The European Commission (EC) decided to assess fiscal arrangements of certain multinational enterprises as well as national tax schemes that might be problematic from a State aid perspective under EU law. The underlying principle of these actions is to have these companies pay tax where they make their profits, so where the commercial value originates. The legal analytical framework under EU State aid law developed and applied by the EC to assess tax rulings and agreements with national tax authorities dealing with transfer pricing arrangements (i.e. pricing of intra-company transactions and dealings) that are used by multinational enterprises to manipulate internal prices in order to shift corporate profits to low-tax or no-tax jurisdictions was central to this research. More specifically, this research addressed the main research question: How should transfer pricing and rules on allocation of income to Permanent Establishments (PEs) applicable to multinational enterprises be assessed under European State aid law?