This case study analyzes various aspects of Australian taxation law, including constitutional provisions for taxation, the role of different governmental bodies in tax-related matters, and the implications of Double Tax Avoidance Agreements (DTAA). The study examines scenarios involving business profits, capital gains tax on land sales, and the deductibility of interest on loans for investment purposes. It explores different alternatives for land development and their tax consequences, as well as the calculation of net capital gains and losses for individuals. The case study applies relevant sections of the Income Tax Assessment Act, 1997, and related legislation to provide tax advice and recommendations based on specific scenarios. It aims to clarify the tax treatment of different income types and deductions, offering a comprehensive overview of Australian tax law principles.