This report provides a comprehensive statistical analysis of tax return data, utilizing two datasets. Dataset 1, sourced from the Australian Taxation Office (ATO), explores the relationships between lodgement methods (agent vs. self-preparation), age groups, total income, and deduction amounts. The analysis includes frequency distributions, proportions, one-sample proportional Z-tests, correlation coefficients, and linear regression to uncover patterns and dependencies. Dataset 2, gathered through a survey, focuses on international students' preferences for lodgement methods. Comparative analyses between the two datasets are conducted using two-sample Z-tests to assess the equality of proportions. The report reveals insights into the factors influencing tax return lodgement choices and the relationships between various financial and demographic variables. The findings are presented with statistical summaries, confidence intervals, and visualizations, offering a detailed understanding of the data and its implications.