Additional sales tax liability follows full-year turnover, and parent Act rectification provisions remain available for supplementary levy matters.

Additional sales tax for assessment year 1996-97 was treated as payable on the basis of the full-year turnover, because the amended levy and revised exemption threshold were applied to the annual assessment period rather than isolated post-amendment turnover. The Tamil Nadu Additional Sales Tax Act, 1970 was read as supplemental to the general sales tax law, so the parent Act's rectification machinery and connected rules remained available where the statute and rules extended them mutatis mutandis. On that construction, Section 55-based rectification was available for additional sales tax matters, and the revision was decided against the assessee.

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Issues: (i) Whether additional sales tax was leviable for the assessment year 1996-97 under the amended scheme of the Tamil Nadu Additional Sales Tax Act, 1970. (ii) Whether Section 55 of the Tamil Nadu General Sales Tax Act, 1959 and the relevant rules could be invoked for rectification in relation to additional sales tax.

Issue (i): Whether additional sales tax was leviable for the assessment year 1996-97 under the amended scheme of the Tamil Nadu Additional Sales Tax Act, 1970.

Analysis: The liability to pay additional sales tax had to be understood in the context of the original provision and the amendment introducing Section 2(1)(aa). The reasoning accepted that the levy could not be defeated by isolating the period after 1 August 1996, because the annual turnover for the assessment year 1996-97 exceeded the statutory threshold. The amended exemption limit and the annual turnover for the whole year were ative of liability.

Conclusion: The assessee was liable to additional sales tax for the assessment year 1996-97.

Issue (ii): Whether Section 55 of the Tamil Nadu General Sales Tax Act, 1959 and the relevant rules could be invoked for rectification in relation to additional sales tax.

Analysis: The Tamil Nadu Additional Sales Tax Act, 1970 was treated as a supplement to the general sales tax enactment and not as a self-contained code. Section 2(1)(b) made the provisions of the general sales tax law applicable to additional tax, Section 4 empowered rule-making, and Rule 9 made the general sales tax rules applicable mutatis mutandis. On that basis, rectification under Section 55 was held to be available.

Conclusion: Section 55 and the connected rules were applicable for rectification in relation to additional sales tax.

Final Conclusion: The revision was answered against the assessee and the tax case revision was disposed of on the basis of the prior binding decision.

Ratio Decidendi: A supplemental sales tax enactment must be construed with the parent sales tax law, and where the statute and rules extend the parent Act mutatis mutandis, rectification provisions under the parent Act remain available for additional tax matters; annual turnover for the full assessment year governs liability under the amended levy.

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