(vii) and (d) of U.S. note 16 to this subchapter
Applies to origin: GB
Effective from April 6, 2026
9903.82.06
The duty provided in the applicable subheading + 10%
ActiveExcept as provided for in headings 9903.82.15 and 9903.85.68, articles of copper and derivative aluminum and steel articles, as provided for in subdivisions (c)(ii), (iv), (vi)–(viii), (xi) and (e) of U.S. note 16 to this subchapter
Effective from April 6, 2026
9903.82.09
The duty provided in the applicable subheading + 25%
ActiveExcept as provided for in headings 9903.82.16, 9903.82.20–9903.82.26 and 9903.85.68, articles of copper and derivative aluminum and steel articles, as provided for in subdivisions (c)(vi)–(viii) and (xi) of U.S. note 16 to this subchapter
Effective from April 6, 2026
9903.82.13
No change
ActiveMotorcycle parts, as provided for in subdivision (g) of U.S. note 16 to the subchapter
Effective from April 6, 2026
9903.82.15
The duty provided in the applicable subheading + 10%
ActiveArticles of copper and derivative steel the product of the Russian Federation, as provided for in subdivisions (c)(iv), (vii), (viii), (xi) and (e) of U.S. note 16 to this subchapter
Applies to origin: RU
Effective from April 6, 2026
9903.82.16
The duty provided in the applicable subheading + 25%
ActiveArticles of copper and derivative steel the product of the Russian Federation, as provided for in subdivisions (c)(vii)–(viii) and (xi) of U.S. note 16 to this subchapter
Applies to origin: RU
Effective from April 6, 2026
9903.88.15
LIST_3
The duty provided in the applicable subheading + 7.5%
ActiveExcept as provided in headings 9903.88.39, 9903.88.42, 9903.88.44, 9903.88.47, 9903.88.49, 9903.88.51, 9903.88.53, 9903.88.55, 9903.88.57, 9903.88.65, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(r) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(s)
Applies to origin: CN
Effective from September 24, 2018
Rate-change history
What the rate was before, and when it changed. The government schedule replaces each revision in place; we keep the timeline.
-
RATE_INCREASE USITC HTS Revision 2026.7
Rate increase on 9903.82.03: 0% → 15% (Section 232 combined metals)
See the change → -
SCOPE_EXPANSION Proclamation April 2, 2026 - Combined Metals
Section 232 steel scope expanded: 523 HTS codes added under combined-metals framework
See the change → -
NEW_PROGRAM Proclamation April 2, 2026 - Combined Metals
Combined Section 232 metals framework introduced — 16 new Chapter 99 codes (9903.82.02–17)
See the change → -
NEW_PROGRAM Executive Order Feb 1, 2026 — Reciprocal Tariff (FR 2026-03824)
Section 122 reciprocal surcharge in effect — additional 10% on most imports through July 24, 2026
See the change → -
Base rate HTS 2023
Column 1 general rate set to Free.
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Other codes in heading 8403
Duty by origin country
The rate above is the statutory base. Total landed duty depends on origin — see the calculated rate for 8403.10.00.00 from each major US trading partner.
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