This study analyzed whether the level of tax avoidance of delisted firms differs from that of non-delisted firms. A decrease in the corporate sustainability of listed firms eventually leads to delisting. If the financial risk of firms increases, the incentive to avoid taxes will also increase. In this case, an extremely aggressive tax strategy might negatively impact sustainability and prove to be non-continuous. This induces the possibility of delisting. Accordingly, this study analyzed whether delisted firms perform more tax avoidance than non-delisted companies from the perspective of corporate sustainability. The results of this study are as follows. The results of analyzing whether the cash effective tax rate and effective tax rate, which are proxies of tax avoidance, are different reveal that the cash effective tax rate and effective tax rate of the delisted companies are significantly low. This suggests that delisted companies are receiving more incentives to avoid taxes. Additionally, this study also analyzed whether there is a difference in tax risk between delisted and non-delisted companies. The results reveal that the delisted companies have a significantly higher tax risk. This study contributes to the literature on the tax strategy of delisted companies. It also contributes to enhancing the understanding of corporate sustainability.

This study seeks to determine whether corporate sustainability increases due to the corporate name change strategy by analyzing the sample of IT companies listed on the KOSDAQ market from 2010 to 2019, through the event study methodology and OLS regression. This study has the following conclusions: first, the analysis results show that if the market response to an IT company’s corporate name change is positive, its financial constraint improves after the name change. Second, even if the companies’ financial constraint conditions before the corporate name change differ, their financial constraints improve after the name change if the market response to their announcements to change their corporate names is favorable. In other words, in terms of corporate sustainability, the financial constraint of a company improves depending on how it establishes the strategy to change its corporate name as well as the level of the market response to the announcement to change its corporate name. This implies that an IT company’s strategy to change its corporate name can affect corporate sustainability. Consequently, from the perspective of IT companies, this study serves as a guide for stakeholders’ decision-making processes and proves that the financial constraint can be improved through a corporate name change strategy.

This study analyzes whether a company’s competitive advantage affects a company’s tax avoidance strategy. Additionally, it analyzes whether these effects depend on the level of competition in the market to which the company belongs. This is because a company’s tax avoidance strategy may vary depending on the characteristics of the firm, such as the financial position and governance structure, the market dominance, or the degree of competition in the market to which the company belongs and it can act as an incentive for tax avoidance. Results of this study is follows. Tax avoidance increases significantly as a company’s market share increases. Also, if the sample is divided by the level of market competition and analyzed, the results show that tax avoidance increases significantly with the increase in a company’s market power only in oligopolistic markets with low market competition. Therefore, it can be interpreted that the effect of a company’s market power on tax avoidance varies depending on the level of competition in the market.