Article 51 of the GCC Common VAT Agreement establishes the framework for voluntary VAT registration. Clause 1 permits a resident Person, not legally required to register under the mandatory provisions of Article 50(1), to request registration if their annual supplies within a Member State equal or exceed the voluntary registration threshold. Furthermore, Clause 2 grants Member States the discretion to allow registration based on annual expenses exceeding this threshold, in accordance with local conditions. Clause 3 specifically sets the Voluntary Registration Threshold at 50% of the Mandatory Registration Threshold, enabling smaller businesses to register and manage their tax obligations effectively.