HS 293430 Compounds containing in the structure a phenothiazine ring-system (whether or not hydrogenated), not further fused
Quick Answer: HS code 293430 covers chemical compounds characterized by a phenothiazine ring-system in their molecular structure, which may or may not be hydrogenated, and not further fused with other ring systems. This includes various pharmaceutical intermediates and active pharmaceutical ingredients (APIs) often used in antipsychotic and antihistamine medications. Importers and customs brokers should note the significant variation in duty rates. For example, the UK Trade Tariff shows rates ranging from 0.00% to 6.00% ad valorem, while the EU TARIC system indicates rates between 0.00% and 6.50% ad valorem. The US Harmonized Tariff Schedule (HTSUS) presents a broader range, including "Free" rates, 6.5% ad valorem, and specific compound rates such as 15.4¢/kg + 52% ad valorem. Precise classification at the 8-digit or 10-digit level is critical to determine the exact applicable duty and ensure compliance.
What Are the Import Duty Rates?
🇬🇧 United Kingdom
| Code | MFN | Preferential | Unit |
|---|---|---|---|
| 2934300000 | — | — | — |
| 2934309000 | — | — | — |
| 2934309090 | 0.00 % | — | — |
| 2934301000 | 0.00 % | — | — |
| 2934309010 | 6.00 % | — | — |
🇪🇺 European Union (TARIC)
| Code | MFN | Preferential | Unit |
|---|---|---|---|
| 2934300000 | — | — | — |
| 2934301000 | 0.00 % | — | — |
| 2934309000 | — | — | — |
| 2934309010 | 6.50 % | — | — |
| 2934309090 | 0.00 % | — | — |
🇺🇸 United States (HTSUS)
| Code | MFN | Preferential | Unit |
|---|---|---|---|
| 293430 | — | — | — |
| 2934301800 | Free | — | ["kg"] |
| 2934302700 | 6.5% | Free (18 programs) | ["kg"] |
| 2934304300 | 6.5% | Free (18 programs) | ["kg"] |
| 2934301200 | 6.5% | Free (17 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 2934.30?
Imports of Compounds containing in the structure a phenothiazine ring-system (whether or not hydrogenated), not further fused 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, and 16 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 to Classify This HS Code?
What products does HS 293430 cover?
This subheading covers chemical compounds that incorporate a phenothiazine ring-system within their molecular structure, provided this ring-system is not further fused with additional rings. The phenothiazine ring itself is a tricyclic compound containing sulfur and nitrogen atoms within a central six-membered ring, flanked by two benzene rings. This classification is consistent with the World Customs Organization's Harmonized System Nomenclature Explanatory Notes for Heading 2934, which specifically identifies compounds containing a phenothiazine ring-system. Examples include unadulterated phenothiazine itself, as well as derivatives where the phenothiazine core remains intact without further ring fusion, as defined by the USITC Harmonized Tariff Schedule of the United States (HTSUS) and the EU TARIC system.
What falls outside HS 293430?
The following products are excluded from HS 293430: compounds where the phenothiazine ring-system is further fused with additional rings, as these would typically fall under other subheadings within Chapter 29 or potentially Chapter 30 if prepared as medicaments. For instance, compounds that are specifically prepared as medicaments, even if they contain a phenothiazine ring, are generally classified under Chapter 30, such as subheading 3004. Additionally, heterocyclic compounds containing only oxygen or nitrogen hetero-atoms, or other specific hetero-atoms not forming a phenothiazine ring-system, would be classified under other appropriate subheadings within Heading 2934 or other headings in Chapter 29 based on their specific chemical structure and functional groups.
What are common classification mistakes for HS 293430?
A common error is misclassifying phenothiazine derivatives that are prepared as medicaments under HS 293430, when they should correctly be classified under Chapter 30, specifically subheading 3004, if they are put up in measured doses or for retail sale as medicaments. Another frequent mistake involves overlooking the "not further fused" criterion, leading to the incorrect inclusion of compounds where the phenothiazine ring-system has additional fused rings, which would fall outside this specific subheading. Importers sometimes also fail to apply General Interpretative Rule (GRI) 1, which dictates that classification is determined according to the terms of the headings and any relative section or chapter notes, leading to misinterpretations of the structural requirements for this subheading.
How should importers classify products under HS 293430?
