“Section 142(2)(a)”

For revision under Section 263, the Assessing Officer's order must be both erroneous and prejudicial to the interests of the revenue; if either condition is not met, the revisionary jurisdiction cannot be invoked. An order is not erroneous merely because the Assessing Officer did not record the details of enquiries conducted, provided due enquiries were made.

An appeal before the Income Tax Appellate Tribunal can be dismissed for non-prosecution or treated as unadmitted when the appellant fails to appear, cooperate, or show diligence, in accordance with Rule 19(2) of the Income-tax (Appellate Tribunal) Rules. The law aids the vigilant, not those who sleep on their rights.

An Assessing Officer cannot initiate reassessment proceedings under Section 147 of the Income Tax Act based on a mere change of opinion. Reassessment is permissible only when there is fresh tangible material leading to the belief of income escapement, not merely a review of existing facts.

Taxing statutes are presumed to operate prospectively unless a clear contrary intention for retrospective application is evident. The law applicable for determining tax liability is that which stands on the first day of the assessment year, following the principle that law looks forward, not backward (lex prospicit non respicit).

The Commissioner of Income Tax (Appeals) possesses co-terminus powers with the Assessing Officer and can direct the Assessing Officer to perform actions he failed to do, but cannot introduce a new source of income in the assessment. The appellate assessment must be confined to the items of income that were the subject matter of the original assessment.

When a notice under Section 148 of the Income Tax Act is issued, the Assessing Officer is bound to furnish reasons for reopening upon the assessee's request and must dispose of the assessee's objections to the notice by passing a speaking order.

Under Section 263, an assessment order is not erroneous and prejudicial to the interest of the revenue merely because the Principal Commissioner disagrees with the Assessing Officer's (AO) view, particularly if the AO has adopted one of two permissible views in law, unless that view is completely unsustainable. If due inquiries were made, the AO's order does not become erroneous solely because the fact of inquiries was not recorded.

For initiating reassessment proceedings under Section 147, the Assessing Officer needs only prima facie material providing a reason to believe that income has escaped assessment. Conclusive proof or the sufficiency/correctness of the material is not required at the stage of issuing the notice under Section 148.