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HTS 2831Dithionites and sulfoxylates

Product or HTS code

Rate lines3

Code	Description	General	Special	Column 2	Units	Calculate
2831.10	2831.10Of sodium
2831.10.10.00	2831.10.10.00Sodium formaldehyde sulfoxylateGeneral Free · Column 2 35% · kg	Free		35%	kg
2831.10.50.00	2831.10.50.00OtherGeneral 5.5% · Special Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) · Column 2 35% · kg	5.5%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	35%	kg
2831.90.00.00	2831.90.00.00OtherGeneral 5.5% · Special Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) · Column 2 35% · kg	5.5%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	35%	kg

2026 HTS Revision 21 (October 9, 2026)

Duty by country of origin

Rate line	Germany59.79% of imports	India18.87% of imports	Belgium9.26% of imports	China5.68% of imports	South Korea3.08% of imports	Canada2.31% of imports	United Kingdom0.72% of imports	Japan0.22% of imports	Italy0.07% of imports
2831.10.10.00Sodium formaldehyde sulfoxylate	10%9903.05.39	10%9903.05.44	10%9903.05.39	37.5%9903.05.319903.88.03	12.5%9903.05.71	10%9903.05.29	10%9903.05.81	12.5%9903.05.49	10%9903.05.39
2831.10.50.00Other	10%9903.05.39	15.5%9903.05.44	10%9903.05.39	43%9903.05.319903.88.03	12.5%9903.05.71	15.5%9903.05.29	15.5%9903.05.81	12.5%9903.05.49	10%9903.05.39
2831.90.00.00Other	10%9903.05.39	15.5%9903.05.44	10%9903.05.39	43%9903.05.319903.88.03	12.5%9903.05.71	15.5%9903.05.29	15.5%9903.05.81	12.5%9903.05.49	10%9903.05.39

Total duty on a $10,000 ocean shipment entered 2026-10-13, before customs fees. Origins are the leading sources of US imports under this heading in 2025 (US Census Bureau).