This study examines the association between the effective corporate tax rate and the volatility of future effective corporate tax rates in Korean companies. We analyzed the effect of corporate governance on the association between tax avoidance and tax risk. Our sample is comprised of all the firms listed on the Korea Composite Stock Price Index market. We measure each firm's tax avoidance as GAAP ETR, Cash ETR, and BTD, and use the corporate governance rating of the Korea Corporate Governance

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... ervice to measure corporate governance. Our results show that the volatility of the effective corporate tax rate and the effective corporate tax rate would have a significant negative association. Our results show that tax risk decreases when the corporate tax avoidance level increases and the tax risk increases when the corporate tax avoidance level decreases. In addition, we find that the better the corporate governance structure, the higher the level of supervision and control of managers, thereby mitigating the impact of tax evasion on future corporate tax risk. The findings of this study regarding tax avoidance and corporate governance are important for investors because tax risk can significantly affect investor welfare.