Purchase tax on incidental materials used in a works contract was held inapplicable, and consequential interest also failed.

Materials incidentally consumed by a dealer in executing an indivisible works contract, where the customer supplies the principal material and no transfer of property in those incidental inputs is established, do not attract purchase tax under section 13AA of the Bombay Sales Tax Act, 1959. Because the purchase tax itself was not leviable, the consequential interest under section 36(3)(b) also could not survive.

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Issues: (i) Whether materials such as silicon and copper used by the dealer in job work of converting customer-supplied aluminium into aluminium alloys were liable to purchase tax under section 13AA of the Bombay Sales Tax Act, 1959. (ii) Whether the consequential levy of interest under section 36(3)(b) of the Bombay Sales Tax Act, 1959 could be sustained.

Issue (i): Whether materials such as silicon and copper used by the dealer in job work of converting customer-supplied aluminium into aluminium alloys were liable to purchase tax under section 13AA of the Bombay Sales Tax Act, 1959.

Analysis: Section 13AA applies where a dealer liable under the Bombay Sales Tax Act purchases Schedule C goods and uses them in the manufacture of taxable goods that are not sold. The relevant activity, however, was execution of a works contract in which the customer supplied the principal material and the dealer used only a small quantity of its own materials. The Court held that the definitions of dealer, purchase price, sale and sale price under the Bombay Sales Tax Act operate in a different field from the works contract regime and cannot be overlapped by interpretation. The materials used were consumed in the process and lost their identity; no transfer of property in those materials to the customer was established. The levy under section 13AA therefore did not arise.

Conclusion: The levy of purchase tax under section 13AA was not sustainable and the finding was in favour of the assessee.

Issue (ii): Whether the consequential levy of interest under section 36(3)(b) of the Bombay Sales Tax Act, 1959 could be sustained.

Analysis: The interest levy was purely consequential to the purchase tax demand. Once the underlying purchase tax was held not leviable on the transaction, the foundation for charging interest under section 36(3)(b) disappeared.

Conclusion: The consequential interest was not payable and the finding was in favour of the assessee.

Final Conclusion: The reference was answered against the Revenue. The Court held that use of the dealer's incidental materials in executing the works contract did not attract purchase tax under the Bombay Sales Tax Act, 1959, and the connected interest levy also failed.

Ratio Decidendi: Materials consumed incidentally in the execution of an indivisible works contract, without transfer of property in those materials to the customer, do not attract purchase tax under section 13AA of the Bombay Sales Tax Act, 1959, and consequential interest cannot survive when the substantive levy fails.

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