Harmonized Tariff Schedule of the United States · HTS code · HS 2621.90
2621.90.00: Other slag and ash, including seaweed ash: other
Not declarable on its own: use one of its 1 subdivisions Data: Harmonized Tariff Schedule of the United States · checked on 24 October 2026
- 2621 Other slag and ash, including seaweed ash (kelp); ash and residues from the incineration of municipal waste:
- 2621.90.00 Other
What you pay
Importing into USA
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
Same subheading in other tariffs
2621.90 Other slag and ash, including seaweed ash: other
UK Free Third-country duty 1 tariff line 
EU Free Third-country duty 1 tariff line 
Türkiye Free Third-country duty 3 tariff lines 
Canada Free Third-country duty 1 tariff line 
Mexico Free Third-country duty 1 tariff line 
Brazil 3.6% Third-country duty 2 tariff lines 
Argentina 3.6% Third-country duty 2 tariff lines 
Peru Free Third-country duty 1 tariff line 
New Zealand Free Third-country duty 3 tariff lines 
Japan Free Third-country duty 1 tariff line 
Taiwan Free Third-country duty 2 tariff lines 
GCC 5% Third-country duty 7 tariff lines 
Switzerland Free Third-country duty 1 tariff line 
Norway Free Third-country duty 1 tariff line 
North Macedonia Free Third-country duty 1 tariff line 
Nigeria 5% Third-country duty 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.
- N332274 U.S. CBP
The tariff classification of rice hull (husk) ash from India
Legal notes
Notes
1. This chapter does not cover:
(a) slag or similar industrial waste prepared as macadam (heading 2517);
(b) natural magnesium carbonate (magnesite), whether or not calcined (heading 2519);
(c) sludges from the storage tanks of petroleum oils, consisting mainly of such oils (heading 2710);
(d) basic slag of Chapter 31;
(e) slag wool, rock wool or similar mineral wools (heading 6806);
(f) waste or scrap of precious metal or of metal clad with precious metal; other waste or scrap containing precious metal or precious-metal compounds, of a kind used principally for the recovery of precious metal (heading 7112 or 8549); or
(g) copper, nickel or cobalt mattes produced by any process of smelting (Section XV).
2. For the purposes of headings 2601 to 2617, the term ‘ores’ means minerals of mineralogical species actually used in the metallurgical industry for the extraction of mercury, of the metals of heading 2844 or of the metals of Section XIV or XV, even if they are intended for non-metallurgical purposes. Headings 2601 to 2617 do not, however, include minerals which have been submitted to processes not normal to the metallurgical industry.
3. Heading 2620 applies only to:
(a) slag, ash and residues of a kind used in industry either for the extraction of metals or as a basis for the manufacture of chemical compounds of metals, excluding ash and residues from the incineration of municipal waste (heading 2621); and
(b) slag, ash and residues containing arsenic, whether or not containing metals, of a kind used either for the extraction of arsenic or metals or for the manufacture of their chemical compounds.
HTS code 2621.90.00 is a line of the Harmonized Tariff Schedule of the United States under HS subheading 2621.90 (other slag and ash, including seaweed ash: other).
The general duty is free, and quantities are declared in t.
For the same subheading, the UK duty is free, the EU duty is free, the Türkiye duty is free, the Canada duty is free, the Mexico duty is free, the Brazil duty is 3.6%, the Argentina duty is 3.6%, the Peru duty is free, the New Zealand duty is free, the Japan duty is free, the Taiwan duty is free, 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 2621.90 worth US$36m in 2024; the largest supplier was Japan.
Questions and answers
What is the USA import duty for HTS code 2621.90.00?
The general duty in the Harmonized Tariff Schedule of the United States is free; the supplementary unit is t. 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 2621.90 as a whole, the largest supplier in 2024 was Japan (US$10m), followed by Canada.