Extended limitation in excise classification disputes fails where tariff ambiguity is genuine and suppression is not proved.

The extended period of limitation under the proviso to Section 11A(1) of the Central Excise Act could not be invoked where the classification of ethylene, propylene and butadiene turned on a genuinely uncertain tariff change and the Department had earlier accepted the assessee's classification under Chapter 27. After the Finance Act, 1986 amended the relevant Chapter Note in Chapter 29, the classification issue required reference to the tariff scheme, Chapter Notes and HSN guidance, and the uncertainty did not by itself show suppression or wilful misstatement. Because the Department failed to establish intent to evade duty, the longer limitation period was unavailable and the demand for the relevant period was time-barred.

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Issues: Whether the extended period of limitation under the proviso to Section 11A(1) of the Central Excise Act, 1944 could be invoked on the facts of the case.

Analysis: The classification of ethylene, propylene and butadiene had originally been accepted by the Department under Chapter 27, and the legal position altered only after the Finance Act, 1986 amended the relevant Chapter Note in Chapter 29 of the Central Excise Tariff Act, 1985. The amended tariff position required interaction with Chapter Notes and HSN guidance to determine whether the goods continued under Chapter 27 or moved to Chapter 29 on the basis of purity. In that setting, the Court found that the classification question was genuinely difficult, the tariff scheme itself had recently undergone major changes, and the assessee's conduct did not disclose a clear intent to evade duty. The Department, having approved the earlier classification list, did not establish suppression or wilful misstatement sufficient to justify the longer period.

Conclusion: The extended period of limitation was not available and the demand for the relevant period was time-barred.

Ratio Decidendi: Where a classification dispute arises from a recent and genuinely uncertain tariff amendment and the assessee's classification had earlier been accepted by the Department, the extended limitation period cannot be invoked unless suppression or intent to evade duty is affirmatively established.

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