Finalised excise assessment cannot be reopened collaterally to resist differential duty demand after an unchallenged valuation.

A finalized assessment under Rule 173-I of the Central Excise Rules, 1944 that was never challenged through the statutory appellate route cannot be reopened in collateral proceedings arising from a show cause notice. Where the assessee declared the assessable value, paid duty on that basis, and allowed the assessment to attain finality, the same value cannot later be redetermined to reduce differential duty liability under Notification No. 19/95-CE. The article states that the demand was consequential to the closed assessment, the challenge to differential duty was not maintainable, and the proper course was to contest the assessment itself through appeal.

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Issues: Whether the assessee could, in proceedings arising from a show cause notice, seek re-determination of the assessable value after the assessment under Rule 173-I of the Central Excise Rules, 1944 had been finalized and not challenged, and thereby avoid the differential duty demand under Notification No. 19/95-CE dated 16.03.1995.

Analysis: The assessment made under Rule 173-I had attained finality and was never subjected to a statutory appeal. The demand proceedings were only consequential to that finalized assessment. Once the assessee had declared the value, paid duty on that basis, and allowed the assessment to become final, the same value could not later be reopened or re-determined in collateral proceedings to claim a lower duty liability. The aggregate value of clearances was therefore rightly computed on the declared assessable values, and the assessee could not invoke Section 4(1)(a) to reopen the closed assessment.

Conclusion: The challenge to the differential duty demand was not maintainable, and the demand was rightly sustained.

Final Conclusion: No question of law arose for interference, as the disputed duty liability flowed from a finalized and unchallenged assessment that could not be reopened in consequential proceedings.

Ratio Decidendi: A finalized and unchallenged assessment cannot be collaterally reopened in subsequent proceedings arising from a show cause notice; the proper course is to challenge the assessment itself through the statutory appellate remedy.

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