This study investigates the effect of corporate tax planning on the profitability of quoted firms in the Growth Board of the Nigerian Exchange Group. The study adopts a panel data research design, covering eight (8) quoted firms over a ten-year period from 2015 to 2024. Secondary data were obtained from the annual reports and accounts of the selected firms, focusing on income effective tax planning (IET), debt tax planning (DTS), and non-debt tax planning (NDT) as measures of corporate tax planning, while return on investment (ROI) was used as the indicator of financial performance. The study employs panel regression analysis, including pooled Ordinary Least Squares (Pooled OLS), Fixed Effects (FE), and Random Effects (RE) models, with the Hausman test used to determine the most appropriate model. Results from the Fixed Effects model reveal that income tax planning (IET), debt tax planning (DTS), and non-debt tax planning (NDT) all have a positive and statistically significant effect on ROI at 5% significance level. The Hausman test confirms the Fixed Effects model as the most suitable for interpretation. The findings indicate that strategic tax planning enhances firm profitability, highlighting the importance of efficient tax management in value creation for shareholders. The study concludes that corporate managers should implement systematic tax planning strategies to maximize financial performance while ensuring compliance with regulatory frameworks.