Retail sales tax on motor spirit was held to be a provincial sales tax, not an excise duty.

Tax imposed on the retail sale of motor spirit and lubricants was construed as a levy on a sale transaction, not as a duty of excise. The Federal and Provincial Legislative Lists were read harmoniously, and "taxes on the sale of goods" was held to cover the last retail sale to the consumer, while "duties of excise" was confined to goods manufactured or produced in India at, or in connection with, the manufacture stage. As the impugned levy applied to retail sales as articles of trade, without reference to manufacture or origin, it fell within provincial legislative competence and was not ultra vires.

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Issues: Whether the tax imposed on retail sales of motor spirit and lubricants falls within the provincial power to levy taxes on the sale of goods or within the federal power to impose duties of excise, and whether the impugned Act is ultra vires the Provincial Legislature.

Analysis: The competing entries in the Federal and Provincial Legislative Lists were construed together on a liberal and harmonious basis so as to avoid unnecessary overlap. The expression "taxes on the sale of goods" was given its ordinary meaning and held to cover a tax imposed on the last retail sale to the consumer. The expression "duties of excise" was read as relating to goods manufactured or produced in India, with the taxing power confined to the manufacture or production stage, or at least to a stage connected with such manufacture or production. The tax under the impugned Act was imposed on retail sales as existing articles of trade and commerce, without reference to manufacture or production and irrespective of origin, and therefore its true character was a provincial sales tax rather than an excise duty.

Conclusion: The Act was held to be within provincial legislative competence and not ultra vires.

Ratio Decidendi: Where a tax is imposed on the retail sale of goods as a sale transaction unconnected with manufacture or production, it is a tax on the sale of goods and not a duty of excise; the Provincial Legislature may validly enact such a levy notwithstanding the existence of federal excise power over manufactured or produced goods.

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