Penalty under section 15B(3) of the Wealth-tax Act follows guidance for section 140A(3) of Income-tax Act. Penalty under section 15B(3) of the Wealth-tax Act, 1957 shall be administered by applying the Board's Instruction No. 389 regarding levy of penalty under section 140A(3) of the Income-tax Act, 1961 mutatis mutandis, because the two provisions are similar in scope and nature, and officers are to be notified accordingly.