HS 293143 Diethyl ethylphosphonate
Quick Answer: HS code 2931.43 specifically covers Diethyl ethylphosphonate, an organo-phosphorus compound primarily used as a chemical intermediate in various industrial applications, including the synthesis of pharmaceuticals, pesticides, and flame retardants. Importers and exporters should note the varying duty rates across major jurisdictions. In the UK, the standard Most Favoured Nation (MFN) duty rate is 6.00% ad valorem. The European Union (EU) applies an MFN rate of 6.50% ad valorem. For the United States, the MFN duty rate is 3.7% ad valorem, with preferential duty-free treatment available under various Free Trade Agreements (FTAs) for eligible goods from countries such as Australia, Korea, and Mexico. A Column 2 duty rate of 25% applies to products from non-MFN countries. Accurate classification is crucial to ensure compliance and optimize duty payments.
What Are the Import Duty Rates?
🇬🇧 United Kingdom
| Code | MFN | Preferential | Unit |
|---|---|---|---|
| 2931430000 | 6.00 % | — | — |
🇪🇺 European Union (TARIC)
| Code | MFN | Preferential | Unit |
|---|---|---|---|
| 2931430000 | 6.50 % | — | — |
🇺🇸 United States (HTSUS)
| Code | MFN | Preferential | Unit |
|---|---|---|---|
| 2931430000 | 3.7% | Free (18 programs) | ["kg"] |
Special rates available under trade agreements including USMCA, KORUS, GSP.
Duty rates sourced from the USITC (US International Trade Commission) Harmonized Tariff Schedule (HTS) (accessed 2/22/2026), EU TARIC – DG TAXUD (Directorate-General for Taxation and Customs Union) (accessed 2/22/2026), and UK Trade Tariff – HMRC (His Majesty's Revenue and Customs) (accessed 2/22/2026).
Data compiled and presented by HSRates.
Which Trade Agreements Reduce Duties for HS 2931.43?
Imports of Diethyl ethylphosphonate may qualify for reduced or zero duty rates under free trade agreements and preferential programs. The overview below shows available preferential arrangements by jurisdiction, compiled by HSRates from official tariff and trade agreement data.
United States (HTSUS)
Free for USMCA, KORUS, GSP, and 15 other programs
European Union (TARIC)
Preferential rate data not yet available.
United Kingdom
Preferential rate data not yet available.
Preferential rates require proof of origin and may be subject to quotas or conditions. Always verify eligibility with a licensed customs broker.
Data compiled by HSRates.
Which Preferential Rates Apply to Your Origin Country?
Select an origin country to see if preferential rates apply.
Preferential rates based on available trade agreements. Actual rates may vary.
How Has Trade Volume Developed?
Trade Volume 2023
How to Classify This HS Code?
What products does HS 293143 cover?
This subheading covers Diethyl ethylphosphonate, a specific organo-phosphorus compound. According to the Harmonized System Nomenclature, specifically Chapter 29, which deals with organic chemicals, and Heading 2931, which encompasses other organo-inorganic compounds, this particular chemical is precisely defined by its chemical structure. Diethyl ethylphosphonate (CAS No. 78-38-6) is an ester of ethylphosphonic acid and ethanol, characterized by the presence of a phosphorus atom directly bonded to a carbon atom within an organic molecule. This precise chemical identity is consistently recognized across official tariff schedules such as the USITC Harmonized Tariff Schedule of the United States (HTSUS) and the EU TARIC system.
What falls outside HS 293143?
The following products are excluded from HS 293143: other organo-phosphorus compounds that do not match the specific chemical structure of diethyl ethylphosphonate. For instance, triethyl phosphate (CAS No. 78-40-0), which is an ester of phosphoric acid, would be classified under a different subheading within Heading 2919, "Phosphoric esters and their salts; their halogenated, sulfonated, nitrated or nitrosated derivatives." Similarly, dimethyl methylphosphonate (CAS No. 756-79-6) would fall under another specific subheading within Heading 2931, as it is a different phosphonate ester. Products containing phosphorus but lacking the direct phosphorus-carbon bond, such as inorganic phosphates, are classified in Chapter 28.
What are common classification mistakes for HS 293143?
A common error is misidentifying the specific phosphonate ester, leading to incorrect classification within Heading 2931 or even outside it. Importers sometimes confuse diethyl ethylphosphonate with other phosphonates or phosphates due to similar names or applications, failing to precisely verify the chemical structure. For example, classifying triethyl phosphate under 293143 instead of 2919 is a frequent mistake. This often stems from an insufficient understanding of the chemical nomenclature and the precise scope of the subheadings, violating General Interpretative Rule (GRI) 1, which mandates classification according to the terms of the headings and any relative section or chapter notes.
