Indirect tax refunds are barred by unjust enrichment when duty has been passed on, while unconstitutional levies may still be challenged.

Refund claims in indirect taxation are governed by an exhaustive statutory scheme for ordinary claims, but constitutional or wholly without-jurisdiction levies may still be challenged by suit or writ outside that framework. A payer who has passed on the incidence of excise duty cannot obtain refund merely by invoking mistake of law or Section 72 of the Contract Act, because restitution is barred by unjust enrichment. The amended refund provisions, including the rebuttable presumption of passing on and the Consumer Welfare Fund mechanism, were upheld as a valid response to unjust enrichment and were applied to pending matters that had not attained finality.

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Issues: (i) Whether claims for refund of excise duty could be maintained by suit or writ petition outside the statutory refund scheme where the levy was said to be illegal or unconstitutional. (ii) Whether a payer who had passed on the burden of excise duty could recover refund on the basis of mistake of law or Section 72 of the Contract Act, 1872. (iii) Whether the amended refund provisions and allied provisions introducing the presumption of passing on and the Consumer Welfare Fund were valid and applicable to pending matters.

Issue (i): Whether claims for refund of excise duty could be maintained by suit or writ petition outside the statutory refund scheme where the levy was said to be illegal or unconstitutional.

Analysis: The statutory scheme under the Central Excises and Salt Act, 1944 and the Rules made refund machinery exhaustive for ordinary claims arising from misconstruction, misapplication, or erroneous assessment under the Act. At the same time, the broader principles governing exclusion of civil court jurisdiction recognized that where a levy was unconstitutional, void, or wholly without jurisdiction, a civil suit or writ petition could still lie. The scope of the ouster depended on the nature of the challenge and the category of the claim, and not every claim for refund was confined to the statutory forum.

Conclusion: Refund claims based on unconstitutional or wholly without jurisdiction levies were maintainable outside the statutory scheme, but ordinary refund claims arising under the Act were to be pursued under the Act.

Issue (ii): Whether a payer who had passed on the burden of excise duty could recover refund on the basis of mistake of law or Section 72 of the Contract Act, 1872.

Analysis: The Court held that the principle of restitution under Section 72 is grounded in unjust enrichment and cannot be applied to confer a windfall on a claimant who has not suffered loss because the burden was passed on to others. The earlier view that mistake of law by itself always entitled the payer to recover was confined to its facts and did not address the situation where the incidence had been shifted. In indirect taxation, the economic burden ordinarily moves to consumers, and a claimant seeking refund must show that the burden was not passed on.

Conclusion: A payer who has passed on the incidence of duty is not entitled to refund on the basis of mistake of law or restitution.

Issue (iii): Whether the amended refund provisions and allied provisions introducing the presumption of passing on and the Consumer Welfare Fund were valid and applicable to pending matters.

Analysis: The amended provisions were treated as a valid legislative response to the problem of unjust enrichment in indirect taxation. The statutory presumption that the incidence of duty has been passed on was held rebuttable, and the provisions directing certain refunds to the Consumer Welfare Fund were upheld as part of the refund scheme. Pending refund claims were required to conform to the amended law where they had not attained finality, while matters finally concluded by court decree or final order stood on a different footing.

Conclusion: The amended refund regime was upheld, and it governed pending refund proceedings, subject to the limits indicated for finally concluded matters.

Final Conclusion: The law of refund in indirect taxation was restructured to prevent unjust enrichment, while preserving limited remedies for unconstitutional or wholly unauthorised levies and for claims that satisfied the statutory conditions. The appeals and connected matters were disposed of in accordance with that framework.

Ratio Decidendi: In indirect tax matters, refund is not an automatic consequence of illegality or mistake of law; it is denied where the claimant has passed on the burden, and statutory refund schemes may validly require proof that the incidence has not been shifted before repayment is ordered.

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