Octroi base cannot extend beyond entry value; refund of excess collection remains subject to unjust enrichment review.

The amended explanation to Rule 2(20) of the Surat City Municipal Corporation Octroi Rules, 1973 was invalid because delegated legislation could not expand octroi beyond entry of goods into the local area for consumption, use or sale. By shifting the taxable base from entry value to post-entry sales value, the rule went beyond Entry 52 of List II and the parent Act, so it was struck down as ultra vires. Refund of excess octroi was not automatic, however, because the doctrine of unjust enrichment required proof that the burden had not been passed on to consumers. Refund was therefore made conditional on that verification, with simple interest at 12% per annum on the refundable amount.

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Issues: (i) Whether the amended explanation to Rule 2(20) of the Surat City Municipal Corporation Octroi Rules, 1973, which required octroi on yarn to be assessed at 100% of sales value, was ultra vires the Constitution and the parent Act. (ii) Whether the petitioners were entitled to refund of excess octroi collected, subject to examination of unjust enrichment.

Issue (i): Whether the amended explanation to Rule 2(20) of the Surat City Municipal Corporation Octroi Rules, 1973, which required octroi on yarn to be assessed at 100% of sales value, was ultra vires the Constitution and the parent Act.

Analysis: Entry 52 of List II permits taxation only on entry of goods into a local area for consumption, use or sale therein. Section 2(42) of the Bombay Provincial Municipal Corporations Act defines octroi as a cess on entry of goods into the limits of a city for consumption, use or sale therein, and the rule-making power under Sections 127, 149 and 457 of that Act could not travel beyond that legislative field. The amended explanation shifted the taxable base from the value at entry to the post-entry sales value, thereby including expenses incurred after the goods had entered the city limits. That transgressed the scope of octroi, conflicted with the parent Act, and exceeded delegated legislative power. The plea that the amendment was justified to curb evasion did not cure the lack of authority.

Conclusion: The amendment was held unconstitutional and struck down as ultra vires.

Issue (ii): Whether the petitioners were entitled to refund of excess octroi collected, subject to examination of unjust enrichment.

Analysis: Although the impugned levy was struck down, refund of a tax or cess cannot follow automatically. The principle of unjust enrichment requires the assessee to establish that the burden was not passed on to consumers or third parties. The earlier interim arrangement and the Supreme Court's direction did not dispense with this requirement. The authority therefore had to examine whether the incidence of excess octroi had been passed on before granting refund.

Conclusion: Refund was directed only after verification of unjust enrichment, with simple interest at 12% per annum on the amount found refundable.

Final Conclusion: The challenge to the amended octroi rule succeeded, but monetary relief was made conditional on proof that the burden had not been passed on. The petitions were thus allowed to that limited extent.

Ratio Decidendi: Delegated legislation imposing octroi cannot enlarge the taxable base beyond the entry of goods into the local area for consumption, use or sale, and any refund of illegally collected tax remains subject to the doctrine of unjust enrichment.

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