Courts and the Tax Authorities can look into the real purpose of the commercial arrangements and transactions to reach the truth and the transactions having the sole purpose of tax avoidance may be held to be having no effect on the actual tax liability of the tax payer. Book entries and Method of Accounting is not determinative and conclusive for deciding the computation of ‘taxable income’ in the hands of the Assessee though they may be relevant to be considered. “Diversion of income by transfer of overriding title at source” should normally have the support of the statutory requirements or some decretal binding character of Courts of law and even though the private contractual obligations can also bring about such “diversion of income at source” but in this last sphere of private contractual obligations, the Courts and the Income Tax Authorities have to examine such aspects carefully in comparison to the above two other categories of statutory requirements and the Court decrees and then examine the real purport and object of such private arrangements and Contracts