Article 40 of the GCC Common VAT Agreement establishes the fundamental principles for the obligation to pay tax. It primarily mandates that a Taxable Person is responsible for remitting the VAT due on their taxable supplies of goods and services. This payment must be made to the competent tax administration within the Member State where the place of supply is located. Furthermore, the article broadens this liability by stipulating that any person, regardless of their status as a Taxable Person, who issues an invoice explicitly stating a VAT amount, is also legally obligated to pay that specified amount to the relevant tax authority.