Block assessment estimates can rest on seized material and admissions when the figure has a rational nexus to evidence.

Undisclosed income in a block assessment may be estimated from seized material and a partner's sworn admission where the evidence shows systematic suppression of turnover. An estimate need not be mathematically exact, but it must bear a rational nexus to the record. Here, loose slips indicating day-to-day sales suppression and admissions of regular understatement supported the estimating authority's approach. The Tribunal's moderated use of a multiplier and gross profit rate, based on the seized material and surrounding circumstances, was found neither arbitrary nor conjectural. The estimation of undisclosed income was therefore upheld, and the assessee's challenge failed.

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Issues: Whether the estimate of undisclosed income in block assessment, based on seized material and partner's admission, was arbitrary or unsupported by evidence.

Analysis: Search proceedings yielded loose slips evidencing day-to-day suppression of sales for the relevant years, together with sworn admissions by a partner that the firm had been regularly suppressing turnover throughout the block period. The estimating authority was entitled to make a reasonable approximation from this material. The Court held that an estimate need not be exact, but it must have a rational nexus with the evidence on record. On the facts, the Tribunal reduced the Assessing Officer's estimate and adopted a moderated multiplier and gross profit rate on the basis of the seized material and surrounding circumstances. The Court found no arbitrariness, conjecture, or absence of material in this approach.

Conclusion: The estimation of undisclosed income was upheld and the assessee's challenge failed.

Ratio Decidendi: In block assessment, undisclosed income may be estimated on the basis of seized material and admissions if the estimate is made judicially and has a rational nexus with the evidence, even though precise quantification is not possible.

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