On 3 October 2023, the OECD adopted the "Multilateral Convention to Facilitate the Implementation of the Pillar Two Subject to Tax Rule" (STTR Multilateral Instrument). The Convention will allow to implement the Pillar Two Subject to Tax Rule in existing bilateral tax treaties without the need for bilateral negotiations. It will also allow developing countries to tax certain intra-group payments, in instances where these payments are subject to a nominal corporate income tax rate below 9%. The convention is now open for signing.
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