“Section 143(3)”

Appellate authorities can consider new claims and additional grounds if the relevant facts are already on record. The purpose of assessment is to correctly determine tax liability, allowing both parties to raise issues.

Delay in filing appeals, when supported by sufficient or justifiable cause, should be condoned with a liberal approach to ensure substantial justice. This principle prioritizes the cause of justice over mere technicalities.

In a search assessment under Section 153A, additions can only be made for completed or non-abated assessment years if incriminating material relevant to those years is found during the search, although notice under Section 153A(1) is mandatorily issued for six assessment years preceding the search.

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.

When two equally plausible interpretations of a taxing provision are possible, or when conflicting views exist from non-jurisdictional High Courts, the interpretation that favors the assessee must be adopted.

A penalty notice issued under section 274 read with section 271(1)(c) is invalid if it fails to specify whether the penalty proceedings are initiated for concealment of income or for furnishing inaccurate particulars of income. This non-specification vitiates the penalty proceedings.

An assessment under section 153A is without jurisdiction if there is an absence of incriminating material for an unabated assessment year.

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.