HS 840590 Parts
Quick Answer: Parts for gas generators imported under HS 840590 enter the UK at 0.00%, the EU at 1.70%, and the US at a range from Free to 45%. This classification specifically covers components and spare parts for the gas generators described in HS code 8405, which are used to produce combustible gas from solid materials. Importers should verify the specific duty rate applicable to their intended destination market, as the US rate can vary significantly. According to CustomTariffs data, understanding these varying rates is crucial for accurate landed cost calculations and compliance.
What Are the Import Duty Rates?
🇬🇧 United Kingdom
| Code | MFN | Preferential | Unit |
|---|---|---|---|
| 8405900000 | 0.00 % | — | — |
🇪🇺 European Union (TARIC)
| Code | MFN | Preferential | Unit |
|---|---|---|---|
| 8405900000 | 1.70 % | — | — |
🇺🇸 United States (HTSUS)
| Code | MFN | Preferential | Unit |
|---|---|---|---|
| 8405900000 | 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 840590 cover?
This subheading covers parts and accessories specifically designed for use with gas generators of heading 8405, which are machines and apparatus for the production of gas, such as producer gas or water gas. According to the World Customs Organization (WCO) Harmonized System Explanatory Notes, this includes components like grates, ash removal mechanisms, and ignition systems that are integral to the functioning of these gas generators. The US International Trade Commission (USITC) Harmonized Tariff Schedule (HTS) and the EU's TARIC database confirm that only parts exclusively intended for these specific gas-producing machines fall under this classification.
What falls outside HS 840590?
The following products are excluded from HS 840590: general-purpose machine parts that could be used in various machinery, and parts for other types of generators or engines not covered by heading 8405. For instance, common fasteners like bolts and nuts, or electrical components such as standard wiring harnesses, would typically be classified elsewhere based on their general nature or the specific machinery they are ultimately destined for, unless they are uniquely designed and identifiable as solely for a gas generator of heading 8405. Spare parts for unrelated equipment, such as internal combustion engines (heading 8407/8408), are not included.
What are common classification mistakes for HS 840590?
A common error is classifying general-purpose components as parts of gas generators under 840590 when they are not specifically designed for that purpose. According to General Rule of Interpretation (GRI) 1, classification is determined by the terms of the headings and any relative section or chapter notes. Importers may mistakenly classify a part that has multiple potential uses, failing to recognize that it must be exclusively for a gas generator of heading 8405. Another mistake is classifying complete machines or subassemblies that constitute a functional unit of a gas generator, which would be classified under heading 8405 itself.
How should importers classify products under HS 840590?
The correct procedure for classifying parts under HS 840590 involves a detailed examination of the part's design and intended use. Importers and customs brokers must verify that the part is specifically manufactured for and exclusively used with gas generators of heading 8405. This often requires consulting technical specifications, manufacturer's declarations, and the official Explanatory Notes of the Harmonized System. If a part has multiple applications, it should generally be classified under a more general heading unless its sole intended use for a gas generator is clearly established.
How is the duty calculated for products under HS 840590?
A specific grate component for a producer gas generator weighing 50 kg and declared at a customs value of $1,000 USD would attract a US duty of $35.00. This is calculated using the Most Favored Nation (MFN) duty rate of 3.5% ad valorem, applied to the declared customs value. Therefore, the calculation is 3.5% of $1,000 USD, resulting in $35.00. This rate is published in the USITC Harmonized Tariff Schedule (HTSUS) under subheading 8405900000.
Which trade agreements reduce duties for HS 840590?
Several free trade agreements may reduce the applicable duty rate for HS 840590, including the United States-Mexico-Canada Agreement (USMCA). Under USMCA, eligible parts originating from Canada or Mexico may enter the United States duty-free. For example, a qualifying part from Mexico would have a preferential rate of Free. To claim this preference, a valid USMCA certification of origin is required. Other agreements, like those with developing countries under the Generalized System of Preferences (GSP), may offer reduced rates, often requiring a GSP Form A.
```Which HS Codes Are Related?
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FAQ
What is the general import duty rate for HS code 840590, specifically for 'parts' of machinery for producing gases?
The Most Favored Nation (MFN) duty rate for HS code 840590, which covers 'parts' of machinery for producing or purifying gases, is 1.70% ad valorem in the United States. This means the duty is calculated as a percentage of the declared customs value of the imported parts. For example, if parts valued at $10,000 are imported, the duty would be $10,000 \times 0.0170 = $170.00. Always verify current rates with the USITC Harmonized Tariff Schedule.
Are there any preferential duty rates available for HS code 840590 under trade agreements?
While HS code 840590 itself does not typically have specific preferential rates tied to it across all agreements, the eligibility for preferential treatment depends on the origin of the parts and the specific trade agreement between the importing country and the exporting country. For instance, if the parts originate in a country with a Free Trade Agreement (FTA) with the United States, and they meet the rules of origin stipulated in that agreement, they might qualify for a 0.00% duty rate. Importers and brokers must consult the relevant trade agreement text and provide proof of origin, such as a Certificate of Origin, to claim preferential treatment.
What specific criteria determine if a component is classified as 'parts' under HS code 840590?
To be classified as 'parts' under HS code 840590, an item must be specifically designed or adapted for use in machinery of heading 8405 (gas-generating machines and apparatus). This generally means the component is not a general-purpose item that could be used in various types of machinery. It should be dedicated to the function of gas production or purification machinery. For example, a specialized impeller or a unique filtration element designed exclusively for a gas generator would likely fall under this code. General items like standard bolts, nuts, or generic electrical wiring would typically be classified elsewhere based on their own material or function.
What documentation is typically required when importing parts under HS code 840590?
When importing parts classified under HS code 840590, standard import documentation is required, including a commercial invoice, packing list, and bill of lading or air waybill. Crucially, to support the classification and value, a detailed description of the parts, their intended use within the gas-generating machinery, and potentially technical drawings or specifications may be requested by customs authorities. If claiming preferential duty rates under a trade agreement, a valid Certificate of Origin is mandatory. Importers should also be prepared to provide any safety or compliance certificates relevant to the specific type of parts being imported.
How is the duty calculated if the parts for gas machinery are imported with a specific quantity and a per-unit value, rather than a total value?
If parts under HS code 840590 are imported with a per-unit value, the duty calculation follows the ad valorem principle but requires determining the total value first. For example, if 500 specialized filters are imported, each valued at $20, and the MFN duty rate is 1.70%, the total value is 500 units \times $20/unit = $10,000. The duty is then calculated on this total value: $10,000 \times 0.0170 = $170.00. It is essential to accurately declare the quantity and the value per unit to ensure correct duty assessment. Some tariffs might also include specific duties or a combination, but for 840590 in the US, it's primarily ad valorem.