Harmonized Tariff Schedule of the U.S. › Chapter 29 Organic chemicals
2931.44.00.00Tariff line
Classification path
Other organo-inorganic compounds
2931
Non-halogenated organo-phosphorous derivatives
Methylphosphonic acid
2931.44.00.00
Rates of duty
General rate (Column 1)3.7%
SpecialFree (A, AU, BH, CL, CO, D, E, IL, JO, K, KR, MA, OM, P, PA, PE, S, SG)
Column 225%
Unitkg
Free (A, AU, BH, CL, CO, D, E, IL, JO, K, KR, MA, OM, P, PA, PE, S, SG)
Printed page 1535
Measure flags
for origin CN, entry date 2026-10-25 · base rate 3.7%
- Section 301 forced-labor tariff (12.5%)9903.05.31Applies+12.5%China: Column 1 rate + 12.5% additional
- China 301: not on any listN/A—8-digit subheading 2931.44.00 is not on Lists 1–4B or the four-year-review lists
- PGAEPA EP5EPA EP7
Confirmed total 16.2% · max 16.2%Full duty breakdown →