Retrospective price variation can trigger excise interest on differential duty, and repayment of interest already paid may be denied.

Where an escalation or price-variation clause operates retrospectively, differential central excise duty is treated as arising from the finally determined enhanced price at the time of removal, and interest follows that duty liability. The analysis applies the binding Supreme Court principle that interest is payable on such differential duty under the excise framework. On that basis, refund of interest already paid was not justified.

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Issues: Whether interest was payable on differential central excise duty arising from retrospective price variation, and whether the refund of interest already paid was permissible.

Analysis: The liability to pay interest was examined in the context of differential duty that became payable after finalisation of the price under an escalation or price variation clause. The governing principle applied was that where the price variation operates retrospectively, the value for duty at the time of removal is treated as being finally determined with reference to the enhanced price, and interest follows the same liability. Reliance was placed on the binding Supreme Court position affirming that interest is payable on such differential duty under the relevant excise framework.

Conclusion: Interest was payable on the differential duty arising from price variation, and the refund of the interest already paid was not justified.

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