Refunds on estimated-cost clearances: unjust enrichment may fail, but Section 11B limitation and CAS-4 valuation still govern.

Refund claims arising from post-clearance finalisation of estimated cost were discussed on five points: unjust enrichment was held inapplicable where duty incidence was not shown to have been passed on, so that ground could not sustain rejection; however, because Rule 7 provisional assessment was not adopted, the claims remained governed by Section 11B and were subject to the one-year limitation from the relevant date, making time-barred claims unsustainable. Valuation had to follow CAS-4 under the excise valuation framework, not merely Chapter 13 of the Railway Code. Refund could not be denied only because invoices lacked batch numbers if correlation was otherwise proved from cost sheets and records.

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Issues: (i) whether the refund claims were barred by unjust enrichment; (ii) whether the refund claims were barred by limitation under Section 11B; (iii) the effect of non-adoption of provisional assessment under Rule 7; (iv) whether valuation was to be determined on CAS-4 basis or under Chapter 13 of the Indian Railway Code; and (v) whether refund could be denied for want of batch numbers or cost-sheet correlation in the invoices.

Issue (i): Whether the refund claims were barred by unjust enrichment.

Analysis: The refunds arose from excess duty paid on clearances made on estimated cost, with the excess becoming identifiable only after finalisation of actual batch cost. The goods were supplied to Indian Railways for operational use, and no material showed recovery of the duty incidence from any independent buyer or commercial gain to the assessee. The presumption under Section 12B stood rebutted on the facts.

Conclusion: The bar of unjust enrichment did not apply, and rejection of refund on that ground was unsustainable.

Issue (ii): Whether the refund claims were barred by limitation under Section 11B.

Analysis: As provisional assessment under Rule 7 had not been followed, the clearances could not be treated as provisional assessments in law. In that situation, refund of excess duty had to be pursued under Section 11B and remained subject to the statutory period of one year from the relevant date. The date of finalisation of actual cost could not be treated as the relevant date in the absence of provisional assessment.

Conclusion: Claims filed beyond the limitation period were barred, while claims within time were maintainable subject to verification.

Issue (iii): The effect of non-adoption of provisional assessment under Rule 7.

Analysis: Rule 7 provides the statutory mechanism where value or duty cannot be determined at clearance. The assessee did not invoke that procedure, so the assessments could not acquire the character of provisional assessments merely because differential duty was later accepted when cost increased. Non-adoption of Rule 7 did not extinguish the substantive right to seek refund, but it confined the remedy to Section 11B with its limitation and conditions.

Conclusion: The assessments were not provisional in law, and the refund remedy remained governed by Section 11B.

Issue (iv): Whether valuation was to be determined on CAS-4 basis or under Chapter 13 of the Indian Railway Code.

Analysis: For valuation under Rule 8, assessable value had to be determined on cost of production in accordance with the Central Excise valuation framework. Internal railway accounting or costing instructions could not override the statutory valuation regime. CAS-4 was the accepted costing standard for excise valuation, whereas Chapter 13 of the Railway Code could not control excise assessable value.

Conclusion: Valuation had to be determined on CAS-4 basis and not solely under Chapter 13 of the Indian Railway Code.

Issue (v): Whether refund could be denied for want of batch numbers or cost-sheet correlation in the invoices.

Analysis: Absence of batch numbers in invoices did not by itself justify outright rejection, because the assessee followed batch costing and the same methodology had been accepted for differential duty when cost increased. However, the assessee had to establish correlation through cost sheets, production records, dispatch details, and other contemporaneous documents, and the adjudicating authority was required to verify admissibility and quantification on that basis.

Conclusion: Refund could not be denied merely for absence of batch numbers if correlation was otherwise established from the records.

Final Conclusion: The order was modified by setting aside the rejection based on unjust enrichment, sustaining the limitation bar for time-barred claims, affirming the statutory requirement of valuation under the excise regime, and remitting the matter for limited verification of correlation, quantification, and admissibility, while sustaining the denial relating to spares.

Ratio Decidendi: In refund cases arising from post-clearance finalisation of estimated cost, unjust enrichment is rebutted when the duty incidence has not been passed on and the claim is supported by the assessee's records, but in the absence of provisional assessment the refund remains governed by Section 11B and its limitation.

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