2931.44.00.00
Non-halogenated organo-phosphorous derivatives / Methylphosphonic acid
Classification path
- Other organo-inorganic compounds
- Non-halogenated organo-phosphorous derivatives
- Methylphosphonic acid
Rates of duty
- General (MFN)
- 3.7%
- Column 2Cuba, North Korea, Russia, Belarus
- 25%
- Unit of quantity
- kg
Trade agreement rates
Related lines in heading 2931
- 2931.10.00.00Tetramethyl lead and tetraethyl lead3.7%
- 2931.20.00.00Tributyltin compounds3.7%
- 2931.41.00.00Non-halogenated organo-phosphorous derivatives / Dimethyl methylphosphonate3.7%
- 2931.42.00.00Non-halogenated organo-phosphorous derivatives / Dimethyl propylphosphonate3.7%
- 2931.43.00.00Non-halogenated organo-phosphorous derivatives / Diethyl ethylphosphonate3.7%
- 2931.45.00.00Salt of methylphosphonic acid and (aminoiminomethyl)urea (1:1)3.7%
- 2931.46.00.002,4,6-Tripropyl-1,3,5,2,4,6-trioxatriphosphinane 2,4,6-trioxide3.7%
- 2931.47.00.00(5-Ethyl-2-methyl-2-oxido-1,3,2-dioxaphosphinan-5-yl) methyl methyl methylphosphonate3.7%
- 2931.48.00.003,9-Dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro [5.5] undecane 3,9-dioxide3.7%
- 2931.49.00.05O-Alkyl (≤C10, including cycloalkyl) N,N-dialkyl (methyl, ethyl, n-propyl or isopropyl) phosphoramidocyanidates3.7%
- 2931.49.00.08[O-2-(Dialkyl (methyl, ethyl, n-propyl or isopropyl) amino)ethyl] hydrogen alkyl (methyl, ethyl, n-propyl or isopropyl) phosphonites and their O-alkyl (≤C10, including cycloalkyl) esters; alkylated or protonated salts thereof3.7%
- 2931.49.00.102-Amino-4-[hydroxy(methyl)phosphonoyl] butanoic acid (glufosinate) and its salts and esters3.7%
About heading 2931
Other organo-inorganic compounds
Heading 2931 covers separate chemically defined organo-inorganic compounds, meaning molecules with a direct bond between carbon and a metal or other non-carbon element such as phosphorus, silicon, tin, lead or boron. The heading splits into three main blocks: lead and tin compounds at the top, organo-phosphorous derivatives in the middle (split again by whether the compound is halogenated), and a residual 2931.90 group for other compounds, which is divided first by aromatic versus other and then by end use such as drugs, pesticides or organo-silicon and organo-tin types.
Full guide to heading 2931Products in this heading
- Glyphosate technical material (N-(phosphonomethyl) glycine)
- Glufosinate and its salts and esters
- Trichlorfon insecticide active ingredient
- Tributyltin compounds
- Tetraethyl lead and tetramethyl lead
- Dibutyltin oxide used as a PVC stabilizer
- Sodium tetraphenylboron
- Organo-silicon compounds such as diphenyldichlorosilane
Frequently asked questions
What is the HTS code for glyphosate?
Glyphosate and its salts and esters fall under 2931.49.00.20, with a general (MFN) rate of 3.7%.
What is the duty on tributyltin compounds?
Tributyltin compounds are classified under 2931.20.00.00 and carry a general (MFN) rate of 3.7%.
How do I classify an organo-phosphorous compound that contains a halogen?
Halogenated organo-phosphorous derivatives go in 2931.51 to 2931.59, for example trichlorfon under 2931.54.00.00 at a general (MFN) rate of 3.7%. If the compound carries no halogen, it goes in 2931.41 to 2931.49, with the residual line 2931.49.00.80 also at a general (MFN) rate of 3.7%.
Source: USITC Harmonized Tariff Schedule, retrieved October 21, 2026.