The correct procedure for classifying products under HS 293430 involves a meticulous review of the chemical structure to confirm the presence of a phenothiazine ring-system and, crucially, to verify that this system is "not further fused." Importers and customs brokers should first consult the World Customs Organization's Harmonized System Nomenclature and its Explanatory Notes for Heading 2934. Next, cross-reference with the specific national tariff schedules, such as the USITC HTSUS or the EU TARIC, to ensure alignment with national interpretations. If the product is a medicament, even if it contains a phenothiazine ring, a careful assessment under Chapter 30 notes is essential to determine if it should be classified there instead, applying GRI 3(a) if necessary to determine the most specific heading. Always maintain detailed chemical analysis reports and safety data sheets (SDS) to substantiate the classification.
Which HS Codes Are Related?
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FAQ
What are the typical Most Favored Nation (MFN) duty rates for products classified under HS 2934.30 in major importing regions?
The MFN duty rates for compounds containing a phenothiazine ring-system (HS 2934.30) vary significantly by importing country or customs union. For example, the United States generally applies a 'Free' duty rate (0.00% ad valorem) under the Harmonized Tariff Schedule of the United States (HTSUS) for MFN countries. The European Union's TARIC database often shows a 6.5% ad valorem duty rate for many products under this heading. The UK Global Tariff also frequently lists a 6.5% ad valorem rate. However, some countries may apply higher rates, such as 15.4¢/kg + 52% or a flat 6.00% or 6.50% ad valorem, depending on their specific tariff schedules. Importers should always consult the official tariff schedule of the destination country, such as the USITC HTSUS, EU TARIC, or UK Trade Tariff, for the most accurate and up-to-date information.
What are the key classification criteria for determining if a compound falls under HS 2934.30?
The primary classification criterion for HS 2934.30, as per the Harmonized System Explanatory Notes (HSENs) to Chapter 29, is the presence of a 'phenothiazine ring-system' within the chemical structure. This heading specifically covers heterocyclic compounds where the phenothiazine ring is present and is 'not further fused' with other ring systems. This means the core phenothiazine structure (a tricyclic compound with sulfur and nitrogen atoms in the central ring) must be identifiable and not part of a more complex, fused polycyclic system that would merit classification elsewhere. Importers and customs brokers should ensure that chemical analysis or structural diagrams clearly confirm the presence of this specific ring system and the absence of further fusion that would alter its fundamental character for classification purposes.
Are there common trade agreements that offer preferential duty rates for HS 2934.30, and what documentation is required to claim them?
Yes, many trade agreements can offer preferential duty rates, often resulting in 0.00% ad valorem (Free) duties, for products classified under HS 2934.30, provided they meet the respective rules of origin. For instance, products originating from countries party to agreements like the USMCA (United States-Mexico-Canada Agreement), EU-Japan EPA, or various Free Trade Agreements (FTAs) with the UK may qualify. To claim preferential treatment, importers typically need to provide a valid Certificate of Origin or an Origin Declaration (e.g., a USMCA Certification of Origin, EUR.1 movement certificate, or an invoice declaration). This documentation must attest that the goods meet the origin requirements specified in the trade agreement, which often involves criteria related to where the product was wholly obtained or underwent substantial transformation. Customs brokers should verify the specific origin rules for HS 2934.30 under the relevant agreement.
What specific documentation, beyond standard shipping documents, might be required for importing chemical compounds under HS 2934.30?
Beyond standard shipping documents like the commercial invoice, packing list, and bill of lading/air waybill, importers of chemical compounds under HS 2934.30 may need to provide additional technical and regulatory documentation. This can include a Certificate of Analysis (CoA) to confirm the chemical composition, purity, and specifications of the compound. A Safety Data Sheet (SDS), formerly Material Safety Data Sheet (MSDS), is often required for hazard communication and regulatory compliance, particularly for chemicals. Depending on the end-use and specific compound, import permits or licenses from regulatory bodies (e.g., EPA, FDA in the US, ECHA in the EU) might be necessary, especially if the compound is a precursor for controlled substances, a pharmaceutical active ingredient, or has specific environmental implications. Importers should consult the relevant national chemical control regulations.
Could HS 2934.30 compounds be subject to anti-dumping or countervailing duties (AD/CVD)?
While not universally applicable to all compounds under HS 2934.30, specific chemical products within this classification could potentially become subject to anti-dumping (AD) or countervailing duties (CVD) if investigations by importing countries determine that they are being dumped (sold below fair value) or unfairly subsidized by exporting countries. These duties are product- and country-specific. Importers should regularly check the official publications of the relevant customs authorities (e.g., U.S. Customs and Border Protection (CBP) AD/CVD search, EU Official Journal, UK Trade Remedies Authority) for any active AD/CVD orders or ongoing investigations pertaining to specific chemicals falling under HS 2934.30 from particular countries of origin. Failure to account for applicable AD/CVD can result in significant penalties and retroactive duty assessments.