Input Tax Credit time limits require strict compliance with statutory filing conditions, not relaxation for business constraints.

The court construes Input Tax Credit as a concession contingent on strict compliance with statutory prerequisites, holding that time-bound procedural conditions operate as substantive preconditions to claiming ITC. The non-obstante clause is given a limited operative scope and does not nullify mandatory temporal conditions; established principles of tax-statute interpretation require literal application of the scheme and adherence to filing timelines despite commercial hardships.

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