Retrospective reclassification cannot withdraw accrued tax benefits; exemption and MODVAT credit depend on the relevant period's approved classification.

An approved classification of ammonia nitrate under Heading 2806.90 could not be revised retrospectively to withdraw fiscal benefits already attached to the earlier approval. For the relevant period, exemption under Notification No. 40/85 applied to oxygen and ammonia used in the manufacture of fertilizer, and MODVAT credit on the inputs could not be denied merely because of the attempted retrospective reclassification. The operative principle is that accrued tax benefits must be assessed by reference to the classification and use applicable during the relevant period, not by a later retroactive change.

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Issues: (i) Whether the approved classification of ammonia nitrate could be revised retrospectively so as to deny the assessee the benefit attached to the earlier approved classification. (ii) Whether oxygen and ammonia used in the manufacture of ammonia nitrate lumps were entitled to exemption and whether MODVAT credit on the inputs was available for the relevant period.

Issue (i): Whether the approved classification of ammonia nitrate could be revised retrospectively so as to deny the assessee the benefit attached to the earlier approved classification.

Analysis: The classification list for the relevant period had already been approved treating the product under Heading 2806.90, and the later attempt to alter that position retrospectively was not sustainable. A retrospective change in classification could not be used to reopen the assessee's position for the past period after approval had been granted.

Conclusion: Retrospective revision of the approved classification was not permissible and the issue was decided in favour of the assessee.

Issue (ii): Whether oxygen and ammonia used in the manufacture of ammonia nitrate lumps were entitled to exemption and whether MODVAT credit on the inputs was available for the relevant period.

Analysis: Notification No. 40/85 granted exemption to oxygen and ammonia when used in the manufacture of fertilizer. The product was used in the assessee's manufacturing stream for fertilizer-related output, and the inputs fell within the scope of the exemption. Since the relevant final product and inputs were covered by the MODVAT scheme for the period in question, credit could not be denied merely on the basis of the attempted retrospective reclassification.

Conclusion: The assessee was entitled to the exemption and to MODVAT credit for the relevant period.

Final Conclusion: The appeal failed because the assessee's approved classification could not be disturbed retrospectively and the benefit of the exemption and credit scheme remained available on the facts of the case.

Ratio Decidendi: An approved classification cannot be altered retrospectively to withdraw accrued fiscal benefits, and exemption or MODVAT eligibility must be determined on the basis of the classification and use applicable to the relevant period.

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