National Internal Revenue Code (NIRC)
Section 50. Allocation of Income and Deductions. - In the case of two or more organizations, trades or businesses (whether or not incorporated and whether or not organized in the Philippines) owned or controlled directly or indirectly by the same interests, the Commissioner is authorized to distribute, apportion or allocate gross income or deductions between or among such organization, trade or business, if he determined that such distribution, apportionment or allocation is necessary in order to prevent evasion of taxes or clearly to reflect the income of any such organization, trade or business.