Deduction for input purchases fails when the related oil sale is exempt from tax and outside the taxable turnover.

A deduction or rebate for the purchase turnover of groundnuts used in manufacturing groundnut oil is available only where the corresponding oil sale forms part of taxable turnover. The rules are aimed at preventing double taxation on the same commodity, so if the oil is sold outside the State and that sale is exempt from tax under Article 286, the statutory condition for deduction under rule 18(2) is not met. The claimed deduction and rebate were therefore unavailable.

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Issues: Whether a registered manufacturer of groundnut oil, whose sale of oil outside the State was exempt from tax, could nevertheless claim deduction or rebate under rule 18(2) in respect of the purchase turnover of the groundnuts used in manufacturing the oil.

Analysis: Rule 5(1)(k) and rule 18(2) of the Turnover and Assessment Rules operate to determine the taxable net turnover and permit deduction of the value of groundnuts purchased and converted into oil only where the sale proceeds of the oil form part of the taxable turnover. The deduction is intended to prevent the same commodity from being taxed twice over. If the oil sale itself is not taxable because it is an outside-State sale exempt under Article 286 of the Constitution of India, the condition for claiming the deduction is not satisfied. The rebate under rule 18(2) is therefore unavailable.

Conclusion: The assessees were not entitled to the claimed deduction or rebate, and the revision petitions failed.

Ratio Decidendi: A deduction designed to prevent double taxation on the same commodity is available only when the related sale turnover is taxable and included in the assessment turnover.

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