Madras High Court Sets Aside Appellate Orders in Air/Oil Filter Classification Case — HSN Triple Test Must Be Addressed

Background and Context

The Madras High Court recently intervened in a customs classification dispute involving air and oil filters, setting aside appellate orders that had been passed against Inzi Controls India Limited and directing fresh consideration of the matter. The case, decided on 08/09/2026, arose from WP Nos. 31862, 31868, 31874, 31974, 31976 and 31987 of 2026, and turned not on the merits of classification but on a fundamental procedural shortcoming in the appellate authority's decision-making process.

The core question before the Court was whether the appellate authority had meaningfully engaged with the petitioner's central legal argument — specifically, that the HSN Explanatory Notes prescribe a cumulative triple test that must be fully satisfied before any goods can be classified as parts under Section XVII of the Customs Tariff Act, 1975.

Who Is the Petitioner and What Was the Dispute?

Inzi Controls India Limited is a manufacturer engaged in supplying air filters and oil filters to automobile companies. For customs classification purposes, the petitioner placed these goods under Chapter 84 of the Customs Tariff Act, 1975 — more specifically under tariff headings 8421 23 00 and 8421 31 00, which cover filtering or purifying machinery and apparatus for liquids and gases.

The Revenue Department, however, initiated proceedings contending that the said goods ought to be classified under Chapter 87, which relates to vehicles and their parts and accessories. The dispute passed through adjudication, with orders in original dated 08.04.2024 being carried in appeal by the petitioner. Those appeals were dismissed by the appellate authority through impugned orders dated 11.05.2026, leading to the filing of these writ petitions.

The petitioner's counsel drew the Court's attention to the reply filed before the adjudicating authority dated 26.03.2024 in response to the show cause notice. In that reply, the petitioner had elaborated upon the HSN Explanatory Notes applicable to Chapter 87 / Section XVII, which lay down three cumulative conditions that must all be satisfied for any goods to qualify as "parts" classifiable under the chapters of Section XVII. These conditions, as reproduced in the petitioner's submissions, are:

(a) They must not be excluded by the terms of Note 2 of this section;
(b) They must be suitable for use solely or principally with the articles of chapter 86 to 88; and
(c) They must not be more specifically included elsewhere in the Nomenclature.

The petitioner argued that its products failed on two of the three conditions:

  1. **Condition (a)😗* Note 2(e) of Section XVII expressly excludes "machines and apparatus of headings 8401 to 8479 or parts thereof" from the scope of the expressions "parts" and "parts and accessories." Since heading 8421 falls squarely within the range of headings 8401 to 8479, the petitioner's goods are excluded from Chapter 87 coverage by operation of this Note itself.

  2. **Condition (c)😗* The goods are specifically and expressly covered under heading 8421, which includes oil filters for internal combustion engines and intake air filters for internal combustion engines as explicitly identified items in the HSN Explanatory Notes to that heading.

The petitioner therefore maintained that since two of the three cumulative conditions prescribed under the HSN Explanatory Notes are not met, classification under heading 8708 (Chapter 87) is legally unsustainable.

Relevant HSN Explanatory Note Extracts

The petitioner's reply extensively quoted from the HSN Explanatory Notes to heading 8421, which specifically identify the following as goods covered thereunder: