Taxing statute interpretation: discretion to waive interest cannot be extended beyond the provision that expressly grants it.

Unexplained delay in filing a writ petition may justify refusal of relief, but the court must assess the surrounding circumstances, including prior pursuit of revision; the petition was not rejected on delay. Dismissal of a revision does not cause merger of the underlying Income-tax Officer's order, because it is only a refusal to exercise revisional jurisdiction; the merger objection was rejected. On interpretation of section 18A, the proviso permitting reduction or waiver of interest applied only to the distinct class covered by section 18A(6) and could not be extended to the mandatory scheme in section 18A(8); rule 48 could not enlarge that discretion. The challenge to the levy of penal interest therefore failed.

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Issues: (i) Whether the writ petition should be rejected for inordinate delay and laches; (ii) whether the dismissal of revision by the Commissioner caused merger of the Income-tax Officer's order so as to bar challenge to the underlying orders; (iii) whether the proviso conferring power to reduce or waive interest under section 18A(6) applied to cases falling under section 18A(8), and whether rule 48 enlarged that discretion.

Issue (i): Whether the writ petition should be rejected for inordinate delay and laches.

Analysis: The filing of a writ petition is a matter of diligence, and unexplained delay may justify refusal of relief. At the same time, there is no rigid time-bar applicable to every case, and the court must consider the surrounding circumstances, including the pursuit of revision and the explanation offered for approaching the court after the earlier proceedings ended.

Conclusion: The petition was not rejected on the ground of delay.

Issue (ii): Whether the dismissal of revision by the Commissioner caused merger of the Income-tax Officer's order so as to bar challenge to the underlying orders.

Analysis: A distinction was drawn between appeal and revision. Dismissal of a revision does not amount to confirmation of the order under challenge; it is only a refusal to exercise revisional jurisdiction. The operative and enforceable order remained the order of the Income-tax Officer, and the revisional dismissal did not absorb it by merger.

Conclusion: The objection based on merger was rejected.

Issue (iii): Whether the proviso conferring power to reduce or waive interest under section 18A(6) applied to cases falling under section 18A(8), and whether rule 48 enlarged that discretion.

Analysis: The court applied the plain language of the provision and held that section 18A(6) governed a distinct class of assessees who had paid advance tax on the basis of their own estimate, whereas section 18A(8) was mandatory and covered cases where no such payment had been made in accordance with the section. The proviso empowering reduction or waiver of interest was confined to section 18A(6) and could not be imported into section 18A(8) by implication or on the theory of referential legislation. Rule 48 was read as implementing the discretion contained in the proviso to section 18A(6) and could not control or enlarge the mandatory language of section 18A(8).

Conclusion: The proviso did not apply to section 18A(8), and no discretion to waive or reduce interest was available under that provision.

Final Conclusion: The challenge to the levy of penal interest failed, and the court upheld the Revenue's position on the construction of section 18A.

Ratio Decidendi: A proviso conferring discretion to reduce or waive interest under one sub-section of a taxing provision cannot be extended to a separate mandatory sub-section unless the statute expressly so provides; in construing a taxing statute, the plain language prevails over considerations of presumed anomaly.

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