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This 2017 report sets out recommendations for branch mismatch rules that would bring the treatment of these structures into line with the treatment of hybrid mismatch arrangements as set out in the 2015 Report on Neutralising the Effects of Hybrids Mismatch Arrangements (Action 2 Report). Branch mismatches arise where the ordinary rules for allocating income and expenditure between the branch and head office result in a portion of the net income of the taxpayer escaping the charge to taxation in both the branch and residence jurisdiction. Unlike hybrid mismatches, which result from conflicts in the legal treatment of entities or instruments, branch mismatches are the result of differences in the way the branch and head office account for a payment made by or to the branch. The 2017 report identifies five basic types of branch mismatch arrangements that give rise to one of three types of mismatches: deduction / no inclusion (D/NI) outcomes, double deduction (DD) outcomes, and indirect deduction / no inclusion (indirect D/NI) outcomes. This report includes specific recommendations for improvements to domestic law intended to reduce the frequency of branch mismatches as well as targeted branch mismatch rules which adjust the tax consequences in either the residence or branch jurisdiction in order to neutralise the hybrid mismatch without disturbing any of the other tax, commercial or regulatory outcomes. The annexes of the report summarise the recommendations and set out a number of examples illustrating the intended operation of the recommended rules.

The mobility and fungibility of money makes it possible for multinational groups to achieve favourable tax results by adjusting the amount of debt in a group entity. The 2015 Report established a common approach which directly links an entity’s net interest deductions to its level of economic activity, based on taxable earnings before interest income and expense, depreciation and amortisation (EBITDA). This approach includes three elements: a fixed ratio rule based on a benchmark net interest/EBITDA ratio; a group ratio rule which allows an entity to deduct more interest expense based on the position of its worldwide group; and targeted rules to address specific risks. Further work on two aspects of the common approach was completed in 2016. The first addressed key elements of the design and operation of the group ratio rule, focusing on the calculation of net third party interest expense, the calculation of group-EBITDA and approaches to address the impact of entities with negative EBITDA. The second identifies features of the banking and insurance sectors which can constrain the ability of groups to engage in BEPS involving interest, together with limits on these constraints, and approaches to deal with risks posed by entities in these sectors where they remain.

This report sets out recommendations for domestic rules to neutralise the effect of hybrid mismatch arrangements and includes changes to the OECD Model Tax Convention to address such arrangements. Once translated into domestic law, the recommendations in Part 1 of the report will neutralise the effect of cross-border hybrid mismatch arrangements that produce multiple deductions for a single expense or a deduction in one jurisdiction with no corresponding taxation in the other jurisdiction. Part 1 of the report will be supplemented by a commentary, which will explain the recommended rules and illustrate their application with practical examples. Part 2 of the report sets out proposed changes to the Model Convention that will ensure the benefits of tax treaties are only granted to hybrid entities (including dual resident entities) in appropriate cases. Part 2 also considers the interaction between the OECD Model Convention and the domestic law recommendations in Part 1.