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HSChapter 29
U.S. imports of trimethyl phosphite (HS 292023) totaled $527K in April 2026, traded with 4 countries.
Importers of Trimethyl Phosphite paid $165K in duties in April 2026 — an effective duty rate of 31% on $527K in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: April 2026 dataTrimethyl phosphite (TMP) is a reactive organophosphorus reagent used primarily in the manufacture of pesticides, flame retardants, and specialty polymers. India and China together account for the dominant share of US import supply, with France and Japan rounding out the supplier base. Imports enter under a single tariff line (2920230000), and Chinese-origin material is subject to Section 301 tariff measures, making origin verification a routine compliance step for procurement teams.
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Because India and China are the leading suppliers, and Chinese-origin trimethyl phosphite is subject to Section 301 tariffs, importers must confirm the country of origin with supporting documentation — including manufacturer certificates and, where applicable, substantial transformation analysis — to ensure correct duty assessment.
Trimethyl phosphite is consumed mainly as a chemical intermediate in agrochemical synthesis (particularly organophosphate pesticides), flame retardant production, and specialty polymer stabilizers. Demand tends to track agricultural chemical production cycles and regulatory approvals for new pesticide active ingredients.
Monthly import values over time
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HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 2920230000 | TRIMETHYL PHOSPHITE | $527K | 31.36% | $165K |
TRIMETHYL PHOSPHITE
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2920230000 | TRIMETHYL PHOSPHITE | $76K |
TRIMETHYL PHOSPHITE
190 kg
NUCLEIC ACIDS & SALTS; OTHER HETEROCYCLIC CMP, NES
HS 293499
HETEROCYCLIC COMP W NITROGEN HETERO-ATM ONLY NESOI
HS 293399
POLYPEPTIDE PROTEIN& GLYCOPROTEIN HORMONES &DERIV
HS 293719
CMPDS CONT AN UNFUSED PYRIDINE RING ETC NESOI
HS 293339
COMP WITH PYRIMIDINE OR PIPERAZINE RING, NESOI
HS 293359
ANTIBIOTICS, NESOI
HS 294190
| State | Imports | Exports | Balance |
|---|---|---|---|
| California | $242K | -- | -$242K |
| North Carolina | $155K | -- | -$155K |
| South Carolina | $131K | -- | -$131K |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| CHARLESTON, SC | $286K | -- | -$286K |
| MOBILE, AL | $242K | -- | -$242K |
| NEW YORK, NY | -- | $64K | +$64K |