2831.90.00.00
Dithionites and sulfoxylates:
Other
Source units: kg
- Column 1 — General
- 5.5%
- Column 1 — Special (eligibility required)
- Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)
- Column 2
- 35%
This directory combines historical reference rows with separately labelled national sources. Read the source title, observation date, printed units and conditions on each entry. National source observations do not establish all measures applicable to a shipment.
United States Customs Tariff for HS Code 283190
Dithionites and sulphoxylates; other than sodium
USITC 2026 HTS Revision 19
26,806 official source entries are searchable. Checked 2026-09-22; edition published 2026-09-15.
Printed tariff and statistical lines from this edition, separate from historical WITS averages. Blank duty cells are not a confirmed zero. Review the parent tariff line, general and chapter notes, chapter 99, origin, exclusions, quotas and additional duties. No shipment total or special-rate eligibility is calculated. The edition publication date is not a line-level effective date.
Original source definitions and general notes
Official entries matching 283190
WITS 2023 historical MFN average
Reported average: 5.5%.
Source year: 2023. Classification: HS 2022 (H6). Checked 2026-09-14.
National lines included: 1 of 1. Excluded from the average: 0.
Reported ad-valorem range: 5.5%–5.5%.
Reported historical ad-valorem MFN simple average for 2023, not a national tariff schedule. No preferential rates, additional duties, VAT, excise or import permissions are determined.
Not a current 2026 national duty. The HS6 average does not determine the duty of a particular national subdivision, origin or shipment.
WITS observation for this code and year
UN Comtrade H6 descriptions (HS 2022)
WITS API definitions: reported averages and excluded national lines
Direct HS code answer for United States
United States HS Code 283190: 5.50% (2023 MFN average)
The source reports an indicative HS6 MFN average of 5.50% (2023 MFN average) for Dithionites and sulphoxylates; other than sodium.Source status: not assessed. Verify the exact national tariff line, origin treatment, taxes, restrictions, and current customs guidance before using this information in a declaration.
Customs tariff summary
- Country
- United States
- HS / tariff code
- 283190
- Description
- Dithionites and sulphoxylates; other than sodium
- Chapter
- 28 —
- Heading
- 2831
- Subheading
- 283190
- Indicative MFN HS6 average
- 5.50% (2023 MFN average)
- VAT / tax
- Check local VAT and excise rules for the import destination.
- Unit / basis
- Not listed in this tariff line
- Source / vintage
- WITS / UNCTAD TRAINS — 2023 MFN HS6 reference
Historical MFN average
5.50% (2023 MFN average)
Import permission
not assessed
Import planning
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Details
- HS Code
- 283190
- Chapter
- 28 —
- Heading
- 2831
- Subheading
- 283190
Compare HS code 283190 across GCC countries
Each destination shows its own source label. Oman uses its national schedule; Qatar and UAE entries may cite their separately published references and unresolved exceptions. Other entries retain the historical GCC reference. National codes, duty notes, restrictions and tax treatment can differ; verify with the destination customs authority.
Related HS Codes (Heading 2831)
| HS Code | Description | Duty |
|---|---|---|
| 283110 | Dithionites and sulphoxylates; of sodium | 2.75% (2023 MFN average)WITS 2023 historical MFN average |
Data source: WITS/UNCTAD TRAINS (MFN 2022). Values are indicative HS6 MFN averages, not shipment-specific applied rates. Import permission and restrictions are not assessed. Historical reference rates exclude VAT, excise and other national measures. Separate national entries preserve the columns printed by their source; these are not a complete shipment assessment. Full disclaimer.