This research analyzes the impact of Financial Constraints, Income Shifting, and Sustainability Reporting on tax avoidance, with Institutional Ownership as a moderating variable. The sample consists of 34 manufacturing companies listed on the Indonesia Stock Exchange from 2021 to 2023, using purposive sampling methods. Data were analyzed using panel data regression with EViews 12. The results indicate that Income Shifting and Sustainability Reporting significantly affect Tax Avoidance, while Financial Constraints do not impact Tax Avoidance. Additionally, Institutional Ownership moderates the effect of Income Shifting on Tax Avoidance but does not moderate the effects of Financial Constraints and Sustainability Reporting on Tax Avoidance. This study meets classical assumption tests and found no issues with multicollinearity, heteroscedasticity, or autocorrelation. The findings highlight the importance of Institutional Ownership in monitoring tax avoidance and the need for transparency in sustainability reporting.