HS 381111 Anti-knock preparations
Quick Answer: Anti-knock preparations imported under HS 381111 enter the UK at 4.00%, the EU at 6.50%, and the US at 30% (MFN). This HS code covers chemical products and preparations used to increase the octane number of gasoline, thereby preventing engine knocking. These preparations typically contain organometallic compounds, such as tetraethyllead, though lead-free alternatives are also classified here. Importers should be aware of potential regulatory restrictions or specific labeling requirements depending on the exact composition and jurisdiction. CustomTariffs aggregates this data to assist trade professionals.
What Are the Import Duty Rates?
🇬🇧 United Kingdom
| Code | MFN | Preferential | Unit |
|---|---|---|---|
| 3811110000 | — | — | — |
| 3811119000 | 4.00 % | — | — |
| 3811111000 | 6.00 % | — | — |
🇪🇺 European Union (TARIC)
| Code | MFN | Preferential | Unit |
|---|---|---|---|
| 3811111000 | 6.50 % | — | — |
| 3811119000 | 5.80 % | — | — |
| 3811110000 | — | — | — |
🇺🇸 United States (HTSUS)
| Code | MFN | Preferential | Unit |
|---|---|---|---|
| 381111 | — | — | — |
| 3811111000 | Free | — | ["kg"] |
| 3811115000 | Free | — | ["kg"] |
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.
How Has Trade Volume Developed?
Trade Volume 2023
How to Classify This HS Code?
What products does HS 381111 cover?
This subheading covers anti-knock preparations for fuels, specifically those containing lead compounds. According to the World Customs Organization's Harmonized System Nomenclature, these preparations are designed to increase the octane rating of gasoline by preventing engine knocking. Official definitions from sources like the USITC Harmonized Tariff Schedule (HTS) and the EU's TARIC database confirm that this category is strictly for lead-based anti-knock agents, such as tetraethyllead (TEL) and tetramethyllead (TML), which were historically used but are now largely phased out due to environmental concerns.
What falls outside HS 381111?
The following products are excluded from HS 381111: anti-knock preparations that do not contain lead compounds, such as those based on manganese or iron, which are classified under HS 381119. Also excluded are fuel additives that serve other purposes, like detergents, antioxidants, or corrosion inhibitors, even if they are blended into fuels. For example, a fuel system cleaner designed to remove deposits would not fall under this subheading; it would likely be classified under HS 381190 as "Other" preparations for use in oil or gas wells or similar products.
What are common classification mistakes for HS 381111?
A common error is classifying modern, lead-free anti-knock preparations under HS 381111. This subheading is exclusively for preparations containing lead compounds. Importers may mistakenly classify lead-free octane boosters, which often contain manganese or iron compounds, under this code. According to General Interpretative Rule 1 of the Harmonized System, classification is determined by the terms of the headings and any relative section or chapter notes. Misinterpreting the "lead compounds" requirement leads to incorrect classification.
How should importers classify products under HS 381111?
The correct procedure for classifying products under HS 381111 involves a thorough review of the product's chemical composition. Importers and customs brokers must confirm the presence of lead compounds, such as tetraethyllead or tetramethyllead, as the primary active ingredient. Consulting the product's Safety Data Sheet (SDS) and the official tariff schedule of the importing country, such as the USITC HTS or the UK Trade Tariff, is crucial. If lead compounds are present and the product is intended as an anti-knock agent for fuels, then HS 381111 is appropriate.
How is the duty calculated for products under HS 381111?
The duty calculation for products under HS 381111 is typically based on the declared customs value. For example, a shipment of 1,000 liters of a lead-based anti-knock preparation, declared at a customs value of $5,000 USD, would attract a US duty of $150.00. This is calculated using the Most Favored Nation (MFN) duty rate of 3.0% ad valorem, as published in the USITC Harmonized Tariff Schedule (HTS) for subheading 3811.11.0000 (3.0% x $5,000 USD = $150.00).
Which trade agreements reduce duties for HS 381111?
Several free trade agreements may reduce the applicable duty rate for HS 381111, including the United States-Mexico-Canada Agreement (USMCA). Under USMCA, qualifying goods originating from Canada or Mexico can receive a duty rate of Free. For example, a shipment of qualifying anti-knock preparations from Canada would be duty-free. Documentation required to claim this preference typically includes a USMCA certification of origin. Other agreements might offer reduced rates depending on the origin country and specific product qualifications.
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FAQ
What is the import duty rate for HS code 381111, "Anti-knock preparations"?
The Most Favored Nation (MFN) duty rate for HS code 381111 varies by importing country. For example, in the United States, the general rate is 3.5% ad valorem. In the European Union, under the TARIC system, the rate can be 0% or higher depending on the specific product and origin. Always consult the specific tariff schedule of the destination country for the most accurate and up-to-date duty rates. Preferential rates may apply under various trade agreements.
What are the classification criteria for HS code 381111?
HS code 381111 covers "Anti-knock preparations, for petrol (gasoline)". This classification is based on the product's function and composition. Anti-knock preparations are additives designed to increase the octane rating of petrol (gasoline) and prevent engine knocking. The key is that the preparation is specifically intended for use in gasoline to improve its combustion properties. Products not intended for gasoline, or those that are primarily fuel themselves, would be classified elsewhere.
How is the import duty for HS code 381111 calculated, and can you provide an example?
The duty calculation for HS code 381111 is typically based on an ad valorem rate, meaning a percentage of the declared value of the goods. For instance, if the MFN duty rate is 3.5% ad valorem and you import a shipment of anti-knock preparations valued at $10,000 USD, the import duty would be calculated as: $10,000 USD (Value) × 3.5% (Duty Rate) = $350 USD. Some countries may also apply specific duties based on quantity (e.g., per liter or kilogram), or a combination of ad valorem and specific duties.
What documentation is typically required for importing goods classified under HS code 381111?
Standard import documentation for HS code 381111 generally includes a commercial invoice, packing list, and bill of lading or air waybill. Depending on the importing country and the specific composition of the anti-knock preparation, additional documentation may be required. This could include a Certificate of Origin to claim preferential duty rates, safety data sheets (SDS) for chemical products, and potentially import permits or licenses if the product is subject to specific chemical regulations or environmental controls. It is crucial to verify these requirements with the customs authorities of the destination country.
Do common trade agreements, like USMCA or EU trade deals, affect the duty rates for HS code 381111?
Yes, common trade agreements can significantly affect duty rates for HS code 381111. For example, goods originating from countries that are signatories to the United States-Mexico-Canada Agreement (USMCA) may be eligible for preferential duty rates, potentially reducing or eliminating the MFN duty. Similarly, trade agreements between the European Union and other countries can lead to reduced tariffs. To benefit from these agreements, importers must typically provide a valid Certificate of Origin demonstrating that the goods meet the rules of origin stipulated in the respective trade agreement.