On 11 September 2024, Bulgaria's Council of Ministers approved a letter of intent to sign the Multilateral Convention to Facilitate the Implementation of the Pillar Two Subject to Tax Rule (STTR MLI). The STTR MLI has been designed to help developing countries protect their tax base and allows for the implementation of the STTR in existing bilateral tax treaties without the need for bilateral negotiations. It includes provisions to allow source jurisdictions to "tax back" where defined categories of intra-group covered income are subject to nominal corporate income tax rates below the STTR minimum rate of 9% and domestic taxing...