Chapter 16 is the category of 'Preparations of meat, of fish, of crustaceans, molluscs or other aquatic invertebrates' in the Harmonized Commodity Description and Coding System, covering processed animal food products (such as cooked, cured, smoked, canned, etc.), but excluding products that are only simply frozen, fresh, chilled or dried (these are classified in Chapters 2 and 3). The core of this chapter lies in 'depth of processing', i.e., through heat treatment, seasoning, sealed packaging, etc., so that the product has the characteristics of being ready for direct consumption or long-term preservation. Heading 1604 specifically covers 'Prepared or preserved fish; caviar and caviar substitutes prepared from fish eggs', including products of whole or cut fish that have been cooked, smoked, cured, canned or otherwise processed. Under this heading, subheadings are further divided by fish species, such as salmon, herring, sardines, tuna, mackerel, etc., emphasizing that fish species is the key to classification. Note: fish that are only simply salted or smoked but not deeply processed may be classified in Chapter 3. The first 2 digits '16' represent Chapter 16, i.e., the chapter of prepared animal food products, distinct from fresh, chilled or frozen fish in Chapter 3. The 3rd-4th digits '04' represent heading 1604, specifically referring to prepared or preserved fish and caviar substitutes, excluding crustaceans, molluscs, etc. (classified in 1605). The 5th-6th digits '15' are the subheading, subdivided under 1604 by fish species; 160415 specifically refers to 'preparations of mackerel', i.e., all food products made from mackerel as raw material that have been prepared or preserved, whether whole, in pieces, canned or seasoned. This commodity is a mackerel product, which has gone beyond the scope of fresh, chilled, frozen or simply dried or salted in Chapter 3, and has undergone processing such as cooking, canning or seasoning, meeting the definition of 'preparations' in Chapter 16. Under heading 1604, because the fish species is mackerel, it is classified under subheading 160415, rather than other fish species subheadings (such as 160411 salmon, 160412 herring, 160413 sardines, etc.). If it is mackerel that is only salted but not deeply processed, it may be classified under 0305.

Product name: The specific name of the declared commodity, such as 'canned mackerel in oil', 'smoked mackerel fillets', etc., which must reflect the processing method and form. Brand type: Fill in the brand name or 'no brand', used for customs intellectual property protection and statistics. Export preference status: State whether preferential treatment such as free trade agreements is enjoyed, such as 'none', 'RCEP enjoyed', etc. Method of manufacture or preservation: Describe the processing technology in detail, such as 'boiled, canned', 'smoked, vacuum-packed', etc. Ingredient content: List the main ingredients and proportions, such as mackerel content, oil, salt, additives, etc. Packaging specifications: Fill in the packaging form and net weight, such as 'canned, 200g/can', 'vacuum bag, 500g/bag'. Brand (Chinese and foreign names): If there is a brand, both Chinese and foreign names must be provided; if no brand, fill in 'none'. Product name: Canned mackerel in oil; Brand type: No brand; Export preference status: None; Method of manufacture or preservation: Mackerel beheaded and gutted, soaked in brine, canned, vegetable oil added, sealed, high-temperature sterilized; Ingredient content: Mackerel 70%, vegetable oil 20%, water 5%, salt 3%, others 2%; Packaging specifications: Canned, net weight 200g/can, 24 cans/carton; Brand: None. The description of the manufacturing method is too simple, such as 'canned' without stating whether it has been cooked, which may lead to misclassification in Chapter 3. The ingredient content does not list additives; if preservatives are contained, they must be declared truthfully, otherwise it may be suspected of concealment. Packaging specifications do not match the actual goods, such as declaring 'canned' when it is actually vacuum bagged, affecting classification.

