The 2025 Update to the OECD Model Tax Convention: Key Changes and Doctrinal Implications

Introduction

The 2025 Update to the OECD Model Tax Convention (MTC) reflects a series of targeted doctrinal clarifications rather than a wholesale structural revision. Taken together, the changes respond to longstanding interpretive uncertainties across three thematic pillars: the scope of permanent establishment in modern working arrangements and extractive industries; the interface between Article 9 transfer pricing principles and domestic interest limitation rules; and the procedural architecture surrounding dispute resolution and information exchange. This post offers a structured analysis of each change.

Article 25 Mutual Agreement Procedure and GATS Competent Authority Confirmation

The most structurally novel amendment is the introduction of a new paragraph 6 to Article 25, which formalises the role of competent authorities in determining whether a matter falls within the scope of a tax treaty for purposes of the dispute resolution mechanisms provided under the General Agreement on Trade in Services (GATS). This provision addresses a long-standing ambiguity at the intersection of tax treaty law and the WTO/GATS framework. Article XVII(4)(d) of GATS excludes from its non-discrimination disciplines measures that are "covered by" a tax agreement but whether a given measure is so covered requires a determination that has, until now, lacked a clear procedural home in the MTC. The new paragraph 6 fills this gap by assigning that competency to the treaty's competent authorities, anchoring the determination within the mutual agreement procedure framework.

Article 5 Commentary - Home Office as a Fixed Place of Business

The 2025 Update introduces changes to the Commentary on Article 5 that clarify the circumstances under which an individual's home could constitute a "place of business" of the enterprise for which the individual works and thereby give rise to a fixed place of business (FPOB) permanent establishment.

These changes are characterised by the OECD as an evolution of existing principles rather than a doctrinal departure, building on guidance that first emerged prominently in the context of pandemic-era working arrangements. The updated Commentary addresses the analytical framework that must be applied: whether the enterprise has required or habitually sanctioned the use of the home as a place of business, and whether it has a degree of control over or access to the home. Where an employee unilaterally chooses to work from home without any instruction, expectation, or material benefit to the enterprise, the home will generally not constitute a FPOB of the employer.

Article 5 Commentary - Extractive Industry Alternative Provision

A further set of changes to the Commentary on Article 5 introduces an alternative (optional) provision on activities in connection with the exploration and exploitation of extractable natural resources, together with related commentary. The centrepiece of this provision is a bilaterally negotiated, lower PE threshold: a non-resident enterprise that operates in a State for more than a bilaterally agreed time period would cross the threshold regardless of whether a fixed place of business exists in the conventional sense.

This optional provision reflects a longstanding policy preference of resource-rich, capital importing jurisdictions, to assert taxing rights over upstream activities without being constrained by the general Article 5 FPOB requirement. The UN Model Tax Convention has historically accommodated a broader PE concept for extractive activities, and this amendment narrows the practical divergence between the OECD and UN models in this sector.

Article 9 Commentary - Transfer Pricing and Interest Deductibility

The 2025 Update includes changes to the Commentary on Article 9 that respond to questions raised in the context of Working Party 6's work on the transfer pricing aspects of financial transactions. As codified in Chapter X of the Transfer Pricing Guidelines and that clarify the application of Article 9, especially as it relates to domestic laws on interest deductibility, such as those recommended in the final report on BEPS Action 4. Related changes to the Commentary on Article 7 and Article 24 accompany these clarifications.

The central issue addressed is the interaction between the arm's length principle under Article 9 and domestic interest limitation rules. BEPS Action 4 recommended the adoption of fixed ratio rules that cap interest deductions at a percentage of EBITDA, irrespective of whether the interest in question was set at arm's length. The question of whether such rules are compatible with Article 9 and whether a taxpayer could invoke the article to challenge a disallowance that goes beyond what an arm's length analysis would produce has been a source of controversy in both treaty practice and domestic litigation.

Article 25 Commentary Amount B and Dispute Resolution Optionality

Changes to the Commentary on Article 25 signal specific language relating to tax certainty and the elimination of double taxation included in the report on Amount B the simplified and streamlined approach to the arm's length pricing of baseline marketing and distribution activities. These changes are intended to ensure optionality is preserved in all dispute resolution mechanisms for non-adopting jurisdictions. Amount B, developed as part of the OECD/G20 Two-Pillar framework, represents an attempt to reduce compliance and administrative costs for lower-capacity jurisdictions by providing a fixed return for certain routine distribution functions. However, its adoption is optional, and the relationship between

Amount B outcomes and bilateral MAP proceedings particularly for jurisdictions that have not adopted it required clarification. By signposting Amount B within the Article 25 Commentary, the OECD anchors Amount B outcomes within the MAP framework while simultaneously ensuring that non-adopting jurisdictions do not inadvertently lose access to dispute resolution if a counterparty jurisdiction applies Amount B. The amendment thus serves a conflict-prevention function in an asymmetric adoption environment.

Article 26 Commentary Exchange of Information and Taxpayer Rights

The 2025 Update introduces two sets of changes to the Commentary on Article 26. The first expressly confirms that information received through exchange of information (EOI) may be used for tax matters concerning persons other than those in respect of whom the information was originally requested. This codifies a practice that has been implicit in OECD interpretive guidance but had not been expressly stated in the Commentary. The second set of changes reflects agreed interpretive guidance on two distinct issues: taxpayer access to exchanged information, and the disclosure of "reflective non-taxpayer specific" information about or generated on the basis of exchanged information.

How can we help?

MCORE LAW supports multinational enterprises in navigating the evolving international tax landscape shaped by the 2025 update to the OECD Model Tax Convention. The firm advises on permanent establishment risks arising from modern working arrangements and extractive industry operations, provides strategic guidance on the interaction between transfer pricing rules and domestic interest limitation regimes introduced under BEPS Action 4, and represents clients in complex cross-border tax disputes, including Mutual Agreement Procedures. MCORE LAW also assists clients in managing treaty interpretation issues involving Amount B, competent authority procedures, and exchange of information frameworks, ensuring that international structures remain compliant while effectively protecting against double taxation and regulatory uncertainty.