Modvat credit time limit is substantive: credit taken after the six-month period under Rule 57G(5) was inadmissible.

Modvat credit under Rule 57G(5) had to be taken within six months from the date of issue of the duty paying documents. The six-month limit was treated as a substantive condition of entitlement, not a mere procedural requirement, so credit availed after that period was inadmissible. The rule was held to attach the time limit directly to the right to claim credit, and a late claim could not be treated as a curable defect in particulars.

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Issues: Whether Modvat credit could be denied when availed after expiry of six months from the date of issue of the duty paying documents, and whether the six-month condition under Rule 57G(5) was merely procedural.

Analysis: The relevant rule barred availment of credit after six months from the date of issue of the documents. The six-month period was treated as a legal time limit attached to the substantive benefit of credit, not as a mere procedural formality. The omission was therefore not comparable to a curable defect in particulars; it went to the entitlement to take credit itself.

Conclusion: The six-month condition under Rule 57G(5) is mandatory and substantive. Credit taken beyond that period was not admissible, and the appeal failed.

Ratio Decidendi: Where a fiscal rule fixes a specific time limit for availing credit, compliance with that time limit is a substantive condition of entitlement and not a mere procedural requirement.

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