PLA balance refund follows the special rules, so Section 11B interest on delayed duty refunds does not apply.

Refund of unspent PLA balance is governed by the specific refund mechanism under Rule 9(1A) read with Rule 173G(1A) of the Central Excise Rules, 1944, not by the general refund provision in Section 11B of the Central Excise Act, 1944. Because the claim is not a refund of duty under Section 11B, the interest provision in Section 11BB for delayed duty refunds does not apply. The reference to unjust enrichment in Section 11B does not convert the PLA balance into excise duty.

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Issues: Whether refund of unspent PLA balance is governed by Section 11B of the Central Excise Act, 1944 or by Rule 9(1A) read with Rule 173G(1A) of the Central Excise Rules, 1944, and whether interest under Section 11BB of the Central Excise Act, 1944 is payable on such refund.

Analysis: The refund claim concerned unspent PLA balance, and the applicable rules specifically provided for withdrawal and refund of amounts from the PLA through the prescribed excise authorities. The statutory scheme treated such refund as falling under the special rule-based mechanism rather than as a refund of duty under Section 11B. Since Section 11BB applies to delayed refund of duty, its operation was held inapplicable where the refund was not one under Section 11B. The order also recorded that the reference to unjust enrichment in Section 11B did not convert the PLA balance into duty.

Conclusion: The refund of unspent PLA balance is not governed by Section 11B of the Central Excise Act, 1944, and interest under Section 11BB is not payable on such refund; the appellant's challenge therefore fails.

Ratio Decidendi: Where a statute or rules provide a specific mechanism for refund of PLA balance, that refund is governed by the special provision and not by the general refund provision for duty, and consequential interest for delayed refund of duty is not attracted.

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