Differential Modvat credit is permitted when input duty is paid later and the final product remains dutiable.

Where the final product remains dutiable and additional duty is later paid on inputs, the Modvat scheme permits consequential differential credit under Rule 57E. The later claim cannot be rejected merely because the inputs were cleared earlier or because the credit is taken in stages, as the adjustment reflects actual duty paid on inputs. Rule 57C applies only when the final product is wholly exempt or chargeable at nil rate, which was not the position here. The scheme also does not require rigid lot-wise correlation between a particular batch of inputs and the final product to defeat such credit.

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Issues: (i) Whether additional Modvat credit could be taken later when the duty on inputs was paid subsequently and the final product remained dutiable. (ii) Whether Rule 57C of the Central Excise Rules, 1944 or the requirement of strict correlation between a particular lot of inputs and the final product barred such credit.

Issue (i): Whether additional Modvat credit could be taken later when the duty on inputs was paid subsequently and the final product remained dutiable.

Analysis: The dispute arose from credit taken in stages, including credit based on certificates showing payment of additional duty by the input manufacturer. The higher credit was not confined to a mere notional benefit divorced from actual duty payment. Rule 57E recognised adjustment of credit where duty on inputs varied later, and therefore a later claim to the consequential credit could not be rejected merely because the input was originally cleared earlier. The final product was always liable to duty, so the factual basis for denying credit on the footing of exempt output was absent.

Conclusion: The later taking of differential Modvat credit was permissible and the objection to it failed.

Issue (ii): Whether Rule 57C of the Central Excise Rules, 1944 or the requirement of strict correlation between a particular lot of inputs and the final product barred such credit.

Analysis: Rule 57C applied only where the final product became wholly exempt or chargeable at nil rate. That situation was not present. The insistence on strict lot-wise correlation would also make Rule 57E ineffective, because that rule contemplated adjustment of credit when duty on inputs changed after clearance. The earlier Tribunal view denying credit in the context of exempt final products was distinguished, and no bar was found in the Modvat scheme against granting the differential credit in the present facts.

Conclusion: Rule 57C did not bar the credit and strict input-output correlation was not required to deny the respondent's claim.

Final Conclusion: The departmental challenge to the allowance of differential Modvat credit was rejected, and the assessee's entitlement to the credit was upheld.

Ratio Decidendi: Where the final product remains dutiable and additional duty is subsequently paid on inputs, the Modvat scheme permits consequential differential credit and does not require rigid lot-wise correlation to defeat that credit.

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