In this chapter, I assess the OECD’s Pillar One relative to (a) its original overarching objective of stabilizing the international tax system by providing for the fair and effective taxation of multinational platform firms and (b) the Ottawa Taxation Framework Conditions, a set of principles formulated approximately three decades ago that were, and are, intended to guide EU member states vis-à-vis tax policy as it relates to electronic commerce. (It bears noting that, while Pillar Two may address other shortcomings with the current international tax system, it does not mitigate any of the weaknesses in Pillar One described herein.) In brief, I conclude that Pillar One would not effectively stabilize the international tax system, and it would satisfy relatively few of the Ottawa Taxation Framework Conditions.