Works contract tax rules fail when they do not confine assessment to constitutionally taxable turnover.

The 1984 amendments enlarging the definitions of dealer, goods, sale, turnover and works contract were upheld as consistent with the Forty-sixth Constitutional Amendment and the expanded meaning of sale under article 366(29-A)(b). Section 3-B of the Tamil Nadu General Sales Tax Act and the Fourth Schedule were also sustained because they could be read as taxing only the turnover representing transfer of property in goods involved in works contracts within constitutional limits. Rules 6-A and 6-B were struck down as unconstitutional and unenforceable because their flat deduction scheme and machinery did not adequately confine assessment to constitutionally taxable turnover.

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Issues: (i) Whether the amendments made by the Tamil Nadu General Sales Tax (Fourth Amendment) Act, 1984 enlarging the definitions of dealer, goods, sale, turnover and works contract were constitutionally valid; (ii) Whether section 3-B of the Tamil Nadu General Sales Tax Act, 1959 and the Fourth Schedule were valid; (iii) Whether rules 6-A and 6-B of the Tamil Nadu General Sales Tax Rules, 1959 were constitutional and enforceable.

Issue (i): Whether the amendments made by the Tamil Nadu General Sales Tax (Fourth Amendment) Act, 1984 enlarging the definitions of dealer, goods, sale, turnover and works contract were constitutionally valid.

Analysis: The amendments were consequential to the Forty-sixth Constitutional Amendment and brought the State enactment into conformity with the expanded concept of sale in article 366(29-A)(b). The enlargement of the statutory definitions was only to accommodate the levy on the transfer of property in goods involved in the execution of works contracts, as recognised by the Supreme Court.

Conclusion: The 1984 Amendment Act, in so far as it amended those definitions, is intra vires and valid.

Issue (ii): Whether section 3-B of the Tamil Nadu General Sales Tax Act, 1959 and the Fourth Schedule were valid.

Analysis: Section 3-B levied tax on the turnover relating to transfer of property in goods involved in works contracts and was capable of being construed consistently with the constitutional scheme by reading the expression turnover as referring to taxable turnover. The provision did not, by its text, enlarge the field of taxation beyond the constitutional limits, and the absence of a detailed machinery provision in the section itself did not compel invalidation. The Fourth Schedule merely classified works contracts for rate purposes.

Conclusion: Section 3-B and the Fourth Schedule are constitutionally valid.

Issue (iii): Whether rules 6-A and 6-B of the Tamil Nadu General Sales Tax Rules, 1959 were constitutional and enforceable.

Analysis: The rules, as originally framed, adopted an inflexible and flat percentage deduction for labour and other charges, without adequately accommodating the actual accounts in each case and without proper machinery to exclude turnover beyond the State taxing power, including inter-State, outside and import or export transactions and goods governed by the Central Sales Tax Act. They failed to ensure that tax was confined to the value of goods involved in the works contract as constitutionally permissible. Those infirmities rendered the rules inconsistent with the constitutional limitations and the governing principles laid down for works contract taxation.

Conclusion: Rules 6-A and 6-B are unconstitutional, illegal and unenforceable, and orders or proceedings founded on them cannot stand.

Final Conclusion: The writ petitions succeeded in part: the validating amendments were upheld, section 3-B was sustained, but the machinery rules for assessment under works contracts were struck down, with consequential relief against proceedings based on those rules.

Ratio Decidendi: A State may tax the transfer of property in goods involved in a works contract only within the constitutional limits imposed by article 366(29-A)(b), articles 286 and the Central Sales Tax Act, 1956, and any machinery rule that fails to confine the levy to constitutionally taxable turnover is invalid; statutory definitions enacted to align the State law with the Forty-sixth Amendment are valid.

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