Retrospective tax amendment upheld: excise duty deduction denied and withdrawal of sales tax exemption sustained.

Retrospective amendment to the Madras sales tax law removed the earlier basis for deducting excise duty from taxable turnover under the Central Sales Tax framework, and the dealers failed to satisfy the statutory conditions for the concession. The deduction was therefore not available. The challenge to the Madras General Sales Tax (Second Amendment) Act, 1969 also failed: the power to tax sales included the power to withdraw an exemption, and retrospective operation was not invalid merely because it altered the earlier tax position. The amending Act was held to be within legislative competence and effective retrospectively, leaving the assessments and Tribunal orders intact.

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Issues: (i) Whether excise duty paid by the dealer was deductible from the taxable turnover under the Central Sales Tax Act in view of the retrospective amendment to the Madras sales tax law and the subsequent Central amendment. (ii) Whether the Madras General Sales Tax (Second Amendment) Act, 1969 was beyond legislative competence or invalid for giving retrospective effect and withdrawing the earlier exemption.

Issue (i): Whether excise duty paid by the dealer was deductible from the taxable turnover under the Central Sales Tax Act in view of the retrospective amendment to the Madras sales tax law and the subsequent Central amendment.

Analysis: The earlier State rule allowing deduction of excise duty had been withdrawn retrospectively by the Madras amending legislation for the relevant period, and the Central Sales Tax (Amendment) Act, 1969 was intended to operate with reference to the law as finally in force at the date of assessment. The statutory concession under the Central amendment was available only if the dealer satisfied the prescribed conditions, including that the tax had not been collected and that it could not have been levied or collected under the amended law. On the facts found, the dealers did not satisfy the second condition, because the retrospective State amendment removed the basis on which excise duty could be treated as excluded from turnover under the Central law.

Conclusion: The deduction was not allowable and the assessee was not entitled to the claimed relief.

Issue (ii): Whether the Madras General Sales Tax (Second Amendment) Act, 1969 was beyond legislative competence or invalid for giving retrospective effect and withdrawing the earlier exemption.

Analysis: The subject of sales tax and incidental withdrawal of exemptions lay within the State legislative field, and a competent legislature could withdraw a concession previously granted. Retrospective operation by itself did not render the law unreasonable or unconstitutional, particularly where the legislative intention was clear and the measure was enacted to align the position with the prevailing legal framework and protect public revenue. The challenge based on lack of competence, excess over parliamentary power, and invalidity of retrospective legislation therefore failed.

Conclusion: The Madras amending Act was within competence and validly retrospective.

Final Conclusion: The impugned assessments and the Tribunal's orders were sustained, and the writ petitions failed on all material grounds.

Ratio Decidendi: Where a competent legislature clearly enacts a retrospective amendment withdrawing a tax exemption, the amended law governs the assessment period and the assessee cannot claim a deduction or exemption inconsistent with the law as retrospectively altered.

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