Specific tariff heading prevails over general engine parts classification; prior mistaken self-classification creates no estoppel in tax matters.

An air cleaner/oil bath assembly was treated as a distinct filtering or purifying apparatus and classified under Heading 84.21, because a specific tariff entry prevails over the general heading for parts used with engines and Section XVI Note 2(a) requires goods included in Chapter 84 or 85 to be classified in their own heading. Prior mistaken self-classification under Heading 84.09 did not bar correction, as there is no estoppel in taxation matters. The impugned classification was set aside and the product was held classifiable under Heading 84.21 with consequential relief.

---

---

Issues: (i) Whether air cleaner assembly/oil bath assembly was classifiable under Heading 84.21 as filtering or purifying machinery and apparatus for liquids or gases, or under Heading 84.09 as parts suitable for use solely or principally with engines. (ii) Whether the appellants were precluded from claiming the revised classification on the ground that they had earlier filed the product under Heading 84.09.

Issue (i): Whether air cleaner assembly/oil bath assembly was classifiable under Heading 84.21 as filtering or purifying machinery and apparatus for liquids or gases, or under Heading 84.09 as parts suitable for use solely or principally with engines.

Analysis: The product was an independent air cleaner/oil bath assembly and answered the description of purifying apparatus for liquids or gases under Heading 84.21. Note 2(a) of Section XVI required parts which are goods included in any heading of Chapter 84 or 85 to be classified in their respective headings. The HSN explanatory notes also supported classification under Heading 84.21. The fact that the product was used with IC engines did not displace a specific tariff entry, and the specific heading had to prevail over the general heading.

Conclusion: The classification under Heading 84.21 was correct and the classification under Heading 84.09 was not sustainable.

Issue (ii): Whether the appellants were precluded from claiming the revised classification on the ground that they had earlier filed the product under Heading 84.09.

Analysis: The earlier self-classification was made under a mistaken understanding and was later corrected through a fresh classification list. In taxation matters, there is no estoppel against a party, and an incorrect earlier classification did not bar the appellants from claiming the proper heading.

Conclusion: The plea of estoppel was rejected against the appellants.

Final Conclusion: The impugned classification order was set aside and the appeal was allowed, with the product held classifiable under Heading 84.21 and consequential relief granted as permissible in law.

Ratio Decidendi: Where a product is specifically covered by a tariff heading, it must be classified under that specific heading notwithstanding its use with another machine, and prior mistaken classification does not create estoppel in taxation matters.

---