Article 11 mandates that all taxpayers, including those benefiting from exemptions, must submit an annual tax return using the Authority's prescribed form. The return must detail taxable income and the tax due. The Law allows taxpayers to submit amended returns to correct errors or omissions from previous years, subject to Authority approval and existing statutes of limitation. This self-assessment mechanism is a critical component of Qatar's tax compliance framework, ensuring that even exempt entities remain transparent and accountable to the General Tax Authority regarding their financial activities.