Article 63 of the GCC Common VAT Agreement establishes the principle of Member State sovereignty regarding the administration of VAT payments. This article delegates the authority to each individual Member State to define the specific rules and procedures for the settlement of VAT liabilities. It explicitly grants each state the power to determine the timeframes, conditions, and detailed provisions under which a Taxable Person must remit their Net Tax Due. This ensures that the practical aspects of tax collection, such as payment deadlines and methods, can be adapted to the domestic legal and financial infrastructure of each jurisdiction.