How should importers classify products under HS 293143?
The correct procedure for classifying products as Diethyl ethylphosphonate under HS 293143 involves a meticulous review of the chemical's identity, including its Chemical Abstracts Service (CAS) number and full chemical name. Importers and customs brokers should obtain a Certificate of Analysis (CoA) or Safety Data Sheet (SDS) from the manufacturer, which clearly states the chemical composition and purity. This documentation should explicitly confirm the product is Diethyl ethylphosphonate (CAS No. 78-38-6). Cross-referencing this information with the WCO Harmonized System Explanatory Notes for Chapter 29 and Heading 2931, as well as official tariff databases like the USITC HTSUS or EU TARIC, ensures accurate classification and compliance with international trade regulations.
Which HS Codes Are Related?
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FAQ
What is the Most Favored Nation (MFN) import duty rate for HS code 2931.43 (Diethyl ethylphosphonate) in the United States, European Union, and United Kingdom?
For the United States, under the Harmonized Tariff Schedule of the United States (HTSUS), the MFN (General) duty rate for HS 2931.43.00.00 is typically 6.5% ad valorem. In the European Union, according to the TARIC database, the MFN (Third Country) duty rate for HS 2931 43 00 is generally 6.00% ad valorem. For the United Kingdom, as per the UK Global Tariff, the MFN duty rate for HS 2931 43 00 00 is also 6.00% ad valorem. Importers should always verify the current rates on the official USITC HTSUS, EU TARIC, or UK Trade Tariff websites, respectively, as rates can be subject to change.
Which preferential trade agreements offer duty-free entry for Diethyl ethylphosphonate (HS 2931.43) into the United States?
For imports into the United States, Diethyl ethylphosphonate (HS 2931.43) may qualify for duty-free entry under several U.S. Free Trade Agreements (FTAs) or preferential programs, provided all rules of origin requirements are met. Specific programs and agreements that often grant 'Free' status (indicated by special program indicators like A, AU, BH, CL, CO, D, E, IL, JO, K, KR, MA, OM, P, PA, PE, S, SG in the HTSUS) include, but are not limited to: the Generalized System of Preferences (GSP) for eligible developing countries (A, A+), agreements with Australia (AU), Bahrain (BH), Chile (CL), Colombia (CO), Dominican Republic-Central America (CAFTA-DR) (D), Israel (IL), Jordan (JO), Korea (KR), Morocco (MA), Oman (OM), Panama (PA), Peru (PE), and Singapore (SG). Importers must ensure they have the correct documentation, such as a certificate of origin, to claim these preferential rates.
What are the key classification criteria for Diethyl ethylphosphonate under HS 2931.43, and what distinguishes it from other organo-phosphorus compounds?
HS code 2931.43 specifically covers 'Diethyl ethylphosphonate'. This classification falls under Chapter 29 of the Harmonized System, which deals with 'Organic chemicals'. Within Chapter 29, heading 2931 covers 'Other organo-inorganic compounds'. The key classification criterion for 2931.43 is the precise chemical structure: it must be diethyl ethylphosphonate. This distinguishes it from other organo-phosphorus compounds, which would be classified under other subheadings within 2931 (e.g., 2931.39 for other organo-phosphorus compounds not elsewhere specified) or other headings depending on their specific functional groups and structures. The WCO Explanatory Notes for Chapter 29 and heading 2931 provide detailed guidance on the chemical specificity required for classification.
Are there any specific documentation requirements or regulatory considerations for importing Diethyl ethylphosphonate (HS 2931.43)?
Beyond standard customs documentation (commercial invoice, packing list, bill of lading/airway bill), importers of Diethyl ethylphosphonate (HS 2931.43) should be aware of potential regulatory requirements due to its chemical nature. While not specifically listed as a Schedule 1, 2, or 3 chemical under the Chemical Weapons Convention (CWC), organo-phosphorus compounds can be subject to various national chemical control regulations. In the U.S., this may involve agencies like the Environmental Protection Agency (EPA) under the Toxic Substances Control Act (TSCA) or the Department of Homeland Security (DHS) for Chemical Facility Anti-Terrorism Standards (CFATS). In the EU, REACH regulations (Registration, Evaluation, Authorisation and Restriction of Chemicals) may apply, requiring registration or notification. Importers should verify if the substance is listed on national chemical inventories, requires specific import permits, or is subject to end-use declarations. Consulting with a customs broker experienced in chemical imports is highly recommended.