The core basis for classification lies in the depth of processing and fish species. First, the product must have undergone processing permitted by Chapter 16 (such as cooking, smoking, curing, canning, etc.), going beyond the simple freezing, chilling, drying or salting of Chapter 3. Second, the fish species must be mackerel, including various species of the genus Scomber. Finally, the product form (whole, cut, canned, etc.) does not affect the subheading; as long as the fish species is correct, it is classified under 160415. If it is a mixture of fish species, it is classified according to the main ingredient or the fish species with the largest content. 030549 Other dried, salted or brined fish: 030549 is mackerel that is only salted or dried, without deep processing such as cooking or canning, while 160415 is prepared or preserved mackerel products. 160411 Preparations of salmon: 160411 specifically refers to salmon preparations; the fish species is different, and mackerel preparations are classified under 160415. 160412 Preparations of herring: 160412 is herring preparations, which look similar to mackerel but are a different fish species; accurate identification of the fish species is required for classification. 160413 Preparations of sardines: 160413 is sardine preparations; sardines and mackerel are in the same family but different genera, and must be distinguished based on the Latin scientific name. 160419 Other prepared or preserved fish: 160419 covers preparations of fish species not elsewhere specified; if mackerel preparations were not specifically listed, they would be classified here, but 160415 specifically lists mackerel, so 160415 takes priority. Confirm whether the product processing method goes beyond simple freezing, salting or drying. Confirm whether the fish species is mackerel, and provide the Latin scientific name if necessary. Confirm whether the product has undergone deep processing such as cooking, canning or seasoning. Confirm whether the packaging is sealed and suitable for direct consumption or long-term preservation. Confirm whether other fish species are mixed in; if mixed, classify according to the main ingredient.

How to determine whether a mackerel product is classified under 160415 or 0305? The key is the depth of processing. If it is only salted, dried or smoked but not cooked, and still retains the characteristics of raw fish, it is classified under 0305; if it has undergone deep processing such as cooking, canning or seasoning, making the product ready for direct consumption or long-term preservation, it is classified under 160415. Are both canned mackerel and mackerel in oil classified under 160415? Yes, as long as the fish species is mackerel and it has been prepared or preserved (such as canned or in oil), regardless of the specific form, it is classified under 160415. However, if other fish species are mixed in the can and are not the main ingredient, this does not affect classification. If a mackerel product contains a small amount of other fish, how is it classified? According to the General Rules for the Interpretation of the Harmonized System, if mackerel is the main ingredient (the greatest by weight) in a mixed fish product, it is classified under 160415; if another fish species is the main ingredient, it is classified under the corresponding fish species subheading. It is recommended to provide ingredient proportions at the time of declaration. How should 'Method of manufacture or preservation' be filled in among the declaration elements for 160415? It should describe the processing technology in detail, such as 'beheaded and gutted, soaked in brine, canned, vegetable oil added, sealed, high-temperature sterilized', etc., avoiding merely writing 'canned' or 'manufactured', so that customs can classify accurately. Are HS codes consistent when mackerel products are exported to different countries? The first 6 digits of the HS code are unified internationally, but countries may subdivide the later digits differently. For export, the customs tariff of the destination country shall prevail; it is recommended to check the latest tariff of the destination country or consult a local customs broker. Where can the tax rate for 160415 be queried? It can be queried through the official website of the General Administration of Customs of China, the International Trade Single Window, or the customs website of the destination country. Tax rates may change due to free trade agreements, most-favored-nation treatment, etc.; it is recommended to use the latest tax rate at the time of declaration. Is it necessary to provide the Latin scientific name when classifying mackerel products? If customs has doubts about the fish species, it may require the Latin scientific name to confirm whether it is mackerel. It is recommended to prepare relevant certificates in advance, such as certificates of origin or test reports, to speed up customs clearance. How should the HS code be declared for cross-border e-commerce sales of canned mackerel? Cross-border e-commerce retail exports are usually declared as personal items or express shipments, but bulk exports still need to be declared under general trade. It is recommended to use 160415 and fill in the declaration elements truthfully to avoid return or fines due to classification errors.