Rectification under section 154 is limited to patent errors; debatable depreciation and asset-sale treatment cannot be corrected.

Rectification under section 154 is limited to mistakes apparent from the record, meaning patent and self-evident errors that do not require debate or detailed reasoning. On that basis, the alleged exclusion of profit on sale of a fixed asset could not be corrected under section 154 because it involved application of the statutory scheme rather than an obvious record error, and the same approach applied to the claimed higher depreciation on software written down value, which depended on interpretation of earlier-year expenditure, depreciation and opening written down value. The ITAT Mumbai sustained the refusal to exercise rectification jurisdiction and rejected the assessee's challenge.

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Issues: (i) whether the alleged error in excluding profit on sale of fixed asset from the income computation could be rectified under section 154; (ii) whether non-grant of higher depreciation on software written down value could be rectified under section 154.

Issue (i): whether the alleged error in excluding profit on sale of fixed asset from the income computation could be rectified under section 154.

Analysis: Rectification under section 154 is confined to mistakes apparent from the record. A mistake must be patent, obvious and self-evident, and not one requiring argument, investigation, or a long drawn process of reasoning. The claim regarding treatment of profit on sale of fixed asset involved application of the statutory scheme and was not an obvious error on the face of the record.

Conclusion: The issue was not rectifiable under section 154 and was against the assessee.

Issue (ii): whether non-grant of higher depreciation on software written down value could be rectified under section 154.

Analysis: The claim for further depreciation depended on how the earlier year's software expenditure, depreciation allowance, and opening written down value were to be understood and applied. Such a claim was debatable and could not be treated as an apparent mistake capable of rectification under section 154.

Conclusion: The issue was not rectifiable under section 154 and was against the assessee.

Final Conclusion: The refusal to exercise rectification jurisdiction was sustained, and the assessee's challenge failed.

Ratio Decidendi: Rectification jurisdiction under section 154 extends only to obvious and patent mistakes apparent from the record, and not to matters requiring debate, interpretation, or a long drawn process of reasoning.

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