Final assessment and unjust enrichment barred refund where duty incidence was not disproved.

Refund of duty paid under a final assessment cannot be claimed unless that assessment is first challenged and set aside; a later change in the classification basis or Board circular does not reopen the finality of the assessment, so the refund was rejected. Refund claims must also satisfy the doctrine of unjust enrichment; where the claimant fails to produce material showing that the duty burden was not passed on, refund is barred, and the claim was rejected on that ground as well.

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Issues: (i) whether refund of duty could be claimed without challenging the assessment order under which duty was paid; (ii) whether the refund claim was barred by unjust enrichment.

Issue (i): whether refund of duty could be claimed without challenging the assessment order under which duty was paid

Analysis: The clearance was made pursuant to an approved classification and there was no material to show that the assessment during the relevant period was provisional. When an assessment has attained finality, duty paid on such clearance cannot be refunded unless the assessment itself is challenged and set aside. A subsequent change in the Board's circular or the basis for classification does not by itself reopen the final assessment.

Conclusion: The refund claim was not maintainable on this ground and the finding was against the assessee.

Issue (ii): whether the refund claim was barred by unjust enrichment

Analysis: Refund claims must satisfy the doctrine of unjust enrichment. The appellant did not produce satisfactory material to show that the duty burden had not been passed on to customers. In the absence of supporting documents establishing non-passing of incidence, the refund could not be granted.

Conclusion: The refund claim failed on the ground of unjust enrichment and the finding was against the assessee.

Final Conclusion: The order denying refund was sustained, as the assessee failed both on maintainability against a final assessment and on the requirement to disprove passing on of duty incidence.

Ratio Decidendi: Refund of duty paid under a final assessment cannot be granted without first challenging that assessment, and every refund claim must independently satisfy the doctrine of unjust enrichment.

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