“estimation of income”

When purchases are unproved or presumed to be from the grey market, the entire amount of such purchases should not be disallowed; instead, income can be estimated by applying a reasonable gross profit rate to the unaccounted sales or turnover, especially in assessments arising from search proceedings involving seized documents.

A provision for expenses, such as warranty, is a deductible liability for income tax purposes if it constitutes a present obligation arising from past events, and a reliable estimate of the amount of obligation is possible.

In cases of alleged bogus or unverifiable purchases, rather than disallowing the entire purchase value, a reasonable profit element or a proportionate percentage of the purchases should be added back to the assessee's income.

In a best judgment assessment, some guesswork is inherent, but the estimate must be fair and not arbitrary. Books of account can be rejected under Section 145(3) if the assessee fails to substantiate entries or prove the genuineness of transactions, leading to estimation of income.

If there is an unexplained cash credit, the Assessing Officer can treat it as the assessee's income, even when the income is finalized on an estimation basis, without proving its specific source. The onus then shifts to the assessee to prove that the income represented by the cash credit has already been taxed.

The Supreme Court established principles for best judgment assessments, stating that some guesswork is inevitable but the assessment must be bona fide, rational, and free from bias or capriciousness. An appellate authority cannot substitute its judgment for that of the Assessing Officer unless the AO's assessment is shown to be biased, irrational, vindictive, or capricious, especially when the assessee fails to provide proper accounts or counter-evidence.

When making an addition for unaccounted receipts, on-money, or non-genuine purchases/sales, the addition should be restricted to the estimated profit element embedded in such transactions, rather than the entire gross amount, particularly when evidence of corresponding expenditure is incomplete. This estimation often involves applying a net profit rate.

Penalty under section 271(1)(c) cannot be levied when an addition to income is made on an estimated basis without concrete evidence of concealment or furnishing inaccurate particulars of income. The provisions of section 271(1)(c) are not attracted to cases where income is assessed on an estimate basis.