S. 40(a)(ia): Amounts not deductible-Deduction at source-Books of Accounts rejected-Separate addition under 40(a)(ia) not valid. Disputed income under litigation-Shown as other income-Cannot be included in turnover when books are rejected-Income does not accrue until litigation is finally terminated, especially if liability is not admitted by the other party. [S. 4, 5, 144 145]