S. 145 : Method of accounting-Survey-Excess-stock-Surrender-Reflected in sales and closing stock-Accounting treatment is held to be proper-Investment in excess stocks to be taxed as part of business income and not as income from other sources. Proper-Accrual-Notional interest-Lower interest charged from wife of one of partners-Commercial expediency-Notional addition is not justified-Partners were paid interest at 12 Per Cent. and balance in partners’ account much more than amount advanced to wife of partner-Disallowance is to be restricted at 2 Per Cent.[S. 4, 5,,28(i), 69, 133A]