Article 8 stipulates that an entity's taxable income under the Qualified Domestic Minimum Top-Up Tax (QDMTT) framework is determined from its financial statements. This calculation must encompass all revenues and expenses, critically including transactions conducted with other members of the MNE group. The provision grants authority for executive regulations to establish the specific controls and conditions governing these calculations, particularly for inter-company transactions. This ensures that the income basis aligns with standardised accounting principles, subject to specific regulatory oversight to maintain the integrity of the tax base for GloBE purposes.