Gross residuary income rules define taxable receipts beyond primary income heads and address unexplained cash and assets.

Computation of gross residuary income captures receipts and accruals not covered by special sources or primary heads, including dividends (subject to specified exceptions), interest (excluding permitted financial institutions), insurance proceeds, receipts from employees' welfare funds if not business income, and income from letting movable assets when not business income. It also includes gratuitous receipts and specified property received without consideration (with enumerated exceptions), unexplained credits, unexplained investments, unexplained assets and expenditure where the assessee fails to satisfactorily explain sources, and certain cash-based receipts, withdrawals and repayments not made by account-payee instruments as governed by prescribed thresholds and conditions.

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