Excise valuation must follow factory-gate wholesale price, excluding post-manufacturing costs and downstream resale margins.

Excise duty under Section 4(a) had to be assessed on the manufacturer's factory-gate wholesale cash price, confined to manufacturing cost and manufacturing profit, and not on the customer-companies' resale prices. Post-manufacturing elements such as selling expenses, selling profit, freight and octroi were excluded from the assessable value, and the customer-companies were not shown to be related or favoured buyers so as to displace the ordinary wholesale price basis. Assessments made on the wrong valuation basis were vitiated by error of law and could not stand merely because earlier returns or assessments had been filed; the impugned assessments were quashed to that extent and reassessment with consequential refund was directed.

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Issues: (i) Whether excise duty under Section 4(a) of the Central Excises and Salt Act, 1944 was to be assessed on the manufacturer's sale price to its customer-companies or on the customer-companies' resale prices; (ii) Whether the past assessments made between 1961 and the date of the writ application were void and liable to be quashed and refunded.

Issue (i): Whether excise duty under Section 4(a) of the Central Excises and Salt Act, 1944 was to be assessed on the manufacturer's sale price to its customer-companies or on the customer-companies' resale prices.

Analysis: The governing principle is that excise is a duty on manufacture and the assessable value must represent the wholesale cash price at the factory gate, limited to manufacturing cost and manufacturing profit. Post-manufacturing selling expenses, selling profit, freight, octroi, and other downstream elements are not to be loaded into the assessable value. Where sales are made in bona fide wholesale transactions at arm's length, the manufacturer's price to its wholesale buyers is the relevant price, and the buyers' subsequent resale price is irrelevant. On the facts, the customer-companies were not shown to be favoured buyers or related persons in a manner that displaced the ordinary wholesale price basis.

Conclusion: The assessable value had to be based on the appellant's sale price comprising manufacturing cost and manufacturing profit only, and not on the customer-companies' resale prices.

Issue (ii): Whether the past assessments made between 1961 and the date of the writ application were void and liable to be quashed and refunded.

Analysis: An assessment made by applying a legally impermissible basis of valuation is vitiated by error of law and cannot be sustained merely because the assessee had filed price lists or because the error was reflected in earlier assessments. There can be no estoppel against statute, and a mistaken assessment does not become immune from judicial correction merely by lapse of time where the illegality is patent and the wrong basis of valuation governed the computation. The court therefore treated the impugned assessments as nullities to the extent they included post-manufacturing elements and directed reassessment on the correct basis with consequential refund of excess duty.

Conclusion: The past assessments were quashed to the extent of the illegal valuation basis, and consequential refund was directed.

Final Conclusion: The appeal succeeded, the cross-objection failed, and the excise assessments had to be redone on the footing that only manufacturing cost and manufacturing profit formed the assessable value.

Ratio Decidendi: Under Section 4(a) of the Central Excises and Salt Act, 1944, excise valuation must be confined to the factory-gate wholesale cash price in an arm's length transaction, excluding post-manufacturing costs and profits.

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